Molecular weight modification of thermoplastic polymers

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

C - Chemistry, Metallurgy

08

K

C08K 5/3435 (2006.01) C08K 5/00 (2006.01) C08K 5/32 (2006.01) C08L 23/00 (2006.01)

Patent

CA 2405108

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.

L'invention concerne un procédé permettant d'augmenter le poids moléculaire de polymères thermoplastiques sans halogène, ou de réticuler lesdits polymères. L'invention concerne une composition comprenant a) un polymère thermoplastique sans halogène; b) un composé fonctionnel possédant au moins deux liaisons de carbone insaturées; et c) une alcoxyamine possédant une unité structurelle (I) qui forme des radicaux libres à la température de fusion/traitement du polymère, mélangée et chauffée au-dessus du point de fusion du polymère dans le cas de polymères cristallins ou du point de ramollissement dans le cas de polymères amorphes. L'invention concerne également la composition elle-même, son utilisation pour augmenter le poids moléculaire des polymères, et des polymères dont le poids moléculaire a été augmenté ou des polymères réticulés préparés selon ledit procédé.

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