JP5290532B2 - POLYESTER RESIN AQUEOUS DISPERSION MIXTURE AND PROCESS FOR PRODUCING THE SAME - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To economically provide a polyester resin aqueous dispersion with good productivity which makes a resin film having a great adhesive force and a problem with blocking properties into a resin film having heat sensitive adhesion, blocking resistance, and easy releasability at the same time. <P>SOLUTION: The polyester resin aqueous dispersion comprises a polyester resin (A) having a melting point of 50-110&deg;C, a crystal fusion calorie of not less than 60 J/g, a crystallization temperature during cooling of not lower than 30&deg;C, and an acid value of 20-40 mgKOH/g and a polyester resin (B) composed of a polyester resin (b1) having a number average molecular weight of not smaller than 10,000, a melting point of lower than 50&deg;C, and an acid value of 2-12 mgKOH/g, a polyester resin (b2) having a number average molecular weight of not smaller than 10,000, no melting point, a glass transition point of not higher than 50&deg;C, and an acid value of 2-12 mgKOH/g, or a mixture thereof at a ratio (mass ratio) of (A)/(B) of 30/70 to 50/50. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention is an aqueous dispersion of a polyester resin containing two kinds of polyester resins in a specific ratio, particularly useful as an adhesive, having both heat sensitivity and blocking resistance, and having controlled adhesive force And a production method thereof, a polyester resin film formed product obtained therefrom, and a packaging bag using the film.

  Polyester resins are excellent in adhesion to various substrates, and are therefore used in large quantities as film-forming resins in the fields of adhesives and coating agents.

  In the said field | area, what melt | dissolved or disperse | distributed the polyester resin in the solvent is applied to a base material, and a film | membrane is formed. In particular, the adhesive is generally used by heating the film in the subsequent steps. In such applications, it is required that the coating softens quickly in response to the applied heat, and quickly solidifies upon cooling to exhibit cohesive force (adhesive strength) (heat-sensitive adhesiveness). At the same time, when winding a base material coated with such a polyester resin, or when layering it into sheets, it should not cause blocking (blocking resistance), and its blocking properties will be developed quickly. Is required. Furthermore, when it is used for a bag that is opened after bonding, an easy peelability that can be opened with an appropriate force is required.

  On the other hand, from the standpoint of environmental protection in recent years, resource saving, regulations on hazardous materials under the Fire Service Act, and workplace environment improvement, as a means to make polyester resin a coating solution, from conventional organic solvent solutions to “water-based” There is an active movement to replace “water dispersion”.

  An aqueous dispersion of a crystalline polyester resin, which has already been produced by dispersing a resin swollen in an organic solvent in an aqueous medium and further removing the organic solvent from the dispersion, is disclosed. (Patent Document 1).

Further, it is disclosed that an amorphous polyester resin having a specific acid value is made aqueous using an amphiphilic organic solvent and a basic compound (Patent Document 2). In addition, a high-molecular weight amorphous or low crystallinity polyester resin is used, and after phase inversion from an amphiphilic organic solvent, the organic solvent in the aqueous dispersion is removed to provide water with excellent storage stability. It has been found that a dispersion can be obtained (Patent Document 3).
JP 2005-281547 A JP-A-9-296100 International Publication No. 2004/037924 Pamphlet

  However, in Patent Document 1, the polyester resin used has insufficient crystallinity (heat of crystal melting) and has a long time from melting to solidification. The time to develop was long. In addition, sufficient blocking resistance was not obtained. Moreover, the polyester resin specifically used in Patent Documents 2 and 3 did not have a good balance of thermal adhesiveness, blocking resistance, and easy peelability.

  The present invention solves this problem, and provides a polyester resin aqueous dispersion that combines heat-sensitive adhesiveness, rapid blocking resistance expression, and easy peelability economically and with high productivity. It is in.

  As a result of intensive studies, the present inventors have found that a film obtained from an aqueous dispersion containing two specific types of polyester resins in a specific ratio solves the above problems, and has reached the present invention.

That is, the present invention
A polyester resin (A) having a melting point of 50 to 110 ° C., a heat of crystal melting of 60 J / g or more, a cooling crystallization temperature of 30 ° C. or more, and an acid value of 20 to 40 mgKOH / g; and a number average molecular weight of 10,000 or more, a melting point of less than 50 ° C. Polyester resin (b1) having an acid value of 2 to 12 mgKOH / g, or polyester resin (b2 ) having a number average molecular weight of 10,000 or more, no melting point, glass transition point of 50 ° C. or less, and acid value of 2 to 12 mgKOH / g or Ranaru polyester resin (B);
In a range of (A) / (B) = 30/70 to 50/50 (mass ratio).

  The present invention also relates to a film formed by coating the polyester resin aqueous dispersion and then removing the dispersion medium, and a packaging bag formed by thermally fusing the film.

  The present invention also relates to a method for producing the polyester resin aqueous dispersion, wherein the aqueous dispersion of the polyester resin (A) and the aqueous dispersion of the polyester resin (B) are mixed.

  According to the polyester aqueous dispersion of the present invention, a resin film exhibiting low-temperature adhesiveness and rapid blocking resistance can be formed. Therefore, it is suitable for an adhesive film as a binder component of a heat seal material, and after adhesion. Since the peel strength of the film is controlled, it is suitable for packaging bags that can be opened with an appropriate force.

  According to the production method of the present invention, a polyester resin having a relatively high molecular weight and crystallinity can be stably dispersed in water without introducing a strongly hydrophilic group such as sodium sulfonate or using an emulsifier. Therefore, there is no fear of water resistance deterioration due to the introduction of a hydrophilic group or an emulsifier.

  Since the aqueous dispersion of the present invention can reduce the amount of organic solvent, it is a material excellent from the standpoint of environmental protection and improvement of the work environment as a whole, and its industrial utility value is extremely high.

The polyester resin aqueous dispersion of the present invention is a liquid material in which at least a polyester resin (A) and a polyester resin (B) are contained and dispersed in a dispersion medium at a specific ratio.
<Polyester resin>
In the present invention, the polyester resin (A) has a melting point of 50 to 110 ° C, preferably 60 to 100 ° C. When the melting point is too low, it takes a relatively long time for the film-forming product obtained by drying the aqueous dispersion to exhibit blocking resistance. When the melting point is too high, a stable aqueous dispersion cannot be obtained when the polyester resin is mainly composed of an aliphatic component, and when the polyester resin is mainly composed of an aromatic component, a stable aqueous dispersion is not obtained. The composition for obtaining a low crystallinity is unfavorable because the crystallinity is low and it takes a relatively long time to develop the blocking resistance of the product obtained by drying.

  The polyester resin (A) has a heat of crystal melting of 60 J / g or more, preferably 62 to 120 J / g, and a cooling crystallization temperature of 30 ° C. or more, preferably 30 to 60 ° C. When the amount of heat of crystal melting is too small or when the temperature-falling crystallization temperature is too low, it is not preferable because it takes a relatively long time to develop the blocking resistance of the product obtained by drying the aqueous dispersion.

