Polysilylesters having a polyalkylpiperidine as part of the polymer useful as light stabilizers for plastics
First Claim
1. A polysilylester of the formula ##STR60## wherein n denotes a value of from 2 to about 50, E represents a divalent organic radical 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 R1 and R2 represent methyl, ethyl or phenyl, or a copolymer thereof with a polyalkylpiperidine-free component.
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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 of 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.
24 Citations
14 Claims
- 1. A polysilylester of the formula ##STR60## wherein n denotes a value of from 2 to about 50, E represents a divalent organic radical 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 R1 and R2 represent methyl, ethyl or phenyl, or a copolymer thereof with a polyalkylpiperidine-free component.
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