# US 5,704,947 A · Use of water-soluble polymers and polyhydroxymono- or dicarboxylates in the bleaching of textiles > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,704,947 A - Document ID: US5704947A - Status: Granted - Kind: A - Application number: 08/737,368 - Filed: 1997-01-16 - Granted: 1998-01-06 - Earliest claimed: 1994-05-07 - Inventors: Heribert Kaiser; Christian Nitsch; Claus-Peter Kurzendoerfer; Bernd Wahle; Bernd-Dieter Baehr, deceased; Sylvia Baehr, executrix; Hildegard Van Delden - Web page: https://patentgrep.com/patent/US5704947A ## CPC - D06L 4/12: combined with specific additives - D06L: DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS ## Abstract The deposition of magnesium and calcium silicate in the bleaching of textiles with peroxides is prevented by contacting the textiles with a bleaching composition that is free from phosphorous and contains water-soluble polymers containing sulfonate and carboxylate groups, and polyhydroxymono- or dicarboxylates. ## Claims ### Claim 1 The process of preventing the deposition of magnesium and calcium silicate in the bleaching of textiles with peroxides, comprising contacting said textiles with a bleaching composition that is free from phosphorous and contains water-soluble polymers containing sulfonate and carboxylate groups, and polyhydroxymono- or dicarboxylates. ### Claim 2 (depends on 1) A process as in claim 1 wherein said polymers containing sulfonate and carboxylate groups comprise units of (meth)acrylic acid and salts thereof having the structural formula (A): ##STR8## in which R.sup.1 is hydrogen or a methyl group, X is hydrogen, a metal cation or N--(R.sup.2).sub.4, where R.sup.2 is hydrogen, a C.sub.1-4 alkyl group, a C.sub.1-4 hydroxyalkyl group or a mixture thereof; and units of acrylamidoalkyl or acrylamidoaryl sulfonates having the structural formula (B): ##STR9## in which R.sup.3 is hydrogen or a methyl group, R.sup.4 is hydrogen or a C.sub.1-4 alkyl group, R.sup.3 is a C.sub.1-8 alkylene or C.sub.8-10 arylalkylene group and X is the same as defined for structural formula (A). ### Claim 3 (depends on 1) A process as in claim 1 wherein said polymers containing sulfonate and carboxylate groups comprise 10% to 90% by weight of units derived from (meth)acrylic acid or salts thereof and 90% to 10% by weight of units derived from acrylamidoalkyl or acrylamidoaryl sulfonate units, and have a weight average molecular weight of 3,000 to 25,000. ### Claim 4 (depends on 1) A process as in claim 1 wherein said polymers containing sulfonate and carboxylate groups additionally contain nonionic monomer units selected from vinyl esters, vinyl acetate and substituted acrylamides. ### Claim 5 (depends on 4) A process as in claim 4 wherein said vinyl esters have the structural formula (C): ##STR10## in which R.sup.6 is hydrogen or a methyl group and R.sup.7 is a C.sub.1-6 alkyl group, a C.sub.6-10 aryl group, a C.sub.6-10 arylalkyl group or a group with the structural formula: ##STR11## in which R.sup.8 is hydrogen or a methyl group, R.sup.9 is a C.sub.1-6 alkyl group or hydrogen and n is an integer of 1 to 3; said vinyl acetate has the structural formula (D): ##STR12## and said substituted acrylamides have the structural formula (E): ##STR13## in which R.sup.10 is hydrogen or a methyl group and R.sup.11 and R.sup.12 are each hydrogen, a C.sub.1-6 alkyl group, a C.sub.6-8 cycloalkyl group, a benzyl group or a group with the structural formula: ##STR14## as defined for structural formula (C), with the proviso that R.sup.11 and R.sup.12 are not both hydrogen. ### Claim 6 (depends on 4) A process as in claim 4 wherein said polymers containing sulfonate and carboxylate groups comprise a terpolymer or interpolymer containing between 10% and 84% by weight of units derived from (meth)acrylic acid or salts thereof, 11% to 40% by weight of acrylamidoalkyl or acrylamidoaryl sulfonate units and 5% to 50% by weight of one or more units selected from vinyl esters, vinyl acetate and substituted acrylamides, said polymers having a weight average molecular weight of 3,000 to 25,000. ### Claim 7 (depends on 6) A process as in claim 6 wherein said polymers comprise greater than 10% up to 57% by weight of units of (meth)acrylic acid or salts thereof, 23% by weight of acrylamido-2-methyl propane sulfonic acid and 20% by weight of a vinyl ester, vinyl acetate or alkyl-substituted acrylamide. ### Claim 8 (depends on 6) A process as in claim 6 wherein said polymers have a weight average molecular weight of 4,000 to 8,000. ### Claim 9 (depends on 1) A process as in claim 1 wherein said polyhydroxymono-carboxylates are selected from the group consisting of sodium and potassium carboxylate of ascorbic acid and lactobionic acid. ### Claim 10 (depends on 1) A process as in claim 1 wherein said polyhydroxydicarboxylates are selected from the group consisting of the sodium and potassium carboxylate of glucaric acid, gluconic acid, and tartaric acid. ### Claim 11 (depends on 1) A process as in claim 1 wherein said water-soluble polymers are present in said bleaching composition in an amount of between 0.01% and 0.2% by weight, based on the weight of said bleaching composition. ### Claim 12 (depends on 1) A process as in claim 1 wherein said polymers contain 10% to 90% by weight of units derived from (meth)acrylic acid or salts thereof, and 90% to 10% by weight of acrylamidoalkyl or acrylamidoaryl sulfonate units, said polymers having a weight average molecular weight of 3,000 to 25,000.