Polymeric light stabilizers for plastics
AssigneeCiba-Geigy Corporation
InventorsJean Rody, Michael Rasberger
Life of this patent
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Abstract
Condensation polymers or addition polymers which contain sterically hindered polyalkylpiperidine groups are proposed as light stabilizers for plastics. The polymers concerned are relatively low-molecular polymers and a difunctional derivative of a polyalkylpiperidine is additionally used for the manufacture of these. The piperidine radical can be present in the main chain or as a side group or the polymeric stabilizer. Polymeric stabilizers of this type do not tend to migrate out of the plastic or to be removed by extraction; they are therefore very permanent in use.
Claims21
A polyamide, the recurrent molecular unit of which contains a polyalkylpiperidine radical of the formula ##STR61## or is substituted by a polyalkylpiperidine side group of the formula ##STR62## in which R denotes hydrogen or alkyl with 1-5 C atoms and R' denotes hydrogen, alkyl with 1-12 C atoms, alkenyl with 3-8 C atoms, alkinyl with 3-6 C atoms, aralkyl with 7-12 C atoms, alkanoyl with 1-8 C atoms or alkenoyl with 3-5 C atoms, and copolymers thereof with polyalkylpiperidine-free components.
A polyamide, the recurrent molecular unit of which contains a polyalkylpiperidine radical of the formula ##STR63## or is substituted by a polyalkylpiperidine side group of the formula ##STR64## in which R denotes hydrogen or an alkyl radical with 1-5 C atoms and R' denotes hydrogen, alkyl with 1-12 C atoms, allyl, benzyl, acetyl, acryloyl or crotonyl.
A polyamide according to claim 1 or 2, of the general formula I or II ##STR65## in which n denotes a value from 2 to about 50, X and X' denote NY and Y denotes hydrogen, alkyl with 1-18 C atoms, cycloalkyl with 5-12 C atoms, aralkyl with 7-11 C atoms, aryl with 6-14 C atoms or a polyalkylpiperidine radical of the formula VIII ##STR66## in which R and R' are as defined in claim 50 and Z represents a direct bond, the group --CH.sub.2 CH.sub.2 -- or the group --OCH.sub.2 CH.sub.2 CH.sub.2 --;
- A, B and D denote divalent organic radicals, and wherein in each of the formulae I and II, at least one polyalkylpiperidine radical is present in the main chain or as a side group.
A polyamide according to claim 3 of the general formula I, in which X is NY and X' is NH or NY, A is as defined in claim 5, B is as defined in claim 53 and Y is a polyalkylpiperidine radical of the formula XL ##STR72## in which R and R.sup.1 are as defined in claim 3.
Dependencies are inferred from the claim text.