Polysilylesters having a polyalkylpiperidine as part of the polymer useful as light stabilizers for plastics

Claim 2

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 R 1 and R 2 represent methyl, ethyl or phenyl, or a copolymer thereof with a polyalkylpiperidine-free component.

Claim 3

A polysilylester according to claim 1, 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.

Claim 4

A polysilylester according to claim 1 of the general formula III, in which R 1 and R 2 independently of one another denote methyl, ethyl or phenyl and E represents one of the radicals of the formula XVIII to XXX: ##STR65## in which R denotes hydrogen or alkyl with 1-5 C atoms, R' denotes hydrogen, alkyl with 1-12 C atoms, allyl, benzyl, acetyl, acryloyl or crotonyl, X" is oxygen or NH, Z denotes a direct bond, --CH 2 CH 2 --or --OCH 2 CH 2 CH 2 --, Z 2 denotes one of the radicals --N(R")--, --NR 3 --CO--NR 3 --, --NR 3 --CO--CO--NR 3 --, --NR 3 --CO--Z 3 --CO--NR 3 --, alkylene with 4-10 C atoms, p-xylylene, ##STR66## --O--alkylene--O-- with 1-10 C atoms, --O--alkylene--O-- with 4-8 C atoms or --O--xylylene--O--, in which R 3 denotes hydrogen, alkyl with 1-12 C atoms, cyclohexyl, benzyl, or aryl with 6-14 C atoms, R" denotes alkanoyl with 1-8 C atoms or alkenoyl with 3-5 C atoms and Z 3 denotes alkylene with 1-10 C atoms or phenylene, and B' represents an alkylene radical with 2-12 C atoms, a xylylene or hexahydroxylylene radical, a cyclohexylene or 4,4'-dicyclohexylmethane radical, an arylene radical with 6-12 C atoms or a -phenylene-Z 4 -phenylene- radical, in which Z 4 denotes --CH 2 --, C(CH 3 ) 2 , --O-- or --SO 2 --, R 5 is hydrogen, methyl or phenyl, Z 5 represents alkylene or alkenylene with 4-8 C atoms, p-xylylene or a group of the formula ##STR67## Z 6 represents one of the groups --CH 2 CH 2 --, --OCH 2 CH(R 5 )--N(R 3 )--CH 2 --CH(R 5 )--, --CH 2 CH 2 --N(R 3 )--CH 2 CH(R 5 )-- or --O--(CH 2 ) 3 --N(R 3 )--CH 2 CH(R 5 )--, Z 7 is alkylene with 2-12 C atoms, arylene with 6-12 C atoms, 4,4'-dicyclohexylenemethane or a radical -phenylene-Z 4 -phenylene-, Z 7' denotes alkylene or alkenylene with 4-8 C atoms or p-xylylene and B" denotes an alkylene radical with 2-12 C atoms, an alkenylene radical with 4-8 C atoms, a xylylene or hexahydroxylylene radical, a cyclohexylene radical or a radical of the formula --CH 2 CH 2 OCH 2 CH 2 -- or --CH 2 CH 2 O--phenylene--OCH 2 CH 2 --.

Claim 5

A copolymer according to claim 1, which consists of one of the structural units listed in claim 53 and a polyalkylpiperidine-free structural unit.

Claim 6

A copolymer according to claim 4, in which the proportion of the polyalkylpiperidine-free component is at most 50 mol %.

Claim 7

A polysilylester according to claim 1 in which R is hydrogen or methyl.

Claim 8

A polysilylester according to claim 1 in which R is hydrogen.

Claim 9

A polysilylester according to claim 3 in which R' denotes hydrogen or methyl.

Claim 10

A polysilylester according to claim 8 in which R' is hydrogen.

Claim 11

A plastic stabilised against photodegradation which contains 0.005 to 5% by weight of at least one polysilylester of claim 1.

Claim 12

A stabilised plastic according to claim 10 which contains 0.01 to 1 by weight of the polymeric stabiliser.

Claim 13

A stabilised plastic according to claim 10 or 11 which additionally contains yet a further stabiliser or other additives customary in plastics technology.

Claim 14

A stabilized plastic according to claim 11 which contains 0.02 to 0.5% by weight of the polymeric stabilizer.

Claim 15

A stabilised plastic according to claims 10 or 14 said plastic being selected from the group consisting of polyolefine, styrene polymer, polyurethane or polyamide.