GB1137209A - Polyesteramides - Google Patents

Abstract

1,137,209. Polyesteramides. EASTMAN KODAK CO. 1 April, 1966 [5 April, 1965], No. 14494/66. Heading C3R. Linear polyesteramides are prepared by heating at 200-350‹ C., in an inert atmosphere or vacuum a compound or compounds contains ing carboxylic acid, amino and hydroxyl groupas the sole reactive groups in the presence of 0À005 to 2% by wt. of the reaction mixture of an organo-tin compound. The carboxylic acid groups are present in the form of dicarboxylic acids, amino acids or hydroxy acids. The amino groups which are directly attached to an aromatic nucleus are present as diamines, amino alcohols or amino acids. The hydroxyl groups are present as diols, amino alcohols or hydroxy acids; the reactive OH group is separated from the other functional groups by at least two carbon atoms and is attached to an organic radical in which the carbon atom attached to OH is attached to adjacent atoms, at least one of which is hydrogen, by single valence bonds. A variety of combinations of the above compounds are described and claimed. When a dicarboxylic acid is used it may be an aliphatic acid having at least 4 carbon atoms between the carboxyl groups or an aromatic or alicyclic dicarboxylic acid having at least 3 carbon atoms between the carboxyl groups. A mixture of an alicyclic acid with either an aromatic or aliphatic acid may be used. A diamine may be used in which the amino groups are separated by at least 3 carbon atoms. Amino acids are suitable in which the carboxyl group is attached to an aromatic ring or is separated therefrom by an alkylene, cycloalkylene or alkyleneoxy group. Hydroxy acids of similar structure may also be employed. Amino alcohols may be used in which the amino group is attached to an aromatic ring and the OH group is separated therefrom by an alkylene, cycloalkyl. ene or alkyleneoxy group. In preferred embodiments the reactants are heated at 200- 300‹ C. for 30-90 minutes to give a prepolymer. The latter is further polymerized either by stirring the melt in vacuum for ¢-3 hours at 200-350‹ C. or by granulating the prepolymer to a particle size of 0À03 inch or smaller followed by heating in vacuum or inert atmosphere below its M.P. for at least one hour. Suitable organotin compounds are di- or tetra-valent, the valencies being satisfied by alkyl or aryl groups or electronegative radicals.