| 摘要 |
<p>1463340 Aqueous polymeric coating compositions RHONE PROGIL 13 Nov 1974 [15 Nov 1973 1 March 1974 2 Oct 1974] 49107/74 Heading C3P A paper or cardboard coating composition comprises an aqueous dispersion of a binder and a pigment, 5-30 wt. per cent of the pigment comprising particles of a non-filmogenic synthetic polymer (i.e. non-film-forming under paper &c. coating conditions) which is insoluble in the binder, the particles having diameters of 0À05 to 0À30 microns. The non-filmogenic polymer is preferably one which is predominantly hydrocarbon, but a long list of suitable polymers, including styrene polymers, vinyl chloride polymers, polysulphones, polyolefins, acrylic polymers, polyesters, polyvinylacetate, polyallylacetate and polyvinyl propionate, is given. In the examples, the binder used is a carboxylated butadiene/styrene copolymer latex, but other synthetic polymers, and natural binders such as starch, proteins and casein, may also be used. Suitable pigments are kaolin (preferred), alumina, satin white and calcium carbonate.</p> |
