Method for the fractionation of reactive terminated polymerizabl

Details Method for the fractionation of reactive terminated polymerizabl Method for the fractionation of reactive terminated polymerizabl

1985-07-26

1986-11-11

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528353, C08G 6926, C08G 6934

Patent

active

046223835

ABSTRACT:
Acetylene or vinyl-terminated polymerizable oligomers of polyamic acid are fractionated to obtain an oligomer product having a molecular weight in the range of 2,000 to 4,000 which exhibits improved wetting and film forming properties. Fractionization is accomplished by dissolving the unfractionated polymerizable oligomer in a solvent in which the desired molecular weight fraction is soluble. The oligomer solution is passed through a filter which removes undissolved material having a molecular weight in excess of the desired molecular weight range. The filtrate is admixed with a hydrocarbon to precipitate the desired molecular weight fraction. Thereafter the collected solids can be redissolved in a ketonic solvent and the fractionation procedure repeated to further improve the molecular weight content of the fractionated oligomer.

REFERENCES:
patent: 3845018 (1974-10-01), Bilow et al.
patent: 4097456 (1978-06-01), Barie
patent: 4168366 (1979-09-01), D'Alelio
patent: 4206106 (1980-06-01), Heilman et al.
patent: 4218555 (1980-08-01), Antonoplos et al.
patent: 4276407 (1981-06-01), Bilow et al.
patent: 4307220 (1981-12-01), Lucarelli et al.
patent: 4480088 (1984-10-01), Pike

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