# US 5,574,088 A · Increasing the resistance of fiber material to oxidizing agents > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,574,088 A - Document ID: US5574088A - Status: Granted - Kind: A - Application number: 08/465,439 - Filed: 1995-06-05 - Granted: 1996-11-12 - Earliest claimed: 1994-11-24 - Assignees: Tichromatic Carpet Inc. - Inventors: Yassin Elgarhy - Web page: https://patentgrep.com/patent/US5574088A ## CPC - D06P 3/241: {using acid dyes} - C08L 61/28: with melamine - C08L 83/08: containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen - D06M 11/155: Halides of elements of Groups 2 or 12 of the Periodic Table - D06M 11/17: Halides of elements of Groups 3 or 13 of the Periodic Table - D06M 13/144: Alcohols; Metal alcoholates (D06M13/11 takes precedence) - D06M 13/325: Amines - D06M 15/423: Amino-aldehyde resins - D06M 15/6436: {containing amino groups} - D06P 1/5292: {containing Si-atoms} - D06P 1/58: together with other synthetic macromolecular substances - D06P 1/67341: {of elements different from the alkaline or alkaline-earth metals or with anions containing those elements (D06P1/67383 takes precedence)} - D06P 1/6735: {of alkaline or alkaline-earth metals with anions different from those provided for in D06P1/67341} - D06P 3/521: {using acid dyes} - D21C 9/10: Bleaching {; Apparatus therefor} - D21H 11/20: Chemically or biochemically modified fibres - D06M 2101/32: Polyesters - D06M 2101/34: Polyamides - D21C 9/002: {by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives} - D21C 9/163: {with peroxides} - Y10T 442/2549: Coating or impregnation is chemically inert or of stated nonreactance - Y10T 442/2557: Oxygen or ozone resistant - D06P: DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - D06M: TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS - D21C: PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR - D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A composition for increasing the resistance of polyamide fibers or polyester fibers to oxidizing agents comprising an organosiloxane modified with amino groups, melamine formaldehyde resin, a catalyst for complexing the melamine formaldehyde resin and water. The composition is used by applying it to the fibers so the fibers absorb the composition, and then drying and curing the composition on the fibers. The composition is employed to treat a polyester or polyamide felt employed to convey wood pulp which is to be bleached, prior to paper making operations, treatment of the felt with the composition significantly lengthens the useful life of the felt, exposed to bleaching chemicals. ## Claims ### Claim 1 In a process of chemically oxidizing cellulosic wood pulp prior to manufacture of paper from the wood pulp in which wood pulp is supported on a porous, self-supporting carrier sheet of polyamide or polyester fibers and the wood pulp and the carrier sheet are exposed to a chemical oxidizing agent for bleaching the wood pulp to increase the whiteness or brightness of paper subsequently produced from the bleached wood pulp and in which the polyamide or polyester fibers of the carrier sheet are deleteriously affected by the oxidizing agent, the improvement wherein said carrier sheet is pretreated with a composition which increases the resistance of the polyamide or polyester fibers of the carrier sheet to the oxidizing agent, said composition comprising a) an organosiloxane modified with amino groups, b) a melamine formaldehyde resin, c) a catalyst for complexing said melamine formaldehyde resin; and d) water. ### Claim 2 (depends on 1) A process according to claim 1, wherein said carrier sheet is of polyamide fibers; and said oxidizing agent is a bleaching chemical selected from hydrogen peroxide or sodium hypochlorite. ### Claim 3 (depends on 2) A process according to claim 2, wherein said organosiloxane is emulsified in said composition and said organosiloxane is of formula (I): ##STR4## wherein each R, which may be the same or different is lower alkyl of 1 to 4 carbon atoms or phenyl; each R.sub.1 is lower alkyl of 1 to 4 carbon atoms, phenyl or is selected from amino or lower alkoxy of 1 to 4 carbon atoms; R.sub.2 and R.sub.3, which may be the same or different are each selected from lower alkyl of 1 to 4 carbon atoms, phenyl, lower alkoxy of 1 to 4 carbon atoms or amino, provided that at least one of R.sub.1, R.sub.2 and R.sub.3 comprise amino and m and n are selected such that organosiloxane is a fluid having a viscosity at 25.degree. C. of from 0.95 to 1.05. ### Claim 4 (depends