GB435762A - Synthetic resins and their applications - Google Patents

Abstract

Resinous materials soluble in varnish oils are prepared by reacting in an alkaline medium formaldehyde or a derivative thereof such as methylene chloride, methylal, hexamethylene-tetramine and paraformaldehyde with a binuclear phenol containing at least one but not more than two reactive positions and containing at least four non-aromatic carbon atoms one of which is a secondary or tertiary carbon atom which is directly joined to a benzene ring in one of the o- or p-positions in relation to a phenolic hydroxy group. Suitable phenols include di(4 - hydroxy - 3 - methylphenyl) - dimethylmethane or the corresponding methylethyl-, dipropyl- and ethyl-methane derivatives, di(2 - hydroxy - 5 - methylphenyl) - dimethylmethane or the corresponding methylethyl- or methyl-methane derivative and di(2 - hydroxy - 3 - methylphenyl)propylmethane. In examples: (1) di(4 - hydroxy - 3 - methylphenyl)dimethylmethane is condensed with formaldehyde in the presence of sodium hydroxide and the resinous product, which is soluble in acetone, alcohol and ethoxyethanol, is blended with raw chinawood oil or linseed oil or mixtures thereof and thinned with a mineral thinner and an aromatic hydrocarbon with or without a cobalt drier to yield a varnish; (5) the resin prepared in example 1 is blended with a polyhydric alcohol polybasic acid condensation product containing a drying oil or a fatty acid derived therefrom and thinned with or without the addition of an oil to yield a varnish--suitable polyhydric alcohols include glycerol, ethylene glycol, diethylene glycol, pentaerythritol and monoethylin, suitable polycarboxylic acids include phthalic anhydride, adipic, sebacic, dilactylic, maleic, diphenic, tetrahydrophthalic and quinolinic acids and suitable modifying agents which may be used in addition to the drying oils or drying oil acids include natural resins such as rosin, kauri, congo and ester gums, monocarboxylic acids such as butyric, oleic, stearic, salicylic, benzoic acids and semi- and non-drying oil acids and monohydric alcohols such as amyl, ethoxyethyl, lauryl, benzyl and cyclohexyl alcohols. The products may be blended with cellulose derivatives such as nitrocellulose, cellulose acetate, benzyl cellulose and ethyl cellulose; natural resins and ester gums such as rosin, kauri, copal and rosin glyceride; synthetic resins or synthetic resin forming material such as metastyrene, coumarone-indene resins, amine-aldehyde resins, acrylic ester resins, vinyl resins, casein plastics, polyhydric alcohol-polybasic acid resins unmodified by drying oils or drying oil acids; bitumens such as asphalts; natural or synthetic waxes such as beeswax, candelilla wax, montan wax, carnauba wax and lauryl stearate; other ester-like bodies such as stearin, castor oil, hydrogenated castor oil, tricresyl phosphate, dibutyl phthalate, triethylin, animal fats and waxes; pigments; solvents; plasticizers, antioxidants, fillers and lakes for use in the manufacture of coating compositions, moulding plastics, impregnating agents for paper, wood, cloth, stone, or rubberized fabrics, adhesives for safety glass, linoleum, adhesives, cements, sealing waxes, insulating materials together with mica or asbestos and laminated sheet or tubes from cellulose derivatives such as cellulose acetate. Specification 199,528, [Class 2 (iii)], is referred to. Di(4 - hydroxy - 3 - methylphenyl)dimethylmethane is prepared by condensing acetone with o-cresol in the presence of dry hydrochloric acid gas. The Specification as open to inspection under Sect. 91 refers also to the subject-matter of Specifications 435,796 and 435,797. This subject-matter does not appear in the Specification as accepted.