C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/644
C08J 9/32 (2006.01) B29B 11/16 (2006.01) B29C 47/20 (2006.01) B29C 47/88 (2006.01) B29C 51/00 (2006.01) B29D 7/01 (2006.01) B32B 5/18 (2006.01) C08J 5/18 (2006.01) C08J 9/00 (2006.01) C08J 9/04 (2006.01) C08K 7/18 (2006.01) C08L 23/10 (2006.01)
Patent
CA 1295448
ABSTRACT OF THE DISCLOSURE A polypropylene resin foamed sheet for thermoforming having compounded therein an inorganic fine powder is disclosed. The sheet contains 10 to 50% by weight of the inorganic fine powder, has a density of 0.2 to 1.2 g/cm and a thickness of 0.2 to 3 mm and having a percent shrinkage of 5 to 30% in each of the longitudinal and crosswise directions on heating at 190°C for 30 minutes, with the ratio of a residual rate in the longitudinal direction to that in the crosswise direction being from 1:07 to 1:1.1. The sheet is produced by extruding and foaming a compounded resin from a ring die of an extruder, and taking off the extruded tubular foamed sheet along a cylindrical plug whose diameter is 2.0 to 3.0 times that of said ring die.
580054
Doi Tsuneo
Hayashi Motoshige
Matsuoka Kiyotaka
Riches Mckenzie & Herbert Llp
Sekisui Kaseihin Kogyo Kabushiki Kaisha
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