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.
Claims12
An article to be worn adjacent to a person's body, the 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 less elastomeric skin layer substantially continuously joined to the first surface of the elastomeric layer, the elastomeric layer comprising:
- a) from about 20 to about 80 wt % of an elastomeric block copolymer, the copolymer comprises from about 10% to about 80% by weight of a hard block derived from vinylarene monomers, and from about 20% to about 90% by weight of a soft block derived from olefinic monomers;
- 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 a permanent set of the skin layer is at least about 20% greater than a permanent set of the elastomeric layer, and 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.
Dependencies are inferred from the claim text.