Method of preparing modified polyethylenes

Abstract

A method of preparing a modified polyethylene which comprises melt kneading 100 parts by weight of (A) a high density polyethylene having a branching degree of not more than 5 per 1,000 carbon atoms of principal chain, from 0.2 to 3 parts by weight of (B) an unsaturated carboxylic acid or a derivative thereof, and from 0.01 to 0.5 part by weight of (C) an organic peroxide, the weight ratio of (C) to (B), (C)/(B), being from 0.01 to 0.5. The modified polyethylenes obtained by the use of the method of the present invention not only have excellent heat resistance, moldability, and so forth, but also are extremely improved in their adhesion property, especially in the property of adhering to a saponified ethylene-vinyl acetate copolymer, a polyamide resin, and a polyester resin, and therefore the modified polyethylenes can be advantageously used with these materials for the production of laminated boards.

Dependencies are inferred from the claim text.