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Insulated glass unit with sealant composition having reduced permeability to gas

  • US 7,687,121 B2
  • Filed: 01/20/2006
  • Issued: 03/30/2010
  • Est. Priority Date: 01/20/2006
  • Status: Expired due to Fees
First Claim
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1. An insulated glass unit comprising at least two spaced-apart sheets of glass in spaced relationship to each other, a low thermal conductivity insulating gas or mixture of gases there between and a gas sealant element including a cured sealant composition resulting from the curing of a curable sealant composition, said cured sealant having an argon permeability coefficient of less than about 900 barrers, comprising:

  • a) at least one silanol-terminated diorganopolysiloxane;

    b) at least one crosslinker for the silanol-terminated diorganopolysiloxane(s) which is an alkylsilicate having the formula;


    (R14O)(R15O)(R16O)(R17O)Siwhere R14, R15, R16 and R17 are chosen independently from monovalent C1 to C60 hydrocarbon radicals;

    c) at least one catalyst for the crosslinking reaction;

    d) a gas barrier enhancing amount of at least one inorganic-organic nanocomposite wherein the inorganic-organic nanocomposite comprises at least one inorganic component which is a layered inorganic nanoparticulate and at least one organic component which is a quaternary ammonium organopolysiloxane having the formula;


    MaDbD′

    c wherein “

    a”

    is 2, and “

    b”

    is equal to or greater than 1 and “

    c”

    is positive;

    M is
    [R3zNR4]3-x-yR1xR2ySiO1/2 wherein “

    x”

    is 0, 1 or 2 and “

    y”

    is either 0 or 1, subject to the limitation that x+y is less than or equal to 2, “

    z”

    is 2, R1 and R2 each independently is a monovalent hydrocarbon group up to 60 carbons;

    R3 is selected from the group consisting of H and a monovalent hydrocarbon group up to 60 carbons;

    R4 is a monovalent hydrocarbon group up to 60 carbons;

    D is
    R5R6SiO1/2 where R5 and R6 each independently is a monovalent hydrocarbon group up to 60 carbon atoms; and

    D′

    is
    R7R8SiO2/2 where R7 and R8 each independently is a monovalent hydrocarbon group containing amine with the general formula;


    [R9aNR10]wherein “

    a”

    is 2, R9 is selected from the group consisting of H and a monovalent hydrocarbon group up to 60 carbons;

    R10 is a monovalent hydrocarbon group up to 60 carbons; and

    ,e) at least one solid polymer having a permeability to gas that is less than the permeability of the crosslinked diorganopolysiloxane(s).

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