Formulated resin component for use in spray-in-place foam...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

Reexamination Certificate

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Details

C521S130000, C521S159000, C521S167000, C521S170000, C521S174000

Reexamination Certificate

active

07855240

ABSTRACT:
The subject invention provides an open-celled polyurethane foam formed from a polyurethane spray foam system that mixes a formulated resin component with an isocyanate component. The resultant open-celled polyurethane spray foam has a density of about ½ pound per cubic foot. The resin component includes water as a blowing agent, a first aliphatic, amine-initiated polyol having a number-average molecular weight of from 150 to 500 and having tetra-functionality, and a second polyol having terminal hydroxyl groups and having a number-average molecular weight of from 3500 to 8000. A curing component having at least one primary amine group and having a number-average molecular weight of from 150 to 5000 is also included in the resin component. The spray foam system reacts a) the resin component and b) the isocyanate component in a volumetric ratio of a) to b) of from 1:1.2 to 1:5 and having an isocyanate index of from 15 to 70.

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