Compatible blends of polyolefins with thermoplastic polyurethanes
AssigneeThe Dow Chemical Company
InventorVincent S. Zabrocki
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Abstract
Disclosed are novel thermoplastic compatible compositions comprising a polyolefin, a thermoplastic polyurethane, and a compatibilizing amount of at least one modified polyolefin. The polymer blends are soft, flexible, resinous compositions of high tensile and tear strengths. The compositions overcome the barrier of incompatibility between polyethylene and thermoplastic polyurethanes.
Claims16
A thermoplastic compatible blended composition comprising A. from about 15 to about 60 weight percent of a polyolefin, B. from about 30 to about 70 weight percent of a thermoplastic polyurethane, and C. from about 10 to about 35 weight percent of at least one modified polyolefin defined as a random, block or graft olefin copolymer having in a main or side chain thereof a functional group selected from the class consisting of carboxylic acid, carboxylate ester, carboxylic acid anhydride, carboxylate salts, amide, epoxy, hydroxy, and acyloxy.
A thermoplastic compatible composition comprising on a 100 weight percent basis:
- A. from about 15 to about 60 percent linear low density polyethylene;
- B. from about 30 to about 70 percent of a polyurethane derived from the reaction of an organic diisocyanate, a polymeric diol;
- and a difunctional extender;
- and
- C. from about 10 to about 35 percent of a modified polyethylene selected from the group consisting of ethylene/vinyl acetate copolymer, ethylene/methylacrylate copolymer, ethylene/methacrylic acid copolymer, ethylene/acrylic acid copolymer, ethylene/maleic anhydride graft copolymer, maleic anhydride grafted ethylene/vinyl acetate copolymer, and mixtures thereof in any combination.
Dependencies are inferred from the claim text.