C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
C08K 5/00 (2006.01) C08K 5/3435 (2006.01)
Patent
CA 2665129
Scorch is inhibited during the free-radical crosslinking of a crosslinkable polymer, e.g., an EPDM, by incorporating into the polymer before melt processing and crosslinking a scorch inhibiting amount of a derivative, preferably an ether, ester or urethane derivative, of a TEMPO compound, e.g., 4-hydroxy-tetrahydrocarbylpiperidin-1-oxyl. The scorch inhibitors of this invention perform as well, if not better, than their 4-hydroxy- tetrahydrocarbylpiperidin-1-oxyl counterparts in similar polymer compositions and under similar conditions in terms of scorch inhibition and ultimate degree of crosslinking, but exhibit less volatility and less migration within the polymer composition.
On réduit le grillage au cours de la réticulation radicalaire d'un polymère réticulable, p. ex. un EPDM, par l'incorporation à ce dernier, avant fusion et réticulation, à raison d'une dose suffisante pour inhiber le grillage, d'un dérivé, de préférence un dérivé éther, ester ou uréthane, d'un composé TEMPO, p. ex. du 4-hydroxy-tétrahydrocarbylpipéridin-1-oxyle. Les retardateurs de grillage décrits fonctionnent aussi bien, sinon mieux que leurs équivalents 4-hydroxy-tétrahydrocarbylpipéridin-1-oxyle dans des compositions polymères analogues et dans des conditions analogues en termes d'inhibition du grillage et du dernier stade de réticulation, mais présentent une volatilité inférieure, et une migration réduite dans la composition polymère..
Chaudhary Bharat I.
Cogen Jeffrey M.
Eaton Robert F.
Esseghir Mohamed
Guerra Suzanne M.
Dow Global Technologies Inc.
Dow Global Technologies Llc
Smart & Biggar
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