Stabilization of synthetic polymers

Claim 2

A synthetic polymer composition stabilized against photo- and thermal deterioration wherein there is incorporated, in a sufficient amount to prevent said deterioration, a compound having the formula ##STR3## wherein R and R', which may be the same or different, and each represents hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aralkyl group, a hydroxyalkyl group, an alkoxyalkyl group, an aliphatic or aromatic acyloxyalkyl group, a cyanoalkyl group, a halogenoalkyl group, an epoxyalkyl group, an alkoxycarbonylalkyl group, an aliphatic acyl group, an alkoxycarbonyl group or an aralkoxycarbonyl group, or an acid addition salt thereof.

Claim 3

The synthetic polymer composition according to claim 1, wherein R and R', which may be the same or different, and each represents hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 3 to 6 carbon atoms, an alkynyl group having 3 to 4 carbon atoms, an aralkyl group having 6 carbon atoms in the aryl and 1 or 2 carbon atoms in the alkyl, a hydroxyalkyl group having 1 to 4 carbon atoms, an alkoxyalkyl group having 1 to 8 carbon atoms in the alkoxy and 1 to 4 carbon atoms in the alkyl, an aliphatic acyloxyalkyl group of which acyl is either saturated and having 2 to 18 carbon atoms or unsaturated and having 3 to 6 carbon atoms, and of which alkyl having 1 to 4 carbon atoms, an aromatic acyloxyalkyl group of which aromatic ring may be substituted with 1 to 3 substituents selected from an alkyl having 1 to 4 carbon atoms and hydroxy, and of which alkyl having 1 to 4 carbon atoms, a cyanoalkyl group having 2 or 3 carbon atoms, a halogenoalkyl group having 1 to 3 carbon atoms, 2,3-epoxypropyl group, an alkoxycarbonylalkyl group having 1 to 18 carbon atoms in the alkoxy and 1 or 2 carbon atoms in the alkyl, an aliphatic acyl group which may be saturated and having 2 to 8 carbon atoms or unsaturated and having 3 or 4 carbon atoms, an alkoxycarbonyl group having 2 to 9 carbon atoms or an benzyloxycarbonyl group.

Claim 4

The synthetic polymer composition according to claim 1, wherein both of R and R' are hydrogen atom, an alkyl group having 1 to 4 carbon atoms, allyl group, benzyl group, an alkoxyalkyl group having 1 to 4 carbon atoms in the alkoxy and 1 or 2 carbon atoms in the alkyl, an aliphatic acyloxyethyl group of which acyl is either saturated annd having 2 to 18 carbon atoms or unsaturated and having 3 to 6 carbon atoms in the acyl, a benzoyloxyethyl group of which benzene ring may be substituted with 1 to 3 substituents selected from an alkyl having 1 to 4 carbon atoms and hydroxy or an alkoxycarbonylmethyl group having 1 to 8 carbon atoms in the alkoxy.

Claim 5

The synthetic polymer composition according to claim 1, wherein both of R and R' represent hydrogen atom, an alkyl group having 1 to 4 carbon atoms, allyl group, benzyl group or an alkoxycarbonylmethyl group having 1 to 8 carbon atoms in the alkoxy.

Claim 6

The synthetic polymer composition according to claim 1, wherein said compound (I) or an acid addition salt thereof is incorporated in an amount of 0.01 - 5.0% by weight, based on the amount of the synthetic polymer.

Claim 7

The synthetic polymer composition according to claim 1, wherein said polymer is a polyolefin.

Claim 8

The synthetic polymer composition according to claim 1, wherein said polymer is selected from a group consisting of a polyvinyl chloride, a polyvinylidene chloride, a polyacetal, a polyester, a polyester ether, a polyamide having recurring amide groups as integral parts of the main polymer chain, a polyurethane, a polycarbonate and an epoxy resin.

Claim 9

The synthetic polymer composition according to claim 1, wherein said compound (I) is selected from the group consisting of 4,4'-dihydroxy-2,2,6,6,2',2',6',6',-octamethyl-4,4'-bipiperidyyl, 4,4'-dihydroxy-1,2,2,6,6,1',2',2',6',6',-decamethyl-4,4'-bipiperidyl, 1,1'-diallyl-4,4'-dihydroxy-2,2,6,6,2',2',6',6'-octamethyl-b 4,4'-bipiperidyl, 1,1'-dibenzyl-4,4'-dihydroxy-2,2,6,6,2',2',6',6'-octamethyl-4,4'-bipiperidyl and 1,1'-bis(ethoxycarbonylmethyl)-4,4'-dihydroxy-2,2,6,6,2',2',6',6'-octamethyl-4,4'-bipiperidyl.