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
1989-03-03
1990-04-17
Pertilla, Theodore E.
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...
524425, 524451, 528481, 528503, C08K 336
Patent
active
049181343
ABSTRACT:
In a process for partially curing a powdery polyarylene sulfide resin which comprises heating the powdery resin either in the absence or presence of oxygen while agitating so as to attain an increased melt viscosity in a range suitable for further processing or molding of the resin, an improvement comprising that the resin together with an added specific inorganic additive undergoes the partial curing treatment at temperatures in the range of from a temperature just below the melting point of the starting resin down to a temperature lower by 80.degree. C. than said melting point. The additive is selected from the group consisting of silica, hydrophobic silica, talc and calcium carbonate and mixtures thereof. By use of the additive, the powder characteristics or fluidity properties of the starting resin are substantially retained during and after the partial curing treatment, the static electricity generated by agitation of the resin during the treatment is significantly reduced, and the resin is effectively prevented from forming scaling on the interior walls of the reactor vessel used for the process. Therefore, the agitation of the powdery resin can be uniformly and efficiently effected so that a desired control of the melt viscosity is easily achieved.
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Emura Noriaki
Inoue Hiroshi
Kato Toshikazu
Pertilla Theodore E.
Toso Susteel Co., Ltd.
Tosoh Corporation
Woodward David W.
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