GB552644A - Improvements in or relating to resinous ester products - Google Patents

Abstract

552,644. Coating compositions derived from resinous ester products. BAKELITE, Ltd. Aug. 1, 1941, No. 9825. [Class 2 (iii)] Resinous ester products suitable for use alone or with additions as coating compositions, in particular as varnishes, enamels and for coating wires, are prepared by re-acting together a cyclopentadiene adduct of maleic acid or anhydride with a polyhydric alcohol and a monobasic fatty acid derived from a drying or semi-drying oil. Specified alcohols are glycol, glycerol, sorbitol, mannitol and pentaerythritol. Specified monobasic fatty acids are the acids containing oleic, linoleic or linolenic acids derived from drying or semidrying oils ; they may be replaced wholly or partly by their monoglycerides or triglycerides which latter have been oxidized to an iodine value of 105 to 135, the proportion of glycerol being correspondingly reduced. It is preferred that the monobasic acid calculated as triglyceride makes 50 per cent. of the re-action mass. The acid may be wholly or partly replaced by dehydrated castor oil. The cyclopentadiene adducts are referred to in " The Chemistry of Synthetic Resins " (Ellis, 1935 ed.) chap. 40 ; the adduct may be partially replaced by an oil-soluble phenolic resin such as that prepared from an alkyl or aryl substituted phenol or an hydroxy phenol. The resinous ester products may be modified by the addition of alkyd or urea-formaldehyde resins, casein, and plasticisers such as tricresyl phosphate, dibutyl phthalate or the non-drying monobasic fatty acid derived from peanut or cottonseed oils. The resinous ester products are suitable for coating metals, e.g. wires, and for impregnating paper, felt, and cloth and may be used alone, in aqueous emulsion or diluted with thinners. As emulsifying agent triethanolamine is specified, and thinners mentioned include volatile solvents, hydrocarbon thinners and coal tar solvents. The products may be modified by heating with a drying or semidrying oil, e.g. linseed, oiticica, tung or perilla oils which has preferably been pre-heated and are compatible with cellulose esters, e.g. nitrate or ethyl ester. Printing inks may be obtained by modifying the ester products with oil with the addition of pigments such as carbon black or Prussian blue. In examples, a resinous ester product was obtained by heating the maleic anhydride-cyclopentadiene adduct with glycerol and (1) linseed monobasic fatty acids, (2) blown linseed or soya bean oil or (4) linseed and soya bean fatty acids. In (5) the cyclopentadiene maleic anhydride adduct was heated with pentaerythritol and soya bean fatty acids and diluted with xylol with the addition of driers, an enamel being obtained from the varnish by adding titanium oxide, zinc oxide and petroleum thinner, and a lacquer by addition of nitrocellulose and xylol. (6) An oilsoluble resin obtained from p-hydroxy benzoic acid and formaldehyde in the presence of oxalic acid was heated with abietic acid, glycerol, the adduct and linseed and soya bean fatty acids (part of the glycerol could be replaced by polyvinyl alcohol). In (7) linseed oil monoglyceride was obtained by heating linseed oil and glycerol in the presence of litharge; the product was heated with glycerol, and the adduct to form a varnish. A varnish was obtained by diluting the resinous product of (4) with (8) xylol and driers and (9) an enamel by using the product of (4) but made from linseed fatty acids only mixed with coal tar solvent, tung oil and a resin made from p-phenyl phenol and formaldehyde. A wire enamel was made by heating the cyclopentadiene adduct of maleic acid with china wood oil fatty acids and pentaerythritol and adding thinner. Resinous ester products were heated with (11) linseed oil, to give (12) a binder suitable for brake linings ; (13) ester gum and perilla oil or Cumar or Congo resin or rosin ; these modified products could be further diluted to obtain varnishes. Specification 468,542 is referred to.