GB1379881A - Paper making process - Google Patents

Abstract

1379881 Coated, paper MISHIMA PAPER MFG CO Ltd 23 Dec 1971 [28 July 1971] 60154/71 Heading B2E [Also in Division D2] Paper is produced by 1) making paper using as the paper-making stock a fibrous cellulose ether which is soluble in an aqueous alkaline solution but not in water, or a mixture of at least 0.2 parts by weight of said cellulose ether and one part by weight of paper-making stock, 2) applying to the resulting paper an alkaline aqueous surface treatment agent containing a film-forming substance which is soluble in an aqueous alkali but not in water, and thereafter. drying the paper before substantial reaction takes place between the cellulose ether and the surface treatment agent. The cellulose ether may be selected from carboxyalkyl celluloses, polyvalent metal salts thereof, hydroxyalkyl celluloses, cyanoalkyl celluloses, carbamyalkyl celluloses and sulphoalkyl celluloses. The polyvalent metal salt may be a salt selected from an aluminium, tin, zinc, or iron salt. The other paper-making stock may be selected from rayon, linter, bast and straw pulp. The filmforming substance may be selected from the partially saponified product of polyvinyl acetate, ethylene-acrylic acid copolymer, ethyl acrylate-methacrylic acid copolymer, 2-ethylhexyl acrylate-methacrylic acid copolymer, casein and -cellulose ethers. The saponified product of polyvinyl acetate, sodium alginate, gum arabic, modified starches and acrylic ester-type copolymers may also be present.