✦ LIBER ✦

New catalysts for urea formation reactions. II. Catalytic activity of carboxylic acids

✍ Scribed by Yoji Watabe; Michio Ishii; Yutaka Iseda

Publisher: John Wiley and Sons
Year: 1980
Tongue: English
Weight: 366 KB
Volume: 25
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1980.070251208

No coin nor oath required. For personal study only.

✦ Synopsis

Synopsis

Carboxylic acids with weak acidities showed large catalytic activity. For instance, for chlorinesubstituted acetic acid the activity increased with decreasing chlorine content. For benzoic acid derivatives, electron acceptor substituents, such as NOa, C1, and OH, lowered the catalytic activity, while electron donor substituents such as alkyl and alkoxy groups increased it. Detailed study on the cure rate of polyureaurethane, with 2-methyl benzoic acid as a catalyst, showed that pot life (PL) and the minimum demolding time (DT) had a correlation with the catalyst amount [X] represented by the following equation:

where A and R are constants. Further, use of appropriate amounts of the catalyst enhanced tensile strength at break for polyureaurethane.

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