Diacetylenic polyorganosiloxanes, intermediates therefor, and cured compositions prepared therefrom
AssigneeGeneral Electric Company
InventorsSylvie Louise Boileau, Anna Elzbieta Kowalewska, Laurent Bouteiller, Matthew David Butts, Slawomir Rubinsztajn
Life of this patent
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Abstract
Intermediate compositions comprising ethynylorgano polyorganosiloxanes are prepared by hydrosilylation of an olefinic hydroxy compound followed by reaction with a propargyl halide, or by hydrosilylation of a diethynyl compound. The intermediate compositions may be oxidatively coupled to form poly(conjugated diacetylenic)polyorganosiloxanes. The latter may be cured thermally or by radiation to form cured compositions useful as release coatings or conformal coatings.
Claims29
An intermediate composition comprising ethynylorgano polyorganosiloxanes having the formula
- (M1)a(M2)b(D1)c(D2)d(T1)e(T2)fQg, (I)
- wherein:
- each of a, b, c, d, e, f and g is 0 or greater, with the proviso that b+d+f is at least 1;
- each R1 is independently a divalent organic radical having no Si—O—C moieties and containing at least one oxygen atom not directly bound to Si or at least one CH═CH moiety directly bound to Si;
- and
- each R2 is independently non-halogenated or halogenated alkyl, aryl, alkoxy or aryloxy.
A diethynyl-terminated polyorganosiloxane having the formula
- wherein:
- each R1 is independently a divalent organic radical having no Si—O—C moieties and containing at least one oxygen atom not directly bound to Si or at least one CH═CH moiety directly bound to Si;
- each R2 is independently non-halogenated or halogenated alkyl, aryl, alkoxy or aryloxy;
- n is in a range between about 1 and about 500;
- and
- p is in a range between about 1 and about 100.
A diethynyl-terminated polyorganosiloxane having the formula
- wherein R1 has the formula —CH2O(CH2)2O(CH2)3— with (CH2)3 bound to silicon;
- n is in a range between about 5 and about 25;
- and p is 1 or 2.
A diethynyl-terminated polyorganosiloxane having the formula
- wherein each R1 has the formula
- —(CH2)4CH═CH—
- or
- —HC═CH(CH2)4CH═CH—
- with the olefinic groups bonded to silicon;
- n is in a range between about 5 and about 25;
- and p is 1 or 2.
Dependencies are inferred from the claim text.