WO2023100673A1 - 樹脂チューブ - Google Patents
樹脂チューブ Download PDFInfo
- Publication number
- WO2023100673A1 WO2023100673A1 PCT/JP2022/042730 JP2022042730W WO2023100673A1 WO 2023100673 A1 WO2023100673 A1 WO 2023100673A1 JP 2022042730 W JP2022042730 W JP 2022042730W WO 2023100673 A1 WO2023100673 A1 WO 2023100673A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- poly
- hydroxyalkanoate
- resin
- weight
- hydroxybutyrate
- Prior art date
Links
- 239000011347 resin Substances 0.000 title claims abstract description 261
- 229920005989 resin Polymers 0.000 title claims abstract description 261
- 229920000739 poly(3-hydroxycarboxylic acid) polymer Polymers 0.000 claims abstract description 124
- WHBMMWSBFZVSSR-UHFFFAOYSA-N 3-hydroxybutyric acid Chemical group CC(O)CC(O)=O WHBMMWSBFZVSSR-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229920001577 copolymer Polymers 0.000 claims abstract description 21
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000009826 distribution Methods 0.000 claims abstract description 11
- 238000005227 gel permeation chromatography Methods 0.000 claims abstract description 9
- 239000002904 solvent Substances 0.000 claims abstract description 6
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- 229910003475 inorganic filler Inorganic materials 0.000 claims description 15
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- 239000000314 lubricant Substances 0.000 claims description 6
- 229920000520 poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Polymers 0.000 claims description 4
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- OURWXYGIVAQINH-UHFFFAOYSA-N 18-[4-(18-amino-18-oxooctadecyl)phenyl]octadecanamide Chemical compound NC(=O)CCCCCCCCCCCCCCCCCC1=CC=C(CCCCCCCCCCCCCCCCCC(N)=O)C=C1 OURWXYGIVAQINH-UHFFFAOYSA-N 0.000 description 1
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- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
Definitions
- the present invention relates to a resin tube containing a poly(3-hydroxyalkanoate) resin.
- Poly(3-hydroxyalkanoate)-based resin is a thermoplastic polyester that is produced and accumulated as an energy storage substance in the cells of many microbial species, and is a material that can be biodegraded not only in soil but also in seawater. Therefore, it is attracting attention as a material that solves the above problems.
- Patent Document 1 discloses a resin tube formed from a poly(3-hydroxybutyrate)-based resin and having a thickness of 0.1 to 0.6 mm as a resin tube that is flexible and can be suitably used as a straw.
- Patent Document 2 a polyhydroxyalkanoate such as poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) and a Resin compositions containing low melting point polyhydroxybutyrate are disclosed. This is said to improve the crystallization rate of polyhydroxyalkanoates.
- Patent Document 1 Although it is possible to provide a flexible resin tube formed from a poly(3-hydroxybutyrate)-based resin, the productivity and strength of the resin tube may not be sufficient. There was room for improvement. Further, according to the technique disclosed in Patent Document 2, although the crystallization speed of the poly(3-hydroxyalkanoate)-based resin is improved, the mechanical properties of the obtained molded article tend to be deteriorated. Incidentally, Patent Document 2 does not describe or suggest a resin tube.
- the object of the present invention is to provide a resin tube containing a poly(3-hydroxyalkanoate)-based resin, having high strength, and capable of being molded at high speed.
- the inventors of the present invention have found that the weight average molecular weight of the poly(3-hydroxyalkanoate) resin and the content of the low molecular weight component are set within specific ranges. found that a resin tube having high strength and capable of being molded at high speed can be constructed, and completed the present invention.
- the present invention provides a resin tube containing a poly(3-hydroxyalkanoate)-based resin, wherein the poly(3-hydroxyalkanoate)-based resin comprises 3-hydroxybutyrate units and other hydroxyalkanoate units. and the poly(3-hydroxyalkanoate)-based resin has a polystyrene equivalent weight average molecular weight of 300,000 or more and 500,000 or less by gel permeation chromatography using a chloroform solvent. and the ratio of components having a weight average molecular weight of 250,000 or less in the molecular weight distribution is 15% by weight or more and 40% by weight or less.
- a resin tube that contains a poly(3-hydroxyalkanoate)-based resin, has high strength, and can be molded at high speed.
- One embodiment of the present invention relates to a resin tube containing a poly(3-hydroxyalkanoate)-based resin.
- the poly(3-hydroxyalkanoate) resin (abbreviation: P3HA) constituting the main resin component of the resin tube is a polymer containing 3-hydroxyalkanoate structural units (monomer units).
- P3HA poly(3-hydroxyalkanoate) resin
- One kind of poly(3-hydroxyalkanoate)-based resin may be used, or two or more kinds of poly(3-hydroxyalkanoate)-based resins may be used in combination.
- the 3-hydroxyalkanoate structural unit is preferably a structural unit represented by the following general formula (1). [-CHR-CH 2 -CO-O-] (1)
- R represents an alkyl group represented by C p H 2p+1 , and p represents an integer of 1-15.
- R include linear or branched alkyl groups such as methyl group, ethyl group, propyl group, methylpropyl group, butyl group, isobutyl group, t-butyl group, pentyl group and hexyl group.
- p 1 to 10 are preferable, and 1 to 8 are more preferable.
- poly(3-hydroxyalkanoate)-based resin a poly(3-hydroxyalkanoate)-based resin produced from microorganisms is particularly preferable.
- Poly(3-hydroxyalkanoate) resins produced from microorganisms contain all 3-hydroxyalkanoate structural units as (R)-3-hydroxyalkanoate structural units.
- the poly(3-hydroxyalkanoate)-based resin preferably contains 3-hydroxyalkanoate structural units (especially structural units represented by the general formula (1)) in an amount of 50 mol% or more of all structural units, More preferably 60 mol% or more, more preferably 70 mol% or more.
- Poly(3-hydroxyalkanoate)-based resins may contain only one or two or more 3-hydroxyalkanoate structural units as repeating units constituting the polymer, or may contain one or two or more In addition to the 3-hydroxyalkanoate structural unit, other structural units (eg, 4-hydroxyalkanoate structural unit, etc.) may be included.
