KR20220108108A - Stable Anhydrous Laundry Detergent Concentrate and Method for Preparing Same - Google Patents

Abstract

The present invention relates to a stable dry laundry detergent concentrate formulation in solid form.

Description

Stable Anhydrous Laundry Detergent Concentrate and Method for Preparing Same

Most laundry detergent products come in containers with dispensers. They can also come in bulk for refills. These containers are mainly plastic, glass, and cardboard lined with plastic as a water barrier. Most of these laundry detergents on the market are in dilute liquid or gel form. One problem is the packaging. Single-use plastics are ubiquitous, and they are destroying the environment. Only 9% of all plastics are actually recycled, and packaging generates the largest share (~30%) of domestic waste. Packaged products are inefficient for businesses and those who buy them.

Removal of water from laundry detergent formulations eliminates the need for single-use plastic packaging and the accompanying wastes such as packaging waste, product waste and resource waste used to transport water.

Accordingly, there is a need for novel, stable laundry detergent concentrate formulations that meet the needs of consumers while also reducing the amount of waste generated in their production and shipment.

The present application relates to a stable dry laundry detergent concentrate formulation. Stable dry laundry detergent concentrate formulations may be in solid form, such as in the form of tablets, granules, powders, sachets or polymer membranes (PVA, PVP, HPMC, etc.).

In one aspect, a stable dry laundry detergent concentrate formulation in solid form is provided. The formulation comprises an acidic cleaner, a basic cleaner, a surfactant and an enzyme, wherein the weight ratio of enzyme to surfactant is greater than 1:1, or the formulation is polyvinyl alcohol, glycerol or glycol-free, or the formulation is fat acid-free and/or animal fat-free.

In some embodiments, the acidic cleanser is present in an amount of about 15-25 wt % relative to the total weight of the formulation.

In some embodiments, the basic cleaner is present in an amount of about 40-50 wt % relative to the total weight of the formulation.

In some embodiments, the surfactant is present in an amount of about 1-15 wt % relative to the total weight of the formulation.

In some embodiments, the enzyme is present in an amount of about 9-25 wt % relative to the total weight of the formulation.

In some embodiments, the acidic cleaner is selected from citric acid and malic acid.

In some embodiments, the acidic cleaner comprises citric acid.

In some embodiments, the basic cleaner is selected from sodium carbonate, sodium bicarbonate, and any other alkali carbonates and bicarbonates.

In some embodiments, the basic cleaner comprises sodium carbonate.

In some embodiments, the surfactant comprises an anionic surfactant.

In some embodiments, the surfactant comprises a nonionic surfactant.

In some embodiments, surfactants include anionic and nonionic surfactants.

In some embodiments, the anionic surfactant is selected from sodium coco sulfate and sodium lauryl sulfate.

In some embodiments, the anionic surfactant comprises sodium coco sulfate.

In some embodiments, the nonionic surfactant is selected from ethoxylated alcohols and alkyl polyglucosides.

In some embodiments, the nonionic surfactant comprises an ethoxylated alcohol C12-C14 and lauryl and/or myristyl glucoside.

In some embodiments, the enzyme comprises a protease.

In some embodiments, the enzyme comprises subtilisin, amylase, mannanase and pectate lyase.

In some embodiments, the enzyme comprises subtilisin, amylase, mannanase, pectate lyase and cellulase.

In some embodiments, the formulation further comprises a disintegrant.

In some embodiments, the disintegrant is present in an amount of about 1-10 wt % relative to the total weight of the formulation.

In some embodiments, the disintegrant comprises sodium starch glycolate.

In some embodiments, the disintegrant comprises sodium starch glycolate and microcrystalline cellulose.

In some embodiments, the formulation further comprises a flow aid.

In some embodiments, the flow aid comprises hydrated silica.

In some embodiments, the formulation further comprises a filler.

In some embodiments, the filler comprises sodium silicate.

In some embodiments, the formulation, when dissolved in an appropriate amount of water, has a pH of about 7.0-9.0.

In some embodiments, the formulation is in the form of a tablet.

In some embodiments, the weight of the tablet is about 6.2-6.8 g per tablet.

In another aspect, a method of making a laundry detergent tablet is provided. The method includes uniformly blending the ingredients for a laundry detergent formulation disclosed herein to form a mixture, and compressing the mixture to form a tablet.

The present invention relates to a stable dry laundry detergent concentrate formulation in solid form. The present inventors have discovered a solid formulation that is good for the environment and is also effective for cleaning. Advantages of this dry solid form over conventional liquid cleansers include chemical stability, reduced packaging, and convenience to the consumer. Stable dry laundry detergent concentrate formulations may be in the form of tablets, granules, powders, sachets or polymer membranes (PVA, PVP, HPMC, etc.).

