C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
400/4107, 400/53
C07F 19/00 (2006.01) C07F 7/08 (2006.01) C07F 7/12 (2006.01) C07F 7/18 (2006.01) C08K 5/54 (2006.01) C08K 9/12 (2006.01)
Patent
CA 1291585
ABSTRACT OF THE DISCLOSURE: Reactive antioxidant compounds, able to stabilise organic polymers, contain in their molecule a sterically hindered phenolic group and a hydrolysable silyl function. In stabilising organic polymers, these reactive antioxidant compounds can be hydrolysed at the silyl function with the formation of silanol groups, which are made to interact in order to form complex resinous stabilising structures. These latter are added in stabilising quantities to the polymer to be stabilised. The hydrolysis at the silyl function and the formation of the resinous structure may take place spontaneously within the polymer to be stabilised. The reactive antioxidant compound may be added to the polymer after being stably supported on a solid support by reaction with an inorganic solid having surface hydroxyl groups. The reactive antioxidant compound can be made to interact with the polymer so that the stabilising compound becomes chemically bonded to the polymer chains. In all cases, stabilised polymers are obtained containing the antioxidant compound in a form which is not removable from the polymer. The processes for preparing the reactive antioxidant compounds and for preparing the stabilised polymer compositions are also described.
481832
Cassar Luigi
Costanzi Silvestro
Greco Alberto
Neri Carlo
Enichem Synthesis S.p.a.
Robic
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