Polysulfide-based polyurethane sealant for insulating glass
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United States of America Patent
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May 7, 2002
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N/A
app pub date -
Nov 24, 1999
filing date -
Nov 24, 1999
priority date (Note) -
Expired
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Abstract
An insulated glass sealant having the best characteristics of polysulfides and polyurethanes rather than the worst is made from a polysulfide-based polyurethane prepared by a one-step procedure wherein a randomly copolymeric hydroxyl-terminated polysulfide polyacetal is reacted with a polyisocyanate at a ratio of from about 1:1 to about 1:1.2 on an equivalents basis. The copolymeric hydroxyl-terminated polysulfide polyacetal is made by the condensation of formaldehyde with a mixture of a dithiodialkylene glycol and an aliphatic or cycloaliphatic diol.
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