Low stress relaxation elastomeric materials
AssigneeThe Procter & Gamble Company
InventorsJohn Jianbin Zhang, John Joseph Curro, Michele Ann Mansfield
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Abstract
A low stress relaxation elastomeric material comprises a block copolymer having an elasotmeric soft block portion and thermoplastic hard block portions, at least one vinylarene resin and mineral oil. The elasotmeric material may be used in a film comprising an elastomeric layer and at least one substantially less elastomeric skin layer. The skin layer comprises a thermoplastic polymer such as polyolefins. The film exhibits desired elastic and stress relaxation properties at body temperature. The film is useful in forming a macroscopically-expanded, three-dimensional elastomeric web.
Claims35
A low stress relaxation elastomeric film suitable for being formed into a porous, macroscopically-expanded, three-dimensional elastomeric web, said elastomeric material comprising an elastomeric layer having opposed first and second surfaces and at least one substantially less elastomeric skin layer substantially continuously joined to said first surface of the elastomeric layer, said elastomeric layer comprising:
- a) from about 20 to about 80 wt % of an elastomeric block copolymer, said copolymer comprising from about 10% to about 80% by weight of at least one hard block and from about 20% to about 90% by weight of at least two soft block;
- b) from about 3 to about 60 wt % of at least one vinylarene resin;
- and
- c) from about 5 to about 60 wt % of a processing oil;
- wherein the elastomeric film has a stress relaxation of less than about 20 percent at 200% elongation at room temperature and a stress relaxation of less than about 45 percent after about 10 hours at 100° F. and 50% elongation.
An article to be worn adjacent to a person's body, said article comprising
- an elasticized portion comprising
- a low stress relaxation elastomeric film comprising
- an elastomeric layer having opposed first and second surfaces;
- and
- at least one substantially less elastomeric skin layer substantially continuously joined to said first surface of the elastomeric layer, said elastomeric layer comprising:
- a) from about 20 to about 80 wt % of an elastomeric block copolymer, said copolymer comprising from about 10% to about 80% by weight of a hard block derived from vinylarene monomers selected from the group consisting of styrenes, α-methyl styrenes, other styrene derivatives, and mixtures thereof and from about 20% to about 90% by weight of a soft block derived from olefinic monomers selected from the group consisting of ethylenes, propylenes, butylenes, isoprenes, butadienes, and mixtures thereof;
- b) from about 3 to about 60 wt % of at least one vinylarene resin having a glass transition temperature from about 58° C. to about 180° C.;
- and
- c) from about 5 to about 60 wt % of a processing oil;
- wherein the elastomeric film has a stress relaxation of less than about 20 percent at 200% elongation and room temperature and a stress relaxation of less than about 45 percent after about 10 hours at 100° F. and 50% elongation.
A low stress relaxation elastomeric material suitable for being formed into a porous, macroscopically-expanded, three-dimensional elastomeric web, said elastomeric material comprising:
- a) from about 20 to about 80 wt % of an elastomeric triblock copolymer comprising a polyolefin midblock and two polystyrene endblocks, the copolymer is selected from the group consisting of poly(styrene-ethylene/butylene-styrene), hydrogenated poly(styrene-isoprene/butadiene-styrene), poly(styrene-isoprene-styrene), poly(styrene-butylene-styrene), poly(styrene-ethylene/propylene-styrene), and mixtures thereof;
- b) from about 3 to about 60 wt % of at least one vinylarene resin having a glass transition temperature from about 58° C. to about 180° C.;
- and
- c) from about 5 to about 60 wt % of mineral oil.
Dependencies are inferred from the claim text.