Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1992-03-23
1992-11-24
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521113, 521114, 521117, 521121, 521128, 521130, 521131, C08G 1814
Patent
active
051661829
ABSTRACT:
Blowing agents and blowing agent mixtures for preparing a cellular thermosetting plastic foam comprise either (1) a non-chlorinated, partially hydrogenated fluorocarbon with the general formula H.sub.x F.sub.y C.sub.z ; (2) a non-chlorinated, partially hydrogenated fluorocarbon ether with the general formula H.sub.x F.sub.y C.sub.z --O--C.sub.m F.sub.n H.sub.p ; (3) a non-chlorinated, non-hydrogenated, fully fluoronated fluorocarbon; (4) an azeotropic mixture having a boiling point below 50 degrees Celsius; or (5) any mixture of the foregoing. The azeotropic mixtures are produced from organic compounds having surface active properties that enable the blended azeotropic mixture to become miscible with polymer resins. Among the preferred compounds for use in azeotropic mixtures are n-pentane, acetone, methyl alcohol, methyl formate, ethyl formate, ethyl alcohol, 2-methyl butane, nitromethane, cyclopentane, 2,3,-dimethyl butane, 2,2,-dimethyl butane, and dimethyl sulfide. The azeotropic blowing agents and blowing agent systems of the invention can be mixed with partially hydrogenated fluorocarbons and chlorofluorocarbons, and are useful for preparing low density polyurethane, polyisocyanurate, polyurethane modified polyisocyanurate, and phenol-formaldehyde foams.
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Atlas Roofing Corporation
Welsh Maurice J.
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