Methylene-crosslinked polyarylamine and process for preparing same
First Claim
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1. A process for preparing a methylene-crosslinked polyarylamine by reacting aniline with formalin in the presence of hydrochloric acid under the following conditions (a), (b), (c) and (d):
- (a) the amount of hydrochloric acid is in the range of from 0.1 to 0.5 mole per mole of aniline;
(b) the amount of aniline is in the range of from 1.5 to 4.0 moles per mole of formalin;
(c) the reaction is divided in at least four stages, andthe reaction in the first stage is carried out at 20 to 50°
C. in a water/aniline ratio in the range of from 1.3 to 2.5 moles,the reaction in the second stage is done at 40 to 70°
C. in a water/aniline ratio in the range of from 1.9 to 5.0 moles,the reaction in the third stage is done at 50 to 90°
C. in a water/aniline ratio in the range of from 2.4 to 5.7 moles, andthe reaction in the last stage is done at a temperature of 110°
C. or more; and
(d) formalin is divided into 3 or more stages and used in the reactions in the respective stages.
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Abstract
A methylene-crosslinked polyarylamine is disclosed which contains a less amount of N-methylmethylenedianiline. A process for continuously preparing this kind of methylene-crosslinked polyarylamine is also revealed which comprises reacting aniline with formalin in the presence of hydrochloric acid under specific reaction conditions.
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Citations
2 Claims
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1. A process for preparing a methylene-crosslinked polyarylamine by reacting aniline with formalin in the presence of hydrochloric acid under the following conditions (a), (b), (c) and (d):
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(a) the amount of hydrochloric acid is in the range of from 0.1 to 0.5 mole per mole of aniline; (b) the amount of aniline is in the range of from 1.5 to 4.0 moles per mole of formalin; (c) the reaction is divided in at least four stages, and the reaction in the first stage is carried out at 20 to 50°
C. in a water/aniline ratio in the range of from 1.3 to 2.5 moles,the reaction in the second stage is done at 40 to 70°
C. in a water/aniline ratio in the range of from 1.9 to 5.0 moles,the reaction in the third stage is done at 50 to 90°
C. in a water/aniline ratio in the range of from 2.4 to 5.7 moles, andthe reaction in the last stage is done at a temperature of 110°
C. or more; and(d) formalin is divided into 3 or more stages and used in the reactions in the respective stages. - View Dependent Claims (2)
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Specification