Elastomeric meltblown webs
AssigneeFiberweb North America, Inc.
InventorsJohn L. Allan, Jared A. Austin
Life of this patent
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Abstract
The invention is directed to elastomeric meltblown webs having desirable strength and stretch/recovery properties which can be produced at relatively high throughputs and/or relatively low die pressures. The meltblown webs of the invention comprise a blend of (i) a fully hydrogenated diblock or triblock thermoplastic elastomer copolymer or mixtures thereof based on polystyrene and poly(ethylene-butylene) blocks; and (ii) from about 5% by weight up to about 50% by weight of a copolymer of ethylene and acrylic acid or ethylene and a lower alkyl ester of acrylic acid in which the ethylene content ranges from about 5% by weight up to about 50% by weight.
Claims10
A meltblown elastomeric web comprising a blend of:
- (i) a fully hydrogenated diblock or triblock thermoplastic elastomer copolymer or mixtures thereof, having the formula (PS).sub.a -(EB).sub.b or (PS).sub.a -(EB).sub.b -(PS).sub.c wherein (PS) represents polystyrene blocks and wherein (EB) represents poly(ethylene-butylene) blocks and a, b, and c are integers;
- and
- (ii) from about 5% by weight up to about 50% by weight of a plasticizing copolymer selected from the group consisting of copolymers of ethylene and acrylic acid and copolymers of ethylene and a lower alkyl acrylic acid ester wherein the acrylic acid or acrylic acid ester component of the copolymer ranges from about 5% by weight up to about 50% by weight.
Dependencies are inferred from the claim text.