Hot-melt polymer composition

Abstract

Abstract PURPOSE: To obtain the title composition with reduceed melt viscosity without incorporation of low molecular weight substances, by the reaction on heating between an elastomer like an ethylene-propylene copolymer rubber and polypropylene in the presence of an organic peroxide. CONSTITUTION: A polymer mixture consisting of an elastomer comprising at least one rubber selected from an etylene-propylene copolymer rubber, a polyisobutylene rubber, and a butyl rubber and a crystalline or noncrystalline polypropylene (or a mixture of both) is incorporated with 0.5W3wt% based on said polymer misture, of an organic peroxide (e.g., t-bulyl perbenzoate) at a temperature below its decomposition temperature. The resulting system is then made to react on heating at 150W200°C for ≤30min., thus giving the objective composition. USE: Hot-melt adhesives and sealants with incorporating at least one stickiness-imparting resin such as rosin, a rosin derivative, a terpene resin, a hydrocabon resin, phenolic resin etc. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Kazuo Saotome

Bibliographic Details