High molecular weight alkylmethyl-alkylaryl siloxane terpolymers having low SiH content and methods for their preparation
AssigneesDow Corning Corporation, Dow Corning Asia, Ltd.
InventorsKeiichi Akinaga, Qian Jane Feng, Lenin James Petroff
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Abstract
The present invention relates to triorganosiloxy-endblocked poly(methyl(C6-C40alkyl)siloxane)-poly(methyl(aralkyl)siloxane)-poly(methyl(C2-C4alkyl)siloxane) terpolymers. This invention also relates to two different methods of making these terpolymers. The triorganosiloxy-endblocked poly(methyl(C6-C40alkyl)siloxane)-poly(methyl(aralkyl)siloxane)-poly(methyl(C2-C4alkyl)siloxane) terpolymers of this invention are useful as mold release agents in aluminum die cast release agents, rubber lubricants, and as high reflexive index additives for the personal care industry.
Claims44
A triorganosiloxy-endblocked poly(methyl(C6-C40alkyl)siloxane)-poly(methyl(aralkyl)siloxane)-poly(methyl(C2-C4alkyl)siloxane) terpolymer having the formula:
- (R)3SiO(CH3R1SiO)x(CH3R2SiO)y(CH3R3SiO)zSi(R)3
- wherein each R is independently selected from the group consisting of alkyl groups, aryl groups, alkaryl groups, and aralkyl groups, R1 denotes an alkyl group having from 6 to 40 carbon atoms, R2 denotes an aralkyl group, R3 denotes an alkyl group having from 2 to 4 carbon atoms, x has an average value of from 25 to 120, y has an average value of from 5 to 40, and z has an average value of from 0.1 to 20.
A method of making a triorganosiloxy-endblocked poly(methyl(C6-C40alkyl)siloxane)-poly(methyl(aralkyl)siloxane)-poly(methyl(C2-C4alkyl)siloxane) terpolymer comprising:
- (i) reacting at temperature of less than or equal to 120° C. a mixture comprising:
- (a) a linear triorganosiloxy-endblocked polymethylhydrogensiloxane;
- (b) an alpha-olefin having from 6 to 40 carbon atoms;
- and
- (c) a platinum-containing catalyst
- (ii) reacting at temperature of less than or equal to 120° C. a mixture comprising:
- (d) the product of (i);
- and
- (e) an unsaturated aromatic compound to form a triorganosiloxy-endblocked poly(methylalkylsiloxane)-poly(methyl(aralkyl)siloxane)-polymethylhydrogensiloxane terpolymer;
- (iii) reacting a mixture comprising:
- (f) the triorganosiloxy-endblocked poly(methylalkylsiloxane)-poly(methyl(aralkyl)siloxane)-polymethylhydrogensiloxane terpolymer of (ii);
- (g) an alpha-olefin having from 6 to 40 carbon atoms;
- and
- (iv) exposing the product of (iii) to (h) an olefin having from 2 to 4 carbon atoms in the presence of (j) a platinum-containing catalyst at a temperature of from 50 to 70° C., and a pressure from atmospheric pressure to 150 psi.
A method of making a triorganosiloxy-endblocked poly(methyl(C6-C40alkyl)siloxane)-poly(methyl(aralkyl)siloxane)-poly(methyl(C2-C4alkyl)siloxane) terpolymer comprising:
- (i) reacting at temperature of less than or equal to 120° C. a mixture comprising:
- (a) a linear triorganosiloxy-endblocked polymethylhydrogensiloxane;
- (b) an unsaturated aromatic compound;
- (c) a platinum-containing catalyst;
- and
- (ii) reacting at temperature of less than or equal to 120° C. a mixture comprising:
- (d) the product of (i);
- and
- (e) an alpha-olefin having from 6 to 40 carbon atoms to form a triorganosiloxy-endblocked poly(methylalkylsiloxane)-poly(methyl(aralkyl)siloxane)-polymethylhydrogensiloxane terpolymer;
- and
- (iii) exposing the triorganosiloxy-endblocked poly(methylalkylsiloxane)-poly(methyl(aralkyl)siloxane)-polymethylhydrogensiloxane terpolymer of (ii) to (f) an olefin having from 2 to 4 carbon atoms in the presence of (g) a platinum-containing catalyst at a temperature of from 50 to 70° C., and a pressure from atmospheric pressure to 150 psi.
Dependencies are inferred from the claim text.