Patent GB-483066-A (GB)
Title: Improvements in synthetic resins and compositions containing such resins
IPC: C08G8/02
Filed: 1936-07-03
Abstract: In preparing resins by condensing a dihydroxy phenol with a ketone using an acid condensing agent, the proportion of ketone employed is at least equal to that of the phenol, the temperature and the amount of catalyst employed are relatively low, and the product initially formed is substantially freed from any unreacted phenol.  Specified phenols are resorcinol, catechol, hydroquinone and orcinol, and specified ketones methyl ethyl ketone, diethyl ketone, cyclohexanone, methyl cyclohexanone, acetophenone, benzophenone and phenyl acetone. The condensation may be effected in the presence of zinc chloride, ferric chloride, sodium bisulphate, or hydrochloric, sulphuric or phosphoric acids.  The resins may be employed in association with natural or synthetic resins, or with cellulose derivatives, e.g. cellulose acetate, nitrate or ethers; they may be incorporated in fabrics, filaments or films made of or containing cellulose acetate, in lacquers, insulating compositions, and moulding powders. Compositions containing the resins may also contain solvents, e.g. acetone, ethyl alcohol, benzene, ethylene dichloride, ethyl acetate, ethyl lactate, tetrachlorethane, benzyl alcohol and diacetone alcohol; plasticizers, e.g. diphenylolpropane, triacetin, dibutyltartrate, diethyl phthalate, and monoethyl sulphonamide; fire retardants, e.g. brominated tricresyl phosphate; and pigments or dyes.  In examples: (1) resorcinol is condensed in the presence of hydrochloric acid with methyl ethyl ketone, cyclohexanone or methyl butyl ketone, the product being dissolved in ethyl alcohol and reprecipitated by pouring into water; (4) an insulating film is prepared from a solution of cellulose acetate and ketone-resorcinol resin in acetone; (5) an insulating varnish comprises cellulose acetate, methyl ethyl ketone-resorcinol resin or cyclohexanone-resorcinol resin, acetone, ethyl alcohol and benzene; (6) a lacquer is prepared by adding ethyl lactate with or without pigment to the varnish of example (5); (7) a moulding powder is prepared by grinding cellulose acetate with methyl ethyl ketone- or cyclohexanone-resorcinol resin; (8) coating compositions comprise cellulose acetate, synthetic resin and acetone with or without alcohol and diacetone alcohol; (10) an adhesive comprises cellulose acetate, synthetic resin, acetone, ethyl acetate, and ethyl lactate; (11) a plastic composition consists of cellulose acetate, synthetic resin, monomethyl xylene sulphonamide, alcohol, and benzene; (12) a solution of cellulose acetate and synthetic resin in acetone is used for making artificial yarn; (13) a pigmented lacquer comprises cellulose acetate, synthetic resin, diphenylolpropane, pigment, acetone, ethyl acetate, benzene, toluene, and ethyl lactate; (14) coating compositions or adhesives comprise cellulose nitrate, camphor, a phthalate, synthetic resin, benzene, alcohols, butyl acetate and ethyl acetate.  In these examples, the cellulose acetate may be replaced by cellulose propionate or butyrate, and either the cellulose acetate or nitrate may be replaced by cellulose ethers. Specification 368,801 is referred to.