Patent GB-423236-A (GB)
Title: Improvements in or relating to moistureproof materials, processes of making the same, and moistrureproofing compositons therefor
IPC: C08J7/048
Filed: 1933-04-24
Abstract: A waterproof material is formed by applying to a sheet of a cellulose organic ester, a moisture-proofing composition containing a vinyl resin dissolved in a liquid which is substantially a non-solvent for the cellulose organic ester but which contains a softening agent for the ester, whereby the moisture-proofing composition is caused to adhere securely to the ester sheet, said softening agent having a slower rate of evaporation than the balance of the solvents in the vinyl resin solution.  The vinyl resin is preferably obtained by the conjoint polymerization of vinyl chloride and vinyl acetate, and the moisture-proofing composition may contain also other resins, gums, waxes, plasticizers and dyes, while anthracene or phenanthrene may be added to increase the lustre of the coating in the final product. Suitable solvents for the vinyl resin are toluene, butylacetate, ethylene dichloride and propylene dichloride, while beta-butoxyethyl alcohol is specified as a softening agent. According to examples:--(1) A cellulose acetate film is coated with a composition containing vinyl chloride resin, ceresin wax, and di-phthalate as a plasticizer, dissolved in a mixture of toluene and ethylene dichloride with the addition of 5 per cent of beta-butoxyethyl alcohol; (2) A cellulose ester film is coated with a composition containing a resin resulting from the conjoint polymerization of vinyl chloride and vinyl acetate, oxidized ester gum, paraffin wax and a plasticizer in the same solvent mixture.  According to the Specification as open to inspection under Sect. 91, the softening agent may be omitted, but this subject-matter does not appear in the Specification as accepted.ALSO:A waterproof material is formed by applying to a sheet of a cellulose organic ester, a moisture-proofing composition containing a vinyl resin dissolved in a liquid which is substantially a non-solvent for the cellulose organic ester but which contains a softening agent for the ester, whereby the moisture-proofing composition is caused to adhere securely to the ester sheet, said softening agent having a slower rate of evaporation than the balance of the solvents in the vinyl resin solution.  The vinyl resin is preferably obtained by the conjoint polymerization of vinyl chloride and vinyl acetate, and the moisture-proofing composition may contain also other resins, gums, waxes, plasticizers and dyes, while anthracene or phenanthrene may be added to increase the lustre of the coating in the final product.  Suitable solvents for the vinyl resin are toluene, butylacetate, ethylene dichloride and propylene dichloride, while betabutoxyethyl alcohol is specified as a softening agent. According to examples:--(1) A cellulose acetate film is coated with a composition containing vinyl chloride resin, ceresin wax, and di-phthalate as a plasticizer, dissolved in a mixture of toluene and ethylene dichloride with the addition of 5 per cent of beta-butoxyethyl alcohol.  (2) A cellulose ester film is coated with a composition containing a resin resulting from the conjoint polymerization of vinyl chloride and vinyl acetate, oxidized ester gum, paraffin wax and a plasticizer in the same solvent mixture.  According to the Specification as open to inspection under Sect. 91, the softening agent may be omitted, but this subject-matter does not appear in the Specification as accepted.