Process for the production of high molecular weight...

Details Process for the production of high molecular weight... Process for the production of high molecular weight...

C - Chemistry, Metallurgy

08

G

C08G 63/20 (2006.01) B29B 7/46 (2006.01) C08G 63/80 (2006.01) B29C 47/00 (2006.01)

Patent

CA 2096640

Preparation of high molecular weight polyester resins starting from resins with intrinsic viscosity I.V. lower than 0.57 dl/ comprising the following steps: (1) mixing the resin in the melt with a polyaddition additive containing at least two groups cap- able of addition reactions with the terminal OH and COOH groups of the resin; (2) converting the melted polyester into solid particles and then subjecting the particles to crystallization; (3) heating the particles at temperature between 150 and 210 °C up~ obtain the desired increase of intrinsic viscosity.

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