Microporous isocyanate-based polymer compositions and method of

Details Microporous isocyanate-based polymer compositions and method of Microporous isocyanate-based polymer compositions and method of

1994-06-29

1995-12-26

Dodson, Shelley A.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521128, 521155, C08G 1800

Patent

active

054788676

ABSTRACT:
A novel microporous isocyanate-based xerogel composition is disclosed. The composition can be prepared by a method comprising (1) (1) admixing (a) a polyisocyanate component, (b) a substantially unreactive solvent, and, optionally, (c) a polymerization catalyst, water, an active-hydrogen compound or a mixture thereof, provided that (c) is included wherein (b) does not also function to catalyze polymerization; under reaction conditions sufficient to form a gel; and (2) removing the solvent under non-supercritical conditions sufficient to form a microporous xerogel composition. The compositions can be readily evacuated for use in thermal insulative applications such as vacuum panels, for uses such as appliance insulation, which show superior K-factor values when compared with, for example, conventional rigid polyurethane open-cell foams as used in similar applications.

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