# US 9,518,161 B2 · Polymer compositions, methods of making the same, and articles made therefrom > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,161 B2 - Document ID: US9518161B2 - Status: Granted - Kind: B2 - Application number: 14/285,050 - Filed: 2014-05-22 - Published: 2015-01-29 - Granted: 2016-12-13 - Earliest claimed: 2013-07-23 - Assignees: ExxonMobil Chemical Patents Inc. - Applicants: ExxonMobil Chemical Patents Inc. - Inventors: Paul M. German - Web page: https://patentgrep.com/patent/US9518161B2 ## CPC - C08J 5/18: Manufacture of films or sheets - B32B 27/08: of synthetic resin - B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} - B32B 2250/242: All polymers belonging to those covered by group B32B27/32 - B32B 2307/558: Impact strength, toughness - B32B 2439/40: Closed containers - B32B 2439/70: Food packaging - C08J 2323/06: Polyethene - C08J 2423/02: not modified by chemical after treatment - C08J 2423/12: Polypropene - C08J 2423/14: Copolymers of propene (C08J2423/16 takes precedence) - Y10T 428/31913: Monoolefin polymer - 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 - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The present disclosure is directed to compositions and methods for improving the cling performance in stretch-cling films. Compositions include: (a) 80.0 to 99.5 wt. % of a propylene-based elastomer, the propylene-based elastomer comprising at least about 60.0 wt. % propylene-derived units and about 5.0 to about 25.0 wt. % ethylene-derived units, based on total weight of the propylene-based elastomer, wherein the propylene-based elastomer has a heat of fusion of less than about 80.0 J/g; and (b) 0.5 to 20.0 wt. % of a polyalphaolefin, wherein the amounts of the propylene-based elastomer, and the polyalphaolefin are based on the weight of the composition. Methods of making such compositions as well as compositions including an ethylene-based polymer and films and methods of making films are also disclosed. ## Claims ### Claim 1 A composition for improving the cling performance in stretch-cling films, the composition comprising: (a) 80.0 to 99.5 wt. % of a propylene-based elastomer, the propylene-based elastomer comprising at least about 60.0 wt. % propylene-derived units and about 5.0 to about 25.0 wt. % ethylene-derived units, based on total weight of the propylene-based elastomer, wherein the propylene-based elastomer has a heat of fusion of less than about 80.0 J/g; and (b) 0.5 to 20.0 wt. % of a polyalphaolefin, wherein the polyalphaolefin has a pour point of −100.0 to 0° C.; wherein the amounts of the propylene-based elastomer and the polyalphaolefin are based on the weight of the composition; wherein the composition has a cling force of about 0.50×102 to 5.0×102 g/in at 2.0×102% stretch. ### Claim 2 (depends on 1) The composition of claim 1, wherein about 8.0 to about 22.5 wt. % of the polymer units in the propylene-based elastomer are ethylene-derived units and the polypropylene-based elastomer has a Melt Flow Rate (MFR) of about 2.0 to about 30.0 g/10 min. ### Claim 3 (depends on 1) The composition of claim 1, wherein the propylene-based elastomer has a weight average molecular weight (Mw) of about 5.0×103 to about 5.0×106 g/mol. ### Claim 4 (depends on 1) The composition of claim 1, wherein the polyalphaolefin is present in an amount of about 2.0 to 12.0 wt. %. ### Claim 5 (depends on 1) The composition of claim 1, wherein the polyalphaolefin has a weight average molecular weight (Mw) of about 5.0×102 to about 1.0×104 g/mol. ### Claim 6 (depends on 1) The composition of claim 1, wherein the polyalphaolefin has a kinematic viscosity at 25° C. of about 5.0 to about 1.5×103 cSt. ### Claim 7 (depends on 1) The composition of claim 1, further comprising a polyolefin. ### Claim 8 A composition comprising: (a) 99.8 to 50.0 wt. % of an ethylene-based polymer; (b) 0.1 to 25.0 wt. % of a propylene-based elastomer, the propylene-based elastomer comprising at least about 60.0 wt. % propylene-derived units and about 5.0 to about 25.0 wt. % ethylene-derived units, based on total weight of the propylene-based elastomer, wherein the propylene-based elastomer has a heat of fusion of less than about 80.0 J/g; and (c) 0.1 to 25.0 wt. % of a polyalphaolefin, wherein the polyalphaolefin has a pour point of −100.0 to 0° C.; wherein the amounts of the ethylene-based polymer, the propylene-based elastomer, and the polyalphaolefin are based on the weight of the composition wherein the composition has a cling force of about 0.50×102 to 5.0×102 g/in at 2.0×102% stretch. ### Claim 9 (depends on 8) The composition of claim 8, wherein the propylene-based elastomer is present in an amount of about 5.0 to 20.0 wt. %. ### Claim 10 (depends on 8) The composition of claim 8, wherein about 8.0 to about 22.5 wt. % of the polymer units in the propylene-based elastomer are ethylene-derived units and the polypropylene-based elastomer has a Melt Flow Rate (MFR) of about 2.0 to about 30.0 g/10 min. ### Claim 11 (depends on 8) The composition of claim 8, wherein the propylene-based elastomer has a weight average molecular weight (Mw) of