Granted Patent B1

US 7,932,323 · App. 12/590,224 · Granted Apr 26, 2011

Abstract

Claims (17)

1. A polyolefin-based adhesive composition comprising a polyolefin, a maleated polyolefin, a Bronsted acid, and an antioxidant; wherein the Bronsted acid is used in an amount of 0.05 wt % to 0.5 wt %, based on the composition, to improve the oxidative stability of the composition and wherein the polyolefin-based adhesive composition is used as a tie-adhesive layer for multilayer films, pipes, geomembranes, containers, automotive parts, and wire and cable insulations and jackets.

2. The composition of claim 1 , wherein the polyolefin is a homopolymer or copolymer of C 2 to C 10 α-olefins.

3. The composition of claim 2 , wherein the polyolefin is selected from the group consisting of polyethylene, polypropylene, and mixtures thereof.

4. The composition of claim 3 , wherein the polyolefin is a polyethylene.

5. The composition of claim 4 , wherein the polyolefin is a linear low density polyethylene.

6. The composition of claim 1 , wherein the maleated polyolefin is selected from the group consisting of maleated polyethylene, maleated polypropylene, and mixtures thereof.

7. The composition of claim 1 , wherein the maleated polyolefin contains from 1 wt % to 2.5 wt % of grafted maleic anhydride.

8. The composition of claim 1 , which comprises from 5 wt % to 35 wt %, based on the composition, of the maleated polyolefin.

9. The composition of claim 1 , wherein the Bronsted acid is selected from phosphoric acid, phosphorous acid, and mixtures thereof.

10. The composition of claim 1 , which comprises from 0.05 wt % to 0.5 wt %, based on the composition, of the antioxidant.

11. The composition of claim 1 , which comprises an elastomer selected from the group consisting of ethylene-propylene rubber, styrene-diene random and block copolymers, and mixtures thereof.

12. The composition of claim 11 , which comprises from 5 wt % to 35 wt %, based on the composition, of the elastomer.

13. A multilayer film, pipe, geomembrane, container, automotive part, or a wire and cable insulation or jacket comprising the composition of claim 1 .

14. A multilayer film of claim 13 , comprising a general structure of

HDPE/tie-layer/EVOH/tie-layer/HDPE, or

LLDPE/HDPE/tie-layer/EVOH/tie-layer/HDPE/LLDPE,

wherein HDPE is a high density polyethylene layer, EVOH is a polyvinyl alcohol layer, and LLDPE is a linear low density polyethylene layer.

Assignments (10)