  The acid value of the polyester resin (A) is 20 to 40 mgKOH / g, preferably 22 to 32 mgKOH / g. If the acid value is too low, a stable aqueous dispersion may not be obtained. If the acid value is too high, the cohesive strength of the resin film formed by drying from the aqueous polyester resin dispersion may be reduced.

  The number average molecular weight of the polyester resin (A) is preferably 5,000 or more, and more preferably 7,000 to 15,000. When the number average molecular weight is less than 5,000, the cohesive force of the dried film forming product may be reduced. The molecular weight distribution is not particularly limited.

  The glass transition point of a polyester resin (A) is not specifically limited, Usually, it is -20 degrees C or less, for example.

  In the present specification, the values measured by DSC (differential scanning calorimetry) analysis are used in accordance with JIS K7121 for the melting point, the heat of crystal melting, the temperature drop crystallization temperature, and the glass transition point, which are thermal characteristics of the resin.

  The number average molecular weight is a value measured by GPC (gel permeation chromatography, effluent: tetrahydrofuran, polystyrene conversion).

  By using the polyester resin (A) as described above, the blocking resistance can be improved. Particularly, the blocking resistance is rapidly developed after the film is dried during the film formation. Moreover, easy peelability can also be provided.

  In the present invention, the polyester resin (B) has a melting point of less than 50 ° C., preferably 30 to 48 ° C., or a polyester resin (b1) having no melting point, and has a glass transition point of 50 ° C. or less, preferably −25 to 30. It is a polyester resin (b2) of ° C. The polyester resin (B) may be a mixture of the polyester resin (b1) and the polyester resin (b2). If the melting point of the polyester resin (b1) or the glass transition point of the polyester resin (b2) is too high, the adhesiveness is lowered.

  The polyester resin (b1) preferably has a heat of crystal melting of 0.3 to 20 J / g, more preferably 5 to 10 J / g, from the viewpoint of expression of adhesive strength.

  The glass transition point of the polyester resin (b1) is not particularly limited, and is usually −30 to −10 ° C., for example.

  With respect to the polyester resin (b2), “having no melting point” means that no endothermic peak is shown during temperature rise measurement in DSC (differential scanning calorimetry) analysis.

  Specifically, when the polyester resin (b2) is measured for temperature rise from −30 ° C. to 200 ° C. at a rate of 20 ° C./min with a DSC (Differential Scanning Calorie) measuring device (DSC7 manufactured by PerkinElmer), no endothermic peak appears. . In addition, a peak shall point out the vertex when the inclination of a tangent differs before and behind that.

  The acid value of the polyester resin (b1) and the polyester resin (b2) usually has 2 to 12 mgKOH / g, and is preferably 4 to 10 mgKOH / g, particularly 5 to 8 mgKOH / g from the viewpoint of the cohesive strength of the resin. It is particularly preferred that Hereinafter, when including and indicating both the polyester resin (b1) and the polyester resin (b2), the polyester resin (B) is simply indicated.

  The number average molecular weight of the polyester resin (B) is preferably 10,000 or more, and more preferably 12,000 to 25,000. When the number average molecular weight is less than 10,000, the adhesive strength of the dried film formed product may be lowered. The molecular weight distribution is not particularly limited.

  By using the polyester resin (B) as described above, the cohesive force of the film increases, and as a result, the adhesive force through the film improves.

  The mass ratio of the polyester resin (A) and the polyester resin (B) is in the range of 30/70 to 50/50 in the ratio of (A) / (B). When the ratio of the polyester resin (A) is less than 30%, the adhesive strength is large. When the packaging bag is opened, it cannot be easily peeled off, and when it exceeds 50%, the adhesive strength tends to be too low.

  Polyester resins (A) and (B) are both polycondensed with one or more polybasic acid components and one or more polyhydric alcohol components, or depolymerized with polybasic acid components after polycondensation, Moreover, it can manufacture by a well-known method, such as adding an acid anhydride after polycondensation. At this time, by adjusting the polybasic acid component and / or the polyhydric alcohol component and various conditions, the melting point of the resin, the heat of crystal melting, the temperature at which the crystallization temperature falls, the glass transition point, the number average molecular weight and the acid value are controlled. Is possible.

  For example, as will be described in detail later, when an aromatic dicarboxylic acid or an aliphatic dicarboxylic acid is used as the acid component, increasing the proportion of the aliphatic dicarboxylic acid in the acid component increases the amount of heat of crystal melting, and the glass The transition point is lowered. When the proportion of the aliphatic dicarboxylic acid is reduced, the heat of crystal melting is lowered and the glass transition point is raised.

  For example, when terephthalic acid (TPA) and isophthalic acid (IPA) are used in combination as the acid component, the amount of heat of fusion increases when the amount of TPA is small and the amount of IPA is small. When TPA is decreased and IPA is increased, the heat of fusion becomes lower. When TPA is increased and IPA is decreased, the melting point and heat of fusion increase. For example, if TPA is increased and IPA is increased, the melting point becomes higher.

  Further, for example, in the case where an aliphatic glycol is used as the alcohol component, when the proportion of the aliphatic glycol, particularly 1,4-butanediol, is increased, the heat of crystal melting of the resin increases. Decreasing the proportion of aliphatic glycol, especially 1,4-butanediol, reduces the heat of crystal melting of the resin.

  In addition, for example, when succinic acid and sebacic acid are used as the acid component and 1,4-butanediol is used as the glycol component, when succinic acid is copolymerized with succinic acid, the melting point and the cooling crystallization temperature are lowered.

  For example, when the usage-amount of the polybasic acid component for depolymerization is increased, the number average molecular weight of resin will become small and an acid value will become high. When the amount of the polybasic acid component is decreased, the number average molecular weight of the resin is increased and the acid value is decreased. At this time, when a polybasic acid component having three or more functional groups is used, the increase in acid value becomes more significant than when a bifunctional one is used.

  The polybasic acid component and polyhydric alcohol component that can be used in the production of the polyester resins (A) and (B), and preferred components and resin compositions will be described below. In addition, those descriptions are applicable as a common description of the polyester resins (A) and (B) unless otherwise specified.

  Examples of the polybasic acid include aliphatic polybasic acids, aromatic polybasic acids, and alicyclic polybasic acids. In specific compounds, examples of the aliphatic polybasic acid include saturated aliphatic acids such as oxalic acid, (anhydrous) succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanedioic acid, aicosane diacid, and hydrogenated dimer acid. Dicarboxylic acid: Unsaturated aliphatic dicarboxylic acid such as fumaric acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, citraconic acid, citraconic anhydride, and dimer acid. Examples of the aromatic polybasic acid include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, phthalic acid, naphthalenedicarboxylic acid, and biphenyldicarboxylic acid. Examples of the alicyclic polybasic acid include 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 2,5-norbornene dicarboxylic acid, and anhydrous 2,5-norbornene dicarboxylic acid. Examples thereof include alicyclic dicarboxylic acids such as acid, tetrahydrophthalic acid, and tetrahydrophthalic anhydride.

