Patent ID: 6136249
Filing Date: 2000-10-24
Classification: B29B,B29C,B29K,B29L,B32B,B60R,Y02W,Y10S

Abstract:
A process for producing a bumper of synthetic resin for use in an automobile by injection molding, said bumper including a core and an outer layer covering and being integrally molded with the core, said process comprising the steps of:pulverizing a recovered bumper which has been formed using a polyolefin-based resin composition modified by an olefinic elastomer and which has a thermosetting synthetic resin coating film on its surface,preparing 1) a core forming material by using said pulverized recovered bumper as a main component and adding a polyethylene to the main component,preparing 2) an outer layer forming material using a polyolefin-based resin composition modified by an olefinic elastomer and a polyethylene in a content A.sub.2 which is smaller than a content A.sub.1 of the polyethylene included in said core forming material (A.sub.2 <A.sub.1);injecting said outer layer forming material through a feed channel into a bumper molding cavity in a mold;injecting said core forming material to flow into said outer layer forming material located in said feed channel and said cavity, and allowing said outer layer forming material and said core forming material to flow into said cavity; andpushing said outer layer forming material and said core forming material which are located in said feed channel into said cavity by said outer-layer forming material thereby to form said core and said outer layer.