- poly(3-hydroxyalkanoate) resins include poly(3-hydroxybutyrate), poly(3-hydroxybutyrate-co-3-hydroxypropionate), poly(3-hydroxy butyrate-co-3-hydroxyvalerate) (abbreviation: P3HB3HV), poly(3-hydroxybutyrate-co-3-hydroxyvalerate-3-hydroxyhexanoate), poly(3-hydroxybutyrate-co -3-hydroxyhexanoate) (abbreviation: P3HB3HH), poly (3-hydroxybutyrate-co-3-hydroxyheptanoate), poly (3-hydroxybutyrate-co-3-hydroxyoctanoate), Poly(3-hydroxybutyrate-co-3-hydroxynonanoate), Poly(3-hydroxybutyrate-co-3-hydroxydecanoate), Poly(3-hydroxybutyrate-co-3-hydroxyundecanoate) ate), poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (abbreviation: P3HB4HB), and
- the poly(3-hydroxyalkanoate)-based resin is at least one copolymer of 3-hydroxybutyrate units (hereinafter sometimes referred to as 3HB) and other hydroxyalkanoate units. including.
- the poly(3-hydroxyalkanoate)-based resin may contain only one type of the copolymer, or may contain two or more types of the copolymer. Further, the poly(3-hydroxyalkanoate)-based resin may consist of at least one of the copolymers alone, or in addition to at least one of the copolymers, poly(3- hydroxybutyrate), that is, a homopolymer of 3-hydroxybutyrate.
- the copolymer of 3-hydroxybutyrate units and other hydroxyalkanoate units is poly(3-hydroxybutyrate-co-3-hydroxyvalerate), poly(3-hydroxybutyrate-co-3-hydroxyvalerate-co-3-hydroxyhexanoate), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate), and poly(3-hydroxy butyrate-co-4-hydroxybutyrate), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) and/or poly(3 -hydroxybutyrate-co-4-hydroxybutyrate) is more preferred, and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) is even more preferred.
- the average content of each monomer unit in the entire poly(3-hydroxyalkanoate)-based resin can be determined by a method known to those skilled in the art, for example, the method described in paragraph [0047] of WO 2013/147139.
- the average content ratio means the ratio of each monomer unit to all monomer units contained in the entire poly(3-hydroxyalkanoate) resin contained in the resin tube.
- the poly(3-hydroxyalkanoate)-based resin is a mixture of two or more poly(3-hydroxyalkanoate)-based resins, it refers to the ratio of each monomer contained in the entire mixture.
- the weight average molecular weight of the poly(3-hydroxyalkanoate)-based resin is set to the range of 300,000 or more and 500,000 or less. Control. If the weight-average molecular weight is less than 300,000, the melt viscosity of the poly(3-hydroxyalkanoate)-based resin tends to be too low, making continuous molding of resin tubes by melt extrusion difficult. Even if it can be molded, the resin tube tends to have low strength.
- the weight average molecular weight is preferably 350,000 to 480,000, more preferably 360,000 to 460,000, and even more preferably 370,000 to 450,000.
- the weight-average molecular weight of the poly(3-hydroxyalkanoate)-based resin is the weight-average molecular weight measured for the entire poly(3-hydroxyalkanoate)-based resin contained in the resin tube.
- the poly(3-hydroxyalkanoate)-based resin is composed of a mixture of two or more poly(3-hydroxyalkanoate)-based resins, if the weight average molecular weight measured for the entire mixture is within the above range good. At this time, the weight average molecular weight of each poly(3-hydroxyalkanoate)-based resin contained in the mixture is not particularly limited.
- the weight average molecular weight of the poly(3-hydroxyalkanoate) resin can be measured by polystyrene conversion using gel permeation chromatography using chloroform solvent.
- a column suitable for measuring the weight average molecular weight may be used.
- the weight average molecular weight in the molecular weight distribution in the poly(3-hydroxyalkanoate) resin is 250,000.
- the content of the low-molecular-weight components below is controlled to 15% by weight or more and 40% by weight or less. If the content of the low-molecular-weight component is less than 15% by weight, the molding speed of the resin tube tends to be slow. On the other hand, when the content of the low-molecular-weight component exceeds 40% by weight, the strength of the resin tube tends to be low.
- the content of the low molecular weight component is preferably 18 to 35% by weight, more preferably 20 to 30% by weight.
- the content ratio of the low-molecular weight component is a value measured for the entire poly(3-hydroxyalkanoate) resin contained in the resin tube.
- the poly(3-hydroxyalkanoate)-based resin is composed of a mixture of two or more poly(3-hydroxyalkanoate)-based resins
- the content of the low-molecular-weight component measured for the entire mixture is within the above range. should be inside.
- the content of the low-molecular-weight component in each poly(3-hydroxyalkanoate)-based resin contained in the mixture is not particularly limited.
- the content ratio of the low-molecular-weight component is obtained by converting the weight-average molecular weight distribution obtained by the measurement of the weight-average molecular weight described above into the weight-average molecular weight cumulative distribution shown in FIG. It can be determined by calculating the ratio of the following low molecular weight components. However, in order to remove the influence of components such as additives, the portion having a weight average molecular weight of 1000 or less is not considered in the above calculation.
- the method for obtaining the poly(3-hydroxyalkanoate) resin that satisfies the weight-average molecular weight and low-molecular weight component ratio requirements is not particularly limited, and known techniques for adjusting the molecular weight of polyester can be applied as appropriate.
- One example is a method of mixing two or more poly(3-hydroxyalkanoate) resins having different molecular weights.
- a high molecular weight poly(3-hydroxyalkanoate) resin having a weight average molecular weight in the range of 400,000 to 800,000 (preferably 450,000 to 750,000, more preferably 500,000 to 700,000) and ,
- a low molecular weight poly (3-hydroxyalkanoate) resin having a weight average molecular weight in the range of 100,000 to 400,000 (preferably 120,000 to 350,000, more preferably 150,000 to 300,000) is blended,
- a method of adjusting the total weight average molecular weight and the ratio of low molecular weight components is included.
- the ratio of the high-molecular-weight poly(3-hydroxyalkanoate)-based resin and the low-molecular-weight poly(3-hydroxyalkanoate)-based resin may be set as appropriate.
- the weight ratio is 50:50 to 95:5. is preferred, 60:40 to 90:10 is more preferred, and 65:35 to 85:15 is even more preferred.
