Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1987-08-11
1992-05-26
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528179, 528185, 528352, 525420, 525432, C08F28304, C08G 6300, C08G 6942, C08L 7700
Patent
active
051169398
ABSTRACT:
A process for preparing polyimides having enhanced melt flow properties is described. The process consists of heating a mixture of a high molecular weight poly(amic acid) or polyimide with a low molecular weight amic acid or imide additive in the range of 0.05 to 15% by weight of additive. The polyimide powders so obtained show improved processability, as evidenced by lower melt viscosity by capillary rheometry. Likewise, films prepared from mixtures of polymers with additives show improved processability with earlier onset of stretching by TMA.
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Burks Harold D.
Fletcher James C.
Pratt J. Richard
St. Clair Terry L.
Stoakley Diane M.
Adams Harold W.
Hampton-Hightower P.
Helfrich George F.
Kight III John
Manning John R.
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