Patent GB-315228-A (GB)
Title: Improvements in and relating to compositions adapted for use in waterproofing and to articles or bodies treated therewith
IPC: D21H23/66
Filed: 1929-07-09
Abstract: 315,228. Du Pont de Nemours & Co., E. I., (Assignees of Burke, C. E., and Lawson, W. E.). July 9, 1928, [Convention date]. Waterproofing; proofing-compositions. - Cartridge cases are impregnated with a solution of a polymerized substituted ethylene, for example metastyrene, or a polymerized homologue thereof, or a mixture of said substances. Polvmerized vinyl chloride or a polymerized vinyl ester, for example, vinyl acetate, may be used. Paper, or articles made therefrom, such as cartridge cases, may be impregnated with solutions of polymerized vinyl enters of higher fatty acids, polymers of vinyl ethers, or of allylene compounds, homologues of metastyrene such as polymers of ethyl styrene and of paramethyl styrene, or polymers of other highly unsaturated hydrocarbons. The composition may be used as a spraying or dipping lacquer or as an impregnating composition and the materials or articles may be baked after treatment. Softeners used may be dibutyl phthalate, tricresyl phosphate, and butyl stearate for metastyrene and its homologues, and dibutyl phthalate, glyceryl dibenzyl ether, drying oils such as tung, linseed or perilla oil, or compatible vinyl derivatives for polymerized vinyl chloride products. Cartridge cases treated with polymerized vinyl chloroacetate may be subjected to baking for two hours at 165‹ C. or for a shorter period at higher temperatures. Loaded cartridges of the paraffinimpregnated type are washed with a solvent such as benzene or gasoline, or subjected to a buffing treatment, before impregnation. Examples are : (1) A composition consisting of 18 parts by weight of metastyrene, 3.6 parts of tricresyl phosphate, and 100 parts of solvent comprising 20 parts of ethyl acetate, 30 parts of butyl acetate, 30 parts of toluene and 20 parts of xylene is used as a spraying or dipping lacquer for shot-gun cartridges which have been impregnated with paraffin. (2) A composition consisting of 18 parts by weight of the alpha polymer of vinyl chloride, 18.5 parts of blown tung oil containing 0.5 part of cobalt linoleate, in 182 parts of a solvent consisting of 36 parts of acetone, 36 parts of ethyl acetate, 45 parts of butyl acetate, 45 parts of chlorobenzene, and 20 parts of hexa-hydro-phenol acetate, is used as in example 1. (3) 24 parts of polymerized vinyl chloroacetate in 100 parts of a solvent consisting of 40 parts of ethyl acetate, 35 parts of butyl acetate, 15 parts of acetone and 10 parts of the acetic ester of ethylene-glycol mono-ethyl-ether, used as before. (4) 11 parts of acetone-soluble vinyl chloride polymer and 11 parts of polymerized vinyl acetate in 100 parts of a solvent consisting of 20 parts of acetone, 20 parts of ethyl acetate, 30 parts of butyl acetate and 30 parts of chlorobenzene, used as before. (5) 37 parts of the polymerization product of a mixture of vinyl chloride and vinyl acetate in 100 parts of a solvent consisting of 25 parts of acetone, 25 parts of ethyl acetate, 20 parts of butyl acetate and 30 parts of toluene, forms a composition of a great viscosity. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the use of polymerized diolefines, or polyolefines, and of polymerizable as well as polymerized substituted ethylene &c. This subject-matter does not appear in the Specification as accepted. Reference has been directed by the Comptroller to Specifications 311,700 and 312,344, [both in Class 95, Paints &c.].