Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2004-02-11
2011-12-20
Seidleck, James J (Department: 1765)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S312000, C528S315000, C528S318000, C528S323000, C528S326000
Reexamination Certificate
active
08080630
ABSTRACT:
The invention relates to a process for preparing a melt-processable polylactam by contacting caprolactam monomer with an anionic polymerization catalyst, polymerizing said monomer and contacting the resulting polylactam with a protic compound. The anionic polymerization catalyst is chosen from the group consisting of alkali-earth-metal-lactamates and alkali-earth-metal-lactamate forming compounds and the protic compound has a pKa larger than 14. The resulting polylactam has a good melt-stability and very low cyclic dimer content.
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K. Ueda et al, “Stabilization of High Molecular Weight Nylon 6 Synthesized by Anionic Polymerization of Epsilon-Caprolactam”; Polymer Journal, Society of Polymer Science; Tokyo, JP; vol. 28, No. 12; pp. 1084 1089; XP001079538.
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Bronsaer Cornelia E. M.
Frentzen Yvonne H
Janssen Nicolaas J. M. L.
Mutsers Stanislaus M. P.
Van Geenen Albert A
DSM IP Assets B.V.
Listvoyb Gregory
Nixon & Vanderhye P.C.
Seidleck James J
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