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Low molecular weight liquid injection molding resins having a high vinyl content

  • US 5,674,966 A
  • Filed: 04/09/1996
  • Issued: 10/07/1997
  • Est. Priority Date: 06/05/1995
  • Status: Expired due to Term
First Claim
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1. A silicone resin selected from the group consisting of silicone resins having the formula:

  • 
    
    space="preserve" listing-type="equation">M.sub.y M.sup.vi.sub.z D.sub.a D.sup.vi.sub.b T.sub.c T.sup.vi.sub.d Q and M.sub.y M.sup.vi.sub.z D.sub.a D.sup.vi.sub.b T.sub.c T.sup.vi.sub.d ;

    whereQ=SiO4/2 ;

    M=(R2)3 SiO1/2 ;

    Mvi =R1 (R2)2 SiO1/2 ;

    D=R22 SiO2/2 ;

    Dvi =R1 R2 SiO2/2 ;

    T=R2 SiO3/2 ; and

    Tvi =R1 SiO3/2 ;

    where each R1 is independently selected and is a two to twelve carbon atom alkenyl group and where each R2 is independently selected and is a one to eight carbon atom alkyl, aryl, or alkylaryl group and where the subscripts a, b, c, d, and y may be zero or a positive number when Q is present and when Q is absent one of the subscripts c or d must be positive and non-zero and where the subscripts y and z satisfy the following relationship;

    
    
    space="preserve" listing-type="equation">2≦

    (y+z)≦

    4subject to the limitation that z and y satisfy one of the two relationships;

    
    
    space="preserve" listing-type="equation">(z/y)>

    1 or z>

    y.

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