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Machine translation
1. (WO1979000071) SOLUTION POLYMERIZED HALOGENATED POLYESTERS
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1979/000071    International Application No.:    PCT/US1978/000048
Publication Date: 22.02.1979 International Filing Date: 25.07.1978
IPC:
C08G 63/682 (2006.01), C08G 63/81 (2006.01)
Applicants:
Inventors:
Priority Data:
819727 28.07.1977 US
Title (EN) SOLUTION POLYMERIZED HALOGENATED POLYESTERS
(FR) POLYESTERS AROMATIQUES HALOGENES POLYMERISES EN SOLUTION
Abstract: front page image
(EN)A process for preparing certain halogenated aromatic polyesters having a predetermined molecular weight is provided. Such polyesters are prepared by solution polymerization of an appropriate bisphenol and diacid halide wherein the diacid halide is added to a solution containing the bisphenol until the viscosity of the resulting polymer containing solution reaches a predetermined solution viscosity limit at which time the further addition of diacid halide is terminated. The solution limit is indicative of the attainment of said predetermined molecular weight. The identification of said solution viscosity limit is achieved by a feedback mechanism wherein the viscosity of the polymer containing solution is monitored or sensed during or after the addition of the diacid halide to the bisphenol containing solution.
(FR)Procede de preparation de certains polyesters aromatiques halogenes presentant un poids moleculaire predetermine. De tels polyesters sont prepares par polymerisation en solution de bisphenol approprie et d"un halogenure de diacide; l"halogenure de diacide est ajoute a une solution contenant le bisphenol jusqu"a ce que la viscosite de la solution resultante contenant le polymere atteigne une limite predeterminee de viscosite; a ce moment la, on termine l"addition ulterieure d"halogenure de diacide. Lorsque la solution presente cette limite le poids moleculaire predetermine est atteint. La detection de la limite de viscosite que presente la solution est assuree par un mecanisme a retroaction dans lequel la viscosite de la solution contenant le polymere est mesuree ou controlee, pendant l"addition, ou apres l"addition de l"alogenure de diacide a la solution contenant le bisphenol.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)