Process for making copolymers of maleic anhydride and a C.sub.1

Details Process for making copolymers of maleic anhydride and a C.sub.1 Process for making copolymers of maleic anhydride and a C.sub.1

1990-05-21

1991-03-26

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

528498, 526271, 526332, C08F 200, C08F 600, C08F 3400, C08F 1612

Patent

active

050030140

ABSTRACT:
What is described herein is a process for making copolymers of maleic anhydride and C.sub.1 -C.sub.4 alkyl vinyl ethers of predetermined specific viscosities extending over a wide viscosity range. The invention is characterized by (a) precharging a reactor with a C.sub.1 -C.sub.4 alkyl vinyl ether as solvent and a polymerization initiator at a reaction temperature, (b) feeding a mixture of maleic anhydride and a C.sub.1 -C.sub.4 alkyl vinyl ether in substantially stoichiometric amounts, preferably with a slight excess of alkyl ether, and at a selected rate, into said precharged reactor, (c) polymerizing said reactants to form a slurry of said copolymer in said escess alkyl vinyl ether solvent, and (d) introducing toluene into said reactor during the polymerization to control the specific viscosity of the copolymer product being produced.

REFERENCES:
patent: 4255309 (1981-03-01), Klaessig et al.
patent: 4532320 (1985-07-01), Denzinger et al.
H. F. Mark, N. M. Bikales, C. G. Overberger, and G. Menges, Encyclopedia of Polymer Science and Engineering, vol. 9, p. 255 [Wiley-Interscience Publication] 1987.
James A. Kent, Riegel's Industrial Chemistry, (Reinhold Publishing Corp), 1962, pp. 303 and 305.

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