Method for producing polyamides

Details Method for producing polyamides Method for producing polyamides

2003-04-08

2008-12-30

Zemel, Irina S (Department: 1796)

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

Synthetic resins

From carboxylic acid or derivative thereof

C528S170000, C528S312000, C528S319000, C528S320000, C528S322000, C528S323000, C528S324000

Reexamination Certificate

active

07470765

ABSTRACT:
A process for preparing a polyamide by reacting a mixture which comprises a monomer which has a nitrile group and has at least one other functional group capable of forming a carboxamide group, and comprises water, in the presence of titanium dioxide as catalyst, which comprises using titanium dioxide whose BET surface area, determined to the German standard DIN 66 131 volumetrically by the multipoint method, is in the range from 5 to 35 m2/g.

REFERENCES:
patent: 6288207 (2001-09-01), Mohrschladt et al.
patent: 6316588 (2001-11-01), Mohrschladt et al.
patent: 6815527 (2004-11-01), Bassler et al.
patent: 6878798 (2005-04-01), Ohlbach et al.
patent: 1-201023 (1989-08-01), None
patent: 01/09224 (2001-02-01), None
BASF 51573, Continous preparation of polyamides from aminonitriles 1-29 date unknown.

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