Preparation of finely divided mixtures of amphiphilic polymers and polycarboxylates and use thereof

Abstract

A process for preparing finely divided mixtures of amphiphilic polymers and polycarboxylates, which comprises mixing(a) aqueous dispersions or colloidal aqueous solutions with at least one amphiphilic polymer, and(b) an aqueous solution of a polycarboxylatein a weight ratio of (a):(b) of from 1:1 to 1:20, each based on the solids, or dispersing at least one amphiphilic polymer in an aqueous solution of a polycarboxylate, and spray-drying the dispersions thus obtainable to form finely divided polymer mixtures, use of the finely divided polymer mixtures as ingredient of detergent and as laundry aftertreatment, and finely divided polymer mixtures having a particle size from 20 .mu.m to 3 mm prepared by the above-indicated process.

Description

Claims

1. A process for preparing finely divided mixtures of amphiphilic polymers and polycarboxylates, which process comprises mixing

(a) an aqueous dispersion or colloidal aqueous solution of at least one amphiphilic polymer, with

(b) an aqueous solution of a polycarboxylate in a weight ratio of (a):(b) of from 1:1 to 1:20, each based on the solids, and spray-drying the aqueous dispersion mixture thus obtained to form a finely divided polymer mixture.

2. A process as claimed in claim 1, wherein the amphiphilic polymers used are polyesters having a molecular mass M.sub.W of from 4000 to 60000 where the hydrophilic units are polyethylene glycol, block copolymers of ethylene oxide and propylene oxide and/or butylene oxide having molecular masses M.sub.n of from 500 to 8000 and/or sulfo-containing monobasic or polybasic carboxylic acids and the hydrophobic units are condensation blocks of aromatic polybasic carboxylic acids, optionally in combination with aliphatic polybasic carboxylic acids, condensed with C.sub.2 -C.sub.4 -alkylene glycols and/or trihydric or more highly hydric alcohols.

3. A finely divided polymeric mixture having a particle size of from 20 .mu.m to 3 mm, prepared by the process of claim 2, said finely divided mixture being free-flowing at room temperature, storage-stable and readily dispersible in water.

4. A process as claimed in claim 1, wherein the amphiphilic polymers used are polyesters containing units of

(1) ethylene terephthalate, and

(2) polyoxyethylene terephthalate of polyethylene glycols having molecular masses Mn of from 1000 to 7500

in a weight ratio of (1):(2) of from 1:1 to 1:25.

5. A finely divided polymeric mixture having a particle size of from 20 .mu.m to 3 mm, prepared by the process of claim 4, said finely divided mixture being free-flowing at room temperature, storage-stable and readily dispersible in water.

6. A process as claimed in claim 1, wherein the amphiphilic polymers used are polyesters which are obtained by condensation of

(1) carboxylic acids having at least 2 carboxyl groups, their esters, anhydrides or mixtures, with

(2) at least dihydric alcohols and/or addition products of from 1 to 5 mol of at least one alkylene oxide having 2 or 3 carbon atoms with 1 mol of an at least dihydric alcohol or mixtures, and

(3) water-soluble addition products of from 5 to 80 mol of at least one alkylene oxide with 1 mol of C.sub.8 -C.sub.24 -alcohols, C.sub.8 -C.sub.18 -alkylphenols or C.sub.8 -C.sub.24 -alkylamines in a molar ratio of (1):(2):(3) of 100:(from 25 to 2500):(from 5 to 110) at temperatures of at least 120.degree. C. to molecular masses M.sub.W from 4000 to 50000.

7. A finely divided polymeric mixture having a particle size of from 20 .mu.m to 3 mm, prepared by the process of claim 6, said finely divided mixture being free-flowing at room temperature, storage-stable and readily dispersible in water.

8. A process as claimed in claim 1, wherein the amphiphilic polymers used are polyesters containing blocks of

(1) ester units of polyalkylene glycols having a molecular mass of from 500 to 7500 and aliphatic dicarboxylic acids and/or monohydroxycarboxylic acids, and

(2) ester units of aromatic dicarboxylic acids and polyhydric alcohols

and having molecular masses M.sub.W from 4000 to 25000.

9. A finely divided polymeric mixture having a particle size of from 20 .mu.m to 3 mm, prepared by the process of claim 8, said finely divided mixture being free-flowing at room temperature, storage-stable and readily dispersible in water.

