Patent GB-402877-A (GB)
Title: Improved articles made of or containing cellulose derivatives
IPC: C08J7/04
Filed: 1932-07-05
Abstract: Articles made of or containing cellulose esters or ethers are rendered resistant to water, acids, alkalies, gases or vapours, and organic solvents, by coating with a material comprising a polymerised vinyl hydrocarbon, in particular, polymerised styrene or its homologues such as ethylstyrene or p-methylstyrene. The coating must not contain a natural or synthetic resin.  The articles treated may be sheets, photographic films, foils for wrapping, fountain-pen parts, containers, screw caps and other closures for bottles, toilet articles, and parts of electrical apparatus.  The coating of textiles is excluded.  The method is particularly applicable to articles made of acetone-soluble cellulose acetate, but it may be used with articles made from other organic esters of cellulose, simple or mixed, from nitrocellulose, or from ethyl or benzyl cellulose. Plasticisers or softening agents such as aryl phosphates and esters of phthalic acid, drying oils, cellulose ethers, and pigments or colouring matters may be incorporated in the coating; and the polymerised vinyl hydrocarbon is preferably applied as a solution in an organic solvent, in particular, hydrocarbons or halogenated hydrocarbons, and such solution may contain medium or high boiling solvents, or softening agents for the cellulose ester or ether.  In the case of films, foils and other flexible articles the proportion of softening agent in the coating should be relatively high.  After coating, the articles may be baked to increase the resistance of the coating.  The following are examples of coating compositions for cellulose acetate articles:--polymerised styrene, acetone, toluene; polymerised styrene, methylene chloride, toluene, dioxane, butyl acetate.  The Specification as open to inspection under Sect. 91 refers to the addition of synthetic resins to the coating composition.  This subject-matter does not appear in the Specification as accepted.ALSO:Articles made of or containing cellulose esters or ethers are rendered resistant to water, acids, alkalies, gases or vapours, and organic solvents, by coating with a material comprising a polymerised vinyl hydrocarbon, in particular, polymerised styrene or its homologues such as ethylstyrene or p-methylstyrene. The coating must not contain a natural or synthetic resin.  The articles treated may be sheets, photographic films, foils for wrapping, fountain-pen parts, containers, screw caps and other closures for bottles, toilet articles, and parts of electrical apparatus.  The coating of textiles is excluded.  The method is particularly applicable to articles made of acetone-soluble cellulose acetate, but it may be used with articles made from other organic esters of cellulose, simple or mixed, from nitrocellulose, or from ethyl or benzyl cellulose.  Plasticisers or softening agents such as aryl phosphates and esters of phthalic acid, drying oils, cellulose ethers, and pigments or colouring matters may be incorporated in the coating; and the polymerised vinyl hydrocarbon is preferably applied as a solution in an organic solvent, in particular, hydrocarbons or halogenated hydrocarbons, and such solution may contain medium or high boiling solvents, or softening agents for the cellulose ester or ether. In the case of films, foils and other flexible articles the proportion of softening agent in the coating should be relatively high.  After coating, the articles may be baked to increase the resistance of the coating.  The following are examples of coating compositions for cellulose acetate articles--polymerised styrene, acetone, toluene; polymerised styrene, methylene chloride, toluene, dioxane, butyl acetate.  The Specification as open to inspection under Sect. 91 refers to the addition of synthetic resins to the coating composition.  This subject-matter does not appear in the Specification as accepted.ALSO:Celluloid articles are rendered resistant to water, acids, alkalies, gases or vapours, and organic solvents, by coating with a material comprising a polymerised vinyl hydrocarbon, in particular, polymerised styrene or its homologues such as ethylstyrene or p-methylstyrene.  The coating must not contain a natural or synthetic resin.  The articles treated may be sheets, photographic films, foils for wrapping, fountain-pen parts, containers, screw caps and other closures for bottles, toilet articles, and parts of electrical apparatus.  The method is particularly applicable to articles made of acetone-soluble cellulose acetate, but it may be used with articles made from other organic esters of cellulose, simple or mixed, from nitrocellulose, or from ethyl or benzyl cellulose.  Plasticisers or softening agents such as aryl phosphates and esters of phthalic acid, drying oils, cellulose ethers, and pigments or colouring matters may be incorporated in the coating; and the polymerised vinyl hydrocarbon is preferably applied as a solution in an organic solvent, in particular, hydrocarbons or halogenated hydrocarbons, and such solution may contain medium or high boiling solvents, or softening agents for the cellulose ester or ether. In the case of films, foils and other flexible articles the proportion of softening agent in the coating should be relatively high.  After coating, the articles may be baked to increase the resistance of the coating.  The following are examples of coating compositions for cellulose acetate articles:-polymerised styrene, acetone, toluene; polymerised styrene, methylene chloride, toluene, dioxane, butyl acetate.  The Specification as open to inspection under Sect. 91 refers to the addition of synthetic resins to the coating composition.  This subject-matter does not appear in the Specification as accepted.