COATED CELLULOSIC ARTICLE AND PROCESS FOR ITS MANUFACTURE

摘要

1525404 Coating solution comprising coatings HOECHST AG 3 Oct 1975 [7 Oct 1974] 40564/75 Heading C3H [Also in Division B2] A solution for the coating of shaped articles of regenerated cellulose is obtained by mixing and subjecting to a dwell time an aqueous alkaline protein solution and an aqueous solution of 1 or more of N-methylolacrylamide, N-methylolmethacrylamide, an alkoxy derivative of either of these with an aliphatic alcohol having 1 to 8 carbon atoms or a compound of formula in which R 1 and R 2 , represent hydrogen or an alkyl group of 1 to 6 carbon atoms, and R 3 represents -(CH 2 ) n - where n is an integer from 1 to 8, or -CH-R 4 wherein R 4 is an alkyl group with 1 to 18 carbon atoms. The protein may be gelatine, zein, collagen, peanut protein or, preferably, casein. In one embodiment casein is dissolved in water to give a 9 to 15% solution and caused to swell. 55% of ammonia solution is added to produce a pH of 8 to 14. The mixture is then mixed with a 1 to 30% aqueous solution of, e.g. N-methylol-N,N1- methylene-bisacrylamide or N-methylol-N,N1- methylene-bismethacrylamide. The resulting mixture contains 5 to 10% by weight of the polyfunctional compound. The liquid is then subjected to a dwell time in the range 2 to 8 hours at room temperature until a viscosity of from 80 to 250 falling-ball seconds is obtained.