- the poly(3-hydroxyalkanoate)-based resin constituting the resin tube is at least two kinds of poly(3 -hydroxyalkanoate)-based resin.
- the poly(3-hydroxyalkanoate)-based resin constituting the resin tube comprises at least one highly crystalline poly(3-hydroxyalkanoate)-based resin (A) and at least one It is particularly preferred to contain a low-crystalline poly(3-hydroxyalkanoate)-based resin (B).
- highly crystalline poly (3-hydroxyalkanoate) resin (A) has excellent productivity but poor mechanical strength
- low crystalline poly (3-hydroxyalkanoate) resin (B ) has poor productivity but excellent mechanical properties.
- the highly crystalline poly (3-hydroxyalkanoate) resin (A) forms fine resin crystal particles
- the low crystalline poly (3-hydroxyalkanoate) resin ( B) is presumed to form tie molecules that crosslink the resin crystal particles.
- the highly crystalline poly(3-hydroxyalkanoate) resin (A) contains 3-hydroxybutyrate units, it is included in the highly crystalline poly(3-hydroxyalkanoate) resin (A).
- the content of 3-hydroxybutyrate units is preferably higher than the average content of 3-hydroxybutyrate units in all monomer units constituting the poly(3-hydroxyalkanoate) resin contained in the resin tube. .
- the highly crystalline poly(3-hydroxyalkanoate) resin (A) contains 3-hydroxybutyrate units and other hydroxyalkanoate units
- the other hydroxyalkanoate in the highly crystalline resin (A) The unit content is preferably 1 mol % or more and 6 mol % or less, more preferably 2 mol % or more and 6 mol % or less.
- poly(3-hydroxyalkanoate) resin (A) poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) or poly(3-hydroxybutyrate-co -4-hydroxybutyrate) is preferred, and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) is more preferred.
- the weight-average molecular weight of the highly crystalline poly(3-hydroxyalkanoate)-based resin (A) is the weight-average molecular weight of the entire poly(3-hydroxyalkanoate)-based resin contained in the resin tube described above, and the It is not particularly limited as long as it is set so as to satisfy the ratio of low-molecular-weight components in the entire resin.
- the highly crystalline poly(3-hydroxyalkanoate)-based resin (A) contains a poly(3-hydroxyalkanoate)-based resin having a relatively low weight average molecular weight. is preferred.
- the highly crystalline poly(3-hydroxyalkanoate) resin (A) is composed of a poly(3-hydroxyalkanoate) resin having a relatively low weight average molecular weight and a poly(3-hydroxyalkanoate) resin having a relatively high weight average molecular weight.
- 3-hydroxyalkanoate)-based resins are more preferably included.
- the low-crystalline poly(3-hydroxyalkanoate)-based resin (B) contains 3-hydroxybutyrate units
- the low-crystalline poly(3-hydroxyalkanoate)-based resin (B) contains 3-hydroxybutyrate units
- the low-crystalline poly(3-hydroxyalkanoate)-based resin (B) The content of 3-hydroxybutyrate units contained in the resin tube is lower than the average content of 3-hydroxybutyrate units in all monomer units constituting the poly(3-hydroxyalkanoate) resin contained in the resin tube. is preferred.
- the unit content is preferably 24 mol% or more and 99 mol% or less, more preferably 24 mol% or more and 50 mol% or less, still more preferably 24 mol% or more and 35 mol% or less, and 24 mol% or more and 30 mol% or less. Especially preferred.
- poly(3-hydroxyalkanoate) resin (B) poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) or poly(3-hydroxybutyrate-co -4-hydroxybutyrate) is preferred, and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) is more preferred.
- the weight-average molecular weight of the low-crystalline poly(3-hydroxyalkanoate)-based resin (B) is the weight-average molecular weight of the entire poly(3-hydroxyalkanoate)-based resin contained in the resin tube described above, and the It is not particularly limited as long as it is set so as to satisfy the ratio of low-molecular-weight components in the entire resin.
- the low-crystalline poly(3-hydroxyalkanoate)-based resin (B) has a relatively high weight-average molecular weight. Specifically, it is preferably 400,000 or more and 800,000 or less, more preferably 450,000 or more and 750,000 or less, and even more preferably 500,000 or more and 700,000 or less.
- the ratio of each resin to the total amount of both resins is not particularly limited, but it is preferable that the resin (A) is 60% by weight or more and 97% by weight or less and the resin (B) is 3% by weight or more and 40% by weight or less.
- the ratio of the low-crystalline poly(3-hydroxyalkanoate)-based resin (B) is 3% by weight or less, so that the strength of the resin tube can be sufficiently increased, and the ratio is 40% by weight or less. This tends to facilitate continuous molding of resin tubes by melt extrusion.
- the resin (A) is 65% by weight or more and 95% by weight or less, the resin (B) is 5% by weight or more and 35% by weight or less, and the resin (A) is 70% by weight or more and 90% by weight or less. It is more preferable that the resin (B) is 10% by weight or more and 30% by weight or less.
- the method for producing the poly(3-hydroxyalkanoate)-based resin is not particularly limited, and may be a production method by chemical synthesis or a production method by microorganisms. Among them, the production method using microorganisms is preferable.
- a known method can be applied to the production method using microorganisms.
- 3-hydroxybutyrate and other hydroxyalkanoate copolymer-producing bacteria include Aeromonas caviae, which is a P3HB3HV and P3HB3HH-producing bacterium, Alcaligenes eutrophus, which is a P3HB4HB-producing bacterium, and the like. It has been known.
- Alcaligenes eutrophus AC32 strain Alcaligenes eutrophus AC32, FERM BP-6038
- T.Fukui, Y.Doi, J.Bateriol into which a P3HA synthase group gene was introduced in order to increase the productivity of P3HB3HH .
- 179, p4821-4830 (1997) are more preferred, and microbial cells obtained by culturing these microorganisms under appropriate conditions and accumulating P3HB3HH in the cells are used.
- genetically modified microorganisms into which various poly(3-hydroxyalkanoate) resin synthesis-related genes have been introduced may be used according to the poly(3-hydroxyalkanoate) resin to be produced. Optimization of culture conditions, including the type of With these, the content of 3-hydroxybutyrate units in the poly(3-hydroxyalkanoate) resin can be adjusted.
