Silicone resins and process for synthesis
AssigneesDow Corning Corporation, Dow Corning Asia, Ltd.
InventorsGregory Scott Becker, Leslie Earl Carpenter, II, Russell Keith King, Tetsuyuki Michino, Eric Scott Moyer
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Abstract
A method for hydrolyzing chlorosilanes having at least three chlorine atoms bonded to each silicon atom to form silicone resins. The method comprises adding at least one of hydridotrichlorosilane, tetrachlorosilane, or organotrichlorosilane to a two-phase mixture comprising a non-polar organic solvent, an aqueous phase comprising 0 to about 43 weight percent hydrochloric acid, and a surface active compound selected from the group consisting of alkylsulphonic acid hydrate, alkali metal salt of alkylsulphonic acid, arysulphonic acid hydrate, and alkali metal salt of arylsulphonic acid.
Claims20
A process for the preparation of a silicone resin comprising adding at lease one chlorosilane described by the formula R×SiCl4-x to a two-phase mixture comprising
- (I) a nonpolar organic solvent,
- (II) an aqueous phase comprising
- (i) an amount of water to comprise at least a stoichiometric amount in relation to the chlorosilane,
- (ii) 0 to 43 weight percent hydrochloric acid based on the aqueous phase, and
- (iii) a surface active compound selected from the group consisting of alkylsulphonic acid hydrate, alkali metal salt of alkylsulphonic acid, arylsulphonic acid hydrate and alkali metal salt of arylsulphonic acid,
- where X=0 or 1 and each R is selected from the group consisting of hydrogen and monovalent hydrocarbon radicals.
A process for the preparation of a silicone resin comprising
- (A) adding at least one chlorosilane described by formula RxSiCl4-x to a two phase mixture comprising a nonpolar organic solvent, an aqueous phase comprising an amount of water to comprise at least a stoichiometric amount in relation to the chlorosilane, 0 to about 43 weight percent hydrochloric acid based on the aqueous phase, and a surface active compound selected from the group consisting of alkylsulphonic acid hydrate, alkali metal salt of alkylsulphonic acid, arysulphonic acid hydrate, and alkali metal salt of arylsulphonic acid and
- (B) separating the two phase-mixture into an organic phase comprising the silicone resin and an aqueous phase, where the silicone resin is selected from the group consisting of fully condensed resins described by formulas (HSiO3/2)m, (RSiO3/2)m, (HSiO3/2)s(RSiO3/2)t, (HSiO3/2)s(R2SiO)t, and (RSiO3/2)s(R2SiO)t;
- partially condensed resins which contain silanol described by formulas (HSiO3/2)s(H(HO)SiO)t, (RSiO3/2)s(R(HO)SiO)t, (HSiO3/2)w(H(HO)SiO)s(RSiO3/2)t(R(HO)SiO)z, (HSiO3/2)w(H(HO)SiO)s(R2SiO)t(R2(HO)SiO1/2)z, (RSiO3/2)w(R(HO)SiO)s(R2SiO)t(R2(HO)SiO1/2)z, and (R3SiO1/2)s(SiO2)t((HO)SiO3/2)z;
- and
- triorganosilyl end-capped resins described by formulas (R3SiO1/2)s(HSiO3/2)t, (R3SiO1/2)s(RSiO3/2)t, (R3SiO1/2)s(HSiO3/2)t(RSiO3/2)z, (R3SiO1/2)s(HSiO3/2)t(R2SiO)z, (R3SiO1/2)s(RSiO3/2)t(R2SiO)z, (R3SiO1/2)s(SiO2)t, (R3SiO1/2)w(HSiO3/2)s(R2SiO)t(SiO2)z, and (R3SiO1/2)w(RSiO3/2)s(R2SiO)t(SiO2)z;
- where each R is selected from the group consisting of hydrogen and monovalent hydrocarbon atoms and R can be the same or different, X=0 or 1, m is 8 or greater and the mole fractions of w+s+t+z=1.
Dependencies are inferred from the claim text.