US 12,331,221 B2
Use of a particular ethylene-butyl acrylate copolymer in a hot-melt adhesive composition that is transparent in the molten state
Jean-Michel Bruneau, Gisors (FR); Martine Le Nobin, Saint-Aubin le Guichard (FR); Jean-Philippe Soriano, Lyons (FR); and Florence Quetel, Combon (FR)
Assigned to SK GLOBAL CHEMICAL CO., LTD., Seoul (KR)
Appl. No. 16/468,317
Filed by SK GLOBAL CHEMICAL CO., LTD., Seoul (KR)
PCT Filed Dec. 22, 2017, PCT No. PCT/FR2017/053821
§ 371(c)(1), (2) Date Jun. 11, 2019,
PCT Pub. No. WO2018/115789, PCT Pub. Date Jun. 28, 2018.
Claims priority of application No. 1663224 (FR), filed on Dec. 22, 2016.
Prior Publication US 2020/0071575 A1, Mar. 5, 2020
Int. Cl. C09J 123/08 (2006.01); C08K 5/01 (2006.01); C09J 7/35 (2018.01); C09J 133/08 (2006.01); C09J 191/06 (2006.01)
CPC C09J 123/0869 (2013.01) [C08K 5/01 (2013.01); C09J 7/35 (2018.01); C09J 133/08 (2013.01); C09J 191/06 (2013.01); C09J 2203/334 (2013.01); C09J 2301/304 (2020.08); C09J 2301/312 (2020.08); C09J 2301/408 (2020.08); C09J 2423/04 (2013.01); C09J 2433/00 (2013.01)] 5 Claims
 
1. A thermo-fusible adhesive composition comprising at least one cohesion agent, the agent comprising at least one copolymer of ethylene and n-butyl acrylate having a melt flow index of 460 to 650 g/10 minutes, measured at a temperature of 190° C., and having a content of 26 to 29% by weight of n-butyl acrylate, calculated with respect to total weight of the copolymer of ethylene and n-butyl acrylate,
wherein the thermo-fusible adhesive composition further comprises:
only one wax chosen from the group consisting of mixtures of paraffin wax and Fisher-Tropsch waxes, the mixtures containing at most 10 wt % of Fisher-Tropsch waxes; and
an aliphatic-modified aromatic hydrogenated hydrocarbon adhesive resin, different from the cohesion agent, is present in a content ranging from 40 to 60% by weight, relative to the total weight of the composition,
wherein the copolymer of ethylene and n-butyl acrylate is present in the thermo-fusible adhesive composition in a content ranging from 30 to 40% by weight, relative to the total weight of the composition,
wherein the composition does not comprise a copolymer of ethylene and vinyl acetate, and the cloud point of the mixture made up of 50% by weight of the at least one copolymer and 50% by weight of the at least one hydrogenated hydrocarbon adhesive is from 50° C. to 90° C., and
wherein the composition is transparent in a molten state when poured at a depth of 5 mm.