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Siloxane-containing compositions curable by radiation to silicone elastomers

  • US 6,846,852 B2
  • Filed: 08/16/2001
  • Issued: 01/25/2005
  • Est. Priority Date: 08/16/2001
  • Status: Expired due to Fees
First Claim
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1. Compositions, which can be crosslinked by radiation to give elastomers or elastomeric coatings, which comprise:

  • (a) high-molecular weight siloxanes with multiple (meth)acrylate functional groups; and

    (b) reinforcing fillers selected from the group consisting of silicone resins and silicone dioxide fillers, wherein the siloxanes (a) have the general structure;


    [R3SiO1/2]a[(Z)nG—

    Ym

    R2SiO1/2]a′

    [R2SiO2/2]b[(Z)nG—

    Ym

    RSiO2/2]b′

    [RSiO3/2]c[SiO4/2]d′

    whereinR is a linear or branched, alkyl, alkenyl or aryl radical which may be substituted with halogen atoms, G(Z)n is a (meth)acrylfunctional radical, wherein G is a (n+1) valent radical derived from a hydroxy compound with 3 to 10 carbon atoms, 1 to 6 hydroxy groups, 0 to 1 carboxylic ester groups and 0 to 2 ether linkages, which may optionally be unsaturated or alkoxylated with ethylene oxide, propylene oxide or mixtures thereof and wherein the organic groups bearing the acrylate radical(s) are attached to the siloxane framework by way of Si—

    C bonds, Y is —

    OOC—

    CHR′



    CH2

    or —

    OOC—

    CHR′

    (CH3)—

    , m is 0 or 1, n is 1-6, Z is —

    OC—

    CR′



    CH2 and may additionally comprise carboxylic acid radicals free of double bond, R′

    is hydrogen or methyl, a is 0-20, a′

    is 2-0, b is 800-10000, b′

    is 0-40, and c is 0-40, d is 0-40, with the proviso that the polymer contains more than two (meth)acrylate groups; and

    wherein the silicone resins of component (b) have the general structure;


    [R13SiO1/2]x[R12R2SiO1/2]x′

    [R1SiO3/2]y[R2SiO3/2]y′

    [SiO4/2]z, whereinR1 is a monovalent alkyl or alkenyl radical with 1 to 4 carbon atoms, phenyl, hydroxy, methoxy or ethoxy, R2 is a (meth)acrylated hydroxyalkyl radical with 1 to 4 carbon atoms in the alkyl group, having a average molecular weight of 500 to 100,000, with the proviso that (x+x′

    )/(y+y′

    +z) is 0.5 to 1.5 and (y+y′

    )/z is 0 to 0.4.

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