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Thickening silicones with elastomeric silicone polyethers

  • US 5,811,487 A
  • Filed: 12/16/1996
  • Issued: 09/22/1998
  • Est. Priority Date: 12/16/1996
  • Status: Expired due to Term
First Claim
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1. A method of making a silicone elastomer comprising reacting:

  • (A) an .tbd.Si--H containing polysiloxane of the formula R3 SiO(R'"'"'2 SiO)a (R"HSiO)b SiR3 or the formula (R'"'"'2 SiO)a (R"HSiO)b, and optionally an .tbd.Si--H containing polysiloxane of the formula HR2 SiO(R'"'"'2 SiO)c SiR2 H or an .tbd.Si--H containing polysiloxane of the formula HR2 SiO(R'"'"'2 SiO)a (R"HSiO)b SiR2 H, where R, R'"'"', and R" are alkyl groups with 1-6 carbon atoms, a is 0-250, b is 1-250, and c is 0-250; and

    (B) a mono-alkenyl polyether of the formula CH2

    CH(CH2)x O(CH2 CH2 O)y (CH2 CH3 CHO)z T, or the formula CH2

    CH-Q-O(CH2 CH2 O)y (CH2 CH3 CHO)z T, where T is hydrogen, a C1 -C10 alkyl group, an aryl group, or a C1 -C20 acyl group;

    Q is a divalent linking group containing unsaturation;

    x is 1-6, y is zero or 1-100; and

    z is zero or 1-100;

    provided y and z are both not zero;

    in the presence of a platinum catalyst, until an .tbd.Si--H containing polysiloxane with polyether groups is formed; and

    reacting;

    (C) the .tbd.Si--H containing polysiloxane with polyether groups;

    (D) an unsaturated hydrocarbon selected from the group consisting of alpha, omega-dienes of the formula CH2

    CH(CH2)x CH═

    CH2, alpha, omega-diynes of the formula CH.tbd.C(CH2)x C.tbd.CH, and alpha, omega-ene-ynes of the formula CH2

    CH(CH2)x C.tbd.CH, where x is 1-20;

    in the presence of(E) a solvent selected from the group consisting of (i) organic compounds, (ii) compounds containing a silicon atom, (iii) mixtures of organic compounds, (iv) mixtures of compounds containing a silicon atom, and (v) mixtures of organic compounds and compounds containing a silicon atom; and

    in the presence of a platinum catalyst, until a silicone elastomer is formed by crosslinking and addition of .tbd.SiH across double or triple bonds in the unsaturated hydrocarbon.

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