Appeal No. 1998-1909
Application 08/437,489
THE INVENTION
The appellants claim a thermoplastic elastomeric composition
formed by dynamically crosslinking a recited crystalline polymer
of propylene and an amorphous, unsaturated elastomeric olefin
polymer. Claim 1 is illustrative:
1. A thermoplastic elastomeric composition consisting
essentially of:
A) from 10 to 80% by weight of at least one crystalline
polymer of propylene containing from 0.05 to 15% in moles of
ethylenic unsaturation and having an isotactic index greater than
70%, or a mixture of the above polymer with a saturated
thermoplastic olefin polymer in quantities lower than or equal to
80% by weight of (A);
B) from 20 to 90% by weight of an amorphous, unsaturated
elastomeric olefin polymer;
said composition having been dynamically cross-linked with a
cross-linking agent comprising a free radical generator, and
wherein said ethylenic unsaturation is incorporated into said
crystalline polymer by reacting propylene with at least one diene
selected from the group consisting of 1,3-butadiene, isoprene,
1,3-pentadiene, 1,4-hexadiene, dicyclopentadiene and 2-
ethylidene-5-norbornene.
THE REFERENCES
Fischer 3,806,558 Apr. 23, 1974
Cecchin et al. (Cecchin) 0 171 025 Feb. 12, 1986
(European patent application)
THE REJECTION
Claims 1, 2, 4 and 5 stand rejected under 35 U.S.C. § 103 as
being unpatentable over Cecchin in view of Fischer.
-2-2
Page: Previous 1 2 3 4 5 6 7 Next
Last modified: November 3, 2007