As used herein, the singular forms of "the indefinite article" and "the definite article" include plural referents, unless the context clearly dictates otherwise. Thus, for example, reference to "a preservative booster" includes a single kind of preservative booster or two or more different kinds of preservative boosters.

As used herein, "about" means within an acceptable error range for a particular value as determined by one of ordinary skill in the art, which will depend in part on how that value is measured or determined (i.e., limitations of the measuring system). For example, "about" can mean within one or more than one standard deviation, according to the practice of the art. Where particular values are recited in the present application and claims, unless otherwise stated, the term "about" means within an acceptable margin of error for the particular value. When defining the value of a specified item, number, percentage or period, the term “about” refers to a range of plus or minus 10% of the value of the specified item, percentage, parameter or period.

As used herein, the term “anhydrous” means about 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3% by weight relative to the weight of the concentrated formulation. , a stable dry laundry detergent concentrate formulation comprising less than 2% or less than 1% water by weight.

As used herein, the term “substantially free of fatty acids” means 10%, 9%, 8%, 7%, 6%, 5%, 4% by weight relative to the weight of the concentrated formulation. %, 3%, 2% or 1% by weight of a fatty acid (or salt thereof).

As used herein, the terms “polyvinyl alcohol-free,” “glycerol-free,” “glycol-free,” “fatty acid-free,” and “animal fat-free,” refer to concentrated formulations. less than 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2% or 1% by weight of polyvinyl alcohol, glycerol, refers to a stable dry laundry detergent concentrate comprising glycol, a fatty acid (or a salt thereof) and an animal fat (such as tallow) (or a salt thereof), respectively.

As used herein, the term "softening agent" may be used interchangeably with a chelating agent. For example, citric acid and ethylenediaminetetraacetic acid (EDTA) are examples of water softeners.

Some ingredients may have multiple functions. However, when two or more components defined based on their function are included in the formulations disclosed herein, these components differ from each other in their chemical structure. For example, citric acid can be a water softener and also an acid cleaner, but when both a water softener and an acid cleaner are used in the description of a formulation, they are intended to refer to ingredients that differ in their chemical structure.

The term “comprising” includes embodiments of “consisting of” or “consisting essentially of.

A stable dry laundry detergent concentrate formulation in solid form may comprise an acidic cleaner, a basic cleaner, a surfactant and an enzyme, wherein the enzyme to surfactant weight ratio is greater than 1:1, or the formulation is polyvinyl alcohol, glycerol or glycol-free, or the formulation is fatty acid-free and/or animal fat-free.

In some embodiments, the stable dry laundry detergent concentrate formulation may further comprise a disintegrant.

In some embodiments, the stable dry laundry detergent concentrate formulation may further comprise a flow aid.

In some embodiments, the stable dry laundry detergent concentrate formulation may further comprise a filler.

In each of the above aspects or embodiments, the laundry detergent concentrate formulation may further comprise a preservative and optionally a preservative booster.

In each of the above aspects or embodiments, the laundry detergent concentrate formulation may further comprise a dye/colorant and optionally a fragrance.

The amount of acidic cleaner in the formulation may range from about 15% to about 25% by weight relative to the total weight of the formulation. The acidic cleaner may be citric acid and/or malic acid.

The amount of basic cleaner in the formulation may range from about 40% to about 50% by weight relative to the total weight of the formulation. The basic cleaner may be sodium carbonate, sodium bicarbonate and/or any other alkali carbonate.

The amount of surfactant in the formulation can range from about 1% to about 15% by weight relative to the total weight of the formulation. Surfactants include natural or synthetic surfactants, such as anionic, nonionic, amphoteric, zwitterionic or cationic surfactants, such as anionic and nonionic surfactants, further such as sodium coco sulfate, ethoxylated alcohols ( For example, an ethoxylated alcohol C(10-12)-C(14-16) with 4-8 molar ethoxylation, e.g. Clariant Genapol LA 060 (ethoxylated alcohol C12-C16) w/6 6 molar ethoxylation , ethoxylated alcohol C8-C10 6-8 moles of EO, etc.), sodium lauryl sulfate and alkyl polyglucosides (such as lauryl glucoside, caprylyl/myristyl glucoside, caprylyl/decyl glucoside) seed) may be a surfactant selected from

The amount of enzyme in the formulation may range from about 9% to about 25% by weight relative to the total weight of the formulation. Enzymes may include proteases (eg, subtilisin), amylases, mannanases, pectate lyases, and cellulases.

In some embodiments, the amount (eg, weight) of the enzyme is greater than the amount (eg, by weight) of the surfactant present in the formulation. Since enzymes are made biologically and biodegrade very readily, while surfactants take much longer to biodegrade, it would be desirable to have more enzymes than surfactants in the formulation. The enzyme also targets each type of stain better than using a surfactant. By having high levels of the enzyme, the overall dose size can be reduced.