- the resin component contained in the resin tube may be composed only of poly(3-hydroxyalkanoate)-based resin, but in addition to poly(3-hydroxyalkanoate)-based resin, poly(3-hydroxyalkanoate) ) may contain other resins that do not correspond to the system resin.
- examples of such other resins include aliphatic polyester resins such as polylactic acid, polybutylene succinate adipate, polybutylene succinate, and polycaprolactone; Aliphatic-aromatic polyester-based resins such as late terephthalate and the like are included.
- the other resin only one kind may be contained, or two or more kinds may be contained.
- the content of the other resin is not particularly limited, it is preferably as small as possible from the viewpoint of the seawater decomposability of the resin tube.
- the content of the other resin is preferably 35 parts by weight or less, more preferably 30 parts by weight or less, and 20 parts by weight or less with respect to 100 parts by weight of the poly(3-hydroxyalkanoate) resin. is more preferable, and 10 parts by weight or less is even more preferable.
- the lower limit of the content of the other resin is not particularly limited, and may be 0 parts by weight.
- the resin tube may not contain an inorganic filler, it preferably contains an inorganic filler from the viewpoint of improving the strength of the resin tube.
- the inorganic filler is not particularly limited as long as it can be used in resin tubes, and examples thereof include quartz, fumed silica, silicic anhydride, fused silica, crystalline silica, amorphous silica, and fillers obtained by condensing alkoxysilanes.
- silica-based inorganic fillers such as ultrafine amorphous silica, alumina, zircon, iron oxide, zinc oxide, titanium oxide, silicon nitride, boron nitride, aluminum nitride, silicon carbide, glass, silicone rubber, silicone resin, titanium oxide, carbon Fiber, mica, graphite, carbon black, ferrite, graphite, diatomaceous earth, clay, clay, talc, calcium carbonate, manganese carbonate, magnesium carbonate, barium sulfate, silver powder and the like. These may be used alone or in combination of two or more.
- the inorganic filler may be surface-treated in order to improve its dispersibility in the resin tube.
- Treatment agents used for surface treatment include higher fatty acids, silane coupling agents, titanate coupling agents, sol-gel coating agents, resin coating agents and the like.
- the water content of the inorganic filler is preferably 0.01 to 10%, more preferably 0.01 to 5%, since it is easy to suppress hydrolysis of the poly(3-hydroxyalkanoate)-based resin. 0.01 to 1% is more preferred.
- the water content can be determined according to JIS-K5101.
- the average particle size of the inorganic filler is preferably 0.1 to 100 ⁇ m, more preferably 0.1 to 50 ⁇ m, and even more preferably 0.1 to 30 ⁇ m, because the resin tube has excellent properties and workability. Particularly preferred is 0.1 to 15 ⁇ m.
- the average particle size can be measured using a laser diffraction/scattering device such as "Microtrac MT3100II” manufactured by Nikkiso Co., Ltd.
- inorganic fillers belonging to silicates are preferable because they can improve heat resistance and workability. Furthermore, since the effect of improving the strength of the resin tube is large, the particle size distribution is small and the surface smoothness and mold transferability are not easily hindered, among the silicates, talc, mica, kaolinite, montmorillonite, and smectite are used. One or more selected from the group are preferred. Two or more kinds of silicates may be used in combination, and in that case, the kinds of silicates and the ratio of use thereof can be appropriately adjusted.
- talc examples include general-purpose talc, surface-treated talc, and the like.
- Talc manufactured by Kogyosha and Maruo Calcium is exemplified.
- Examples of the mica include wet pulverized mica and dry pulverized mica, and specific examples include mica manufactured by Yamaguchi Mica Co. and Keiwa Rozai Co., Ltd.
- Examples of the kaolinite include dry kaolin, calcined kaolin, and wet kaolin. , "ULTREX” (registered trademark), and kaolinite manufactured by Keiwa Rozai Co., Ltd. are exemplified.
- the blending amount is 100 in total for the resin components including the poly(3-hydroxyalkanoate)-based resin, from the viewpoint of improving the strength of the resin tube and ensuring fluidity during melt molding. It is preferably 1 part by weight or more and 30 parts by weight or less based on the weight part. 5 to 25 parts by weight is more preferred.
- the resin tube may contain additives other than the inorganic filler as long as the effects of the invention are not impaired.
- Additives include, for example, crystal nucleating agents, lubricants, plasticizers, antistatic agents, flame retardants, conductive agents, heat insulating agents, cross-linking agents, antioxidants, ultraviolet absorbers, coloring agents, organic fillers, and hydrolysis inhibitors. agents and the like can be used depending on the purpose. In particular, biodegradable additives are preferred.
- crystal nucleating agents examples include pentaerythritol, orotic acid, aspartame, cyanuric acid, glycine, zinc phenylphosphonate, and boron nitride.
- Poly(3-hydroxybutyrate) can also be added as a crystal nucleating agent.
- pentaerythritol is preferred because it has a particularly excellent effect of promoting the crystallization of poly(3-hydroxyalkanoate)-based resins.
- the crystal nucleating agent may be used alone or in combination of two or more, and the mixing ratio can be appropriately adjusted according to the purpose.
- the resin tube may not contain a crystal nucleating agent (especially pentaerythritol).
- the amount of the crystal nucleating agent to be added is not particularly limited. 0.1 to 10 parts by weight, more preferably 0.5 to 8.5 parts by weight, still more preferably 0.7 to 6 parts by weight, and particularly preferably 0.8 to 3 parts by weight.
- poly(3-hydroxybutyrate) when added as a crystal nucleating agent, the amount added is not particularly limited, but poly(3-hydroxyalkanoate) resins other than the poly(3-hydroxybutyrate) It is preferably 0.1 to 15 parts by weight, more preferably 1 to 10 parts by weight, still more preferably 3 to 8 parts by weight, and particularly preferably 4 to 7 parts by weight with respect to 100 parts by weight.
- lubricants include behenic acid amide, oleic acid amide, erucic acid amide, stearic acid amide, palmitic acid amide, N-stearylbehenic acid amide, N-stearyl erucic acid amide, ethylene bis stearic acid amide, ethylene bis oleic acid amide, ethylenebiserucamide, ethylenebislaurylamide, ethylenebiscapricamide, p-phenylenebisstearicamide, polycondensates of ethylenediamine, stearic acid and sebacic acid.
