Patent GB-964698-A (GB)
Title: Coated fibrous products, compositions and methods for making them
IPC: D06M15/07
Filed: 1960-09-01
Abstract: A composition comprises 25-50% of cellulose acetate-propionate and/or cellulose acetate-butyrate and 50-75% of a copolymer consisting of 1-10% of methacrylate units of the formula: <FORM:0964698/C3/1> and 70-99% of acrylate units of the formula: <FORM:0964698/C3/2> where R is an alkyl radical, the methacrylate and acrylate percentages being calculated on the weight of the copolymer. A preferred copolymer comprises 1-10% glycidyl methacrylate and 90-99% of at least one C1-C18 alkyl acrylate, e.g. methyl-, ethyl-, n- and iso-propyl-, n- and other butyl, 2-ethylhexyl, lauryl and octodecyl acrylates. The copolymer may also contain up to 20% of at least one other copolymerized compatible monoethylenically unsaturated monomer, for example an alkyl methacrylate, e.g. methyl-, ethyl-, and butyl-methacrylates, a vinyl ester, e.g. vinyl acetate, or vinyl toluene, acrylonitrile, or vinylidene chloride. The composition is used as a curable top coating for flexible fibrous substances, e.g. textile fabrics, paper and leather, which have previously been treated with a base coating consisting of the specified copolymer with 0-10% of cellulose acetate-propionate or cellulose acetate-butyrate. The coating compositions may also contain a catalyst for the curing step. Specified catalysts include butyl phosphoric acid, p-toluene sulphonic acid, oxalic acid, maleic acid, the mono-salt of maleic acid with triethylamine, or triethanolamine, and the chloride, hydroacetate, or maleate of diethanolamine or of 2-methyl-2 amino propanol-1. Preferably, the coating compositions are applied from solution in suitable organic solvents, e.g. methanol, ethanol, isopropanol, methyl acetate, ethyl acetate, acetone, methyl ethyl ketone, dioxane, the methyl, ethyl, or butyl mono-ethers of ethylene glycol, 2-ethoxy ethyl acetate, 2-ethoxyethyl propionate, 2-ethoxyethyl butyrate, and mixtures thereof. For details of the application of the coatings to flexible fibrous substances, see Division B2 abridgement.ALSO:Flexible fibrous materials, e.g. textile materials, leather and paper, are waterproofed by applying thereto one or more base coating compositions comprising a copolymer consisting of 1-10% of methacrylate units of the formula: <FORM:0964698/B1-B2/1> and 70-99% of acrylate units of the formula: <FORM:0964698/B1-B2/2> where R is an alkyl radical, the methacrylate and acrylate percentages being calculated on the weight of the copolymer, drying the coated article, applying one or more top coating compositions comprising a mixture of 25-50% of cellulose acetate propionate and/or cellulose acetate-butyrate and 50-75% of a copolymer as defined above, drying the article and curing the coatings thereon by heating the article to 220-450  DEG F. to render the coatings resistant to solvents.  A preferred copolymer comprises 1-10% glycidyl methacrylate and 90-99% of at least one C1-C18 alkyl acrylate, e.g. methyl-, ethyl-, n- and iso-propyl, n- and other butyl-, 2-ethylhexyl, lauryl and octadecyl acrylates.  The copolymer may also contain up to 20% of at least one other copolymerized compatible monoethylenically unsaturated monomer, for example an alkyl methacrylate, e.g. methyl-, ethyl- and butyl-methacrylates, a vinyl ester, e.g. vinyl acetate, or vinyl toluene, acrylonitrile or vinylidene chloride. The base coating composition may also contain up to 10% of cellulose acetate-propionate or cellulose acetate-butyrate and both base and top coating compositions may contain a catalyst for the curing step.  Specified catalysts include butyl phosphoric acid, p-toluene sulphonic acid, oxalic acid, maleic acid, the mono-salt of maleic acid with triethylamine, or triethanolamine, and the chloride, hydroacetate or maleate of diethanolamine or of 2-methyl-2-aminopropanol-1.  Preferably, the coating compositions are applied from solution in suitable organic solvents, e.g. mehanol, ethanol, isopropanol, methyl acetate, ethyl acetate, acetone, methyl ethyl ketone, dioxane, the methyl, ethyl or butyl mono-ethers of ethylene glycol, 2-ethoxy ethyl acetate, 2-ethoxy ethyl propionate, 2-ethoxy-ethyl butyrate, and mixtures thereof.