Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1992-03-16
1993-06-29
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524379, 525304, 5253277, 526 79, C08L 3100, C08F 814, C08F 2008
Patent
active
052235670
ABSTRACT:
There is described a process for the production of an ethanol solution of an ethyl or butyl half-ester copolymer of maleic anhydride and a methyl vinyl ether which comprises: (a) copolymerizing the monomers in acetone as solvent by simultaneously feeding molten maleic anhydride, a molar excess of methyl vinyl ether, and a solution of a free radical initiator in acetone, into a reactor precharged with acetone, at about 68.degree.-85.degree. C., preferably 70.degree.-80.degree. C.; (b) esterifying the acetone solution of said copolymer with ethanol or butanol; and then (c) solvent exchanging ethanol for acetone by continuously injecting vapors of ethanol at about 85.degree.-95.degree. C. into said copolymer solution while simultaneously distilling out acetone therefrom at atmospheric pressure.
REFERENCES:
patent: 4908413 (1990-03-01), Goertz et al.
patent: 4939198 (1990-07-01), Tazi et al.
Carlin Alan J.
Tazi Mohammed
Zamora John N.
DeWitt LaVonda
ISP Investments Inc.
Katz Walter
Maue Marilyn J.
Michl Paul R.
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