Appeal No. 1997-1069
Application No. 08/234,959
1. A method for the grafting of a
monomer onto a polyolefin in the presence
of an organic peroxide, said polyolefin
being a polyolefin that, when molten,
undergoes cross-linking in the presence of
the organic peroxide, said method
comprising:
(a) admixing in an extruder an admixture of
(i) said polyolefin, (ii) 25 to 6000 ppm, based
on the weight of the polyolefin, of an organic
peroxide coated onto a carrier polymer, the
amount of organic peroxide coated onto said
carrier polymer being at least 0.2% by weight of
the carrier polymer, and (iii) up to 5%, by
weight of the polyolefin, of a grafting monomer
capable of being grafted onto the polyolefin in
the presence of the organic peroxide;
(b) heating the admixture to a temperature
above the melting point of both the polyolefin
and the carrier polymer under admixing
conditions to effect grafting of said grafting
monomer onto the polyolefin, said carrier
polymer undergoing chain scission in preference
to cross-linking in the presence of the organic
peroxide at said temperature; and
(c) extruding grafted polyolefin from the
extruder.
In support of his rejection, the examiner relies on the
following sole prior art reference:
Furrer et al. (Furrer) 5,112,919 May 12,
1992
(Filed Oct. 30, 1989)
Claims 1 through 12 stand rejected under 35 U.S.C. § 103
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