Rigid polyurethane foams for insulation and process for...

Details Rigid polyurethane foams for insulation and process for... Rigid polyurethane foams for insulation and process for...

2002-05-23

2009-11-17

Cooney, John (Department: 1796)

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

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S130000, C521S131000, C521S174000

Reexamination Certificate

active

07619014

ABSTRACT:
A rigid polyurethane foam having lose density without an increased k-factor can be produced by adding small amounts of butyl alcohol to a polyurethane composition containing an isocyanate, at least one polyol, a catalyst and a gaseous blowing agent.

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patent: 2002/0020827 (2002-02-01), Munzenberger et al.
patent: 2325468 (1998-11-01), None

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