(a) coating organic pigment particles, which are diketopyrrolopyrroles, with one or more films of a preformed polymer
by adsorption of from 1 to 5% by weight of the polymer, based on the pigment, onto the surface of the pigment
particles at room temperature, the polymer being selected from the group consisting of polyvinylpyrrolidone
homopolymers and copolymers; and
(b) admixing the coated pigment particles with a polyolefin.
27. A process for the warp-free pigmenting of polyolefins, which comprises:
(a) coating organic pigment particles, which are diketopyrrolopyrroles, with one or more films of a preformed polymer
by adsorption of 1 to 10% by weight of the polymer, based on the pigment, onto the surface of the pigment particles
at room temperature, the polymer being a polyvinylpyrrolidone-vinyl acetate copolymer; and
(b) admixing the coated pigment particles with a polyolefin.
THE REFERENCES OF RECORD
As evidence of obviousness, the examiner relies upon the following references.
Hopfenberg et al. 3,904,562 Sep. 9, 1975
(Hopfenberg)
Loch 4,388,435 Jun. 14, 1983
Martin 4,771,086 Sep. 13, 1988
Bugnon et al. 4,808,230 Feb. 28, 1989
(Bugnon)
Kamada et al. 4,957,949 Sep. 18, 1990
(Kamada)
THE REJECTIONS
Claims 12, 19, 22, 24 and 26 stand rejected under 35 U.S.C. § 103 as being unpatentable over Hopfenberg in view
of Kamada.
Claims 12, 19, 22, 24 and 26 stand rejected under 35 U.S.C. § 103 as being unpatentable over Hopfenberg as
modified by Kamada as applied to claims 12, 19, 22, 24 and 26 above and further in view of Bugnon.
Claim 27 stands rejected under 35 U.S.C. § 103 as being unpatentable over Martin as modified by Hopfenberg in
view of Bugnon and further in view of Loch.1
1
2
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