Method of stabilizing imino-functional silane
AssigneeMomentive Performance Materials Inc.
InventorsRichard W Cruse, Matthew Pinnow
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Abstract
A method of stabilizing imino-functional silane involving adding thereto at least one Brønsted-Lowry base to inhibit, suppress or prevent the addition reactions of the imino-functional silane with itself to form a imino- and amino-functional silane and the subsequent deamination reactions to form conjugated carbon-carbon double bond-containing imino-functional silanes and stabilized imino-functional silanes containing the at least one Brønsted-Lowry base.
Claims15
A stabilized imino-functional silane which contains less than about 15 ppm proton source based on the weight of the stabilized imino-functional silane and contains less than about 2 weight percent conjugated carbon-carbon double bond-containing imino-functional silane based on the total weight of conjugated carbon-carbon double bond-containing imino-functional silane and imino-functional silane after storage at 25° C. for 4 weeks and wherein the imino-functional silane is an imino-functional alkoxysilane of general formula (I):
- wherein:
- R0 is hydrogen, a monovalent hydrocarbon group of from 1 to about 20 carbon atoms or a monovalent heterocarbon group of from 1 to about 20 carbon atoms containing one or more heteroatoms;
- R1 is a divalent hydrocarbon group of from 1 to about 20 carbon atoms or a divalent heterocarbon group of from 1 to about 20 carbon atoms;
- R2 is an alkyl group of from 1 to about 5 carbon atoms;
- R3 is phenyl or an alkyl group of from 1 to about 8 carbon atoms;
- G is a monovalent or polyvalent hydrocarbon group of from 1 to about 30 carbon atoms or a heterocarbon group of from 1 to about 30 carbon atoms containing one or more heteroatoms where the carbon of G which connects to the imino group is unsubstituted;
- subscript a is 0, 1 or 2;
- and,
- subscript x is 1 or 2.
A stabilized imino-functional silane which contains less than about 15 ppm proton source based on the weight of the stabilized imino-functional silane and contains less than about 0.5 weight percent conjugated carbon-carbon double bond-containing imino-functional silane based on the total weight of conjugated carbon-carbon double bond-containing imino-functional silane and imino-functional silane after storage at 25° C. for 4 weeks and wherein the imino-functional silane is an imino-functional alkoxysilane of general formula (I):
- wherein:
- R0 is hydrogen, a monovalent hydrocarbon group of from 1 to about 20 carbon atoms or a monovalent heterocarbon group of from 1 to about 20 carbon atoms containing one or more heteroatoms;
- R1 is a divalent hydrocarbon group of from 1 to about 20 carbon atoms or a divalent heterocarbon group of from 1 to about 20 carbon atoms;
- R2 is an alkyl group of from 1 to about 5 carbon atoms;
- R3 is phenyl or an alkyl group of from 1 to about 8 carbon atoms;
- G is a monovalent or polyvalent hydrocarbon group of from 1 to about 30 carbon atoms or a heterocarbon group of from 1 to about 30 carbon atoms containing one or more heteroatoms where the carbon of G which connects to the imino group is unsubstituted;
- subscript a is 0, 1 or 2;
- and,
- subscript x is 1 or 2.
Dependencies are inferred from the claim text.