  As the polybasic acid constituting the polyester resin (A), among the polybasic acids described above, it is preferable to use an aliphatic polybasic acid, particularly an aliphatic dicarboxylic acid. The proportion of the aliphatic polybasic acid in the total acid component constituting the polyester resin (A) is preferably 60 mol% or more in order to improve the crystallinity of the formed film, and is 75 mol% or more. It is more preferable that

  As the polybasic acid constituting the polyester resin (B), it is preferable to use an aromatic polybasic acid among the polybasic acids described above. The proportion of the aromatic polybasic acid in the total acid component constituting the polyester resin (B) is 40 mol% or more in order to improve the cohesive strength of the resin and the adhesive strength to a substrate such as a polyester film. Preferably, it is more preferably 60 mol% or more.

  Examples of the polyhydric alcohol include aliphatic glycols, alicyclic glycols, ether bond-containing glycols, and the like. In a specific compound, as the aliphatic glycol, for example, ethylene glycol, 1,2-propylene glycol, 1,3-propanediol, 1,4-butanediol, 2-methyl-1,3-propanediol, 1, Examples include 5-pentanediol, neopentyl glycol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 1,9-nonanediol, and 2-ethyl-2-butylpropanediol. Examples of the alicyclic glycol include 1,4-cyclohexanedimethanol. Examples of the ether bond-containing glycol include diethylene glycol, triethylene glycol, dipropylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and 1 to several ethylene oxides or propylene oxides in two phenolic hydroxyl groups of bisphenols. Glycols obtained by mole addition, such as 2,2-bis (4-hydroxyethoxyphenyl) propane, can be mentioned.

  As the polyhydric alcohol constituting the polyester resin (A), among the polyhydric alcohols described above, aliphatic glycols, particularly ethylene glycol and 1,4-butanediol are preferably used in terms of improving crystallinity. The proportion of the aliphatic glycol in the total alcohol component constituting the polyester resin (A) is preferably 80 mol% or more, and more preferably 90 mol% or more.

  As the polyhydric alcohol constituting the polyester resin (B), among the polyhydric alcohols described above, aliphatic glycols are preferable for improving the adhesive force to the substrate. In particular, among aliphatic glycols, 1,4-butanediol is used as the polyhydric alcohol constituting the polyester resin (b1), and ethylene glycol and neopentyl are used as the polyhydric alcohol constituting the polyester resin (b2). Glycol is preferred. The proportion of the aliphatic glycol in the total alcohol components constituting the polyester resin (B) is preferably 80 mol% or more, and more preferably 90 mol% or more.

  As a part of the polybasic acid or polyhydric alcohol constituting the polyester resin (A) and / or polyester resin (B), a tribasic or higher polybasic acid or polyhydric alcohol may be used. Examples of the tribasic or more polybasic acid include trimellitic acid, trimellitic anhydride, pyromellitic acid, pyromellitic anhydride, benzophenone tetracarboxylic acid, benzophenone tetracarboxylic anhydride, trimesic acid, ethylene glycol bis (anhydro) Trimellitate), glycerol tris (anhydro trimellitate), 1,2,3,4-butanetetracarboxylic acid and the like. Examples of the trifunctional or higher functional polyhydric alcohol include glycerin, trimethylolethane, trimethylolpropane, and pentaerythritol. However, the polybasic acid or polyhydric alcohol having a functionality of 3 or more should be used within the range of 10 mol% or less, further 5 mol% or less with respect to the total acid component or total alcohol component constituting the polyester resin. Is preferable in order not to impair the high workability of the formed film.

  Hydroxycarboxylic acid such as γ-butyrolactone, ε-caprolactone, lactic acid, β-hydroxybutyric acid, ethylene oxide adduct of p-hydroxybenzoic acid is used as a component of the polyester resin (A) and / or polyester resin (B). May be.

The polyester resin (A) contains at least an aliphatic polybasic acid (particularly an aliphatic dicarboxylic acid) and an aliphatic glycol as monomer components from the viewpoint of expressing thermal characteristics such as the above-described heat of crystal melting and temperature-falling crystallization temperature. It is preferable to do. From such a viewpoint, a more preferable combination of “aliphatic polybasic acid-aliphatic glycol” is shown below.
(AC1) dodecanedioic acid-ethylene glycol;
(AC2) sebacic acid-1,4-butanediol;
(AC3) Sebacic acid and succinic acid-1,4-butanediol.

  The combination (AC1) is most preferable from the viewpoint of more rapidly developing the blocking resistance after the film is dried at the time of film formation.

  In such a preferable combination of the monomer components of the polyester resin (A), the content ratio of the aliphatic polybasic acid and the aliphatic glycol is the ratio of the aliphatic polybasic acid and the aliphatic glycol of the polyester resin (A), respectively. As long as it is within the range.

The polyester resin (B) preferably contains at least an aromatic polybasic acid and an aliphatic glycol as monomer components from the viewpoints of adhesion to the substrate and cohesive strength. At this time, an aliphatic polybasic acid may be contained if desired. From such a viewpoint, a more preferable combination of “aromatic polybasic acid-aliphatic polybasic acid-aliphatic glycol” is shown below.
(BC1) terephthalic acid and isophthalic acid-sebacic acid-1,4-butanediol;
(BC2) terephthalic acid and isophthalic acid-sebacic acid-ethylene glycol and neopentyl glycol.

  In such a preferable combination of monomer components of the polyester resin (B), the content ratios of the aromatic polybasic acid and the aliphatic glycol are the ratios of the aromatic polybasic acid and the aliphatic glycol of the polyester resin (B), respectively. As long as it is within the range. The content of the aliphatic polybasic acid is preferably 60 mol% or less, more preferably 40 mol% or less, based on the total acid components constituting the polyester resin (B).

The content of the polyester resin in the aqueous polyester resin dispersion of the present invention is appropriately selected depending on the intended use, the thickness of the target film, and the method of forming the film, but is usually 1 to 50% by mass. 5 to 40% by mass is preferable. When it exceeds 50 mass%, the storage stability of the polyester resin aqueous dispersion may deteriorate. On the other hand, if it is less than 1% by mass, a uniform film may not be formed. The content rate of the said polyester resin is a total content rate of a polyester resin (A) and a polyester resin (B).
<Basic compound>
The polyester resin (A) and / or the polyester resin (B) has a carboxyl group, and a part or all of the carboxyl group is neutralized with a basic compound in the aqueous dispersion. As a result, a carboxyl anion is generated, and the polyester resin fine particles are stably dispersed without agglomeration due to the electric repulsive force between the anions. Therefore, a polyester resin aqueous dispersion having good dispersion stability without using a surfactant. Is obtained.

  The basic compound causes a neutralization reaction with the carboxyl group in the polyester resin, and promotes aqueous formation. If the basic compound remains in the film-forming product, its performance tends to be lowered. Therefore, the basic compound in the present invention is preferably a compound that is easily volatilized by drying. Examples of such basic compounds include ammonia and organic amine compounds. The boiling point of the organic amine compound is preferably 160 ° C. or lower. Further, those which can be azeotroped with water are particularly preferred. Of these, ammonia and triethylamine are most preferable. The basic compound can be used as a single substance or as a mixture of plural substances.

