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Stretchable fastening tape for disposable diaper

  • US 4,787,897 A
  • Filed: 05/29/1987
  • Issued: 11/29/1988
  • Est. Priority Date: 06/03/1986
  • Status: Expired due to Term
First Claim
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1. A stretchable, fastening tape comprising a middle portion made of an elastic material and two end portions made of a non-elastic material and integrally bonded through respective boundary regions to said middle portion, said end and middle portions having substantially the same structural dimensions and wherein said elastic material is a composition comprising (a) and (b), or (a), (b) and (c) as defined below, and said non-elastic material is (d) as defined below:

  • (a) 100 parts by weight of a hydrogenated block copolymer represented by a general formula, A-(B-A)n, wherein A is a block polymer of a monovinyl-substituted aromatic hydrocarbon, B is an elastomeric block polymer of a conjugated diene, the weight ratio of A to B being 20/80 to 40/60, and n is an integer of 1 to 4;

    (b) 10 to 80 parts by weight of a resin having a melting or softening point of 80°

    C. or higher and an average molecular weight of 400 to 2,000;

    (c) 0 to 50 parts by weight of a thermoplastic olefin resin; and

    (d) a resin selected from the group consisting of polyethylene, polypropylene, poly(ethylene-propylene), poly(ethylene-vinyl acetate), and poly(styrene-butadiene), used along or as a composite resin thereof.

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