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US 4,638,038 AGranted
Carboxylic acid-grafted phenoxy resins
AssigneeUnion Carbide Corporation
InventorGeorge A. Salensky
Life of this patent
Estimating the term…
Abstract
Phenoxy resins are acid-grafted by reaction of secondary hydroxyls with monoanhydrides of di- or polycarboxylic acids. The grafted resins have improved adhesion to smooth surfaces, can be readily emulsified, and are also useful in coatings for magnetic recording media.
Claims15
A phenoxy resin having pendant secondary hydroxyl groups of which about 3 to about 50% of such hydroxyl groups have been reacted to produce moieties having pendant carboxyl groups.
A method of producing a phenoxy resin having pendant carboxyl groups grafted thereon, comprising:
- (a) preparing a solution of the phenoxy resin, a monoanhydride, and a catalytically active amount of an amine catalyst, in a nonreactive solvent, and
- (b) maintaining the solution at such temperature that reaction proceeds to form a grafted phenoxy resin in which about 3 to about 50% of the hydroxyl groups of the phenoxy resin have been reacted with the anhydride to produce moieties having pendant carboxyl groups.
Dependencies are inferred from the claim text.