Process for the preparation of polyurethane cold cure foams

Details Process for the preparation of polyurethane cold cure foams Process for the preparation of polyurethane cold cure foams

2006-10-17

2010-11-23

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...

C521S110000, C521S112000

Reexamination Certificate

active

07838566

ABSTRACT:
The invention relates to a process for the preparation of polyurethane cold cure foams by reacting a mixture of highly reactive polyols, which usually have an average molecular weight of from about 4800 to 6500 g/mol and at least 70% of primary hydroxyl groups and optionally contain fillers, and polyfunctional isocyanates, amine activators, crosslinking agents, tin catalysts, blowing agents and stabilizers, wherein the stabilizers used are compounds of the general formula (1)the proportion of siloxanes with N>9 being higher than 10% by weight and that with N>12 being equal to or higher than 5% by weight.

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