Low density polyurethane foam, method of producing, and...

Details Low density polyurethane foam, method of producing, and... Low density polyurethane foam, method of producing, and...

2008-03-04

2008-03-04

Cooney, Jr., John M. (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

C428S304400, C428S423100, C521S124000, C521S125000, C521S130000, C521S131000, C521S174000, C521S176000

Reexamination Certificate

active

11200536

ABSTRACT:
A method for producing a cured, low-density polyurethane foam, the method comprises frothing a reactive polyurethane-forming composition comprising an isocyanate-containing component, an active hydrogen-containing component reactive with the isocyanate-containing component, a blowing agent, a surfactant, and catalyst system, wherein the catalyst system provides for a delayed curing of the foam; casting the frothed reactive polyurethane-forming composition onto a first carrier; placing a second carrier on a side of the cast foam opposite the first carrier; blowing the froth with the second carrier in place; and curing the blown froth so as to provide a polyurethane foam layer having a density of about 50 to about 400 kg/m3and a thickness of about 0.3 to about 13 mm. The foams are useful as sealing members.

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