Polymers with graft .alpha.-alkylacrylate functionality
AssigneeLoctite Corporation
InventorsSamuel Q. S. Lien, Steven T. Nakos
Life of this patent
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Abstract
Polymers having .alpha.-alkylacrylate functionality may be prepared by hydrosilating an aliphatically unsaturated polymer with a grafting agent of structure (A) or (B): ##STR1## where R.sup.1 is an alkyl group; R.sup.2 is a divalent group nonreactive under hydrosilation conditions; n is 0, 1, 2, 3, or 4; x and y are 0, 1, 2, 3 or 4 and x+y=1, 2, 3 or 4; and, the R.sup.3 groups are the same or different alkyl, substituted alkyl, aryl, substituted aryl or ##STR2## groups. Preferred olefinically unsaturated polymers include homopolymers and copolymers of butadiene or alkyl substituted butadiene and polyorganosiloxanes with unsaturated hydrocarbyl groups such as vinyl or allyl.
Claims16
A method of adding .alpha.-alkylacrylate functionality to an aliphatically unsaturated polymer, the method comprising reacting at temperatures between about 0.degree. C. and about 100.degree. C. a grafting agent consisting essentially of a compound selected from (A), (B) and mixtures thereof with said aliphatically unsaturated polymer in the presence of a hydrosilation catalyst selected from platinum-based catalysts and rhodium complex catalysts, said grafting agent compounds (A) and (B) having the respective structures:
- ##STR8## where R.sup.1 is an alkyl group;
- R.sup.2 is a divalent group nonreactive under hydrosilation conditions;
- n is 0, 1, 2, 3, or 4;
- x and y are 0, 1, 2, 3 or 4 and x+y=1, 2, 3 or 4;
- and, the R.sup.3 groups are the same or different alkyl, substituted alkyl, aryl, substituted aryl or ##STR9## groups.
A method as in claim 4 wherein R.sup.2 is propylene, propyleneoxy or ethyleneoxypropylene.
A polymer conprising the hydrosilation reaction product of an aliphatically unsaturated polymer and a grafting agent consisting essentially of a compound of structure (A), (B), or mixtures thereof:
- ##STR10## where R.sup.1 is an alkyl group;
- R.sup.2 is a divalent group nonreactive under hydrosilation reaction conditions;
- n is 0, 1, 2, 3, or 4;
- x and y are 0, 1, 2, 3 or 4 and x+y=1, 2, 3 or 4;
- and, the R.sup.3 groups are the same or different alkyl, substituted alkyl, aryl, substitute aryl or ##STR11## groups, said hydrosilation reaction being conducted in the presence of a platinium-based or rhodium complex hydrosilation catalyst at a temperature of between about 0.degree. C. and about 100.degree. C.
Dependencies are inferred from the claim text.