Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1991-03-20
1992-08-11
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 31, 528 32, 525478, 525404, 525412, C08G 7706
Patent
active
051380099
ABSTRACT:
A curable composition comprises an organopolysiloxane-polyoxyalkylene block copolymer terminated at both ends of a molecular chain with a lower aliphatic unsaturated group and consists essentially of organopolysiloxane units having a main chain of the formula, (R.sup.1 R.sup.2 SiO)m, and polyoxyalkylene units of the formula, (R.sup.3 O)n. The organopolysiloxane units and the polyoxyalkylene units are bonded through R.sup.1 R.sup.2 SiR.sup.4 groups, wherein R.sup.1 and R.sup.2 independently represent an unsubstituted or substituted monovalent hydrocarbon group except for an aliphatic unsaturated group, R.sup.3 and R.sup.4 independently represent a divalent hydrocarbon group, and m and n are, respectively, defined integers. The composition further comprises an organohydrogenpolysiloxane having at least two .tbd.SiH groups in one molecule and a curing agent therefor. A cured product obtained from the composition is a silicone rubber elastomer having properties inherent to the silicone rubber but is hydrophilic in nature.
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Hellender Karen A.
Marquis Melvyn I.
Shin-Etsu Chemical Co. , Ltd.
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