Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2005-06-21
2005-06-21
Hightower, P. Hampton (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S322000, C528S332000, C528S335000, C528S340000, C528S342000, C528S343000, C525S430000, C525S435000, C525S436000, C524S600000, C524S602000, C524S606000, C524S608000, C524S842000, C162S111000, C162S157200, C162S157300, C162S164100, C162S164200, C162S164300, C162S202000
Reexamination Certificate
active
06908983
ABSTRACT:
The present invention contemplates a process for forming polyaminoamide polymers formed by the reaction of a dibasic acid/ester with excess amounts of an amine; the intermediate polymer resulting therefrom; a process for synthesizing effective, high solids resins resulting from the reaction of intermediate polymers with an epihalohydrin; and the resultant high, solids resin. These resins may be used as wet strength resins in the papermaking industry.
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The mechanism of wet-stength development in paper: a review; H.H. Espy, TAPPI J., 78, 90 (1995).
Hampton Hightower P.
Hercules Corporation
O'Brien Robert O'Flynn
Samuels Gary A.
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