Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1989-10-23
1991-05-07
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
528 15, 528 16, 528 14, 528 17, 528 18, 528 19, 528 21, 528 22, 528 34, 528901, C08F28300
Patent
active
050138006
ABSTRACT:
A novel room temperature-curable organopolysiloxane-based composition is proposed which is capable of giving a surface coating highly insusceptible to surface stain even by exposure over years. The composition comprises: (A) a block copolymer composed of dimethylsiloxane units and trifunctional siloxane units of which the organic group is a phenyl group or a fluorine containing aliphatic group, in a specified molar proportion; (B) an organosilane compound having hydrolyzable groups; and (C) a polyoxyalkylene-modified organosiloxane compound of the formula (Me.sub.3 SiO--).sub.2 SiR.sup.4 --C.sub.3 H.sub.6 --(--O--R.sup.5 --).sub.b --O--SiR.sup.6.sub.a X.sub.3-a, in which Me is a methyl group, R.sup.4 is a methyl group or trimethylsiloxy group, R.sup.5 is an ethylene group or propylene group, R.sup.6 is a monovalent hydrocarbon group, X is a hydrolyzable group, the subscript a is zero or 1 and the subscript b is a positive integer not exceeding 50, with optional addition of a condensation catalyst.
REFERENCES:
patent: 4631208 (1986-12-01), Westall
patent: 4963626 (1990-10-01), Hirose et al.
Marquis Melvyn I.
Shin-Etsu Chemical Co. , Ltd.
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