Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2005-10-04
2005-10-04
Reddick, Judy M. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S116000, C524S195000, C524S237000, C524S381000, C524S382000, C524S405000, C524S409000, C524S410000, C524S411000, C524S412000, C524S414000, C524S416000, C524S430000, C524S431000, C524S432000, C524S436000, C524S437000, C524S494000, C524S514000
Reexamination Certificate
active
06951896
ABSTRACT:
The invention relates to a flame-retardant thermoplastic composition which comprises at least (A) a thermoplastic polymer and (B) a flame-retardant system and which also contains (C) an n-alkanelactam-substituted polymer. Such a composition shows both a good flame retardancy, in particular a short afterflame time and little dripping, and also excellent mechanical properties. In particular, the n-alkanelactam-substituted polymer is a polyolefine, substituted with n-alkanelactam groups, with n being chosen from between 2 and 12. More in particular, the n-alkanelactam is polyvinyl pyrrolidone. Preferably, the thermoplastic polymer is a polycondensation polymer, in particular a polyamide, a polyester or a polycarbonate. Particularly suitable for use as the polyamide are PA-6, PA-6,6, PA-4,6 and semi-aromatic polyamides. The flame-retardant system may be both a halogen-containing and a halogen-free system. Preferably, the flame-retardant system comprises a halogen-containing compound and an antimony-containing compound.
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DSM IP Assets B.V.
Mayer Brown Rowe & Maw LLP
Reddick Judy M.
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