GB794585A - Process for the manufacture of raw materials for lacquers - Google Patents

Abstract

Mixed esters of polyhydric alcohols and polybasic acids and containing unsaturated fatty acid radicals are polymerized with unsaturated compounds containing at least one -CH=CHR group where R is hydrogen or a hydrocarbon residue, the product interesterified with polyhydric alcohols and reacted with isocyanates or diisocyanates. The mixed esters may be derived from polycarboxylic acids, e.g. succinic, glutaric, adipic, phthalic, maleic, tricarballylic and citric acids or their anhydrides, polyhydric alcohols, e.g. glycol, diethylene glycol, propanediols, butanediols, hexanediols, heptanediols, glycerol, trimethylol propane, trimethylol ethane, hexanetriol, pentaerythritol, sorbitol and mannitol, and unsaturated fatty acids or their glycerides, e.g. linseed, perilla, dehydrated castor, soya, groundnut, poppyseed, liver, pilchard, menhaden, fish, wood and oiticica oils. Specified unsaturated compounds are vinyl chloride, vinyl acetate, acrylic and methacrylic esters, styrene, a -methyl styrene, dichlorostyrene, divinyl benzene, indene, coumarone, butadiene, isoprene, cyclohexadiene, cyclopentadiene and dicyclopentadiene. The interesterification may be effected with the above-mentioned polyhydric alcohols or their interesterification products with the above-mentioned drying oils which may be used in the form of their stand oils or after treatment with air, oxygen, sulphur, sulphur dioxide, anthraquinone or maleic anhydride, optionally together with oil-modified alkyd resins containing free hydroxyl groups. Specified isocyanates are phenyl-isocyanate, dichloro-phenyl-isocyanate, cyclohexyl-isocyanate, chlorophenylene-2,4-diisocyanate, toluylene-diisocyanate and 1,6-hexamethylene diisocyanate. The interesterification may be effected by heating in an inert atmosphere, e.g. of nitrogen, and the reaction with isocyanates at 130-200 DEG C., optionally in the presence of a solvent, e.g. white spirit and turpentine oil. Driers, e.g. cobalt, lead and manganese naphthenates may be added and the products used in the production of lacquers. In Example 2 a linseed oil modified glycerol phthalate resin is copolymerized with dicyclopentadiene in turpentine oil. Specification 711,611 is referred to.