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Laminated glass

  • US 5,227,241 A
  • Filed: 04/09/1992
  • Issued: 07/13/1993
  • Est. Priority Date: 04/09/1991
  • Status: Expired due to Term
First Claim
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1. A laminated glass, comprisingi) a first sheet of glass having a length and a width;

  • ii) a polyvinyl butyral (PVB) insert layered thereon having a length not greater than said length of said first sheet of glass and a width not greater than said width of said first sheet of glass, wherein said PVB insert comprisesa) a first surface PVB layer attached to said first sheet of glass;

    b) a first inner PVB layer attached to said first surface PVB layer; and

    c) a second surface PVB layer attached to said first inner PVB layer; and

    iii) a second sheet of glass having a length not greater than said length of said first sheet of glass and a width not greater than said width of said first sheet of glass;

    wherein each PVB layer comprises a PVB resin and a plasticizer, wherein the ratio of the proportion of said plasticizer of said at least one of said first and second surface PVB layers and said proportion of said plasticizer of said first inner PVB layer being from 1.2;

    1 to 3;

    1;

    wherein said proportion of said plasticizer of said first inner layer is from 15 to 25 parts by weight of plasticizer per 100 parts by weight of PVB resin.

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