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Block copolymer composition for overmolding any nylon

  • US 7,842,747 B2
  • Filed: 10/13/2008
  • Issued: 11/30/2010
  • Est. Priority Date: 03/05/2004
  • Status: Active Grant
First Claim
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1. A thermoplastic elastomer (“

  • TPE”

    ) composition for overmolding a predominantly nylon substrate consisting essentially of,an essentially polyamide-free blend of,(a) an inert filler present in an amount in the range from 5 to 40% by weight of the composition,(b) a plasticizer, unreactive with an ingredient in the composition, present in a minor amount by weight relative to the composition;

    (c) a block copolymer selected from the group consisting of(C1), a polystyrene-polydiene-polystyrene block copolymer (SDS rubber), or an at least partially hydrogenated polystyrene-polydiene-polystyrene block copolymer (SHDS rubber), the SDS and SHDS each having polystyrene endblocks, one at each end of a polydiene midblock, which midblock includes a polymerized vinyl aromatic monomer, the polystyrene endblocks being together present in an amount in the range from about 20% to 30% by weight of the block copolymer, not including the polystyrene in the polydiene midblock, so that (C1) has a weight average molecular weight (“

    Mw”

    ) high enough to be thermally stable at 282°

    C. (540°

    F.),(C2), a functionalized at least partially hydrogenated “

    high rubber”

    SHDS having a functionality of essentially 1%, the “

    small end blocks”

    together present in an amount in the range from about 8-25% by weight (that is, each endblock has a much lower molecular weight than the rubbery midblock), and(C3), a functionalized at least partially hydrogenated SHDS having a functionality of >

    1% but <

    2%, in which the end blocks are together present in an amount in the range from >

    25%-35% by weight;

    in any combination, provided that only (C2) may be present without (C1) and (C3);

    (d) from 0-30% by weight of the composition, of a functionalized polyolefin (FP), the olefin having from 2 to 8 carbon atoms;

    (e) from 0-15% by wt of the composition, of a hydrogenated nonfunctionalized hydrogenated polystyrene-polydiene-polystyrene (SHDS) block copolymer; and

    ,(f) an additive to enhance the useful life of the composition.

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