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US 4,048,380 AGranted
Cast coated paper and its production and compositions for it
AssigneeStar Paper Limited
InventorsRene C. Blakey, Robert G. Riddell, John Whittaker, John A. Wilson
Life of this patent
Estimating the term…
Abstract
Cast coating compositions, processes of using them and cast coated products are described. The compositions comprise pigment and binder, and the binder includes a polymer which has Tg from 0.degree. to 45.degree. C, Tg-Tf from 5.degree. to 25.degree. C and which is in the form of a latex having an average particle size of less than 0.5 microns.
Claims28
A process of forming a cast coating on a substrate comprising:
- applying to the substrate an aqueous coating composition comprising, per 100 parts by weight solids, at least 60 parts pigment and less than 40 parts of a synthetic resin binder, in which from 40 to 100% dry weight of the binder is a polymer which has a Tg from 0.degree. to 45.degree. C and a Tg--Tf from 5.degree. to 25.degree. C. and which is in the form of a latex having an average particle size of less than 0.5 microns;
- drying the coated substrate so that at least half the water applied with the coating composition is removed;
- applying water to the surface of the coating and molding the coating.
A process according to claim 12 in which the substrate is paper or a paper board.
Dependencies are inferred from the claim text.