# US 5,348,700 A · Polyester flat and split yarn > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,348,700 A - Document ID: US5348700A - Status: Granted - Kind: A - Application number: 08/048,182 - Filed: 1993-04-20 - Granted: 1994-09-20 - Earliest claimed: 1992-05-12 - Assignees: Showa Highpolymer Co., Ltd. - Inventors: Akira Nakamura; Ryosuke Kamei; Takeshi Takahashi; Tetuya Takahashi; Shigenori Terazono; Eiichiro Takiyama - Web page: https://patentgrep.com/patent/US5348700A ## CPC - C08J 9/18: by impregnating polymer particles with the blowing agent - B32B 27/10: of paper or cardboard - B32B 27/36: comprising polyesters - C08G 18/0895: {Manufacture of polymers by continuous processes (C08G18/0838 takes precedence)} - C08G 18/4236: {containing only aliphatic groups} - C08G 18/4238: {derived from dicarboxylic acids and dialcohols} - C08G 18/4241: {from dicarboxylic acids and dialcohols in combination with polycarboxylic acids and/or polyhydroxy compounds which are at least trifunctional} - C08G 18/4283: {Hydroxycarboxylic acid or ester} - C08G 18/4286: {prepared from a combination of hydroxycarboxylic acids and/or lactones with polycarboxylic acids or ester forming derivatives thereof and polyhydroxy compounds} - C08G 18/4854: {Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group} - C08G 63/16: Dicarboxylic acids and dihydroxy compounds - C08G 63/20: Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups - C08G 63/916: {Dicarboxylic acids and dihydroxy compounds} - C08J 5/18: Manufacture of films or sheets - C08J 9/04: using blowing gases generated by a previously added blowing agent - C08J 9/06: by a chemical blowing agent - C08J 9/14: organic - D01D 5/42: by cutting films into narrow ribbons or filaments or by fibrillation of films {or filaments} - D01F 6/625: {derived from hydroxy-carboxylic acids, e.g. lactones} - D01F 6/70: from polyurethanes - C08G 2101/00: Manufacture of cellular products - C08G 2110/0008: flexible - C08G 2230/00: Compositions for preparing biodegradable polymers - C08G 2250/00: Compositions for preparing crystalline polymers - C08J 2201/03: Extrusion of the foamable blend - C08J 2367/00: Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers - C08J 2367/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) - C08J 2375/06: from polyesters - Y10T 428/2969: Polyamide, polyimide or polyester - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS - D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Flat and split yarn formed by extrusion molding, comprising as a main component an aliphatic polyester having a melt viscosity of 2.0.times.10.sup.3 -4.0.times.10.sup.4 poises at a temperature of 190.degree. C. and a shear rate of 100 sec.sup.-1, and having a melting point of 70.degree.-190.degree. C. The present invention provides flat and split yarn having excellent in heat stability and mechanical strength as well as having biodegradability. ## Claims ### Claim 1 A polyester flat and split yarn comprising an aliphatic polyester having a melt viscosity of 2.0.times.10.sup.3 -4.0.times.10.sup.4 poises at a temperature of 190.degree. C. and a shear rate of 100 sec.sup.-1 and having a melting point of 70.degree.-190.degree. C., wherein said aliphatic polyester is obtained from ingredients consisting essentially of diisocyanate and a prepolymer in a molten state by adding from 0.1 to 5 parts by weight of diisocyanate to 100 parts by weight of a prepolymer in a molten state, wherein said prepolymer is obtained from a reaction of at least an aliphatic glycol and an aliphatic dicarboxylic acid, wherein the reaction includes (a) succinic acid, or its anhydride, reacted with 1,4-butanediol, (b) succinic acid, adipic acid, or their anhydride, reacted with 1,4-butanediol, or (c) succinic acid, or its anhydride, reacted with ethylene glycol, and has a number-average molecular weight of at least 10,000. ### Claim 2 (depends on 1) The flat and split yarn as claimed in claim 1 wherein the aliphatic polyester has a repeated chain structure in which a polyester prepolymer having a number-average molecular weight (Mn) of 10,000 or more and obtained by reacting an aliphatic glycol, aliphatic dicarboxylic acid and, as the third component, at least one polyfunctional component selected from the group consisting of trifunctional or tetrafunctional polyols, oxycarboxylic acids and polybasic carboxylic acids or acid anhydrides thereof, is combined through urethane bonds. ### Claim 3 (depends on 2) The flat and split yarn as claimed in claim 2 wherein the polyester prepolymer contains one or more compounds selected from the group consisting of trimethylol propane, glycerin and pentaerythritol as the trifunctional or tetrafunctional polyol of the third component. ### Claim 4 (depends on 2) The flat and split yarn as claimed in claim 2 wherein the polyester prepolymer contains one or more compounds selected from the group consisting of malic acid, citric acid and tartaric acid as the trifunctional or tetrafunctional oxycarboxylic acid of the third component. ### Claim 5 (depends on 2) The flat and split yarn as claimed in claim 2 wherein the polyester prepolymer contains one or more compounds selected from the group consisting of trimesic acid, propane tricarboxylic acid, trimellitic anhydride, pyromellitic anhydride, benzophenone tetracarboxylic anhydride and cyclopentane tetracarboxylic anhydride as the trifunctional or tetrafunctional polybasic carboxylic acid of the third component. ### Claim 6 A method for producing flat yarn comprising: melt extruding as a main component an aliphatic polyester having a melt viscosity of 2.0.times.10.sup.3 -4.0.times.10.sup.4 poises at a temperature of 190.degree. C. and shear rate of 100 sec.sup.-1, and having a melting point of 70.degree.-190.degree. C, wherein said aliphatic polyester is obtained from ingredients consisting essentially of diisocyanate and a prepolymer in a molten state by adding from 0.1 to 5 parts by weight of diisocyanate to 100 parts by weight of a prepolymer in a molten state, wherein said prepolymer is obtained from a reaction of at least an aliphatic glycol and an aliphatic dicarboxylic acid, wherein the reaction includes (a) succinic acid, or its anhydride, reacted with 1,4-butanediol, (b) succinic acid, adipic acid, or their anhydride, reacted with 1,4-butanediol, or (c) succinic acid, or its anhydride, reacted with ethylene glycol, and has a number-average molecular weight of at least 10,000, to form a film; then stretching the film. ### Claim 7 A method for producing flat yarn comprising: melt extruding as a main component an aliphatic polyester having a melt viscosity of 2.0.times.10.sup.3 -4.0.times.10.sup.4 poises at a temperature of 190.degree. C. and a shear rate of 100 sec.sup.-1, and having a melting point of 70.degree.-190.degree. C., wherein said aliphatic polyester is obtained from ingredients consisting essentially of diisocyanate and a prepolymer in a molten state by adding from 0.1 to 5 parts by weight of diisocyanate to 100 parts by weight of a prepolymer in a molten state, wherein said prepolymer is obtained from a reaction of at least an aliphatic glycol and an aliphatic dicarboxylic acid, wherein the reaction includes (a) succinic acid, or its anhydride, reacted with 1,4-butanediol, (b) succinic acid, adipic acid, or their anhydride, reacted with 1,4-butanediol, or (c) succinic acid, or its anhydride, reacted with ethylene glycol, and has a number-average molecular weight of at least 10,000, to form a film; stretching the film; then splitting the stretched film.