Adhesive compositions
View Patent ↗Adhesive compositions comprising a first copolymer of butene-1 and propylene; a second copolymer of ethylene and a comonomer selected from butene-1, hexene-1, and octene-1; a polyolefin grafted with an ethylenically unsaturated carboxylic acid or acid derivative; and an olefin polymer resin, and multilayer structures comprising the adhesive composition.
1. An adhesive composition comprising:
A) a first copolymer comprising 85 to 99 wt % butene-1 and 1 to 15 wt % propylene;
B) a second copolymer comprising 45 to 85 wt % ethylene and 15 to 55 wt % of a comonomer selected from butene-1, hexene-1 or octene-1;
C) 2 to 20 wt % of a polyolefin grafted with an ethylenically unsaturated carboxylic acid or acid derivative; and
D) 20 to 93 wt % of an olefin polymer resin different from components A), B), and C),
wherein the sum of the first and second copolymers is 5 to 60 wt % based on the amount of adhesive composition and the weight ratio of the first copolymer to the second copolymer is 0.3 to 3.
2. The adhesive composition of claim 1 wherein the sum of first and second copolymers is 20 to 45 wt % based on the amount of adhesive composition.
3. The adhesive composition of claim 1 wherein the weight ratio of the first and second copolymers is 0.4 to 2.5.
4. The adhesive composition of claim 3 wherein the weight ratio of the first and second copolymers is 0.5 to 2.2.
5. The adhesive composition of claim 1 wherein the first copolymer comprises 90 to 98 wt % of butene-1 and 2 to 10 wt % of propylene.
6. The adhesive composition of claim 1 wherein the second copolymer comprises 45 to 60 wt % ethylene and 40 to 55 wt % of the comonomer.
7. The adhesive composition of claim 1 wherein the comonomer is octene-1.
8. A multilayer structure comprising an adhesive layer and a second layer bonded to the adhesive layer, the adhesive layer comprises the adhesive composition of claim 1 .
9. The multilayer structure of claim 8 wherein the sum of the first and second copolymers is 20 to 45 wt % based on the amount of adhesive composition.
10. The multilayer structure of claim 8 wherein the weight ratio of the first copolymer to the second copolymer is 0.4 to 2.5.
11. The multilayer structure of claim 10 wherein the weight ratio of the first copolymer to the second copolymer is 0.5 to 2.2.
12. The multilayer structure of claim 8 wherein the first copolymer comprises 90 to 98 wt % of butene-1 and 2 to 10 wt % of propylene.
13. The multilayer structure of claim 8 wherein the second copolymer comprises 45 to 60 wt % ethylene and 40 to 55 wt % of the comonomer.
14. The multilayer structure of claim 8 wherein the comonomer is octene-1.