Method for controlling a polymerization rate of styrene resins

Details Method for controlling a polymerization rate of styrene resins Method for controlling a polymerization rate of styrene resins

1996-07-18

1997-09-09

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5262191, 526227, 526232, 5262323, 526346, C08F 432, C08F 1208

Patent

active

056658338

ABSTRACT:
The method for controlling a polymerization rate, in a continuous radical polymerization of mainly styrene monomer using a complete mixing type reactor, without substantially changing an average molecular weight of a polymer formed, comprising the steps of: (a) keeping a polymerization temperature substantially constant at t(.degree.C.), (b) setting a feeding rate of the styrene monomer to A times larger rate than that in a polymerization conducted in the absence of a radical polymerization initiator, and (c) controlling an amount of the radical polymerization initiator added in the range of from (0.1
).times.10.sup.-3 to (2.0
).times.10.sup.-3 mol per 1 liter of the monomer, n being a number of radical generating functional groups present in one molecule of the radical polymerization initiator, such that a polymer concentration x satisfy the mathematical expression: x.gtoreq.0.3t+6.multidot.(A-1)+12 and that x be kept substantially constant, wherein A represents a ratio of a polymerization rate after being controlled to a rate of polymerization conducted in the absent of the radical polymerization initiator. The method can easily and as desired control the polymerization rate using any desired radical polymerization initiator.

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patent: 4367320 (1983-01-01), Murray
patent: 4404338 (1983-09-01), De Toffol et al.
patent: 4628034 (1986-12-01), Hofferber
patent: 4948847 (1990-08-01), Morita et al.
patent: 5191040 (1993-03-01), Okumura et al.

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