The basic compound is used according to the amount of the carboxyl group contained in the polyester resin, and may be at least an amount capable of partially neutralizing this, and is 0.6 to 15 times equivalent to the carboxyl group. Is preferable, and 0.8 to 6 times equivalent is more preferable. If it is less than 0.6 times equivalent, the effect of adding a basic compound may not be recognized. On the other hand, if it exceeds 15 times equivalent, the storage stability of the polyester resin aqueous dispersion may be deteriorated.
<Method for producing aqueous dispersion>
The polyester resin aqueous dispersion of the present invention may be a water dispersion after mixing the polyester resin (A) and the polyester resin (B). However, after both are separately made into an aqueous dispersion, they are mixed and stirred at a predetermined ratio. This makes it possible to draw out the characteristics of both components sufficiently and is easy to manufacture. That is, it is preferable to mix the aqueous dispersion of the polyester resin (A) and the aqueous dispersion of the polyester resin (B).

The method for producing an aqueous dispersion of the polyester resin (A) of the present invention is exemplified, that is, a stable aqueous dispersion can be obtained through the following steps. A step of charging the polyester resin (A) into an amphiphilic organic solvent and heating to obtain a solution (step 1), a step of mixing the solution, the basic compound and water in the heated state to obtain an emulsion ( Step 2) is a method including a step (Step 3) of distilling off the organic solvent from the emulsion.
(Process 1)
A solution is obtained by dissolving the polyester resin (A) in an amphiphilic organic solvent. The amphiphilic organic solvent is hydrophilic and itself has an azeotropic action with water, and preferably has a boiling point of 150 ° C. or lower selected from alcohol, ketone, ether and glycol derivatives. It preferably has a boiling point of 110 ° C. or lower.

  Examples of the amphiphilic organic solvent that can be used in the present invention include methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, and the like. Examples of ketones include acetone, methyl ethyl ketone, and methyl isobutyl ketone. Examples of glycol derivatives include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, and propylene. Examples include glycol monopropyl ether and propylene glycol monobutyl ether. Examples of the cyclic ether include tetrahydrofuran and dioxane. These may be used alone or in combination.

The method for dissolving the polyester resin (A) in the above-mentioned amphiphilic organic solvent is not particularly limited, and a normal method such as heating or stirring as appropriate may be used.
(Process 2)
Next, phase inversion emulsification is performed by mixing the amphiphilic organic solvent solution of the polyester resin (A), water, and the basic compound. At this time, the order of mixing is not particularly limited. For example, the solution may be stirred, and a mixed solution of water and a basic compound may be added little by little, or after the basic compound is added. Water may be added.
(Process 3)
After emulsification, the amphiphilic organic solvent is distilled off from the viewpoint of the storage stability of the aqueous dispersion. The amphiphilic organic solvent can be distilled out of the system by azeotroping with water. The degree of distillation may be appropriately determined from the viewpoint of desired performance and stability, but the amphiphilic organic solvent should be distilled to 0.5% by mass or less of the entire polyester resin (A) aqueous dispersion. Can do. The organic solvent content can be quantified by gas chromatography.

  In this invention, it is preferable to carry out in the temperature range of 40 degreeC-(boiling point of an amphiphilic organic solvent) through the process 1-2, and an especially preferable temperature range is 50 degreeC-150 degreeC. If it is lower than 40 ° C., it may be difficult to keep the polyester resin (A) in a dissolved state, and the viscosity of the solution may be significantly increased. Further, when the boiling point of the amphiphilic organic solvent is exceeded, the scattering of the amphiphilic organic solvent becomes remarkable and may not be preferable.

  The temperature condition in step 3 is not particularly limited, but it is preferably set to a temperature equal to or higher than the temperature at which the amphiphilic organic solvent and water azeotrope. If the removal of the amphiphilic organic solvent proceeds, the system eventually reaches the boiling point of water. At this time, when a high temperature is not preferable for the polyester resin (A), the boiling point may be lowered by performing under reduced pressure. After the completion of step 3, it is preferable to quickly cool to 40 ° C. or lower.

  In Step 2, it is preferable to carry out Step 3 immediately after adding a basic compound and water to a solution of an amphiphilic organic solvent to carry out phase inversion emulsification, thereby distilling off the organic solvent. This is because the aqueous dispersion is not stable in a system containing an amphiphilic organic solvent after phase inversion, and it can be produced with stable quality in a relatively simple process without using special equipment. Furthermore, if the steps 1 and 2 are performed under the conditions of 40 ° C. to (boiling point of the amphiphilic organic solvent) as described above, the time required for the steps can be shortened immediately after performing the steps 3 and 3. This is advantageous in terms of energy saving.

  In order to carry out each of the above steps, no special equipment is required. It is only necessary to have a condenser equipped with a tank capable of introducing a liquid, capable of adequately stirring the mixture of the dispersion medium and the resin powder or the granular material charged in the tank, and capable of aggregating the vapor to be distilled, preferably 40 An apparatus that can be heated to a temperature between 0 ° C. and (the boiling point of the amphiphilic organic solvent or the boiling point of water, whichever is higher) is preferable.

  The method for producing the aqueous dispersion of the polyester resin (B) of the present invention is not particularly limited. For example, the polyester resin (B) having an acid value of 2 to 12 mgKOH / g is dissolved in an amphiphilic organic solvent, An aqueous dispersion in which the dispersion state is stable by dispersing this solution in water together with a basic compound, and then distilling off the organic amphiphilic organic solvent together with water, as in the case of the aqueous dispersion of the polyester resin (A). Can be manufactured.

  In the production process of the aqueous dispersion of the polyester resins (A) and (B), filtration or the like may be performed as necessary for the purpose of preventing the coarse particles from being mixed into the aqueous dispersion. For example, a stainless steel filter of about 300 to 600 mesh may be used. Further, pressure filtration may be performed at an air pressure of about 0.2 MPa.

  The dispersion medium in which the polyester resins (A) and (B) are dispersed is an aqueous medium and is a medium composed of a liquid containing water as a main component, and may contain the above-described organic solvent.

  The content of the organic solvent in the aqueous polyester resin dispersion of the present invention is not particularly limited as long as the aqueous polyester resin dispersion is stabilized. It is preferable that In addition, for the purpose of suppressing generation of repellency and bubbles during coating, an organic solvent may be added within a range that does not adversely affect performance. Moreover, after distilling a dispersion medium more than desired solid content concentration, you may dilute with water and adjust solid content concentration.

