Injection moldable amide-imide copolymers
AssigneeStandard Oil Company (Indiana)
InventorsRobert G. Keske, James R. Stephens
Life of this patent
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Abstract
Injection moldable copolymers are prepared from fully or partially acylated aromatic diamines and aromatic tricarboxylic anhydride compounds or mixtures of tricarboxylic anhydrides and dicarboxylic acids. These copolymers are useful for the preparation of injection molded articles and fibers.
Claims19
A process for the preparation of random linear injection moldable amideimide and amide copolymers having an inherent viscosity of about 0.6 to 3.0 which process comprises reacting fully or partially acylated aromatic diamines, wherein at least half of the diamines utilized in the reaction are acylated in the presence of C.sub.2 through C.sub.8 containing aliphatic anhydrides or acids, with aromatic tricarboxylic acid anhydrides, or mixtures of aromatic dicarboxylic acids and aromatic tricarboxylic acid anhydrides in a molar ratio of about 9:1 to about 1:9 at a temperature of about 450.degree. to 750.degree. F., and wherein the molar ratio of the diamines to the anhydride or acid and anhydride mixture is about 0.9:1 to 1.1:1.
A continuous process for the preparation of random linear injection moldable amide-imide and amide copolymers having an inherent viscosity of about 0.6 to 3.0 which continuous process comprises reacting fully or partially acylated aromatic diamines, wherein at least half of the diamines utilized in the reaction are acylated in the presence of C.sub.2 through C.sub.8 containing aliphatic anhydrides or acids, with aromatic tricarboxylic acid anhydrides, or mixtures of aromatic dicarboxylic acids and aromatic tricarboxylic acid anhydrides in a molar ratio of about 9:1 to 1:9 at a temperature of about 450.degree. to 750.degree. F., and wherein the molar ratio of the diamines to the anhydride or acid and anhydride mixture is 0.9:1 to 1.1:1.
Dependencies are inferred from the claim text.