Use of polysiloxane polyoxyalkylene block copolymers for the pre

Details Use of polysiloxane polyoxyalkylene block copolymers for the pre Use of polysiloxane polyoxyalkylene block copolymers for the pre

1990-08-30

1992-07-14

Kight, III, John

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521112, 521137, 521159, 521174, 521175, C08J 904, C08L 7504, C08G 1861

Patent

active

051303442

ABSTRACT:
A process of preparing rigid polyurethane foams is disclosed, wherein polysiloxane polyoxyalkylene block copolymers which have at least one aminofunctional group of the general formula, ##STR1## which is linked to a silicon atom, are used in an amount of 0.2 to 5% by weight, based on the polyol or the prepolymer having isocyanate groups, to provide polyurethane foams, which otherwise contain closed cells, with at least partially open the cells.

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patent: 4331555 (1982-05-01), Baskent et al.
patent: 4478957 (1984-10-01), Klietsch et al.
patent: 4529743 (1985-07-01), Kollmeier et al.

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