Open-celled rigid polyurethane foam

Details Open-celled rigid polyurethane foam Open-celled rigid polyurethane foam

1996-12-20

1998-02-24

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521132, 521172, 521174, C08G 1810

Patent

active

057212848

ABSTRACT:
Disclosed is a process for preparing an open-celled rigid polyurethane foam by reacting a polyisocyanate with a polyol in the presence of a blowing agent, usually water, and a cell opening agent. The cell opening agent comprises a combination of a polyoxyalkylene polysiloxane having a cloud point of 65.degree. C. or less, and a second substance that has a critical surface free energy of less than about 23 mJ/m.sup.2. Highly preferred as second substance is fine particulate poly(tetrafluoroethylene) polymer.

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Chemical Abstract 94-250183/31.

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