# US 2006/0155028 A1 · Linear low density polyethylene compositions and films > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2006/0155028 A1 - Document ID: US20060155028A1 - Status: Published application - Kind: A1 - Application number: 11/033,793 - Filed: 2005-01-12 - Published: 2006-07-13 - Earliest claimed: 2005-01-12 - Assignees: Equistar Chemicals, LP - Inventors: Chun Lee; Manivakkam Shankernarayanan - Web page: https://patentgrep.com/patent/US20060155028A1 ## CPC - C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond} - C08L 51/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond - C08L 67/00: Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain (of polyester-amides C08L77/12; of polyester-imides C08L79/08); Compositions of derivatives of such polymers - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract Linear low density polyethylene compositions suitable for the production of films having improved breathability are provided. The compositions which are comprised of a linear low density polyethylene base resin, a functionalized polyolefin and a polyester polyol are melt blended under conditions of mixing and shear to increase their melt elasticity. ## Claims ### Claim 1 A composition comprising: (a) 70 to 97 weight percent, based on the total weight of the composition, linear low density polyethylene base resin; (b) 2.5 to 25 weight percent, based on the total weight of the composition, modified polyolefin containing acid or acid derivative functionality; and (c) 0.5 to 5 weight percent, based on the total weight of the composition, polyester polyol. ### Claim 2 (depends on 1) The composition of claim 1 wherein (a) is a copolymer of ethylene and a C3-8 α-olefin having a density from 0.890 to 0.930 g/cm3 and melt index from 0.1 to 10 g/10 min, (b) is a polyethylene resin grafted with an unsaturated carboxylic acid or carboxylic anhydride; and (c) is an aliphatic polyester polyol having a hydroxyl number from 50 to 115 mg. KOH per gram. ### Claim 3 (depends on 2) The composition of claim 2 wherein (a) is a copolymer of ethylene and 2 to 25 weight percent butene-1 or hexene-1 having a density from 0.905 to 0.922 g/cm3 and melt index from 0.5 to 5 g/10 min. ### Claim 4 (depends on 2) The composition of claim 2 wherein (b) is a high density polyethylene resin or linear low density polyethylene resin grafted with from 0.2 to 4 weight percent maleic anhydride. ### Claim 5 (depends on 2) The composition of claim 2 wherein (c) is derived from adipic acid and a C2-6 aliphatic diol or mixture of C2-6 aliphatic diols and trimethylol propane or diethylene glycol and has a hydroxyl number from 50 to 70 mg. KOH per gram. ### Claim 6 (depends on 2) The composition of claim 2 comprising 80 to 94 weight percent (a), 5 to 15 weight percent (b) and 1 to 5 weight percent (c). ### Claim 7 (depends on 2) The composition of claim 2 having a melt index from 0.1 to 10 g/10 min after reactive compounding and wherein the components are melt blended under conditions of mixing and shear such that the melt elasticity is at least 40% greater than that of the linear low density polyethylene base resin. ### Claim 8 (depends on 7) The composition of claim 7 wherein (a) is a copolymer of ethylene and 2 to 25 weight percent butene-1 or hexene-1 having a density from 0.905 to 0.922 g/cm3 and melt index from 0.5 to 5 g/10 min., (b) is a high density polyethylene resin or linear low density polyethylene resin grafted with from 0.2 to 4 weight percent maleic anhydride, and (c) is derived from adipic acid and a C2-6 aliphatic diol or mixture of C2-6 aliphatic diols and trimethylol propane or diethylene glycol and has a hydroxyl number from 50 to 70 mg. KOH per gram. ### Claim 9 (depends on 8) The composition of claim 8 having a melt elasticity after reactive compounding 65 percent or more greater than that of the linear low density polyethylene base resin. ### Claim 10 (depends on 8) The composition of claim 8 comprising 80 to 94 weight percent (a), 5 to 15 weight percent (b) and 1 to 5 weight percent (c). ### Claim 11 (depends on 8) The composition of claim 8 wherein (a) is an ethylene-butene-1 copolymer and (b) is a high density polyethylene resin grafted with from 0.4 to 3.5 weight percent maleic anhydride. ### Claim 12 (depends on 8) The composition of claim 8 wherein (a) is an ethylene-hexene-1 copolymer and (b) is a high density polyethylene resin grafted with from 0.4 to 3.5 weight percent maleic anhydride. ### Claim 13 A linear low density film having improved breathability produced by melt blending a composition comprising (a) 70 to 97 weight percent, based on the total weight of the composition, linear low density polyethylene base resin; (b) 2.5 to 25 weight percent, based on the total weight of the composition, modified polyolefin containing acid or acid derivative functionality; and (c) 0.5 to 5 weight percent, based on the total weight of the composition, polyester polyol, said melt blending carried out under conditions of mixing and shear such that the melt elasticity of the composition is at least 40 percent greater than that of the linear low density polyethylene base resin. ### Claim 14 (depends on 13) The film of claim 13 having a thickness of from 0.5 to 5 mils. ### Claim 15 (depends on 14) The film of claim 14 wherein, after melt blending, the composition has a melt index of 0.1 to 10 g/10 min and melt elasticity 65 percent or more greater than that of the linear low density polyethylene base resin. ### Claim 16 (depends on 15) The film of claim 15 wherein (a) is a copolymer of ethylene and 2 to 25 weight percent butene-1 or hexene-1 having a density from 0.905 to 0.922 g/cm3 and melt index from 0.5 to 5 g/10 min, (b) is a high density polyethylene resin or linear low density polyethylene resin grafted with from 0.2 to 4 weight percent maleic anhydride and (c) is derived from adipic acid and a C2-6 aliphatic diol or mixture of C2-6 aliphatic diols and trimethylol propane or diethylene glycol and has a hydroxyl number from 50 to 70 mg. KOH per gram. ### Claim 17 (depends on 16) The film of claim 16 wherein the composition is comprised of 80 to 94 weight percent (a), 5 to 15 weight percent (b) and 1 to 5 weight percent (c). ### Claim 18 (depends on 14) The film of claim 14 which is a blown film. ### Claim 19 (depends on 14) The film of claim 14 which is a cast film.