Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1989-04-03
1990-09-25
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
1621573, 264232, 524104, 524606, 524718, 528348, C08G 6928
Patent
active
049594532
ABSTRACT:
A process for producing a fibrous gel composition of poly(paraphenylene terephthalamide) comprising the steps of placing terephthaloyl chloride in reactive contact with paraphenylene diamine in a solution of at least one amide-type polar solvent (e.g. N-methylpyrrolidone), an alkaline earth metal salt and the aliphatic tertiary amine, N-methylpyrrolidine or its hydrochloride. Poly(paraphenylene terephthalamide) papers are prepared by diluting the composition in an amide diluent, blending in a slurry of poly(paraphenylene terephthalamide) fibers in a precipitating mediu, filtering, washing, pressing and drying the mixture.
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patent: 4011203 (1977-03-01), Konomi et al.
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U.S. Ser. No. 7,213,741, filed June 30, 1988.
Japanese Patent Application No. 52-124099, published Oct. 18, 1977.
Anderson Harold D.
E. I. Du Pont de Nemours and Company
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