Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2006-03-07
2006-03-07
Hightower, P. Hampton (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S335000, C528S332000, C528S340000, C528S348000, C528S349000
Reexamination Certificate
active
07009028
ABSTRACT:
In a two-step precondensate process for preparing polyamides diamines are reacted with dicarboxylic acid dihalides in a polar, non-basic, inert organic liquid medium under conditions such that a condensation product having a low degree of polymerization is formed. The resulting condensation then is contacted with an aqueous solution of a water-soluble acid acceptor by continuously feeding the components into a reactor system having a total residence time from about 2 seconds to about 2 minutes, and having a Peclet number greater than about 3.5 to form a polyamide product having a high degree of polymerization.
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Etchells, III Arthur William
Mallon Frederick K.
E. I. du Pont de Nemours and Company
Hampton Hightower P.
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