- behenic acid amide or erucic acid amide is preferable because of its particularly excellent lubricating effect on poly(3-hydroxyalkanoate)-based resins.
- the lubricant may be used not only by one type but also by mixing two or more types, and the mixing ratio can be appropriately adjusted depending on the purpose.
- the amount of the lubricant used is not particularly limited, but is preferably 0.01 to 5 parts by weight, more preferably 0.05 to 3 parts by weight, based on 100 parts by weight of the poly(3-hydroxyalkanoate) resin. More preferably 0.1 to 1.5 parts by weight.
- plasticizers include glycerin ester compounds, citrate compounds, sebacate compounds, adipate compounds, polyether ester compounds, benzoate compounds, phthalate compounds, isosol
- plasticizers include bidester-based compounds, polycaprolactone-based compounds, and dibasic acid ester-based compounds.
- glycerin ester-based compounds, citric acid ester-based compounds, sebacate-based compounds, and dibasic acid ester-based compounds are preferred because they have particularly excellent plasticizing effects on poly(3-hydroxyalkanoate)-based resins.
- glycerin ester compounds include glycerin diacetomonolaurate and the like.
- citrate compounds include acetyl tributyl citrate and the like.
- sebacate-based compounds include dibutyl sebacate and the like.
- dibasic acid ester compounds include benzylmethyldiethylene glycol adipate.
- the plasticizer may be used in a mixture of two or more kinds as well as one kind, and the mixing ratio can be appropriately adjusted depending on the purpose.
- the amount of the plasticizer to be used is not particularly limited, but is preferably 0 to 20 parts by weight, more preferably 0 to 15 parts by weight, with respect to the total 100 parts by weight of the resin components including the poly(3-hydroxyalkanoate)-based resin. parts by weight, more preferably 0 to 10 parts by weight, particularly preferably 0 to 5 parts by weight.
- tube refers to an elongated cylindrical molded article having a substantially constant wall thickness, a substantially circular cross-sectional shape, and a hollow interior.
- the tube can be used as a straw or pipe, but the uses are not limited to these.
- the thickness of the resin tube is such that it will not be crushed by suction when drinking a beverage as a straw, and because it has appropriate flexibility, it will not easily break, and it will not easily break when a fingertip or the like is poked.
- 0.01 mm or more and 0.6 mm or less, more preferably 0.05 mm or more and 0.5 mm or less, and 0.1 mm or more and 0.4 mm More preferred are:
- the outer diameter of the resin tube is not particularly limited, but is preferably 2 to 10 mm, more preferably 4 to 8 mm, in terms of ease of use when drinking beverages as a straw. More preferably, 5 to 7 mm is even more preferable.
- the thickness of the resin tube can be appropriately set by those skilled in the art, but is preferably 0.7 mm or more and 10 mm or less, more preferably 1 mm or more and 8 mm or less.
- the pipe can be suitably used in aquaculture and fishing of marine products.
- the cross-sectional shape of the resin tube is substantially circular, but from the viewpoint of usability as a straw or pipe, it is preferable that the cross-sectional shape is as close to a perfect circle as possible. Therefore, the flatness of the cross-sectional shape of the tube [100 x (maximum outer diameter - minimum outer diameter)/maximum outer diameter] is preferably 10% or less, more preferably 8% or less. , is more preferably 5% or less, and even more preferably 3% or less. A flatness of 0% means that the cross-sectional shape is a perfect circle.
- the length of the resin tube is not particularly limited. However, when the resin tube is used as a straw, the length of the resin tube is preferably 50 to 350 mm, more preferably 70 to 300 mm, more preferably 90 to 270 mm, in terms of ease of use when drinking beverages as a straw. is more preferred.
- the resin tube used as a straw may be a tube that has not been subjected to secondary processing, or may be a tube that has undergone secondary processing such as forming a stopper portion or forming a bellows portion.
- secondary processing can be performed while heating the resin tube, it is preferably performed at room temperature.
- a poly(3-hydroxyalkanoate) resin containing a copolymer of at least 3-hydroxybutyrate units and other hydroxyalkanoate units, and optionally other resins, inorganic fillers, other additions
- Add the agent melt and knead using an extruder, kneader, Banbury mixer, rolls, etc. to prepare a resin composition, extrude it into strands, cut it, and shape it into cylindrical, cylindric, spherical, or cubic shapes.
- Pellets having a particle shape such as a shape and a rectangular parallelepiped shape are obtained. It is desirable that the produced pellets are sufficiently dried at 40 to 80° C. to remove moisture, and then subjected to tube molding.
- the temperature at which the melt-kneading is carried out depends on the melting point, melt viscosity, etc. of the resin to be used, and cannot be categorically defined. 145 to 185°C is more preferred, and 150 to 180°C is even more preferred.
- the resin temperature of the melt-kneaded product is 140° C. or higher, the resin component including the poly(3-hydroxyalkanoate)-based resin can be sufficiently melted, and when it is 190° C. or lower, poly( 3-Hydroxyalkanoate) can suppress thermal decomposition of resin components including resins.
- the pellets thus produced are melted in an extruder, they can be molded into a tubular shape by extruding them through an annular die connected to the outlet of the extruder and putting them into water for solidification.
- the blended product of each component may be melted in an extruder and then directly molded into a tubular shape without being pelletized.
- a resin tube containing a poly(3-hydroxyalkanoate)-based resin contains at least one copolymer of 3-hydroxybutyrate units and other hydroxyalkanoate units,
- the poly(3-hydroxyalkanoate) resin has a polystyrene-equivalent weight-average molecular weight of 300,000 or more and 500,000 or less by gel permeation chromatography using a chloroform solvent, and a weight-average molecular weight in the molecular weight distribution.
- the copolymers of 3-hydroxybutyrate units and other hydroxyalkanoate units are poly(3-hydroxybutyrate-co-3-hydroxyvalerate), poly(3-hydroxybutyrate-co-3- from hydroxyvalerate-co-3-hydroxyhexanoate), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate), and poly(3-hydroxybutyrate-co-4-hydroxybutyrate)
- the resin tube according to item 1 which is one or more selected from the group consisting of:
- the poly(3-hydroxyalkanoate)-based resin is a copolymer of 3-hydroxybutyrate units and other hydroxyalkanoate units ( A), and 4.
