Two step continuous polymerization method to form acrylonitrile

Details Two step continuous polymerization method to form acrylonitrile Two step continuous polymerization method to form acrylonitrile

1975-01-02

1976-06-15

Holler, Alan

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

Synthetic resins

Polymerizing in two or more physically distinct zones

526 71, 526 82, 526342, C08F 216, C08F22044

Patent

active

039636879

ABSTRACT:
A two-vessel continuous reactor system is used to make a uniform acrylonitrile copolymer containing 65 to 85% by weight acrylonitrile polymerized units and 35 to 15% by weight of styrene polymerized units. Into a first reactor are fed a free radical initiator together with an emulsified feed containing acrylonitrile, styrene and a chain transfer agent. Formation of polymer seed particles takes place in the first reactor and an outlet stream is continuously introduced into a second reactor together with added free radical initiator and a second aqueous emulsified feed containing acrylonitrile, styrene, and a chain transfer agent to continue growth of the seed particles. Conditions of particle initiation in the first reactor as opposed to particle growth in the second reactor are carefully separated to obtain noncyclical operation with low levels of coagulum formation in both reactors together with a final low emulsifier content in the polymer.
The acrylonitrile copolymer is useful for articles where barrier properties are desirable to retard passage of oxygen, carbon dioxide and water vapor, e.g., carbonated beverage bottles.

REFERENCES:
patent: 2745824 (1956-05-01), Melchore
patent: 2872438 (1959-02-01), Carroll et al.
patent: 3547857 (1970-12-01), Murray
patent: 3682873 (1972-08-01), Hozumi et al.
patent: 3819762 (1974-06-01), Howe

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