Process for producing cellular plastics by the polyisocyanate polyaddition method by means of stable emulsions containing blowing agents, and such emulsions
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United States of America Patent
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Nov 20, 1990
Grant Date -
N/A
app pub date -
Jul 3, 1989
filing date -
Jul 19, 1988
priority date (Note) -
Expired
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Abstract
This invention concerns a process for producing cellular plastics by the polyisocyanate polyaddition process by reaction of (a) organic and/or modified organic polyisocyanates with (b) at least one high molecular compound with at least two reactive hydrogens and optionally (c) low molecular chain extenders and/or crosslinking agents in the presence of (d) blowing agents (e) catalysts (f) additives and/or processing aids where low boiling fluorinated or perfluorinated hydrocarbons with 3 to 8 carbons that are insoluble or almost insoluble in (a) to (c), sulfur hexafluoride or mixtures thereof are used as blowing agent (d) which is emulsified in reaction components (a), (b), mixtures of (b) and (c) or (a) and (b) as well as stable blowing agent emulsion of the aforementioned blowing agents (d) reaction components (a), (b) or (b) and (c).
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