Process for the production of rigid polyurethane foams

Details Process for the production of rigid polyurethane foams Process for the production of rigid polyurethane foams

1984-10-12

1985-07-16

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

525479, 528 25, 528 29, 556453, 556456, C08G 1814

Patent

active

045297436

ABSTRACT:
In a process for producing rigid polyurethane foams, polysiloxane-polyoxyalkylene block copolymers having the formula ##STR1## are used, in which A represents polyoxyalkylene blocks A.sup.1 or A.sup.2 having the formula --R.sup.2 --O--(C.sub.m H.sub.2m O).sub.y R.sup.1, which are linked to silicon by an SiC bond and in which R.sup.1 represents a hydrogen atom or an alkyl radical with 1 to 4 carbon atoms, R.sup.2 represents a bridging group, y is a whole number, and m has a value of 2.0 to 2.6, with the proviso that:

REFERENCES:
patent: 3507815 (1970-04-01), Bailey et al.
patent: 3637541 (1972-01-01), Rossmy
patent: 3714080 (1973-01-01), Dahm et al.
patent: 4420409 (1983-12-01), Fukano et al.

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