GB921623A - Modified alkyd resin compositions and process of preparing the same - Google Patents

Abstract

A film-forming alkyd ester composition comprises (1) a monobasic acid-modified alkyd ester which is the reaction product of a monocarboxylic acid, a polyol and a dicarboxylic acid or anhydride, this reaction product having an acid value of 45-90 before being further reacted with a dicarboxylic acid anhydride to form a partial ester of acid number 80-120, (2) an epoxidized unsaturated fatty acid ester containing 6-26 carbon atoms in the fatty acid chains and (3) a volatile neutralizing agent in a proportion sufficient to inhibit reaction between free carboxylic acid groups of the modified alkyd and the epoxy groups of the epoxidized ester. Specified are monocarboxylic acids numerous unsaturated and saturated fatty acids derived from fatty oils of vegetable, animal and marine origin (the oils themselves may be used reacting by alcoholysis) and benzoic, p-tert. butyl benzoic, 2-ethyl hexoic and pelargonic acids polyols pentaerythritol, trimethylolethane, trimethylolpropane, sorbitol, diethylene glycol, propylene glycol, ethylene glycol, glycerol, 1,2,6-hexanetriol, copolymers of styrene and allyl alcohol and glycol etherified phenols dicarboxylic acids and anhydrides phthalic, tetrahydrophthalic, hexahydrophthalic, tetrachlorophthalic, maleic, chlorendic and succinic anhydrides and isophthalic, terephthalic, adipic and fumaric acids for the initial condensation with tetrachlorophthalic, monochlorophthalic, chlorendic, phthalic, tetrahydrophthalic and hexahydrophthalic anhydrides for the subsequent reaction volatile neutralizing agents triethylamine, dimethyl formamide, diethanolamine, ammonia, dimethylethanolamine, mono-ethanolamine, dipropylamine and diisopropylamine and epoxidized unsaturated fatty acid esters epoxidized unsaturated glyceride oils and synthetic esters and dimer and trimer polymers derived therefrom of which there are particularly mentioned epoxidized linseed, segregated soybean, safflower and fish oils, epoxy-stearyl acetate, epoxy-stearyl epoxy-stearate, butyl epoxy-stearate, octyl epoxy-behenate, methyl di-eposy-stearate, di-(epoxy-lauryl) adipate, propyl tri-epoxy-stearate and allyl epoxy-stearate. A solvent, e.g. xylene or toluene, is incorporated into the composition during its preparation and usually a small proportion of a secondary solvent, e.g. butanol, mono- or di-butyl ether of ethylene or diethylene glycol or mono- or di-ethyl ether of ethylene or diethylene glycol, is also incorporated. The composition may be dispersed in water by use of excess of the neutralizer. A compatible resinous material, e.g. a phenol-formaldehyde or melamine-formaldehyde condensation product, an acrylic emulsion or a natural or synthetic rubber latex such as a butadiene-styrene copolymer, may also be included. The composition may also be pigmented, e.g. with titanium dioxide. Specification 921,622 is referred to.