Process for separating higher molecular weight constituents from

Details Process for separating higher molecular weight constituents from Process for separating higher molecular weight constituents from

1987-03-16

1989-01-03

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568724, 568749, 568753, C07C 3768

Patent

active

047958294

ABSTRACT:
A process for separating higher molecular weight constituents from phenol polymers, wherein the phenol polymer is dissolved in an organic solvent medium, the solution obtained is mixed at room temperature with ammonia or an amine such that there is a stoichiometric deficiency of ammonia or amine, the precipitate is separate, dried, if appropriate, and treated with aqueous acid, and the resulting sediment is filtered off, washed and dried as described. The starting phenol polymer preferably is a condensation product of optionally substituted phenol and formaldehyde. The process yields fractions possessing an increased osmometric molecular weight, a narrower molecular weight distribution range and an increased glass transition temperature.

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patent: 4348471 (1982-09-01), Shelnut et al.
patent: 4507509 (1986-03-01), Mandiratta et al.
patent: 4626605 (1986-12-01), Wojtech et al.
8"Handbook of Chemistry and Physics", pp. D-127-D-149; (1977).
Chemical Abstracts, vol. 68, No. 16, 78918d, Apr. 15, 1968.
Chemical Abstracts, vol. 98, No. 26, 98:225293w, Jun. 27, 1983.

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