Paper making and fiber liberation – Processes and products – Synthetic fiber
Patent
1990-05-17
1991-06-04
Chin, Peter
Paper making and fiber liberation
Processes and products
Synthetic fiber
162146, D21H 1326
Patent
active
050211234
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 medium, filtering, washing, pressing and drying the mixture.
REFERENCES:
patent: 2999788 (1961-09-01), Morgan
patent: 3063966 (1962-11-01), Kwolek et al.
patent: 3869429 (1975-03-01), Blades
patent: 4011203 (1977-03-01), Konomi et al.
patent: 4072664 (1978-02-01), Konomi et al.
patent: 4511623 (1985-04-01), Yoon et al.
patent: 4579895 (1986-04-01), Cuidard et al.
patent: 4698267 (1987-10-01), Tokarsky
U.S. Ser. No. 07/213,741, filed Jun. 30, 1988.
Japanese Patent Application 52-124099, published Oct. 18, 1977.
Chin Peter
E. I. Du Pont de Nemours and Company
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