GB583754A - New and improved synthetic resins - Google Patents

Abstract

A synthetic resin is prepared by heating an alkyd resin, which may be oil-modified or not, with the hydrolysis product of a compound of the formula RnSiX4-n, where R represents any substituted or unsubstituted hydrocarbon radical such as alkyl, e.g. methyl, ethyl, propyl, n- or i-butyl; cycloalkyl, e.g. cyclohexyl; aryl, e.g. phenyl, para-chlorphenyl and para-tolyl; or aralkyl, e.g. benzyl; X is a halogen, e.g. chlorine, bromine or iodine, or OR1- (where R1 is a hydrocarbon radical), e.g. methoxy, ethoxy, or phenoxy; and n is a whole number less than 3. Specified compounds of the above formula are methylsilicon trichloride, dimethylsilicon dichloride, diphenylsilicon dibromide, phenylethylsilicon dichloride, phenylsilicon trichloride, dibenzyl silicon dichloride, phenyltriethoxy silicane, diphenyldiethoxy silicane, cyclohexylsilicon trichloride and para-tolylsilicon trichloride. The alkyd resins may be glyceryl phthalates modified or not with linseed oil, castor oil or hydrogenated castor oil. The reaction is preferably carried out in a solvent, e.g. benzene, toluene, xylene or n-butanol. The product, dissolved in a solvent, e.g. butanol, with or without the incorporation of pigments, e.g. titanium dioxide, may be used as a coating composition. In examples: (1) castor-oil-modified glyceryl phthalate resin is reacted in xylene solution with the hydrolysis product of phenylsilicon trichloride and the product is dissolved in butanol; with the addition of titanium dioxide and xylene, an enamel is formed; (3) hydrogenated-castor-oil-modified glyceryl phthalate resin is reacted in xylene solution with the hydrolysis product of phenylsilicon trichloride; the product dissolved in butanol and titanium dioxide added to form a coating composition; (4) linseed-oil-modified glyceryl phthalate resin is reacted with the hydrolysis product of phenylsilicon trichloride in xylene solution, the product dissolved in butanol and xylene and pigmented with titanium dioxide forming a coating composition to which cobalt naphthenate may be added; (5) butanol-modified glyceryl adipate resin is reacted with the hydrolysis product of phenylsilicon trichloride in xylene solution, the product dissolved in butanol and xylene, and pigmented with titanium dioxide to form a coating composition; (6) castor-oil-modified glyceryl phthalate resin is reacted with the hydrolysis product of benzylsilicon trichloride in xylene solution and the product dissolved in butanol; (7) castor-oil-modified glycerylphthalate resin is reacted with the hydrolysis product of cyclohexyl silicon trichloride in xylene solution and the product is dissolved in butanol; (8) castor-oil-modified glycerylphthalate resin is reacted with xylene solution with the hydrolysis product of the reaction production of methyl magnesium chloride with silicon tetrachloride and butanol is added periodically when the mixture gels and the product is finally dissolved in butanol. The compounds formulated above may be obtained by treatment of the appropriate tetrahalogenosilicane or silicic acid ortho-ester with Grignard reagents, and may be hydrolysed by treatment with water, aqueous alkali or aqueous acid. In an example, phenylsilicon trichloride dissolved in ether is added slowly to ice-water with cooling. The ether layer, together with an ether extract of the aqueous layer, is washed with water, dried, and mixed with xylene and the ether evaporated. Specifications 542,655, 548,911, 548,912, 551,649 and 552,640 are referred to.