Process for the stabilization of hdpe

Details Process for the stabilization of hdpe Process for the stabilization of hdpe

C - Chemistry, Metallurgy

08

L

C08L 23/06 (2006.01) C08K 3/22 (2006.01) C08K 5/13 (2006.01) C08K 5/524 (2006.01) C08K 5/5393 (2006.01) C08K 13/02 (2006.01)

Patent

CA 2182603

High-density polyethylene (HDPE) which experiences a reduction in molecular weight during processing and is obtainable by means of catalysts of the Ziegler-Natta type can be stabilized against thermo-oxidative degradation by addition of a combination of a sterically hindered phenol and an organic phosphite or phosphonite and calcium oxide.

Le polyéthylène haute densité (HDPE) subit une réduction de poids moléculaire lors de son traitement, et peut être obtenu au moyen de catalyseurs du type Ziegler-Natta; afin d'empêcher sa dégradation thermo-oxydative, on peut le stabiliser en ajoutant une combinaison d'un phénol empêché stériquement, d'un phosphite ou phosphonite organique et d'un oxyde de calcium.

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