Dimensionally stable closed cell rigid polyisocyanate based foam

Details Dimensionally stable closed cell rigid polyisocyanate based foam Dimensionally stable closed cell rigid polyisocyanate based foam

1997-11-14

1999-03-16

Truong, Duc

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 53, 521 82, 521 98, 521131, 521155, 528 76, 528272, 2523635, 25218215, 2521822, C08G 1800

Patent

active

058831460

ABSTRACT:
There is now provided a closed cell rigid polyisocyanate based foam blown with a C.sub.1 -C.sub.4 hydrofluorocarbon and formic acid as blowing agents, which possesses a uniform density gradient varying by not more than 10 percent. There is also now provided a polyol composition and a froth foaming mixture having good flow by employing a polyol and formic acid in the presence of a C.sub.1 -C.sub.4 hydrofluorocarbon having a boiling point of 300K or less as co-blowing agents. The polyol composition advantageously has an average OH number of less than 400 and an average functionality of greater than 4, which when reacted with the isocyanate in the presence of a C.sub.1 -C.sub.4 hydrofluorocarbon, yields a rigid closed cell polyisocyanate based dimensionally stable foam having a fine cell structure.

REFERENCES:
patent: 5205956 (1993-04-01), Volkert et al.
patent: 5308881 (1994-05-01), Londrigan et al.

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