Adhesive composition having improved clarity for coextruded barrier films
AssigneeEquistar Chemicals, LP
InventorDaniel R. Ward
Life of this patent
Estimating the term…
Abstract
Adhesive compositions useful for adhering barrier resins are provided. The adhesives are a blend of ethylene-a-olefin copolymer base resin having hard and soft phases which form a network structure and a functionally modified ethylene-α-olefin copolymer.
Claims15
A tie-layer adhesive composition comprising:
- (a) 95.5 to 99.5 weight percent, based on the weight of the composition, ethylene-C4-8 α-olefin copolymer base resin having hard and soft phases that form a network structure, density of 0.925 g/cm3 or less, melt index from 0.3 to 5 g/10 min and which, when in the pelletized form, exhibits a reduction in ER of 10 percent or more to a final ER value of 1.0 or less upon rheometric low shear modification or solution dissolution, and
- (b) 0.5 to 4.5 weight percent, based on the weight of the composition, modified polyolefin which is an ethylene-C3-8 α-olefin copolymer having a density of 0.905 to 0.965 g/cm3 grafted with 0.5 to 2.5 weight percent ethylenically unsaturated carboxylic acid or ethylenically unsaturated carboxylic acid derivative.
A multi-layer barrier film comprising a barrier resin layer wherein the barrier resin is selected from the group consisting of ethylene-vinyl alcohol copolymer and nylon and adhesively bonded thereto a tie-layer adhesive composition comprising 95.5 to 99.5 weight percent, based on the weight of the composition, ethylene-C4-8 α-olefin copolymer base resin having hard and soft phases that form a network structure, density of 0.925 g/cm3 or less, melt index from 0.3 to 5 g/10 min., and which, when in the pelletized form, exhibits a reduction in ER of 10 percent or more to a final ER value of 1.0 or less upon rheometric low shear modification or solution dissolution, and 0.5 to 4.5 weight percent, based on the weight of the composition, modified polyolefin which is an ethylene-C3-8 α-olefin copolymer having a density of 0.905 to 0.965 g/cm3 grafted with 0.5 to 2.5 weight percent ethylemcally unsaturated carboxylic acid or ethylenically unsaturated carboxylic acid derivative.
Dependencies are inferred from the claim text.