Macromolecular hals with a definite molecular weight
Assignee3V Sigma S.p.A.
InventorsGiuseppe Raspanti, Giorgio Zanchi
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Abstract
The present invention relates to macromolecular derivatives with a definite molecular weight, containing a 2,2,6,6-tetramethyl-4-piperidyl group and to their use as light, heat and oxidation stabilizers for synthetic polymers and other organic materials, and to the materials thus stabilized.
Claims18
Compounds of general formula (I):
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- in which:
- R is H, methyl or the —O—R4 group;
- R4 is linear or branched C1-C8 alkyl or cyclohexyl;
- R1 is hydrogen or a C1-C8 linear or branched alkyl group;
- R2 and R3, which can be the same or different, are H, C1-C8 linear or branched alkyl groups or a group of formula (II)
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- A is the —N—R2R3 group or a group of formula (III)
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- in which R, R1, R2, R3 have the meanings previously defined;
- n is from 2 to 6;
- p is from 2 to 5;
- B means groups of formulas from (IV) to (VIII);
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- where R2 and R3 have the meanings previously defined
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- in which m is from 2 to 12 and r from 1 to 3, said compounds having well defined, not polydispersed, molecular weights.
A process for the preparation of compounds of formula (I) in which R=—OR4 which comprises reacting the corresponding compounds of formula (I), in which R=H, with aliphatic or cycloaliphatic hydrocarbons in the presence of peroxides or hydroperoxides and molybdenum oxide.
Compositions comprising an organic material sensitive to the degradation induced by light, heat and oxidation, containing at least one compound of formula (I).
Mixtures of the compounds of formula (I) with other Hindered Amines Light Stabilizers containing the 2,2,6,6-tetramethyl-4-piperidyl group.
Mixtures of the compounds of formula (I) with UV adsorbers selected form 2-hydroxy benzophenone and 2-(2′-hydroxyphenyl)benzotriazole derivatives.
Mixtures of the compounds of formula (I) with benzofuranones.
Mixtures of the compounds of formula (I) with primary and secondary antioxidants.
Dependencies are inferred from the claim text.