Copolyamide production method

Details Copolyamide production method Copolyamide production method

1995-04-05

1996-12-24

Mullis, Jeffrey C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528310, 528331, 528335, 528339, 528340, C08G 6928

Patent

active

055874479

ABSTRACT:
A method for producing a copolyamide, which comprises (1) heating either one dicarboxylic acid selected from the group consisting of adipic acid and a mixture containing 40 mol % or more of adipic acid to a temperature higher than the melting point of adipic acid but lower than a temperature lower by 30.degree. C. than the melting point of the resulting copolyamide, (2) dropping a diamine comprising paraxylylene diamine and metaxylylene diamine into the heated dicarboxylic acid before a conversion of the dicarboxylic acid reaches 90 mol %, (3) stopping dropping of the diamine before the conversion of the dicarboxylic acid reaches 90 mol %, and dropping metaxylylene diamine or a diamine mixture of metaxylylene diamine and paraxylylene diamine in place of the diamine until a molar ratio of the total of the diamines to the total of the dicarboxylic acids becomes 0.97 to 1.03, and (4) heating a reaction system to a temperature higher than a temperature lower by 30.degree. C. than the melting point of the finally formed copolyamide before the conversion of the dicarboxylic acid reaches 95 mol %, and elevating the temperature of the reaction system to a temperature higher than the melting point of the finally formed copolyamide upon termination of dropping the diamine.

REFERENCES:
patent: 4433136 (1984-02-01), Miyamoto et al.

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