- [Item 5] 5 5.
- Additive-1 Polyhydroxybutyrate (weight average molecular weight is 300,000 g/mol) It was produced according to the method described in Comparative Example 1 of WO 2004/041936.
- Additive-2 behenic acid amide (manufactured by Nippon Fine Chemical Co., Ltd.: BNT-22H)
- Additive-3 Erucamide (manufactured by Nippon Fine Chemical Co., Ltd.: Neutron-S)
- GPC measuring device Hitachi RI monitor (L-3000) Column: Showa Denko KG (1 piece), K-806L (2 pieces) Sample concentration: 3mg/ml Free liquid: chloroform solvent Free liquid flow rate: 1.0 ml/min Sample injection volume: 100 ⁇ L Analysis time: 30 minutes Standard sample: Polystyrene
- the weight-average molecular weight of the poly(3-hydroxyalkanoate)-based resin after compounding in each example or comparative example was 0.45 ⁇ m made of PTFE, using each pellet described later as the poly(3-hydroxyalkanoate)-based resin.
- the same method as the method for measuring the weight average molecular weight of each poly(3-hydroxyalkanoate) resin before blending described above was used. measured by Table 2 shows the results.
- the produced resin tube was cut into a length of 40 mm to obtain a test piece.
- a test piece is placed on a plate with a 2 mm thick rubber sheet laid on a 3 mm thick SUS plate, and a weight of any weight is allowed to fall freely from any height. Based on the destruction results at that time, The 50% breaking energy was calculated by estimating the drop height at which the breaking probability is 50%.
- the shape of the weight was a rectangular parallelepiped, and the weight was dropped so that the straw and the weight were in parallel contact.
- Example 1 1.00 kg of PHA-1, 3.25 kg of PHA-2 and 0.75 kg of PHA-4 were blended so that the resin composition shown in Table 1 was obtained, and 500 g of Additive-1 and Additive-2 were blended. and 25 g of Additive-3 were blended and dry-blended.
- the obtained resin material (resin mixture) was put into a ⁇ 26 mm co-rotating twin-screw extruder with a cylinder temperature of 150° C. and a die temperature of 150° C. and extruded.
- the resin composition pellets were obtained by passing the extruded resin material through a water tank filled with hot water at 40° C. to solidify strands and cutting them with a pelletizer.
- the cylinder temperature and the die temperature of a single-screw extruder of ⁇ 50 mm connected to an annular die were set to 165° C. respectively, and the resin composition pellets were charged and extruded into a tubular shape.
- the extruded tube was passed through a 40° C. water bath located 100 mm away from the annular die, and was taken up by a take-up machine.
- a resin tube having an outer diameter of 6 mm and a wall thickness of 0.2 mm was obtained at a maximum take-up speed of 40 m/min.
- the obtained tube was cured in an environment of 25° C. and 60% RH, cut into a length of 40 mm, and used as a test piece for tube strength. Using this test piece, the 50% breaking energy was calculated as described above and was 1.02J.
- Table 2 summarizes the evaluation results of tube productivity and tube strength.
- Example 2 Comparative Examples 1-3
- Resin composition pellets were produced in the same manner as in Example 1 except that the formulation was changed as shown in Table 1, and the same evaluation as in Example 1 was performed. The results are summarized in Table 2.
