Expansible sealant compositions and blowing agents

Details Expansible sealant compositions and blowing agents Expansible sealant compositions and blowing agents

1996-05-21

2000-01-11

Sergent, Rabon

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521106, 521113, 521128, 521131, 521133, 521155, 521164, 521167, 521170, 521172, 521174, 521175, 222635, C08J 912, C08G 1828, C08G 1840, C08G 1848

Patent

active

06013691&

ABSTRACT:
The present invention discloses a foam frothing alternative for blowing or frothing single component foams using gases which are incapable of being liquified within the limits of DOT aerosol cans, referred to herein as non-liquefiable gases. In this invention, it is demonstrated that non-liquefiable gases such as CO.sub.2 and N.sub.2 O can be used to provide foams using conventional single component foam chemical raw materials. The present invention provides an adhesive/sealant, expanded by a non-liquefiable gas propelled from a container initially and expanded by a blowing agent consisting primarily or exclusively of a non-liquefiable gas and formulated from a moisture curable polyurethane prepolymer using a low molecular weight isocyanate of two or more functionality. In one or more variations, the compositions of the present invention contain solubility enhancers for non-liquefiable gases such as CO.sub.2 or supplemental propellants/liquefiable blowing agents, as well as other additives such as, for example, catalysts, fire retardants, and surfactants which include, but are not limited to cell openers.

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Excerpt entitled "CO.sub.2 blowing agent is for molded foams" from Sep., 1995 issue of Modern Plastics, p. 102.
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Brochure entitled "BEAMECH CO-2.TM. Workshop Flexible Slabstock Foams CO-2 Process Technology" believed to have been disseminated subsequent to May 21, 1996.

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