In the present invention, when the organic amphiphilic organic solvent is distilled off, the pH may be lowered to around 6. The pH of the aqueous polyester resin dispersion is preferably 6.6 or more. It is preferable to adjust the pH by adding a basic compound to the polyester resin aqueous dispersion after Step 3 of the production method. It is more preferable that the pH is 8.5 or more because the generation of bacteria and sputum is suppressed. When the pH of the aqueous dispersion is less than 6.6, the aqueous dispersion tends to solidify and the antibacterial effect is small. On the other hand, the upper limit of the pH is not particularly limited, but when it is larger than 12.0, the molecular weight of the polyester resin may be lowered over time, and is preferably 12.0 or less. As the basic compound for adjusting the pH, ammonia and amine used in Step 2 are used.
<Characteristics of water dispersion>
The viscosity of the aqueous dispersion of the present invention is not particularly limited. For example, in the case of application to a base material, the viscosity is preferably in the range of 1 to 100 mPa · s. Further, the volume average particle diameter of the aqueous dispersion is not particularly limited, but is preferably 400 nm or less because it is stable, and more preferably 300 nm or less.
<Usage of water dispersion>
After the aqueous dispersion of the present invention is coated on the substrate surface, the dispersion medium (aqueous medium) is removed to form a uniform film in close contact with the substrate surface. Specifically, since the aqueous dispersion of the present invention is excellent in film forming ability, it can be applied to various substrate surfaces by a known film forming method such as a dipping method, a brush coating method, a spray coating method, or a curtain flow coating method. A uniform resin film can be formed in close contact with various substrate surfaces by coating uniformly, setting as necessary near room temperature, and then subjecting to heat treatment for drying or drying and baking. As a heating device at this time, a normal hot air circulation type oven, an infrared heater, or the like may be used. The heating temperature and the heating time are appropriately selected depending on the properties of the substrate to be coated, etc. In consideration of economy, the heating temperature is preferably 30 to 250 ° C., 90 ˜160 ° C. is particularly preferred, and the heating time is preferably 1 second to 20 minutes, particularly preferably 10 seconds to 5 minutes.

  When the resin film is formed using the aqueous dispersion of the present invention, the thickness is appropriately selected depending on the application, but is usually 0.01 to 100 μm, preferably 0.1 to 50 μm, most preferably 0.5 to 25 μm. If the film is formed so that the thickness of the resin film falls within the above range, a resin film having excellent uniformity can be obtained. In order to adjust the thickness of the resin film, in addition to appropriately selecting an apparatus used for coating and its use conditions, it is necessary to use an aqueous dispersion having a concentration suitable for the desired thickness of the resin film. preferable.

  The present invention will be specifically described by way of examples.

Various characteristics were measured or evaluated by the following methods.
(1) Acid value of polyester resin 0.5 g of polyester resin was dissolved in 50 ml of water / dioxane = 1/9 (volume ratio), titrated with KOH using cresol red as an indicator, and the KOH consumed for neutralization. A value obtained by converting the number of mg per 1 g of the polyester resin was determined as an acid value.
(2) Number average molecular weight of polyester resin The number average molecular weight is determined by GPC analysis (using liquid feeding unit LC-10ADvp type and UV-visible spectrophotometer SPD-6AV type manufactured by Shimadzu Corporation, solvent: tetrahydrofuran, polystyrene conversion). Asked.
(3) Melting point, heat of fusion, crystallization temperature, glass transition point of polyester resin 10 mg of polyester resin is used as a sample, and the speed is -30 ° C to 20 using a DSC (Differential Scanning Calorie) measuring device (DSC7 manufactured by Perkin Elmer). The temperature rise measurement was carried out at 200 ° C./minute, kept at 200 ° C. for 3 minutes, and then the temperature fall measurement was carried out at a rate of 20 ° C./minute to −40 ° C. Among the peaks derived from the crystals obtained at this time, the peak top temperature (melting peak temperature Tpm defined in JIS K 7121) at the time of temperature rise measurement is taken as the melting point, the endotherm at this time is taken as the heat of fusion, and the temperature drop measurement The peak top temperature at the time (crystallization peak temperature Tpc defined in JIS K 7121) was defined as the crystallization temperature. In addition, the same measurement was performed, and the temperature of the rise of the displacement toward the endothermic side developed in the process of raising the temperature from −30 ° C. to 200 ° C. at a rate of 20 ° C./min (extrapolated glass transition start temperature defined in JIS K 7121). Tig) was taken as the glass transition point.
(4) Solid content concentration of polyester resin aqueous dispersion 1 g of the polyester dispersion was weighed and heated at 150 ° C. until the mass of the residue (solid content) reached a constant weight to obtain the polyester resin solid content concentration.
(5) Viscosity of polyester resin aqueous dispersion The rotational viscosity of the aqueous dispersion at a temperature of 30 ° C was measured using a DVL-BII type digital viscometer (B type viscometer) manufactured by Tokimec Corporation.
(6) Content of organic solvent in polyester resin aqueous dispersion Shimadzu Corporation gas chromatograph GC-8A [FID detector used, carrier gas: nitrogen, column packing material (manufactured by GL Sciences): PEG-HT ( 5%)-Uniport HP (60/80 mesh), column size: diameter 3 mm × 3 m, sample charging temperature (injection temperature): 150 ° C., column temperature: 60 ° C., internal standard: n-butanol] A dispersion or an aqueous dispersion diluted with water was directly charged into the apparatus, and the content of the organic solvent was determined. The detection limit was 0.01% by mass.
