Laminates of cloth and filled crystalline polypropylene and a method for making them
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United States of America Patent
Stats
-
Oct 27, 1981
Grant Date -
N/A
app pub date -
Dec 17, 1979
filing date -
Dec 29, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Laminates comprising cloth (17) or other sheet material bonded to a filled crystalline polypropylene composition (14) by means of an unfilled crystalline polypropylene composition (15), preferably a crystalline random copolymer of propylene and 0.5 to 5.0% of ethylene. The laminates are made by sandwiching preferably a sheet (15) of the unfilled composition between the cloth (17) and filled composition (14) and then heating the sandwich to above the crystalline melting points of the polypropylenes and subsequently cooling to form the laminate. The fillers may be minerals or wood flour, the cloths may be knitted, woven or felted and other sheet materials may be plastics films, metal foils, paper or leather cloth.
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