Method for the mixing of low-boiling foaming agent

Details Method for the mixing of low-boiling foaming agent Method for the mixing of low-boiling foaming agent

1993-10-28

1995-08-22

Czaja, Donald E.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521164, 521171, C08G 1814

Patent

active

054441005

ABSTRACT:
A method for the mixing of a polyol with a low-boiling foaming agent for the manufacture of a rigid foamed polyurethane. The polyol is blended in advance with a specific amount of the low-boiling foaming agent such as chlorodifluoromethane (designated by HCFC-22) or the like in a liquid state. In this case, it is possible to uniformly supply the polyol and the specific amount of HCFC-22 to a polyurethane foaming system, resulting in a homogeneous foaming reaction whereby a rigid foamed polyurethane having excellent cell uniformity without any voids may be obtained.

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