(7) pH of polyester resin aqueous dispersion
It was measured at 25 ° C. using a glass electrode type hydrogen concentration meter manufactured by HORIBA, Ltd. and pH METER F-21.
(8) Average particle diameter of polyester resin particle The volume average particle diameter was calculated | required using the Nikkiso Co., Ltd. make and micro track particle size distribution analyzer UPA150 (MODEL No. 9340).
(9) Thickness of Resin Film Using a thickness gauge (Union Tool, MICROFINE Σ), the thickness of the substrate (in the examples, polyester (PET) film (Unitika, thickness 38 μm)) is measured in advance. In addition, after forming the resin film on the base material using the aqueous dispersion, the thickness of the base material having this resin film was measured by the same method, and the difference was taken as the thickness of the resin film.
(10) Tack extinction time A PET film (Unitika Ltd., thickness 38 μm) is coated with an aqueous dispersion using a tabletop type coating device (Yasuda Seiki, film applicator No. 542-AB type, Meyer bar attached). Then, after drying for 1 minute in a 120 ° C. hot air oven to form a 5 μm thick resin film, take it to a room temperature of 23 ° C. and stack the PET film so that the coated surface is in contact until the tack disappears The time (seconds) was measured. 16 seconds or less was determined to be a practically acceptable range, and 10 seconds or less was determined to be a preferable range. Tack is tacky, and it was determined that the tack disappeared when the laminated PET film did not adhere even when a pressure of 50 KPa was applied. The case where the tack did not disappear in 1 hour was defined as “does not disappear”.
(11) Evaluation of blocking resistance After forming a resin film in the same manner as in (10) and leaving it to stand at room temperature of 23 ° C. for 1 day, the coating surface is overlapped so as to come into contact, and a pressure of 50 KPa is applied to 45 ° C. And left for 7 days. after that,
Using a tensile tester (Intesco Precision Universal Material Testing Machine 2020, manufactured by Intesco Corporation), the peel strength at an peel angle of 90 degrees, a peel speed of 50 mm / min, and a peel width of 25 mm was measured in an atmosphere at 20 ° C. It was determined that 0.1 N / 25 mm or less was within a practically acceptable range, and 0.05 N / 25 mm or less was a preferable range.
(12) Peel test After the resin film was formed in the same manner as in (10), it was piled up so that the coated surface and the coated surface were in contact with each other, and pressed with a heat press machine at 120 ° C, seal pressure 0.2 MPa, 10 seconds. did. The peel strength of this sample was measured in the same manner as (11). Under the above bonding conditions, an adhesive range of 0.3 to 4.0 N / 25 mm was determined as easy peelability.
(13) Dispersed state When stored in an environment of 5 ° C., a product that does not cause precipitation, layer separation, or solidification even after 1 month or more was recognized as “stable”. One month later, any precipitate, layer separation or solidification was identified as “unstable”.
[Examples of polyester resin production]
(Production example of polyester resin “P-1”)
Take 253.6 g of dodecanedioic acid, 95.2 g of ethylene glycol, 0.7 g of trimethylolpropane, and 0.11 g of tetra-n-butyl titanate in a heat-resistant pressure glass container equipped with a stirrer and heat at 235 ° C. for 3 hours. The esterification reaction was performed. The system pressure was then gradually reduced to 13 Pa after 1 hour. Three hours later, the system was brought to atmospheric pressure with nitrogen gas, 10.4 g of trimellitic anhydride was added, and the mixture was stirred for 1.5 hours to perform a depolymerization reaction to obtain a polyester resin “P-1”.
(Production example of polyester resins “P-2” to “P-5”)
Polyester resins “P-2” to “P-5” were obtained using the same method as the production method of the polyester resin “P-1” except that the raw material compositions prepared in Table 1 were used.
(Production example of polyester resin “P-6”)
78.6 g of terephthalic acid, 143.7 g of sebacic acid, 153.4 g of 1,4-butanediol, and 0.12 g of tetra-n-butyl titanate are placed in a heat-resistant pressure glass container equipped with a stirrer and heated at 220 ° C. for 3 hours. The esterification reaction was performed by heating. Next, the temperature of the system was raised to 230 ° C., and the pressure of the system was gradually reduced to 13 Pa after 1 hour. After the polymerization reaction for 4 hours, the system was brought to normal pressure with nitrogen gas, 8.7 g of trimellitic anhydride was added, and the mixture was stirred for 2 hours to perform a depolymerization reaction, thereby obtaining a polyester resin P-6.
(Production examples of polyester resins “P-7”, “P-9” and “P-11”)
Polyester resins “P-7”, “P-9” and “P-11” were used in the same manner as the production method of the polyester resin “P-6” except that the raw material composition shown in Table 1 was used. "
(Production example of polyester resin “P-8”)
Take 99.6 g of terephthalic acid, 16.6 g of isophthalic acid, 60.6 g of sebacic acid, 59.3 g of neopentyl glycol, and 38.4 g of ethylene glycol in a heat-resistant pressure glass container equipped with a stirrer and heat at 250 ° C. for 3 hours. Then, esterification reaction was performed. Subsequently, after adding 0.13 g of zinc acetate dihydrate as a catalyst, the temperature of the system was set to 270 ° C., and the pressure of the system was gradually reduced to 13 Pa after 1 hour. Three hours later, the system was brought to atmospheric pressure with nitrogen gas, and when the temperature of the system was lowered to 250 ° C., 1.15 g of trimellitic anhydride was added, and the mixture was stirred for 2 hours to conduct a depolymerization reaction, and polyester resin P-8 Got.
(Production examples of polyester resins “P-10” and “P-12”)
Polyester resins “P-10” and “P-12” were obtained using the same method as the production method of the polyester resin “P-8” except that the raw material composition prepared in Table 1 was used.