about 5.0×103 to about 5.0×106 g/mol. ### Claim 12 (depends on 8) The composition of claim 8, wherein the polyalphaolefin is present in an amount of about 1.0 to 20.0 wt. %. ### Claim 13 (depends on 8) The composition of claim 8, wherein the polyalphaolefin has a weight average molecular weight (Mw) of about 5.0×102 to about 1.0×104 g/mol. ### Claim 14 (depends on 8) The composition of claim 8, wherein the polyalphaolefin has a kinematic viscosity at 25° C. of about 5.0 to about 1.5×103 cSt. ### Claim 15 (depends on 8) The composition of claim 8, wherein the polyalphaolefin has a pour point of −100.0 to 0° C. ### Claim 16 A method of making a composition comprising: combining i) 99.8 to 50.0 wt. % of an ethylene-based polymer; ii) 0.1 to 25.0 wt. % of a propylene-based elastomer, the propylene-based elastomer comprising at least about 60.0 wt. % propylene-derived units and about 5.0 to about 25.0 wt. % ethylene-derived units, based on total weight of the propylene-based elastomer, wherein the propylene-based elastomer has a heat of fusion of less than about 80.0 J/g; and iii) 0.1 to 25.0 wt. % of a polyalphaolefin, wherein the polyalphaolefin has a pour point of −100.0 to 0° C., wherein the amounts of the ethylene-based polymer, the propylene-based elastomer, and the polyalphaolefin are based on the weight of the composition; wherein the composition has a cling force of about 0.50×102 to 5.0×102 g/in at 2.0×102% stretch. ### Claim 17 A film comprising: (a) a Layer A comprising: (i) 99.8 to 50.0 wt. % of a first ethylene-based polymer; (ii) 0.1 to 25.0 wt. % of a first propylene-based elastomer, the propylene based elastomer comprising at least about 60.0 wt. % propylene-derived units and about 5.0 to about 25.0 wt. % ethylene-derived units, based on total weight of the propylene-based elastomer, wherein the propylene-based elastomer has a heat of fusion of less than about 80.0 J/g; and (iii) 0.1 to 25.0 wt. % of a first polyalphaolefin, wherein the polyalphaolefin has a pour point of −100.0 to 0° C., wherein the amounts of the first ethylene polymer, the first propylene-based elastomer, and the first polyalphaolefin are based on the total weight of Layer A; wherein the film has a cling force of about 0.50×102 to 5.0×102 g/in at 2.0×102% stretch. ### Claim 18 (depends on 17) The film of claim 17, wherein the polyalphaolefin is present in an amount of about 1.0 to 20.0 wt. % of Layer A. ### Claim 19 (depends on 17) The film of claim 17, wherein the polyalphaolefin has a weight average molecular weight (Mw) of about 5.0×102 to about 1.0×104 g/mol. ### Claim 20 (depends on 17) The film of claim 17, wherein the polyalphaolefin has a kinematic viscosity at 25° C. of about 5.0 to about 1.5×103 cSt. ### Claim 21 (depends on 17) The film of claim 17, further comprising a Layer B, Layer B having a first side in surface contact with a first side of Layer A and a Layer C in surface contact with a second side of Layer B, wherein the Layer C comprises: (i) 99.8 to 50.0 wt. % of a second ethylene-based polymer; wherein the second ethylene-based polymer has the same or different melt index and density as the first ethylene-based polymer; (ii) optionally 0.1 to 25.0 wt. % of a second propylene-based elastomer, comprising at least about 60 wt. % propylene-derived units and about 5 to about 25 wt. % ethylene-derived units, based on total weight of the second propylene-based elastomer, wherein the second propylene-based elastomer has a heat of fusion of less than about 80 J/g; and (iii) optionally 0.1 to 25.0 wt. % of second polyalphaolefin, wherein the amounts of the second ethylene-based polymer, the second propylene-based elastomer, and the second polyalphaolefin are based on the total weight of Layer C. ### Claim 22 (depends on 21) The film of claim 21, wherein the first and second propylene-based elastomers have a different amount of ethylene derived units and/or weight average molecular weight (Mw) as the first propylene-based elastomer. ### Claim 23 (depends on 21) The film of claim 21, wherein the first and second polyalphaolefins have a different weight average molecular weight and/or kinematic viscosity at 25° C. ### Claim 24 A method for providing a film having a cling force in a stretched state, comprising: (a) forming a composition from at least: (i) 99.8 to 50.0 wt. % of an ethylene-based polymer; (ii) 0.1 to 25.0 wt. % of a propylene-based elastomer, the propylene-based elastomer comprising at least about 60.0 wt. % propylene-derived units and about 5.0 to about 25.0 wt. % ethylene-derived units, based on total weight of the propylene-based elastomer, wherein the propylene-based elastomer has a heat of fusion of less than about 80.0 J/g; and (iii) 0.1 to 25.0 wt. % of a polyalphaolefin, wherein the polyalphaolefin has a pour point of −100.0 to 0° C.; wherein the amounts of the ethylene-based polymer, the propylene-based elastomer, and the polyalphaolefin are based on the total weight of the composition, and (b) forming the composition into at least one layer of the film; wherein the film has a cling force of about 0.50×102 to 5.0×102 g/in at 2.0×102% stretch.