Production method of polyamide

Details Production method of polyamide Production method of polyamide

2006-05-30

2006-05-30

Hightower, P. Hampton (Department: 1711)

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

Synthetic resins

From carboxylic acid or derivative thereof

C528S322000, C528S332000, C528S335000, C528S336000, C528S340000

Reexamination Certificate

active

07053171

ABSTRACT:
In the production method of the present invention, the polyamide is produced by the polycondensation of a diamine component and a dicarboxylic acid component comprising a straight-chain α,ω-aliphatic dicarboxylic acid and an aromatic dicarboxylic acid. The dicarboxylic acid component is first made into a suspension phase of the solid aromatic dicarboxylic acid in a molten straight-chain α,ω-aliphatic dicarboxylic acid. A part of the diamine component is added while the reaction system is in the suspension phase. Then, the reaction system is made into a homogeneous molten phase, to which the rest of the diamine component is added. Finally, the reaction system is kept at temperatures within a specific range to complete the polycondensation.

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Communication and European Search Report dated Jun. 29, 2004, for No. EP 04 01 1336.

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