on 3) A process according to claim 3, wherein each R is methyl, and R.sub.1, R.sub.2 and R.sub.3 are selected from amino and lower alkoxy of 1 to 4 carbon atoms. ### Claim 5 (depends on 2) A process according to claim 2, wherein said melamine formaldehyde resin is in a concentration of 30-150 g/l of said composition. ### Claim 6 (depends on 2) A process according to claim 2, wherein said melamine formaldehyde resin is methylated methylol melamine formaldehyde. ### Claim 7 (depends on 4) A process according to claim 4, wherein said organosiloxane is present as an emulsion having a solids content of organosiloxane of 20-50% by weight. ### Claim 8 (depends on 4) A process according to claim 4, wherein the organosiloxane is present in a concentration of 10-150 g/l of said composition. ### Claim 9 (depends on 2) A process according to claim 2, wherein said catalyst is selected from the group consisting of salts of alkaline-earth metals, aluminum chloride solution and a solution of magnesium chloride and aluminum chloride. ### Claim 10 (depends on 9) A process according to claim 9, wherein the catalyst is present in a concentration of 5-30 g/l of said composition. ### Claim 11 (depends on 2) A process according to claim 2, wherein said composition further comprises the acid dye Acid Yellow, Acid Red or Acid Blue. ### Claim 12 (depends on 11) A process according to claim 11, wherein said Acid Yellow dye is selected from the group consisting of Acid Yellow 19, 15, 169 and 219; wherein said Acid Red dye is selected from the group consisting of Acid Red 42, 57, 337 and 361; and wherein said Acid Blue dye is selected from the group consisting Acid Blue 25, 27, 72, 258, 277 and 294. ### Claim 13 (depends on 1) A process according to claim 1, wherein said composition further comprises a fluorochemical. ### Claim 14 (depends on 13) A process according to claim 13, wherein the fluorochemical is present in said composition in a concentration of 5-50 g/l of said composition. ### Claim 15 (depends on 2) A process according to claim 2, wherein said composition has a pH of 7 or less. ### Claim 16 (depends on 1) A process according to claim 1, wherein said carrier sheet is a woven felt of 3 to 15 denier polyamide fibers, and having a weight of 1000 to 1500 g/m.sup.2. ### Claim 17 (depends on 16) A process according to claim 16, wherein said felt has a length of at least 40 meters and a thickness of at least 2 mm. ### Claim 18 (depends on 17) A process according to claim 17, wherein said length is 45 to 135 meters and said thickness is 3 to 5 mm. ### Claim 19 (depends on 18) A process according to claim 18, wherein said felt has a useful working life after 180 days continuous operation. ### Claim 20 In a process of chemically bleaching cellulosic wood pulp prior to manufacture of paper from the wood pulp in which the wood pulp is supported on a porous, self-supporting polyamide fiber carrier sheet, and the wood pulp and the carrier sheet are exposed to a chemical bleaching agent for bleaching the wood pulp to increase the whiteness or brightness of paper subsequently produced from the bleached wood pulp, said carrier sheet having a length of at least 40 meters and a thickness of at least 2 mm, and in which the polyamide fibers of the carrier sheet are deleteriously affected by the chemical bleaching agent, the improvement wherein the carrier sheet is pretreated with a composition which increases the resistance of the polyamide fibers of the carrier sheet to the chemical bleaching agent thereby extending the working life of the carrier sheet, said composition consisting essentially of: a) an organosiloxane modified with amino groups, b) a melamine formaldehyde resin, c) a catalyst for complexing said melamine formaldehyde resin; and d) water. ### Claim 21 (depends on 20) A process according to claim 20, wherein said length is 45 to 135 meters and said thickness is 3 to 5 mm. ### Claim 22 (depends on 21) A process according to claim 21, wherein said carrier sheet is a woven felt of 3 to 15 denier polyamide fibers, and having a weight of 1000 to 1500 g/m.sup.2. ### Claim 23 (depends on 22) A process according to claim 22, wherein said felt has a useful working life after 180 days continuous operation. ### Claim 24 (depends on 1) A process according to claim 1, wherein said composition further comprises an antiprecipitant dispersing agent. ### Claim 25 (depends on 24) A process according to claim 24, wherein said antiprecipitant dispersing agent comprises ethoxylated fatty amine or ethoxylated fatty alcohol.