Process for producing polyester resin composition

Details Process for producing polyester resin composition Process for producing polyester resin composition

1988-04-21

1989-10-31

Jacobs, Lewis T.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523216, 523351, 524497, 524605, C08K 902, C08K 322

Patent

active

048778192

ABSTRACT:
A process for producing a titanium dioxide containing polyester resin composition from which a white film useful as a reflective photographic support can be prepared is disclosed.
Said process is performed by first supplying a polyester resin and titanium dioxide into a continuous kneading extruder, kneading them in molten state, and supplying an additional charge of the polyester resin to give a desired concentration of the titanium dioxide, wherein the first supplied polyester resin has an intrinsic viscosity of at least 0.40, said titanium dioxide having an average particle size of 0.1-0.5 .mu.m and a water content of no more than 0.5% and having been surface-treated with an aluminum compound and/or a silicon compound, and the concentration of titanium dioxide being in the range of 20-70 wt % when kneaded with the polyester resin in molten state.

REFERENCES:
patent: 3770470 (1973-11-01), Swank
patent: 4349389 (1982-09-01), Schofield

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