GB569525A - Improvements in and relating to synthetic resins - Google Patents

Abstract

Alkyd resins are modified with a b -furylacrylic acid or an esterifiable derivative thereof. They may be further modified with fatty oils, particularly drying and semi-drying oils such as linseed and soya oils. The products dry quickly, to very hard films. A preferred method is to heat a drying oil with a polyhydric alcohol in the presence of an alcoholysis catalyst to form a partial polyhydric alcohol ester, and then to esterify this partial ester with a polybasic acid and a b -furylacrylic acid. The preferred b -furylacrylic acid is b -(2-furyl) acrylic acid, but other specified acids are a -methyl-b -(2-furyl)acrylic, a -cyano-b -(2-furyl) acrylic, a : b - di - (2 - furyl)acrylic, a -phenyl-b -(2 - furyl)acrylic, a : b - dimethyl - b - (2 - furyl) acrylic, b -cyclohexyl - b - (2 - furyl)acrylic, b -(3-furyl)acrylic, b -[2 - (5-methylfuryl)]acrylic, and b -[2- (5 - chlorofuryl)]acrylic acids. According to examples: (1) soya oil, glycerol and litharge are heated together, and phthalic anhydride and xylene are then added, and heating contined. b -(2-Furyl)acrylic acid and further glycerol are added, and heating continued. The resin is thinned with mineral spirits and a cobalt drier is added. The solution dries quickly to a hard film; (2) linseed oil, glycerol and sodium hydroxide are heated together under a carbon dioxide blanket, and the product is mixed with more glycerol, phthalic anhydride, b -(2-furyl)acrylic acid and xylene, and heated further. On the addition of a drier, a fast- and hard-drying clear coating composition is obtained; (5) soya oil, linseed oil, glycerol, mineral spirits and an aqueous solution of sodium hydroxide are heated together. Phthalic anhydride, maleic anhydride and b -(2-furyl)acrylic acid are then added, and heating continued; (9) a resin prepared from coconut oil, glycerol, phthalic anhydride and b -(2-furyl)acrylic acid, is mixed with nitrocellulose, ethyl acetate, butanol, butyl acetate and toluene, to produce a lacquer drying to hard but flexible films. Other examples are given, in which dehydrated castor oil, coconut oil, pentaerythritol, and adipic acid are specified starting materials. Many alternative polyhydric alcohols and polycarboxylic acids are specified. Other modifying agents which can be used include chinawood, cottonseed, oiticica, perilla, sunflower seed and corn oils; butyric, stearic, acrylic, oleic, glycollic, lactic, chloroacetic, benzoic, salicylic and rosin acids; butyl, n-dodecyl, allyl, benzyl and cyclohexyl alcohols; and the various synthetic oils which are described in Specification 569,404. Coating compositions prepared from the resins of this invention may comprise driers, pigments such as barytes and titanium oxide, and solvents such as mineral spirits, toluene, butanol, butyl acetate, ethyl acetate and b -ethoxyethanol.