Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1995-08-22
1997-02-18
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 451, 264 464, 264 466, 2642711, 427230, B29C 4406, B29C 4412
Patent
active
056038747
ABSTRACT:
A polyurethane seat pad having a center seat portion and bank portions therearound is molded by using a mold defining a cavity having a center region corresponding to the center seat portion and side regions corresponding to the bank portions, placing collecting vessels of expanded polyolefin in the side regions of the mold cavity, pouring a foamable polyurethane liquid for low hardness foam into the cavity between said collecting vessels, pouring a foamable polyurethane liquid for high hardness foam into said collecting vessels, and causing the foamable liquids to expand, thereby producing a polyurethane seat pad having the collecting vessels embedded therein. The expanded polyolefin is a crosslinked polyolefin foam having an index of surface wetting of at least 36 dyne/cm. The seat pad in which the bank portions have higher hardness than the seating portion and which is fully durable against repetitive loading can be produced to the desired configuration in a stable manner.
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patent: 4424240 (1984-01-01), Kielbania, Jr.
patent: 4440899 (1984-04-01), Peerlkamp
patent: 4457729 (1984-07-01), Peerlkamp
patent: 4563388 (1986-01-01), Bonk et al.
patent: 4612249 (1986-09-01), Packer et al.
patent: 4613653 (1986-09-01), Kitchens et al.
patent: 4923746 (1990-05-01), Balmisse et al.
patent: 5244612 (1993-09-01), Iwasawa et al.
Abstract of J59047277, World Patents Index, Derwent Publications Ltd., London, GB, 16 Mar. 1984.
Ishii Seiji
Iwasawa Toshio
Bridgestone Corporation
Kuhns Allan R.
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