Stabilizer composition for stabilizing polymers or copolymers of vinyl chloride

Claim 2

A stabilizer composition for stabilizing polymers or copolymers of vinyl chloride comprising a mixture of (a) an organotin compound or an antimony mercaptide, and (b) a synergistic amount of a compound derived from barium and a thiocarboxylic acid of the formula HSC (R 1 ) (R 2 ) OOOH, where R 1 represents a H-atom or a methyl group and R 2 represents a H-atom or a substituted or unsubstituted alkyl group having from 1 to 18 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms or a phenyl group, characterized in that compound (b) is the barium bisthiocarboxylate of said acid.

Claim 3

A stabilizer composition according to claim 1, characterized in that in addition to compound (b) it contains an amount of barium S,O-thiocarboxylate derived from said acid and which acts in synergism therewith.

Claim 4

A. stabilizer composition according to claim 2, characterized in that the molar ratio of thiocarboxylate to barium is at least 1,3.

Claim 5

A stabilizer composition according to claim 2, characterized in that the molar ratio of thiocarboxylate to barium is in the range of 1,5 to 1,7.

Claim 6

A stabilizer composition according to one or more of the preceding claims, characterized in that the organotin compound corresponds to the formula: R x Sn-z (4-z) , where x is 1 or 2, Z represents -S (CH 2 ) n COOR * where n = 1 or 2, or R2 -Sn = Z * wherein Z * is whereR represents an alkyl, cycloalkyl, aryl or mixed alkyl-aryl group having not more than 18 carbon atoms which may be substituted or not with one or more of the following groups: - OH, - CN, OR * , - CR * , or - OOOR * , where R * represents an alkyl, cycloalkyl, aryl or mixed alkyl-aryl group having not more than 18 carbon atoms.

Claim 7

A stabilizer composition according to one or more of the claims 1-4, characterized in that the organotin compound corresponds to one of the following formulae: wherein R is an alkyl group, a cycloalkyl group, an aryl group, an aralkyl group or an alkaryl group having not more than 18 carbon atoms, Y represents oxygen or sulphur and X is the rest of a polyol or polyhydric phenol having 2 to 6 hydroxyl groups after removal of one or more hydroxyl groups, the group R being substituted or not with one or more of the following groups: * - OH, - CN, - OR , or - COOR* , wherein R is an alkyl group, cycloalkyl group, aryl group or mixed alkyl-aryl group having not more than 18 carbon atoms.

Claim 8

A stabilizer composition according to one or more of the claims 1-4, characterized in that the organotin compound corresponds to the formula: Sn X 4-n , where n = 1 or 2 and R 1 represents an alkyl group having 1 to 18 carbon atoms that may optionally be substituted with an alkoxygroup having 1 to 18 carbon atoms, a polyoxyalkylene group consisting of oxyalkylene groups having 1-4 carbon atoms and as a terminal group alkyl or a hydrogen atom, a cycloalkyl group having 3 to 6 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, or a phenyl group, and wherein X stands for or -S(CR 2 ) m O C D R3 , wherein m = 1 or 2 and R 2 represents an unsubstituted or substituted alkyl, cycloalkyl, aryl, alkaryl or aralkyl group, and R 3 has the meaning of an unsubstituted or substituted alkyl, alkenyl, aryl, alkaryl, or aralkyl group, with the proviso that n = 2 when X = 1/2 S.

Claim 9

A stabilizer composition according to one or more of the claims 1-4, characterized in that the organo-antimony sulphur compound corresponds to the formula: Sb X3' where X has the meaning of sulphur, SR 1 or SR 3 COOR 2 , wherein R 1 and R 2 have the meaning of an alkyl, alkenyl, alkynyl, aryl, cycloalkyl, cycloalkenyl or mixed aryl-alkyl group having not more than 18 carbon atans, which may optionally still be substituted with a halogen atom or a -.OH ,-CN, -OR*, or -COOR* group, where R * is an alkyl group, cycloalkyl group, aryl group or mixed alkyl-aryl group having not more than 18 carbon atoms and R 3 has the meaning of an alkylene, arylene or aralkylene group having not more than 18 carbon atoms. . Polymers or copolymers of vinyl chloride containing a stabilizing amount of a stabilizer composition according to one or more of the preceding claims. Polymers or copolymers of vinyl chloride according to claim 9, characterized in that the amount of stabilizer composition is in the range of from 0,05 to 3 parts by weight per 100 parts by weight of polymer. Shaped articles entirely or partly composed of a polymer or copolymer of vinyl chloride according to claim 9 or 10.