Patent GB-378608-A (GB)
Title: Manufacture of lacquers, films, coating preparations, adhesives, impregnating agents and the like
IPC: C09D129/14
Filed: 1931-06-29
Abstract: The resins obtained by condensing polyvinyl alcohols with aldehydes, as described for example in Specification 337,806, [Class 2 (iii), Dyes etc.], are used in solution in organic solvents as lacquers, coating-compositions, adhesives, impregnating-solutions, and for making films. The resins may be prepared by saponifying a polyvinyl ester in the presence of an aldehyde, the polyvinyl alcohol condensing with the aldehyde as soon as it is formed. Solvents mentioned are chlorinated hydrocarbons, glycol ethers, esters, alcohols, hydrocarbons, and mixtures of these. The solutions may contain dyes, pigments, bronze, etc., and may be applied on wood, paper, leather, glass, porcelain etc., for stiffening hats and caps, for binding fibrous materials, and for securing wood to wood, glass to glass, leather to wood, etc. Marbled or veined effects are obtained by using a spraying pistol so that threads are formed by evaporation. In examples (1) a resin prepared from polyvinyl alcohol and acetaldehyde at 40-60 DEG C. in the presence of acid and excess of water is dissolved in 3 parts of alcohol and used as a coating on wood; metals, glass, stoneware, masonry, paper, artificial wood, etc., leather, textiles, etc., and over-coatings of oil varnish may be applied, or of varnish containing rubber or a cellulose derivative, e.g. a lacquer containing nitro cellulose of low viscosity, tricresyl phosphate, colophony glycerine ester, butyl acetate, butanol, benzine or benzene, and ethyl acetate; (2) a resin from polyvinyl alcohol and formaldehyde is dissolved in methylene chloride, and kneaded with iron oxide and soot forming a composition for stiffening caps; (3) a similar solution is applied on glass, and the solvent allowed to evaporate; two sheets of the coated glass are placed with the coated sides in contact and united by pressing at 10-15 atmospheres at 90-120 DEG C; (4) a resin is prepared by saponifying polyvinyl acetate in alcoholic solution with concentrated sulphuric acid, in the presence of paraformaldehyde which reacts with the polyvinyl alcohol formed, and the product is dissolved in 4 parts of alcohol and \ba1/5\be part of di-butyl-phthalate; cotton is impregnated with this solution to form a waterproof material of high insulating power; (5) an alcoholic solution of a highly viscous polyvinyl acetate and acetaldehyde is heated with hydrochloric acid, and paper webs are impregnated with the neutralized solution, dried, superposed and pressed while warm, to form a material resistant to chemical action and of high insulating power; (6) a resin solution is prepared by saponifying polyvinyl acetate in benzene with phosphoric acid in the presence of benzaldehyde, and the neutralized solution is used for impregnating felt hats, plaited straw, linings, etc.; the hats can be re-shaped by heating to 80-100 DEG C.; (7) an asbestos brake-band is impregnated with the solution of example (1); (8) a resin prepared by condensing a highly viscous polyvinyl alcohol with aldol in alcoholic solution, is dissolved in alcohol, toluene and solvent naphtha, and red lead is incorporated with the solution forming an antirust paint; (9) an antirust paint is prepared from titanium oxide and a solution of the resin of example (1) in acetone and cyclohexane; (10) a red paint for wood, fast to light and water, is prepared from 1 : 4-diamino-2 : 3-diphenoxy-anthraquinone (see Specification 26944/11, [Class 2 (iii), Dyes etc.],) and a solution in benzene and alcohol of the resin obtained from polyvinyl alcohol and formaldehyde; (11) a resin from polyvinyl alcohol and formaldehyde is dissolved in chloroform or chloroform and methylene chloride, and the solution is used for coating metal, p wood, etc; and (12) a resin prepared by condensing cyclohexanone, phenol and formaldehyde in alkaline aqueous solution at 100 DEG C. is ground with Lithol Fast Scarlet RN. powder in a solution of a polyvinyl alcohol formaldehyde resin in chloroform, with or without benzene-alcohol, or dioxane, and the composition is used for coating leather by brushing. The Specification as open to inspection under Sect. 91 (3) (a) describes also in example (5) the preparation of a thin film for use as a transparent paper by evaporating on a sheet of glass a solution of the resin obtained from polyvinyl alcohol and formaldehyde; the film may also contain tricresyl phosphate, castor oil, and a dye; in example (17) the preparation of the resin of example (8) above by heating polyvinyl alcohol with aldol and ethyl alcohol in the presence of aqueous hydrochloric acid to 100 DEG C. in an autoclave for 8 hours; and in example 18 the preparation of a resin for use as in example (9) above by heating polyvinyl alcohol with acetaldehyde and ethyl alcohol in the presence of acetic acid for \ba1/2\be hour at 70-80 DEG C. This subject-matter does not appear in the Specification as accepted.ALSO:The resins obtained by condensing polyvinyl alcohols with aldehydes, as described for example in Specification 337,806, [Class 2 (iii), Dyes etc.], are used in solution in organic solvents for various purposes, including the treatment of textiles. The resins may also be prepared by saponifying a polyvinyl ester in the presence of an aldehyde, the polyvinyl alcohol condensing with the aldehyde as soon as it is formed. Solvents mentioned are chlorinated hydrocarbons (methylene chloride, chloroform), glycol ethers, dioxane, esters, alcohols, acetone, hydrocarbons (benzene, toluene, naphtha, cyclohexane), and mixtures of these. In examples (1) a resin prepared from polyvinyl alcohol and acetaldehyde at 40-60 DEG C. in the presence of acid and excess of water is dissolved in alcohol and used as a coating on textiles; the coating may be covered with an oil varnish or varnish containing rubber or a cellulose derivative, e.g. a lacquer containing nitrocellulose of low viscosity, tricresyl phosphate, colophony glycerine ester, butyl acetate, butanol, benzine or benzene, and ethyl acetate; (2) a resin is prepared by saponifying polyvinyl acetate in alcoholic solution with concentrated sulphuric acid, in the presence of paraformaldehyde which reacts with the polyvinyl alcohol formed, and the product is dissolved in alcohol and dibutylphthalate; cotton is impregnated with this solution to form a water-proof material of high insulating power; (3) an impregnating solution for paper is prepared by heating a highly viscous polyvinyl acetate solution with acetaldehyde and hydrochloric acid; (4) a resin solution is prepared by saponifying polyvinyl acetate in benzene with phosphoric acid in the presence of benzaldehyde, and the neutralized solution is used for impregnating linings; (5) a resin is prepared by condensing a highly viscous polyvinyl alcohol with aldol in alcoholic solution; (6) a resin is prepared by condensing cyclohexanone, phenol and formaldehyde in alkaline aqueous solution at 100 DEG C., and is used in association with a polyvinyl alcohol-aldehyde resin prepared as described above.  The Specification as open to inspection under Sect. 91 (3) (a) describes also in example (17) the preparation of the resin of example (5) above by heating polyvinyl alcohol with aldol and ethyl alcohol in the presence of aqueous hydrochloric acid to 100 DEG  C. in an autoclave for 8 hours; and in example (18) the preparations of a resin by heating polyvinyl alcohol with acetaldehyde and ethyl alcohol in the presence of acetic acid for 30 mins. at 70 DEG -80 DEG  C.  This subject-matter does not appear in the Specification as accepted.ALSO:The resins obtained by condensing polyvinyl alcohols with aldehydes, as described for example in Specification 337,806, [Class 2 (iii), Dyes etc.], are used in solution in organic solvents as lacquers, coating-compositions, adhesives, impregnating-solutions, and for making films. The resins may be prepared by saponifying a polyvinyl ester in the presence of an aldehyde, the polyvinyl alcohol condensing with the aldehyde as soon as it is formed.  Solvents mentioned are chlorinated hydrocarbons, glycol ethers, esters, alcohols, hydrocarbons, and mixtures of these.  The solutions may contain dyes, pigments, bronze, etc., and may be applied on wood, paper, leather, glass, porcelain, etc., for stiffening hats and caps, for binding fibrous materials, and for securing wood to wood, glass to glass, leather to wood, etc. In example (3) a resin from polyvinyl alcohol and formaldehyde is dissolved in methylene chloride, the solution is applied on glass and the solvent allowed to evaporate; two sheets of the coated glass are placed with the coated sides in contact and united by pressing at 10 to 15 atmospheres at 90-120 DEG C.; and in example (5) an alcoholic solution of a highly viscous polyvinyl acetate and acetaldehyde is heated with hydrochloric acid, and paper webs are impregnated with the neutralized solution, dried, superposed and pressed while warm to form a material resistant to chemical action and of high insulating power.