DDA: dodecanedioic acid, SEA: sebacic acid, ADA: adipic acid, SUAA: succinic anhydride TPA: terephthalic acid, IPA: isophthalic acid, TMA: trimellitic acid, TMAA: trimellitic anhydride,
EG: ethylene glycol, NPG: neopentyl glycol, BD: 1,4-butanediol, TMP: trimethylolpropane The compositions of polyesters “P-1” to “P-12” are shown together with physical properties in Table 2.

DDA: dodecanedioic acid, SEA: sebacic acid, ADA: adipic acid, SUA: succinic acid, TPA: terephthalic acid, IPA: isophthalic acid, TMA: trimellitic acid,
EG: ethylene glycol, NPG: neopentyl glycol, BD: 1,4-butanediol, TMP: trimethylolpropane The polyester resin aqueous dispersions used in Examples and Comparative Examples were produced as follows.
[Polyester resin water dispersion production example]
(Production of polyester resin aqueous dispersion “E-1”)
200 g of polyester resin “P-1” and 467 g of methyl ethyl ketone were taken in a 3 liter three-necked round bottom flask, immersed in a 60 ° C. hot water bath and dissolved with a stirrer until a transparent liquid was obtained. After adding 27 g of triethylamine while maintaining heating and stirring, 653 g of distilled water was added little by little while paying attention to homogenization of the system, and phase-inversion emulsification was performed. Next, this was transferred to an 85 ° C. oil bath, and methyl ethyl ketone was azeotroped with water while stirring with a condenser attached. The temperature of the oil bath was raised according to the distilling condition, and was finally set to 120 ° C. When the mass of the distillate reached 680.3 g while measuring the mass, the heating was stopped and the mixture was cooled to room temperature with a water bath. Further, 2.6 g of 28% aqueous ammonia was added and stirred, and then the liquid component in the flask was filtered through a 600 mesh (Ayatatami weave) filter to obtain an aqueous polyester resin dispersion “E-1”. . The dispersion was analyzed for various physical properties. When the appearance of this aqueous dispersion was visually observed, it was uniform without precipitation, layer separation or solidification.
(Production of polyester resin aqueous dispersion “E-2”)
The polyester resin “P-2” was used, and the same operation as in the production example of the polyester resin water dispersion E-1 was carried out except that 33 g of triethylamine and 0.9 g of 28% ammonia water added at the final stage were used. A polyester resin aqueous dispersion “E-2” was obtained.
(Production of polyester resin aqueous dispersion “E-3”)
Production of polyester resin aqueous dispersion E-1 except that polyester resin “P-3” was used and 19% of 28% ammonia water was used instead of triethylamine and 0.9 g of 28% ammonia water added in the final stage A polyester resin aqueous dispersion “E-3” was obtained in the same manner as in the examples.
(Production of polyester resin aqueous dispersion “E-4”)
200 g of polyester resin “P-4” and 467 g of methyl ethyl ketone were taken in a 3 liter three-necked round bottom flask, immersed in a 60 ° C. hot water bath and dissolved with a stirrer until a transparent liquid was obtained. After adding 35 g of triethylamine while maintaining heating and stirring, 653 g of distilled water was added little by little while paying attention to homogenization of the system, and phase-inversion emulsification was performed. Next, this was transferred to an 85 ° C. oil bath, and methyl ethyl ketone was azeotroped with water while stirring with a condenser attached. The temperature of the oil bath was raised according to the distilling condition, and was finally set to 120 ° C. When the mass of the distillate reached 680.3 g, the heating was stopped and the solution was cooled to room temperature in a water bath and solidified.
(Production of polyester resin aqueous dispersion “E-5”)
200 g of polyester resin “P-5” and 467 g of methyl ethyl ketone were taken in a 3 liter three-necked round bottom flask, immersed in a 60 ° C. hot water bath and dissolved with a stirrer until a transparent liquid was obtained. After adding 35 g of triethylamine while maintaining heating and stirring, 653 g of distilled water was added little by little while paying attention to homogenization of the system, and phase-inversion emulsification was performed. Next, this was transferred to an 85 ° C. oil bath, and methyl ethyl ketone was azeotroped with water while stirring with a condenser attached. As the distillation progressed, the resin aggregated and a uniform dispersion could not be obtained.
(Production of polyester resin aqueous dispersion “E-6”)
Manufacture of polyester resin water dispersion E-1 except that polyester resin “P-6” was used and 15 g of 28% ammonia water was used instead of triethylamine and 0.9 g of 28% ammonia water added in the final stage The same operation as in the example was performed to obtain a polyester resin aqueous dispersion “E-6”.
(Production of polyester resin aqueous dispersion “E-7”)
400 g of polyester resin “P-7” and 600 g of methyl ethyl ketone are added to a 2 liter polyethylene container, and the mixture is stirred with a stirrer (Mazela 1000, manufactured by Tokyo Rika Co., Ltd.) while heating the container with about 70 ° C. warm water. Thus, the polyester resin was completely dissolved in methyl ethyl ketone to obtain a polyester resin solution having a solid concentration of 40% by mass. Next, 500 g of the polyester resin solution was charged into a jacketed glass container (internal volume: 2 liters), and cold water was passed through the jacket to maintain the system temperature at 18 ° C., followed by stirring with a stirrer (manufactured by Tokyo Rika Co., Ltd., Mazela 1000). 600 rpm). Next, 38 g of triethylamine was added as a basic compound while stirring, and subsequently 462 g of distilled water at 18 ° C. was added at a rate of 100 g / min. During addition of the whole amount of distilled water, the system temperature was always 20 ° C. or lower. After completion of the addition of distilled water, the mixture was stirred for 30 minutes to obtain an aqueous dispersion having a solid content concentration of 20% by mass. Next, 800 g of the obtained polyester resin aqueous dispersion was charged into a round bottom flask, transferred to an oil bath at 85 ° C., and methyl ethyl ketone was azeotroped with water while stirring with a condenser. The temperature of the oil bath was raised according to the distilling condition, and was finally set to 120 ° C. When 284 g was reached while measuring the mass of the distillate, heating was stopped and the mixture was cooled to room temperature with a water bath. Further, 2.1 g of 28% ammonia water was added and stirred, and then the liquid component in the flask was filtered through a 600 mesh filter (Ayatatami Weave) to obtain an aqueous polyester resin dispersion “E-7”. . The dispersion was analyzed for various physical properties. When the appearance of this aqueous dispersion was visually observed, it was uniform without precipitation, layer separation or solidification.
(Production of polyester resin aqueous dispersions “E-8”, “E-9”, “E-11” and “E-12”)
The same operation as in the production example of the polyester resin aqueous dispersion “E-7” was performed except that polyester resins “P-8”, “P-9”, “P-11” and “P-12” were used. Thus, polyester resin aqueous dispersions “E-8”, “E-9”, “E-11” and “E-12” were obtained.
(Production of polyester resin aqueous dispersion “E-10”)
558.4 g of water, 135.0 g of isopropyl alcohol, 300 g of polyester resin “P-10”, and 6.4 g of 28% by mass ammonia water were placed in a 3 liter three-necked round bottom flask. Heated to 70 ° C. After 1 hour, 249.8 g of water was added to the system while heating and stirring was continued. Next, a condenser was attached to the flask, and the oil bath was set at 85 ° C. to distill isopropyl alcohol and water azeotropically. The temperature of the oil bath was raised according to the distillation status, and finally it was set to 120 ° C. When 249.8 g was reached while measuring the mass of the distillate, heating was stopped and the mixture was cooled to room temperature in a water bath. The liquid component in the flask was filtered with a 600 mesh (Ayatatami weave) filter to obtain an aqueous polyester resin dispersion “E-10”. The dispersion was analyzed for various physical properties. When the appearance of this aqueous dispersion was visually observed, it was uniform without precipitation, layer separation or solidification.

  Table 3 summarizes the evaluation results of the polyester resin water dispersion alone.