The amount of disintegrant in the formulation may range from about 1% to about 10% by weight relative to the total weight of the formulation. The disintegrant may include sodium starch glycolate and/or microcrystalline cellulose. Other exemplary disintegrants include croscarmellose sodium, starch, pregelatinized starch, crospovidone, guar gum. Formulations disclosed herein comprising a disintegrant, such as sodium starch glycolate and/or microcrystalline cellulose, are the same, but with cold water (40-60° F.) than formulations that do not contain sodium starch glycolate and/or microcrystalline cellulose. ) can be more completely dissolved in

The amount of flow aid in the formulation is less than 1% by weight relative to the total weight of the formulation. For example, it can range from about 0.1% to about 0.7% by weight relative to the total weight of the formulation. Flow aids may include hydrated silica, medium chain triglycerides with 2 or 3 fatty acids with aliphatic tails of 6-12 carbon atoms. Hydrated silica can also function as a desiccant.

The amount of filler in the formulation may range from about 2% to 6% by weight relative to the total weight of the formulation. Exemplary fillers may be selected from dextrose, dextrin, starch, inulin and sodium silicate.

The pH of the formulation dissolved in an appropriate amount of water may range from about 7.0 to about 9.0.

The formulations may further comprise natural fragrances (eg, essential oils) and/or synthetic fragrances, which may be in the form of oils, crystals, powders, granules and encapsulates, and fragrances, which may be perfumes. The fragrance may be selected from fragrance clean basil.

The formulation may further comprise a dye or colorant, which may be any Food, Drug and Cosmetic (FD&C) approved dye and colorant.

The stable dry laundry detergent formulation may be in the form of a tablet. For example, the tablets may be of any size such that one tablet is sufficient to wash clothes per load. In some embodiments, the tablet ranges from about 6.2-6.8 g per tablet.

In order to avoid foaming during storage when the formulation contains both acidic and basic cleaners, the tablet may be of sufficient hardness, and/or the tablet may have a desiccant such as hydrated silica or any other known to absorb moisture. contains an active agent.

Method for making stable anhydrous laundry detergent tablets

Stable dry laundry detergent tablets may be prepared using any suitable method. Stable dry laundry detergent tablets can be prepared using direct compression or wet granulation processes. For these applications, direct compression is most preferred. The term direct compression (or direct compaction) is used to define a process for directly compressing tablets from a powdered mixture of ingredients to hard compaction without using a wet granulation process. The powder is uniformly blended using a blender (ribbon blender, V-blender, paddle blender, drum mixing). The powder blender is then charged into the hopper of the tablet press. As the tablets are compressed and exit the tablet press, the desired weight, compression ton, and hardness of the tablet are set.

How to Use Stable Anhydrous Laundry Detergent Tablets

In one embodiment, the present invention provides a method of using any tablet described herein comprising (1) placing the tablet in a container of a washing machine reserved for detergent, (2) turning on the washing machine. includes

Laundry detergent tablets may be stored in any suitable container, such as, but not limited to, a plastic, glass, aluminum, ceramic or acrylic container. The container may contain a desiccant. The container may be reusable, and new tablets may be refilled as needed.

Example

Example 1

Laundry detergent tablets were prepared using the following ingredients:

Table 1

One tablet, when dissolved in an appropriate amount of water, has a pH of 7.0-9.0. The weight of the tablet is 6.2-6.8 g per tablet.

The washing performance of the laundry detergent formulations described herein are tested according to industry accepted protocols (e.g., standard guides for evaluating stain removal performance in home laundry, standard practices for obtaining spectroscopic data for object-color evaluation, and laundry (Guidelines for anti-redeposition properties of products) are tested under cold water conditions, pre-stained stains are washed, and before and after readings are taken with a spectrophotometer. The cleaning efficiency of the laundry detergent formulations described herein is satisfactory and comparable to other competing products on the market in terms of stain removal, color retention and/or soil redeposition.

Claims (35)

