Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1989-04-07
1991-11-19
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528342, 526 85, C08G 6926, C08F 238
Patent
active
050667700
ABSTRACT:
A process for manufacturing a polymer includes the first step of reacting a solution of one of two starting materials in an organic solvent with the other material in the form of a powder, and the second step of reacting a solution of the reaction product of the first step in an organic solvent with a solution of the other material in an organic solvent. The process preferably includes one or both of two additional steps, i.e. filtering the reaction product of the first step, and degassing the reaction product of the second step by stirring it at a reduced pressure. An apparatus for carrying out the process is also disclosed. This invention makes it possible to produce a polymer of high and uniform quality having a final viscosity controlled within a certain range and not containing foreign matter or bubbles.
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patent: 4321319 (1982-03-01), Shoji et al.
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patent: 4603193 (1986-07-01), Richardson et al.
Journal of Polymer Science: Polymer Chemistry Edition, vol. 19, 1981 pp. 795-805, John Wiley & Son, Inc.; D. Kumar; "Condensation Polymerization of of Pyromellitic Dianhydride with Aromatic Mechanism".
Nagano Hirosaku
Noguchi Takehiko
Sakubata Takashi
Kanegafuchi Kagaku Kogyo & Kabushiki Kaisha
Kight III John
Shelborne Kathryne J.
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