Substantially closed cell rigid polyurethane foams

Details Substantially closed cell rigid polyurethane foams Substantially closed cell rigid polyurethane foams

1992-09-11

1994-08-16

Kight, III, John

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

Synthetic resins

Cellular products or processes of preparing a cellular...

25218224, 25218226, 25218227, 428290, 4284231, 4283144, 4283166, 521116, 521167, 521172, 521174, 568700, 568704, C08G 1832

Patent

active

053387686

ABSTRACT:
Substantially closed cell rigid polyurethane foam cores of laminates are disclosed which are scorch-free, have a density of 50 kg/m.sup.3 and are made using water as the sole or main blowing agent and without the need to use a CFC. The foams are prepared from polyol compositions comprising the product of alkoxylating an initiator having a functionality of more than 2, at least one aromatic ring and at least one amino nitrogen atom. The initiator is preferably a Mannich condensate of a phenolic compound, formaldehyde and ammonia or an alkanolamine and the polyol is preferably used together with a second polyol having a functionality (or average functionality) of at least 1 but less than 3 and a molecular weight M.sub.w (or average molecular weight) of 250 to 4000.

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"Advances in Technology and Uses of Rigid Urethane Foams"; Frisch et al. (Modern Plastics 40, 165 (Oct. 1962)).

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