A stable dry laundry detergent concentrate formulation in solid form comprising an acidic cleaner, a basic cleaner, a surfactant and an enzyme, wherein the enzyme to surfactant weight ratio is greater than 1:1, or the formulation is polyvinyl alcohol, glycerol or glycol-free or wherein the formulation is fatty acid-free and/or animal fat-free. 2. The stable dry laundry detergent concentrate formulation of claim 1, wherein the weight ratio of enzyme to surfactant is greater than 1:1. The stable dry laundry detergent concentrate formulation of claim 1 , wherein the formulation is polyvinyl alcohol, glycerol or glycol-free. The stable dry laundry detergent concentrate formulation of claim 1 , wherein the formulation is fatty acid-free and/or animal fat-free. 5. The stable dry laundry detergent concentrate formulation according to any one of claims 1 to 4, wherein the acidic cleanser is present in an amount of about 15-25 wt % relative to the total weight of the formulation. 6. The stable dry laundry detergent concentrate formulation according to any one of claims 1 to 5, wherein the basic cleaner is present in an amount of about 40-50 wt % relative to the total weight of the formulation. 7. The stable dry laundry detergent concentrate formulation according to any one of claims 1 to 6, wherein the surfactant is present in an amount of about 1-15 wt % relative to the total weight of the formulation. 8. The stable dry laundry detergent concentrate formulation according to any one of claims 1 to 7, wherein the enzyme is present in an amount of about 9-25 wt% with respect to the total weight of the formulation. 9. A stable dry laundry detergent concentrate formulation according to any one of claims 1 to 8, wherein the acidic cleaner is selected from citric acid and malic acid. 10. A stable dry laundry detergent concentrate formulation according to any one of claims 1 to 9, wherein the acidic cleaner comprises citric acid. 11. A stable dry laundry detergent concentrate formulation according to any one of claims 1 to 10, wherein the basic cleaner is selected from sodium carbonate, sodium bicarbonate, and any other alkali carbonates and bicarbonates. 12. A stable dry laundry detergent concentrate formulation according to any one of claims 1 to 11, wherein the basic cleaner comprises sodium carbonate. 13. The stable dry laundry detergent concentrate formulation of any one of claims 1-12, wherein the surfactant comprises an anionic surfactant. 13. A stable dry laundry detergent concentrate formulation according to any one of claims 1 to 12, wherein the surfactant comprises a nonionic surfactant. 13. The stable dry laundry detergent concentrate formulation according to any one of claims 1 to 12, wherein the surfactant comprises anionic and nonionic surfactants. 16. The stable dry laundry detergent concentrate formulation according to any one of claims 1 to 13 and 15, wherein the anionic surfactant is selected from sodium coco sulfate and sodium lauryl sulfate. 17. The stable dry laundry detergent concentrate formulation of claim 16, wherein the anionic surfactant comprises sodium coco sulfate. 16. The stable dry laundry detergent concentrate formulation according to any one of claims 1 to 12, 14 or 15, wherein the nonionic surfactant is selected from ethoxylated alcohols and alkyl polyglucosides. 19. The stable dry laundry detergent concentrate formulation of claim 18, wherein the nonionic surfactant comprises an ethoxylated alcohol C12-C14 and lauryl and/or myristyl glucoside. 20. The stable dry laundry detergent concentrate formulation of any one of claims 1-19, wherein the enzyme comprises a protease. 21. The stable dry laundry detergent concentrate formulation according to any one of claims 1 to 20, wherein the enzymes comprise proteases, amylases, mannanases and pectate lyases. 22. The stable dry laundry detergent concentrate formulation of any one of claims 1-21, wherein the enzymes comprise proteases, amylases, mannanases, pectate lyases and cellulases. 23. The stable dry laundry detergent concentrate formulation of any one of claims 20-22, wherein the protease comprises subtilisin. 24. The stable dry laundry detergent concentrate formulation of any one of claims 1 to 23, wherein the formulation further comprises a disintegrant. 25. The stable dry laundry detergent concentrate formulation of claim 24, wherein the disintegrant is present in an amount of about 1-10 wt % relative to the total weight of the formulation. 26. The stable dry laundry detergent concentrate formulation of claim 24 or 25, wherein the disintegrant comprises sodium starch glycolate. 27. The stable dry laundry detergent concentrate formulation of any one of claims 24-26, wherein the disintegrant comprises sodium starch glycolate and microcrystalline cellulose. 28. The stable dry laundry detergent concentrate formulation of any one of claims 1-27, wherein the formulation further comprises a flow aid. 29. The stable dry laundry detergent concentrate formulation of claim 28, wherein the flow aid comprises hydrated silica. 30. The stable dry laundry detergent concentrate formulation of any one of claims 1-29, wherein the formulation further comprises a filler. 31. The stable dry laundry detergent concentrate formulation of claim 30, wherein the filler comprises sodium silicate. 32. The stable dry laundry detergent concentrate formulation of any one of claims 1-31, wherein the formulation, when dissolved in an appropriate amount of water, has a pH of about 7.0-9.0. 33. The stable dry laundry detergent concentrate formulation according to any one of claims 1 to 32, wherein the formulation is in the form of a tablet. 34. The stable dry laundry detergent concentrate formulation of claim 33, wherein the tablet weighs about 6.2-6.8 g per tablet. 35. A method according to any one of claims 33 or 34 comprising uniformly blending the ingredients for a laundry detergent formulation according to any one of claims 1 to 31 to form a mixture and compressing the mixture to form a tablet. A process for the manufacture of tablets.