Example 1 "E-1" was used as the polyester resin (A) aqueous dispersion and "E-7" was used as the polyester resin (B) aqueous dispersion. 30 g of "E-1" and 70 g of "E-7" were used. The mixture was stirred and mixed at room temperature for about 5 minutes to obtain a polyester resin aqueous dispersion “E-13”.
Example 2
Using “E-1” as the polyester resin (A) aqueous dispersion and “E-7” as the polyester resin (B) aqueous dispersion, 40 g of “E-1” and 60 g of “E-7” were used at room temperature. The mixture was stirred and mixed for about 5 minutes to obtain an aqueous polyester resin dispersion “E-14”.
Example 3
Using “E-1” as the polyester resin (A) aqueous dispersion and “E-8” as the polyester resin (B) aqueous dispersion, 40 g of “E-1” and 60 g of “E-8” were used at room temperature. The mixture was stirred and mixed for about 5 minutes to obtain an aqueous polyester resin dispersion “E-15”.
Example 4
Using “E-1” as the polyester resin (A) aqueous dispersion and “E-8” as the polyester resin (B) aqueous dispersion, 50 g of “E-1” and 50 g of “E-8” were used at room temperature. A polyester resin aqueous dispersion “E-16” was obtained by stirring and mixing for about 5 minutes.
Example 5
Using “E-2” as the polyester resin (A) aqueous dispersion and “E-7” as the polyester resin (B) aqueous dispersion, 30 g of “E-2” and 70 g of “E-7” were used at room temperature. The mixture was stirred and mixed for about 5 minutes to obtain an aqueous polyester resin dispersion “E-17”.
Example 6
Using “E-3” as the polyester resin (A) aqueous dispersion and “E-8” as the polyester resin (B) aqueous dispersion, 40 g of “E-3” and 60 g of “E-8” were used at room temperature. The mixture was stirred and mixed for about 5 minutes to obtain an aqueous polyester resin dispersion “E-18”.
Comparative Example 1
The polyester resin (A) aqueous dispersion was not mixed, and “E-1” was used alone as the polyester resin (B) aqueous dispersion.
Comparative Example 2
The polyester resin (A) aqueous dispersion was not mixed, and “E-7” was used alone as the polyester resin (B) aqueous dispersion.
Comparative Example 3
The polyester resin (B) aqueous dispersion was not mixed, and “E-8” was used alone as the polyester resin (A) aqueous dispersion.
Comparative Example 4
Using “E-1” as the polyester resin (A) aqueous dispersion and “E-7” as the polyester resin (B) aqueous dispersion, 15 g of “E-1” and 85 g of “E-7” were used at room temperature. The mixture was stirred and mixed for about 5 minutes to obtain an aqueous polyester resin dispersion “E-19”.
Comparative Example 5
Using “E-1” as the polyester resin (A) aqueous dispersion and “E-7” as the polyester resin (B) aqueous dispersion, 55 g of “E-1” and 45 g of “E-7” were used at room temperature. The mixture was stirred and mixed for about 5 minutes to obtain an aqueous polyester resin dispersion “E-20”.
Comparative Example 6
Using “E-1” as the polyester resin (A) aqueous dispersion and “E-8” as the polyester resin (B) aqueous dispersion, 5 g of “E-1” and 95 g of “E-8” were used at room temperature. The polyester resin aqueous dispersion “E-21” was obtained by stirring and mixing for about 5 minutes.
Comparative Example 7
Using “E-1” as the polyester resin (A) aqueous dispersion and “E-8” as the polyester resin (B) aqueous dispersion, 60 g of “E-1” and 40 g of “E-8” were used at room temperature. A polyester resin aqueous dispersion “E-22” was obtained by stirring and mixing for about 5 minutes.
Comparative Example 8
Using “E-1” as the polyester resin (A) aqueous dispersion and “E-10” as the polyester resin (B) aqueous dispersion, 25 g of “E-1” and 75 g of “E-10” were used at room temperature. The mixture was stirred and mixed for about 5 minutes to obtain an aqueous polyester resin dispersion “E-23”.
Comparative Example 9
Using “E-1” as the polyester resin (A) aqueous dispersion and “E-11” as the polyester resin (B) aqueous dispersion, 25 g of “E-1” and 75 g of “E-11” were used at room temperature. The mixture was stirred and mixed for about 5 minutes to obtain an aqueous polyester resin dispersion “E-24”.
Comparative Example 10
Using “E-1” as the polyester resin (A) aqueous dispersion and “E-12” as the polyester resin (B) aqueous dispersion, 27 g of “E-1” and 73 g of “E-12” were used at room temperature. The mixture was stirred and mixed for about 5 minutes to obtain an aqueous polyester resin dispersion “E-25”.
Comparative Example 11
Using “E-2” as the polyester resin (A) aqueous dispersion and “E-7” as the polyester resin (B) aqueous dispersion, 15 g of “E-2” and 85 g of “E-7” were used at room temperature. The mixture was stirred and mixed for about 5 minutes to obtain an aqueous polyester resin dispersion “E-26”.
Comparative Example 12
Using “E-3” as the polyester resin (A) aqueous dispersion and “E-7” as the polyester resin (B) aqueous dispersion, 15 g of “E-3” and 85 g of “E-7” were used at room temperature. The mixture was stirred and mixed for about 5 minutes to obtain an aqueous polyester resin dispersion “E-27”.
Comparative Example 13
Using “E-6” as the polyester resin (A) aqueous dispersion and “E-8” as the polyester resin (B) aqueous dispersion, 15 g of “E-6” and 85 g of “E-8” were used at room temperature. The mixture was stirred and mixed for about 5 minutes to obtain an aqueous polyester resin dispersion “E-28”.
Comparative Example 14
Using “E-9” as the polyester resin (A) aqueous dispersion and “E-8” as the polyester resin (B) aqueous dispersion, 15 g of “E-9” and 85 g of “E-8” were used at room temperature. The mixture was stirred and mixed for about 5 minutes to obtain an aqueous polyester resin dispersion “E-29”.

  Table 4 summarizes the performance of the polyester resin aqueous dispersions obtained in the above Examples and Comparative Examples and the evaluation results of the coatings obtained therefrom.

As is clear from Table 4, in Examples 1 to 6, although “P-7” and “P-8” are tacky, they have excellent anti-blocking properties and a preferable peeling force of 0. It shows an adhesion of 3 to 4.0 N / 25 mm.

  On the other hand, each comparative example has the following problems.

  Comparative Example 1 is not adhesive.

  In Comparative Examples 2, 3, 13, and 14, blocking as much as the value close to the original adhesion occurs in the anti-blocking test, and the adhesion is large and the easy peelability is poor.

  In Comparative Examples 4, 6, 9, 10, 11, and 12, the ratio of the polyester resin (A) does not reach 30% and the blocking resistance is improved, but the adhesion is large and the easy peelability is poor.

  In Comparative Examples 5 and 7, when the ratio of the polyester resin (A) exceeds 50%, it is apparent that the adhesiveness is inferior.

  In Comparative Example 8, it is clear that the adhesiveness is remarkably lowered when the glass transition point of the polyester resin (B) exceeds 50 ° C.

The polyester resin aqueous dispersion mixture of the present invention is useful for forming a film, and is particularly useful as a packaging bag using the film and imparting easy peelability.

Claims (7)

A polyester resin (A) having a melting point of 50 to 110 ° C., a heat of crystal melting of 60 J / g or more, a cooling crystallization temperature of 30 ° C. or more, and an acid value of 20 to 40 mgKOH / g; and a number average molecular weight of 10,000 or more, a melting point of less than 50 ° C. Polyester resin (b1) having an acid value of 2 to 12 mgKOH / g, or polyester resin (b2 ) having a number average molecular weight of 10,000 or more, no melting point, glass transition point of 50 ° C. or less, and acid value of 2 to 12 mgKOH / g or Ranaru polyester resin (B); and, (a) / (B) = 30 / 70~50 / 50 polyester resin aqueous dispersion characterized by containing in the range of (mass ratio). The polyester resin (A) and / or the polyester resin (B) has a carboxyl group, and part or all of the carboxyl group is neutralized with a basic compound, and the pH of the aqueous dispersion is 6.6. It is the above, The polyester resin aqueous dispersion of Claim 1. The polyester resin (A) contains at least an aliphatic polybasic acid and an aliphatic glycol as monomer components,
The polyester resin aqueous dispersion according to claim 1 or 2, wherein the polyester resin (B) contains at least an aromatic polybasic acid and an aliphatic glycol as monomer components. The proportion of the aliphatic polybasic acid in the total acid component constituting the polyester resin (A) is 60 mol% or more,
The proportion of the aliphatic glycol in the total alcohol components constituting the polyester resin (A) is 80 mol% or more,
The proportion of the aromatic polybasic acid in the total acid component constituting the polyester resin (B) is 40 mol% or more,
The polyester resin aqueous dispersion according to claim 3, wherein the proportion of the aliphatic glycol in the total alcohol components constituting the polyester resin (B) is 80 mol% or more. A film formed by coating the aqueous polyester resin dispersion according to any one of claims 1 to 4 and then removing the dispersion medium. A packaging bag formed by coating the aqueous polyester resin dispersion according to claim 5 and then thermally fusing a film formed by removing the dispersion medium. It is a manufacturing method of the polyester resin water dispersion in any one of Claims 1-4, Comprising: The water dispersion of a polyester resin (A) and the water dispersion of a polyester resin (B) are mixed, It is characterized by the above-mentioned. Production method.