Organotin stabilizer composition containing more than 20 percent tin and resin compositions containing the same

Abstract

A polyvinyl chloride resin stabilizer is provided having a high concentration of tin, in the range from about 20 to about 35% by weight, and a high concentration of sulfur, within the range from about 10 to about 25% sulfur, comprising .[.an.]. .Iadd.a di .Iaddend.organotin .Iadd.di .Iaddend.alpha- or beta-mercapto carboxylic acid ester and an organotin sulfide. Polyvinyl chloride resin compositions are also provided containing these stabilizers.

Having regard for the foregoing disclosure, the following is claimed as the inventive and patentable embodiments thereof: 
     
       1. A stabilizer composition for improving the resistance to deterioration of polyvinyl chloride resins when heated at 350° F., consisting essentially of an organotin alpha- or beta-mercapto carboxylic acid ester having the formula ##STR29## wherein R' is an alkyl radical linked to tin through carbon and having from one to about eight carbon atoms, Z is a bivalent alkylene radical having from one to about two carbon atoms, and carrying the --S-- and --COOR" groups, and R" is an organic group derived from a monohydric or polyhydric alcohol having from one to about two hydroxyl groups and from one to about fifteen carbon atoms, .Iadd.and .Iaddend.m is an integer from 1 to 2, .[.and n is an integer from 1 to 2,.]. the S--Z--(COOR") m  group being derived from an alpha- or beta-mercaptocarboxylic acid ester; and an organotin sulfide having the formula R 2  SnS, in which R is alkyl linked to tin through carbon and has from one to about eight carbon atoms, the organotin compounds together comprising an amount of tin within the range from about 20 to about 35% by weight, and an amount of sulfur within the range from about 10 to about 35% by weight. 
     
     
       2. A stabilizer composition in accordance with claim 1, in which the organotin mercaptocarboxylic acid ester is an organotin thioglycolate. 
     
     
       3. A stablizer composition in accordance with claim 1, in which the organotin sulfide is dibutyl tin sulfide and the organotin mercaptocarboxylic acid ester is .[.monobutyl.]. .Iadd.dibutyl .Iaddend.tin or .[.monooctyl.]. .Iadd.dioctyl .Iaddend.tin .[.tris(isooctyl.]. .Iadd.bis(octyl .Iaddend.tin thioglycolate. .[.4. A 
     
     
        stabilizer composition according to claim 1, in which n is 1..]. 5. A stabilizer composition according to claim .[.4,.]. .Iadd.1, .Iaddend.in which the organotin mercaptocarboxylic acid ester is .[.monobutyl.]. .Iadd.dibutyl .Iaddend.tin .[.tris(isoocytyl.]. .Iadd.bis(isooctyl .Iaddend.thioglycolate) and the organotin sulfide is dibutyl tin sulfide. 
     
     
         . A stabilizer composition according to claim .[.4.]. .Iadd.1 .Iaddend.in which the organotin mercaptocarboxylic acid ester is .[.monobutyl.]. .Iadd.dibutyl .Iaddend.tin .[.tris(isoocotyl.]. .Iadd.bis(isoocotyl .Iaddend.thioglycolate) and the organotin sulfide is dioctyl tin sulfide. 
     
     
         . A stabilizer composition according to claim .[.4,.]. .Iadd.1 .Iaddend.in which the organotin mercaptocarboxylic acid ester is .[.monobutyl.]. .Iadd.dibutyl .Iaddend.tin .[.tris(isooctyl.]. 
     
     
        .Iadd.bis(isooctyl .Iaddend.thioglycolate). 8. A stabilizer composition according to claim .[.4,.]. .Iadd.1 .Iaddend.in which the organotin 
     
     
        sulfide is dibutyl tin sulfide. 9. A polyvinyl chloride resin composition having an enhanced resistance to deterioration when heated at 350° F., consisting essentially of a polyvinyl chloride resin and a stabilizer 
     
     
        composition in accordance with claim 1. 10. A polyvinyl chloride resin composition in accordance with claim 9 in which the polyvinyl chloride 
     
     
        resin is polyvinyl chloride homopolymer. 11. A polyvinyl chloride resin composition in accordance with claim 9 in which the polyvinyl chloride 
     
     
        resin is a copolymer of vinyl chloride and vinyl acetate. 12. A polyvinyl chloride resin composition in accordance with claim 9 in which the amount of stabilizer composition is within the range from about 0.25% to about 
     
     
        15% by weight of the composition. 13. A polyvinyl chloride resin composition in accordance with claim 9 including in addition a polyvalent 
     
     
        metal salt of an aliphatic fatty acid. 14. A polyvinyl chloride resin composition in accordance with claim 9 including in addition an organic 
     
     
        phosphite. 15. A polyvinyl chloride resin composition in accordance with 
     
     
        claim 9 including in addition an epoxy compound. 16. A polyvinyl chloride resin composition in accordance with claim 9 including in addition a plasticizer for the resin in an amount in excess of about 15% by weight. 
     
     
          . A rigid polyvinyl chloride resin composition in accordance with claim 9 comprising a plasticizer in an amount up to about 10% by weight of the composition.