Improvements in and relating to process for preparing liquid resins capable of being rendered soluble in water in the form of a gel of thixotropic character, products resulting therefrom and the applications of said products

摘要

Liquid resins capable of being rendered soluble in water in the form of a gel of thixotropic character are prepared by heating to a temperature in excess of 220 DEG C. a mixture of at least one drying or semi-drying oil and at least one neutral allyl ester and then after cooling the product obtained, heating it in a second stage to a temperature above 150 DEG C. with an unsaturated aliphatic diacid, an anhydride of said diacid, an acid ester of said diacid and of an alcohol having at the most three carbon atoms in its alcohol chain, or mixtures thereof, the heating being prolonged at least until the liquid resin obtained is soluble in an ammoniacal aqueous solution, and collecting the liquid resin thus obtained. In the second stage acid esters of unsaturated aliphatic diacids and of alcohols having more than three carbon atoms in their alcohol chain, and the neutral esters of said diacids and alcohols whose alcohol chain can be of any length, or components producing them, may additionally be present. The neutral allyl esters can be those of mono- or polycarboxylic, aliphatic or aromatic, saturated or unsaturated acids, and the alcohol component may be allyl or methallyl alcohol. The drying and semi-drying oils which includes the esters of drying and semi-drying fatty acids and polyols, may be used as such or in the form of stand oils, styrenated oils or oxidized oils. The unsaturated aliphatic diacids used in the second stage and mentioned are maleic, fumaric, citraconic and mesaconic acids. The liquid resins may be used in paint compositions. Reference has been directed by the Comptroller to Specification 916,090.