Process for producing a low-particle-content transparent thermop

Details Process for producing a low-particle-content transparent thermop Process for producing a low-particle-content transparent thermop

1988-02-08

1992-03-10

Schofer, Joseph L.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

522332, 522342, G08J 300

Patent

active

050950495

ABSTRACT:
A process for producing a low-particle-content transparent thermoplastic resin solution, which comprises centrifuging a solution of a transparent thermoplastic resin containing free water to separate it into a resin solution phase, an aqueous phase and an intermediate layer, and separating the resin solution phase from the aqueous phase and the intermediate layer. By this process, the number of particles having a size of at least 0.5 .mu.m in the resin solution can be decreased to 10,000 or less, preferably substantially zero, per gram of the transparent thermoplastic resin.

REFERENCES:
patent: 3415772 (1968-12-01), La Heij et al.
patent: 4323519 (1982-04-01), Mori et al.

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