GB529399A - Improvements in or relating to coating film forming and sealing compositions obtained from polymeric derivatives of methacrylic acid - Google Patents

Abstract

529,399. Synthetic resin compositions. DU PONT DE NEMOURS & CO., E. I. May 17, 1939, No. 14767. Convention date, May 20, 1938. [Class 2 (iii)] Coating, film forming, sealing compositions &c. are obtained by blending together a wax and a polymeric methacrylic acid amide, imide or ester, the wax and the polymer being heated together above the melting point of the wax, and the polymer when it is an ester, being such that the alkyl radical thereof contains more than two carbonatoms. Waxes include those of animal; vegetable, or mineral origin such as carnauba candellila, montan, lanoline, cocabutter, cotton seed, stearin, Japan wax, bayberry, myrtle, mace, palm kernel, beeswax, spermaceti, Chinese insect, mutton tallow, hydrogenated coconut oils, soy bean, paraffin, ceresin, montan, ozokerite. Of the esters of methacrylic acid n-propyl and higher esters are suitable e.g. butyl, cyclohexyl, amino alcohol esters, esters of mixtures of alcohols obtained by the catalytic hydrogenation of carbon oxides at elevated pressure, methacrylic acid esters of alcohols derived by carboxyl hydrogenation of vegetable oils eg. lauryl, myristyl, cetyl and stearyl alcohols. Polymeric amides and imides specified comprise the laurylimide, octylimide, monobutyl amide, dibutyl amide and the mono- and di-higher-alkylamides. Interpolymers or polymeric mixtures may also be used provided the average of the number of carbon atoms in the alkyl groups is greater than 2. Additional components specified comprise natural or synthetic rubbers or their halogen compounds, gutta percha, asphalt, natural and synthetic resins and plasticizers e.g. dicyclohexyl phthalate, phthalates of higher alcohols, cresyl phosphates para toluene sulphonamide, dibutyl phthalates, octadecanediol monocarbamate, stearyl carbamate. The temperatures specified are from 75‹C. upwards but preferably temperatures above the " solution temperature " of the ester, i.e. the temperature at which the paraffinpolymer solution becomes cloudy on cooling. This decreases with increasing molecular weight of the esterified alcohol radical e.g. the solution " temperature for a 40 per cent. polymer solution of propyl methacrylate in paraffin wax is 240‹C. and 170‹C. for butyl methacrylate. 40 parts of n-butyl methacrylate monomer (containing 0.5 per cent. benzoyl peroxide) is mixed with 60 parts of melted paraffin wax (m.p. 57-60‹C. ) and the mixture placed in an oven heated to 100‹C. After three days the layers of polymer and paraffin are heated to 180‹C. and complete solution is obtained. A table of blends of paraffin wax, polymer and additional ingredients is given. The products obtained may be used (1) as coating compositions for cloth, paper, leather, cellulose films, linoleum oil cloth, wall board, stone, cement, bricks &c. wood, glass, metals, wire screens (2) in the form of films and filaments which may be used for wrapping foodstuffs &c. Alternatively the food stuffs may be dipped in the molten products (3) for spraying wood, metal, cans for preserving food &c. and for electric insulation purposes (4) as adhesives or polishes (5) for sizing paper.