Process for the preparation of styrene and acrylonitrile contain

Details Process for the preparation of styrene and acrylonitrile contain Process for the preparation of styrene and acrylonitrile contain

1979-06-25

1981-01-06

Hamrock, William F.

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

Synthetic resins

Removing and recycling removed material from an ongoing...

526 67, 526 77, C08F 200

Patent

active

042437814

ABSTRACT:
A process is disclosed for the preparation of styrene and acrylonitrile containing polymers wherein styrene and acrylonitrile in a predetermined ratio are introduced continuously into a recirculating polymerization zone of generally constant composition wherein a portion of the styrene and acrylonitrile is polymerized, material is removed from the polymerization zone at a rate equal to the addition of styrene and acrylonitrile on removal from the polymerization zone the monomer being separated from the resulting polymer, the improvement being maintaining a level of oxygen in the styrene and acrylonitrile not greater than 20 parts per million by weight based on the weight of the styrene and acrylonitrile. The resultant polymer is generally colorless.

REFERENCES:
patent: 2769804 (1956-11-01), Hansen
patent: 2853476 (1958-09-01), Kennedy et al.
patent: 2989517 (1961-06-01), Hanson et al.
patent: 3356660 (1967-12-01), Moritz et al.
patent: 4061858 (1977-12-01), Wild et al.

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