- Table 2 reveals the following.
- the productivity of the resin tube was high, molding was possible at high speed, and the obtained resin tube had high strength.
- the productivity of the resin tubes was inferior to that of each example, and the obtained resin tubes also had low strength. Comparative Example 3 could not form a resin tube under the evaluation conditions.
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Abstract
Description
また、特許文献2に開示された技術によると、ポリ(3-ヒドロキシアルカノエート)系樹脂の結晶化速度は改善されるものの、得られる成形体の機械物性が低下する傾向があった。尚、特許文献2では、樹脂チューブについては記載も示唆もされていない。
前記樹脂チューブの主要な樹脂成分を構成するポリ(3-ヒドロキシアルカノエート)系樹脂(略称:P3HA)は、3-ヒドロキシアルカノエート構造単位(モノマー単位)を含む重合体である。1種のポリ(3-ヒドロキシアルカノエート)系樹脂を用いてもよいし、2種以上のポリ(3-ヒドロキシアルカノエート)系樹脂を組合せて用いても良い。
[-CHR-CH2-CO-O-] (1)
前記樹脂チューブに含まれる樹脂成分は、ポリ(3-ヒドロキシアルカノエート)系樹脂のみから構成されてもよいが、ポリ(3-ヒドロキシアルカノエート)系樹脂に加えて、ポリ(3-ヒドロキシアルカノエート)系樹脂に該当しない他の樹脂を含むものであってもよい。そのような他の樹脂としては、例えば、ポリ乳酸、ポリブチレンサクシネートアジペート、ポリブチレンサクシネート、ポリカプロラクトンなどの脂肪族ポリエステル系樹脂や、ポリブチレンアジペートテレフタレート、ポリブチレンセバテートテレフタレート、ポリブチレンアゼレートテレフタレートなどの脂肪族芳香族ポリエステル系樹脂等が挙げられる。他の樹脂としては1種のみが含まれていてもよいし、2種以上が含まれていてもよい。
前記樹脂チューブは、無機フィラーを含有しないものであってもよいが、樹脂チューブの強度向上の観点から、無機フィラーを含有することが好ましい。
前記樹脂チューブは、発明の効果を阻害しない範囲において、無機フィラー以外の添加剤を含有してもよい。添加剤としては、例えば、結晶核剤、滑剤、可塑剤、帯電防止剤、難燃剤、導電剤、断熱剤、架橋剤、酸化防止剤、紫外線吸収剤、着色剤、有機充填剤、加水分解抑制剤等を目的に応じて使用できる。特に生分解性を有する添加剤が好ましい。
本願明細書において、チューブとは、略一定の肉厚を有しており断面形状が略円形の壁面から構成され、内部が空洞になっている細長い円筒状の成形品のことをいう。該チューブは、ストロー、又は、パイプとして使用することができるが、用途はこれらに限定されない。
以下では、前記樹脂チューブの製造方法の一例を具体的に説明する。
[項目1]
ポリ(3-ヒドロキシアルカノエート)系樹脂を含有する樹脂チューブであって、
前記ポリ(3-ヒドロキシアルカノエート)系樹脂は、3-ヒドロキシブチレート単位と他のヒドロキシアルカノエート単位との共重合体の少なくとも1種を含み、
前記ポリ(3-ヒドロキシアルカノエート)系樹脂は、クロロホルム溶媒を用いたゲルパーミエーションクロマトグラフィー法によるポリスチレン換算の重量平均分子量が30万以上50万以下であり、かつ、分子量分布において重量平均分子量が25万以下の成分が占める割合が15重量%以上40重量%以下である、樹脂チューブ。
[項目2]
前記3-ヒドロキシブチレート単位と他のヒドロキシアルカノエート単位との共重合体が、ポリ(3-ヒドロキシブチレート-コ-3-ヒドロキシバレレート)、ポリ(3-ヒドロキシブチレート-コ-3-ヒドロキシバレレート-コ-3-ヒドロキシヘキサノエート)、ポリ(3-ヒドロキシブチレート-コ-3-ヒドロキシヘキサノエート)、及びポリ(3-ヒドロキシブチレート-コ-4-ヒドロキシブチレート)からなる群より選択される1種以上である、項目1に記載の樹脂チューブ。
[項目3]
前記3-ヒドロキシブチレート単位と他のヒドロキシアルカノエート単位との共重合体が、ポリ(3-ヒドロキシブチレート-コ-3-ヒドロキシヘキサノエート)である、項目1に記載の樹脂チューブ。
[項目4]
前記ポリ(3-ヒドロキシアルカノエート)系樹脂が、他のヒドロキシアルカノエート単位の含有割合が1~6モル%である、3-ヒドロキシブチレート単位と他のヒドロキシアルカノエート単位との共重合体(A)、及び、
他のヒドロキシアルカノエート単位の含有割合が24モル%以上である、3-ヒドロキシブチレート単位と他のヒドロキシアルカノエート単位との共重合体(B)を含む、項目1~3のいずれかに記載の樹脂チューブ。
[項目5]
前記共重合体(B)は、重量平均分子量が40万以上80万以下である、項目1~4のいずれかに記載の樹脂チューブ。
[項目6]
前記ポリ(3-ヒドロキシアルカノエート)系樹脂以外の樹脂の含有量が、前記ポリ(3-ヒドロキシアルカノエート)系樹脂100重量部に対して0重量部以上35重量部以下である、項目1~5のいずれかに記載の樹脂チューブ。
[項目7]
結晶核剤及び/又は滑剤をさらに含有する、項目1~6のいずれかに記載の樹脂チューブ。
[項目8]
前記ポリ(3-ヒドロキシアルカノエート)系樹脂を含む樹脂成分の合計100重量部に対して、1重量部以上30重量部以下の無機フィラーをさらに含有する、項目1~7のいずれかに記載の樹脂チューブ。
[項目9]
前記樹脂チューブの肉厚が0.01mm以上0.6mm以下である、項目1~8のいずれかに記載の樹脂チューブ。
[項目10]
前記樹脂チューブの肉厚が0.7mm以上10mm以下である、項目1~9のいずれかに記載の樹脂チューブ。
[ポリ(3-ヒドロキシアルカノエート)系樹脂]
PHA-1:P3HB3HH(平均含有比3HB/3HH=95.4/4.6(モル%/モル%)、重量平均分子量は25万g/mol)
国際公開第2019/142845号の実施例2に記載の方法に準じて製造した。
PHA-2:P3HB3HH(平均含有比3HB/3HH=95.4/4.6(モル%/モル%)、重量平均分子量は55万g/mol)
国際公開第2019/142845号の実施例2に記載の方法に準じて製造した。
PHA-3:P3HB3HH(平均含有比3HB/3HH=95.4/4.6(モル%/モル%)、重量平均分子量は15万g/mol)
国際公開第2019/142845号の実施例2に記載の方法に準じて製造した。
PHA-4:P3HB3HH(平均含有比3HB/3HH=71.8/28.2(モル%/モル%)、重量平均分子量は66万g/mol)
国際公開第2019/142845号の実施例9に記載の方法に準じて製造した。
PHA-5:X131A(カネカ生分解性ポリマーPHBH(登録商標))(平均含有比3HB/3HH=94/6(モル%/モル%)、重量平均分子量は60万g/mol)
