Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1988-04-18
1989-10-10
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525477, 528 26, 528 32, 528 34, C08F28312
Patent
active
048732982
ABSTRACT:
Hydroxy functional polysiloxane graft copolymers are provided. The copolymer is crosslinkable by hydroxy-reactive crosslinking agent and, in particular, is suitable for use in thermosetting coating compositions adapted to form a flexible cured coating over a variety of substrates, such as metal and plastic. The copolymer has a number average molecular weight between about 1300 and about 15,000, has a hydroxyl number between about 30 and about 300, and is the reaction product of carbon-carbon double bond-reactive monoethylenically unsaturated monomer with hydroxy functional carbon-carbon double bond-bearing branched polysiloxane macromer. The macromer is the reaction product of (i) hydroxy functional polysiloxane reactant containing 0-10 urethane linkages per molecule, with (ii) silane compound having the general formula: ##STR1## wherein R is H or an alkyl group with one to three carbon atoms, R' is a phenylene or substituted phenylene group (including amino functionality) or a carboxylate group, n being 0 to 3, and X is a halogen, substituted glycol monoether group, alkoxy group or acyloxy group.
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Bleutge John C.
Dean Jr. Ralph H.
E. I. Du Pont de Nemours and Company
Lynn John M.
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