Butene copolymer-containing adhesive blends
View Patent ↗Compositions suitable for use as adhesives in multi-layer structures. The compositions comprise a blend of an ethylene copolymer of butene and a propylene-based polymer; a polyolefin grafted with an ethylenically unsaturated carboxylic acid or acid derivative; and an olefin polymer resin different than the ethylene copolymer of butene, the propylene-based polymer and the grafted polyolefin.
1. An adhesive composition comprising:
A) 12 to 60 wt % of a blend comprising:
75 to 95 wt % of a butene-1 copolymer comprising 80 to 98 wt % butene-1 and 2 to 20 wt % ethylene; and
5 to 25 wt % of a terpolymer comprising 75 to 98 wt % propylene, 1 to 10 wt % ethylene and 1 to 15 wt % butene-1;
B) 2 to 20 wt % of a polyolefin grafted with an ethylenically unsaturated carboxylic acid or acid derivative; and
C) 20 to 86 wt % of an olefin polymer resin different than the butene-1 copolymer, the terpolymer and the grafted polyolefin.
2. The adhesive composition of claim 1 wherein the blend is present in an amount from 15 to 45 wt %.
3. The adhesive composition of claim 1 , wherein the blend comprises 80 to 94 wt % of the butene-1 copolymer and 6 to 20 wt % of the terpolymer.
4. The adhesive composition of claim 1 wherein the butene-1 copolymer comprises 85 to 94 wt % butene-1 and 6 to 15 wt % ethylene.
5. The adhesive composition of claim 1 wherein the terpolymer comprises 82 to 96 wt % propylene, 2 to 8 wt % ethylene and 2 to 10 wt % butene-1.
6. The adhesive composition of claim 5 wherein the terpolymer comprises 86 to 95 wt % propylene, 2 to 6 wt % ethylene, and 3 to 8 wt % butene-1.
7. A multilayer structure comprising an adhesive layer and a second layer bonded to the adhesive layer, the adhesive layer comprising:
A) 12 to 60 wt % of a blend comprising:
75 to 95 wt % of a butene-1 copolymer comprising 80 to 98 wt % butene-1 and 2 to 20 wt % ethylene; and
5 to 25 wt % of a terpolymer comprising 75 to 98 wt % propylene, 1 to 10 wt % ethylene and 1 to 15 wt % butene-1;
B) 2 to 20 wt % of a polyolefin grafted with an ethylenically unsaturated carboxylic acid or acid derivative; and
C) 20 to 86 wt % of an olefin polymer resin different than the butene-1 copolymer, the terpolymer and the grafted polyolefin.
8. The multilayer structure of claim 7 wherein the blend is present in an amount from 15 to 45 wt %.
9. The multilayer structure of claim 7 wherein the blend comprises 80 to 94 wt % of the butene-1 copolymer and 6 to 20 wt % of the terpolymer.
10. The multilayer structure of claim 7 wherein the butene-1 copolymer comprises 85 to 94 wt % butene-1 and 6 to 15 wt % ethylene.
11. The multilayer structure of claim 7 wherein the terpolymer comprises 82 to 96 wt % propylene, 2 to 8 wt % ethylene and 2 to 10 wt % butene-1.
12. The multilayer structure of claim 11 wherein the terpolymer comprises 86 to 95 wt % propylene, 2 to 6 wt % ethylene, and 3 to 8 wt % butene-1.