添加剤-1:ポリヒドロキシブチレート(重量平均分子量は30万g/mol)
国際公開第2004/041936号の比較例1に記載の方法に準じて製造した。
添加剤-2:ベヘン酸アミド(日本精化社製:BNT-22H)
添加剤-3:エルカ酸アミド(日本精化社製:ニュートロン-S)
[ブレンド前のポリ(3-ヒドロキシアルカノエート)系樹脂の重量平均分子量の測定方法]
ブレンド前の各ポリ(3-ヒドロキシアルカノエート)系樹脂の重量平均分子量は次のように測定した。まず、ポリ(3-ヒドロキシアルカノエート)系樹脂をクロロホルム中にて60℃にて30分静置したのち、更に30分攪拌し溶解させた。その溶液をPTFE製0.45μm孔径ディスポーザーブルフィルターにてろ過した後、そのろ液を用いて、以下の条件でGPC測定を行うことにより重量平均分子量を測定した。結果を表1に示す。
GPC測定装置:日立株式会社製RIモニター(L-3000)
カラム:昭和電工社製K-G(1本)、K-806L(2本)
試料濃度:3mg/ml
遊離液:クロロホルム溶媒
遊離液流量:1.0ml/分
試料注入量:100μL
分析時間:30分
標準試料:ポリスチレン
各実施例又は比較例におけるコンパウンド後のポリ(3-ヒドロキシアルカノエート)系樹脂の重量平均分子量は、ポリ(3-ヒドロキシアルカノエート)系樹脂として後述する各ペレットを使用し、PTFE製0.45μm孔径ディスポーザーブルフィルターにてろ過する前に、遠心分離にて不溶物を除去した以外は、前述したブレンド前の各ポリ(3-ヒドロキシアルカノエート)系樹脂の重量平均分子量の測定方法と同じ方法にて測定した。結果を表2に示す。
前記GPC測定によって得られた分子量分布の横軸を重量平均分子量の対数log、縦軸を累積割合(%)に変換して作成した重量分子量累積分布において、重量平均分子量25万(その対数は5.4)での累積割合(%)の値を、重量平均分子量25万以下の成分の割合(重量%)として読み取った(図1)。但し、添加剤等の影響を除去するため、重量平均分子量が1000以下の部分は除外した。結果を表2に示す。
環状ダイ(外径15mm、内径13.5mm)を接続したφ50mmの単軸押出機のシリンダー温度およびダイ温度をそれぞれ165℃に設定し、樹脂組成物ペレットを投入してチューブ状に押出した。押出したチューブを、環状ダイから100mm離した位置にある40℃の水槽に通した後に引取機で引き取った。成形性の評価は、スクリュー回転数および引取速度を任意に変更し、外径6mm、肉厚0.2mmのチューブが成形可能な最大引取速度をチューブ生産性とした。
作製した樹脂チューブを長さ40mmにカットし、試験片とした。厚さ3mmのSUS板の上に厚さ2mmのゴムシートを敷いたプレートの上に試験片を置き、任意の重さの錘を任意の高さから自由落下させ、その時の破壊結果に基づき、破壊確率50%の落下高さを推定し、これより50%破壊エネルギーを算出した。錘の形状は直方体であり、ストローと錘は並行に接触するように錘を落とした。
表1に記載の樹脂組成となるようにPHA-1を1.00kg、PHA-2を3.25kg、PHA-4を0.75kgブレンドしたものに、添加剤-1を500g、添加剤-2を25g、添加剤-3を25g配合してドライブレンドした。得られた樹脂材料(樹脂混合物)を、シリンダー温度を150℃、ダイ温度を150℃に設定したφ26mmの同方向二軸押出機に投入して押出した。押出した樹脂材料を、40℃の湯を満たした水槽に通してストランドを固化し、ペレタイザーで裁断することにより、樹脂組成物ペレットを得た。
また、得られたチューブを25℃、60%RHの環境で養生し、40mmの長さにカットし、チューブ強度の試験片とした。この試験片を用いて上述のように50%破壊エネルギーを算出した結果、1.02Jであった。
チューブ生産性とチューブ強度の評価結果を表2にまとめた。
配合を表1に示すように変更したこと以外は実施例1と同様にして樹脂組成物ペレットを作製し、実施例1と同様の評価を実施した。結果を表2にまとめた。
一方、比較例1及び2では、各実施例よりも樹脂チューブの生産性に劣っており、得られた樹脂チューブも低強度であった。比較例3は評価条件下では樹脂チューブを成形できなかった。
Claims (10)
- ポリ(3-ヒドロキシアルカノエート)系樹脂を含有する樹脂チューブであって、
前記ポリ(3-ヒドロキシアルカノエート)系樹脂は、3-ヒドロキシブチレート単位と他のヒドロキシアルカノエート単位との共重合体の少なくとも1種を含み、
前記ポリ(3-ヒドロキシアルカノエート)系樹脂は、クロロホルム溶媒を用いたゲルパーミエーションクロマトグラフィー法によるポリスチレン換算の重量平均分子量が30万以上50万以下であり、かつ、分子量分布において重量平均分子量が25万以下の成分が占める割合が15重量%以上40重量%以下である、樹脂チューブ。 - 前記3-ヒドロキシブチレート単位と他のヒドロキシアルカノエート単位との共重合体が、ポリ(3-ヒドロキシブチレート-コ-3-ヒドロキシバレレート)、ポリ(3-ヒドロキシブチレート-コ-3-ヒドロキシバレレート-コ-3-ヒドロキシヘキサノエート)、ポリ(3-ヒドロキシブチレート-コ-3-ヒドロキシヘキサノエート)、及びポリ(3-ヒドロキシブチレート-コ-4-ヒドロキシブチレート)からなる群より選択される1種以上である、請求項1に記載の樹脂チューブ。
- 前記3-ヒドロキシブチレート単位と他のヒドロキシアルカノエート単位との共重合体が、ポリ(3-ヒドロキシブチレート-コ-3-ヒドロキシヘキサノエート)である、請求項1に記載の樹脂チューブ。
- 前記ポリ(3-ヒドロキシアルカノエート)系樹脂が、他のヒドロキシアルカノエート単位の含有割合が1~6モル%である、3-ヒドロキシブチレート単位と他のヒドロキシアルカノエート単位との共重合体(A)、及び、
他のヒドロキシアルカノエート単位の含有割合が24モル%以上である、3-ヒドロキシブチレート単位と他のヒドロキシアルカノエート単位との共重合体(B)を含む、請求項1~3のいずれか1項に記載の樹脂チューブ。 - 前記共重合体(B)は、重量平均分子量が40万以上80万以下である、請求項1~3のいずれか1項に記載の樹脂チューブ。
- 前記ポリ(3-ヒドロキシアルカノエート)系樹脂以外の樹脂の含有量が、前記ポリ(3-ヒドロキシアルカノエート)系樹脂100重量部に対して0重量部以上35重量部以下である、請求項1~3のいずれか1項に記載の樹脂チューブ。
- 結晶核剤及び/又は滑剤をさらに含有する、請求項1~3のいずれか1項に記載の樹脂チューブ。
- 前記ポリ(3-ヒドロキシアルカノエート)系樹脂を含む樹脂成分の合計100重量部に対して、1重量部以上30重量部以下の無機フィラーをさらに含有する、請求項1~3のいずれか1項に記載の樹脂チューブ。
- 前記樹脂チューブの肉厚が0.01mm以上0.6mm以下である、請求項1~3のいずれか1項に記載の樹脂チューブ。
- 前記樹脂チューブの肉厚が0.7mm以上10mm以下である、請求項1~3のいずれか1項に記載の樹脂チューブ。
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WO2024202634A1 (ja) * | 2023-03-30 | 2024-10-03 | 株式会社カネカ | 射出成形用樹脂組成物、射出成形体、及び射出成形体の製造方法 |
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