10. A process as claimed in claim 1, wherein (b) comprises polymers of monoethylenically unsaturated carboxylic acids, polyamidocarboxylates, polyestercarboxylates, polyacetalcarboxylates, graft polymers of monoethylenically unsaturated mono- and/or dicarboxylic acids on mono- and/or polysaccharides or polyalkylene oxides, polymer of citric acid, oxidized starches or mixtures thereof.

11. A finely divided polymeric mixture having a particle size of from 20 .mu.m to 3 mm, prepared by the process of claim 10, said finely divided mixture being free-flowing at room temperature, storage-stable and readily dispersible in water.

12. A process as claimed in claim 1, wherein (b) comprises copolymers of acrylic acid and maleic acid, oligomaleic acid, polyaspartic acid, polymer of citric acid, monooxidized starches or mixtures thereof.

13. A finely divided polymeric mixture having a particle size of from 20 .mu.m to 3 mm, prepared by the process of claim 12, said finely divided mixture being free-flowing at room temperature, storage-stable and readily dispersible in water.

14. A finely divided polymer mixture having a particle size of from 20 .mu.m to 3 mm, prepared by the process of claim 1, said finely divided polymeric mixture being free-flowing at room temperature, storage-stable and readily dispersible in water.

15. A process for preparing finely divided mixtures of amphiphilic polymers and polycarboxylates, which comprises dispersing at least one amphiphilic polymer in an aqueous solution of a polycarboxylate, and spray-drying the aqueous dispersion thus obtained to form a finely divided polymer mixture.

16. A process as claimed in claim 15, wherein the amphiphilic polymers used are polyesters having a molecular mass M.sub.W of from 4000 to 60000 where the hydrophilic units are polyethylene glycol, block copolymers of ethylene oxide and propylene oxide and/or butylene oxide having molecular masses M.sub.n of from 500 to 8000 and/or sulfo-containing monobasic or polybasic carboxylic acids and the hydrophobic units are condensation blocks of aromatic polybasic carboxylic acids, optionally in combination with aliphatic polybasic carboxylic acids, condensed with C.sub.2 -C.sub.4 -alkylene glycols and/or trihydric or more highly hydric alcohols.

17. A process as claimed in claim 15, wherein the amphiphilic polymers used are polyesters containing units of

(1) ethylene terephthalate, and

(2) polyoxyethylene terephthalate of polyethylene glycols having molecular masses Mn of from 1000 to 7500

in a weight ratio of (1):(2) of from 1:1 to 1:25.

18. A process as claimed in claim 15, wherein the amphiphilic polymers used are polyesters which are obtained by condensation of

(1) carboxylic acids having at least 2 carboxyl groups, their esters, anhydrides or mixtures, with

(2) at least dihydric alcohols and/or addition products of from 1 to 5 mol of at least one alkylene oxide having 2 or 3 carbon atoms with 1 mol of an at least dihydric alcohol or mixtures, and

(3) water-soluble addition products of from 5 to 80 mol of at least one alkylene oxide with 1 mol of C.sub.8 -C.sub.24 -alcohols, C.sub.8 -C.sub.18 -alkylphenols or C.sub.8 -C.sub.24 -alkylamines

in a molar ratio of (1):(2):(3) of 100:(from 25 to 2500):(from 5 to 110) at temperatures of at least 120.degree. C. to molecular masses M.sub.W from 4000 to 50000.

19. A process as claimed in claim 15, wherein the amphiphilic polymers used are polyesters containing blocks of

(1) ester units of polyalkylene glycols having a molecular mass of from 500 to 7500 and aliphatic dicarboxylic acids and/or monohydroxycarboxylic acids, and

(2) ester units of aromatic dicarboxylic acids and polyhydric alcohols

and having molecular masses M.sub.W from 4000 to 25000.

20. A process as claimed in claim 15, wherein said polycarboxylate comprises polymers of monoethylenically unsaturated carboxylic acids, polyamidocarboxylates, polyestercarboxylates, polyacetalcarboxylates, graft polymers of monethylenically unsaturated mono- and/or dicarboxylic acids on mono- and/or polysaccharides or polyalkylene oxides, polymer of citric acid, oxidized starches or mixtures thereof.

21. A process as claimed in claim 15, wherein said polycarboxylate comprises copolymers of acrylic acid and maleic acid, oligomaleic acid, polyaspartic acid, polymer of citric acid, monooxidized starches or mixtures thereof.

22. A finely divided polymeric mixture having a particle size of from 20 .mu.m to 3 mm, prepared by the process of claim 15, said finely divided mixture being free-flowing at room temperature, storage-stable and readily dispersible in water.