Molecular weight modification of thermoplastic polymers

Details Molecular weight modification of thermoplastic polymers Molecular weight modification of thermoplastic polymers

2005-09-27

2005-09-27

Wu, David W. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S100000, C524S101000, C524S086000, C524S105000, C524S306000, C524S315000

Reexamination Certificate

active

06949594

ABSTRACT:
The invention relates to a process for the molecular weight increase/crosslinking of non-halogen-containing thermoplastic polymers, in which process a composition comprising a) a non-halogen-containing thermoplastic polymer; b) a functional compound having at least two unsaturated carbon bonds; and c) an alkoxyamine having a structural unit (I), which forms free radicals at the melting temperature/processing temperature of the polymer, is mixed and heated above the melting point of the polymer in the case of crystalline polymers or the softening point in the case of amorphous polymers. The invention relates also to the composition itself, to the use thereof in increasing the molecular weight of polymers and to polymers having increased molecular weight or crosslinked polymers prepared in accordance with that process

REFERENCES:
patent: 5204473 (1993-04-01), Winter et al.
patent: 5910549 (1999-06-01), Matyjaszewski et al.
patent: 5948836 (1999-09-01), Bonora
patent: 5981674 (1999-11-01), Schombourg et al.
patent: 0742257 (1996-11-01), None
patent: 0 742 257 (1996-11-01), None
Derwent Abstract 1995-371230 [48] for JP 7252392 (1995).

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