Claims
- 1. A molded thermoplastic elastomer composition consisting essentially of a dispersed phase of a halobutyl rubber fully cross linked by dynamic vulcanization in the presence of at least 20 parts of a continuous matrix of a mixture formed from 10 to 60 parts of polypropylene and 1 to 90 parts of a thermoplastic elastomeric block copolymer having terminal polystyrene units and olefinic elastomeric mid block units, said parts being based upon 100 parts of said rubber, said composition having a compression set less than about forty percent, an oxygen transmission rate of less than 500 cc/m.sup.2 /day, a moisture vapor transmission rate of less than 2 gm/m.sup.2 /day, and a needle penetration force of less than 2000 grams.
Parent Case Info
This is a continuation in part of application Ser. No. 07/288,443 filed Dec. 22, 1988, now U.S. Pat. No. 4,975,308.
US Referenced Citations (10)
Foreign Referenced Citations (1)
Number |
Date |
Country |
8705310 |
Sep 1987 |
WOX |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
288443 |
Dec 1988 |
|