초록 ▼

Construction materials prepared from recycled polymeric material containing primarily polyolefins such as high density polyethylene, ultra high molecular weight polyethylene, low density polyethylene, linear low density polyethylene, and polypropylene homopolymers and copolymers are useful for profi

Construction materials prepared from recycled polymeric material containing primarily polyolefins such as high density polyethylene, ultra high molecular weight polyethylene, low density polyethylene, linear low density polyethylene, and polypropylene homopolymers and copolymers are useful for profiled extruded forms such as fence posts, door frames, rails, railway sleepers, and other applications where lumber is conventionally employed. The compositions of the invention contain, in addition to the mixed plastic matrix, reactive compatibilizers, impact modifiers, and reinforcing agents. When desired, foaming agents may also be employed. The recycled mixed plastic materials have been subject to at least one high temperature processing step when used in their original application. Such plastics differ in physical and chemical composition from virgin material.

대표청구항 ▼

A mixed plastic composition which is extrudable through a profile die into a structural article which comprises: (A) a polymer matrix having 100 parts of a first component having not less than 80% by weight of a waste polyethylene material and from 5 to 25 pph of a second component containing reacti

A mixed plastic composition which is extrudable through a profile die into a structural article which comprises: (A) a polymer matrix having 100 parts of a first component having not less than 80% by weight of a waste polyethylene material and from 5 to 25 pph of a second component containing reactive groups and selected from at least one of ethylene-propylene-maleic anhydride copolymers, styrene-maleic anhydride copolymers, ethylene-methyl acrylate copolymers, ethylene-ethyl acrylate copolymers, ethylene-acrylic acid copolymers, ethylene-vinyl acetate copolymers, ethylene-ethyl acrylate-methacrylic acid terpolymers, partial metal salts of ethylene-methacrylic acid and maleic anhydride grafter EPDM rubbers; (B) from 10 to 100 pph of fiberglass as a reinforcing filler, with or without a coupling agent; and (C) from 0.3 to 2 pph of a foaming agent, such composition after extrusion having a specific gravity in the range of 0.5 to 1.2 and a flexural strength of from 700 to 2000 psi.