Curable composition containing a polysulfide polyether and a compound having at least two isocyanate groups
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United States of America Patent
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Jun 7, 1994
Grant Date -
N/A
app pub date -
May 26, 1993
filing date -
Dec 7, 1990
priority date (Note) -
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Abstract
The curable composition which includes: (A) a polysulfide polyether having in a main chain: (i) a polyether moiety represented by --(R.sub.1 O).sub.n --, wherein R.sub.1 is an alkylene group having 2-4 carbon atoms, and n is an integer of 6-200; (ii) structural units represented by --C.sub.2 H.sub.4 OCH.sub.2 OC.sub.2 H.sub.4 --S.sub.x --, and --CH.sub.2 CH(OH)CH.sub.2 --S.sub.x -- wherein x is an integer of 1-5; and at both ends: (iii) a thiol group represented by --C.sub.2 H.sub.4 OCH.sub.2 OC.sub.2 H.sub.4 --SH, and/or --CH.sub.2 CH(OH)CH.sub.2 --SH; and (B) a compound having two or more isocyanate groups in one molecule; a molar ratio of isocyanate groups contained in the component (B) to thiol groups contained in the component (A) being 0.5-4.0 (isocyanate groups/thiol groups).
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