Polymeric pigments used in paper coating compositions and a proc

Details Polymeric pigments used in paper coating compositions and a proc Polymeric pigments used in paper coating compositions and a proc

1989-02-24

1990-10-16

Nutter, Nathan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524 20, 524 25, 524 26, 524445, 527201, 527207, 427411, 427414, 156328, C08L 8900, C08J 300, C08H 100

Patent

active

049636049

ABSTRACT:
A polymeric or plastic pigment, useful as a partial replacement for the inorganic pigment conventionally employed in paper coating compositions is disclosed. The pigment comprises a copolymer of an animal or vegetable protein and a monomer havingh a glass transition temperature (Tg) greater than about 70.degree. C. polymerized in a surfactant free system. When employed in paper coating compositions the pigment provides a coating of improved gloss and ink holdout, as compared to a coating in which the pigment composition consists only of an inorganic material. Improved water resistance, improved water holding and a potential for reduction in the coating sticking to the calender during the paper finishing process are obtained as compared to conventional polymeric pigments.

REFERENCES:
patent: 4474694 (1984-10-01), Coco et al.
patent: 4607089 (1986-08-01), Riley et al.
patent: 4689381 (1987-08-01), Krinski et al.
Brandrup et al. (editors) Polymer Handbook, John Wiley and Sons, New York, 1975, pp. III-143 and III152-154.

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