Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Effecting a change in a polymerization process in response...
Patent
1977-05-16
1978-03-28
Hamrock, William F.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Effecting a change in a polymerization process in response...
526 16, 526 30, 528481, C08F 814, C08F 850
Patent
active
040815870
ABSTRACT:
A process is provided for preparing a copolymer of ethylene and acrylic or methacrylic acid. Typically, a copolymer of ethylene and methyl acrylate is dissolved in a diarylalkane such as 1,1-dixylylethane. A transesterification catalyst and either isopropanol or tertiary butanol is added to the polymer solution which then is heated to reflux to convert the polymerized methyl acrylate moiety to the isopropyl or tertiary butyl acrylate moiety. Following completion of the transesterification reaction, any excess isopropanol or tertiary butanol is removed from the reaction system by distillation. The polymer solution then is heated to a temperature of the order of 320.degree. C to thermally crack the isopropyl or tertiary butyl acrylate and form the corresponding ethylene-acrylic acid copolymer. The ethylene-acrylic acid copolymer is insoluble in the diarylalkane and can be recovered by filtration.
REFERENCES:
patent: 2109877 (1938-03-01), Burrett
patent: 3249570 (1966-05-01), Potts et al.
Clampitt Bert H.
Gilbert Ronald E.
Gulf Oil Corporation
Hamrock William F.
Kelly Richard L.
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