Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1990-07-30
1992-06-30
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...
525 61, 525100, C08L 2904
Patent
active
051264005
ABSTRACT:
A curable polydiorganosiloxane is reinforced by mixing with a modified polyvinylalcohol (PVA). Fully hydrolyzed PVA is modified by dissolving or swelling in solvent, then adding a silylating agent of the formula R".sub.b (R'.sub.2 SiO).sub.n SiR.sub.a X.sub.4-a where R is a group capable of undergoing hydrolysis to form a siloxane bond with the curable polydiorganosiloxane, R' is a monovalent alkyl or aryl radical having from 1 to 6 carbon atoms, optionally halogen substituted, and compatible with the curable polydiorganosiloxane, R" is either R or R', X is a radical reactive with the hydroxyl on the PVA, a and b are integers of 0 to 3 inclusive, the sum of a plus b is from 1 to 3 inclusive, and n is from 0 to 35. This modified PVA is then mixed with the curable polydiorganosiloxane. The polydiorganosiloxane is then cured and the solvent is extracted to yield a cured polydiorganosiloxane reinforced with polyvinylalcohol.
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Graiver Daniel
Gvozdic Nedeljko V.
Dean Jr. R.
Dow Corning Corporation
Elliott Edward C.
Marquis Melvyn I.
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