Film-forming copolymers and their use in water vapor permeable coatings
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United States of America Patent
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-
Dec 8, 1992
Grant Date -
N/A
app pub date -
Mar 21, 1991
filing date -
Apr 26, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A film-forming copolymer is formed by copolymerising 100 parts of a curable polyurethane resin and 10 to 100 parts of an organosilicon compound, consisting essentially of SiO.sub.2, R.sub.3 SiO.sub.1/2 and R'R.sub.2 SiO.sub.1/2 units, the ratio of monovalent units to tetravalent units being from 0.4/1 to 2/1 and from 40 to 90% of and monovalent units being R'R.sub.2 SiO.sub.1/2 units. R is a monovalent hydrocarbon group having up to 8 carbons and R' denotes a OH-terminated polyoxyalkylene group. The invention also includes a method of making fabrics waterproof and permeable to water vapor by coating it with such copolymer.
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