Abstract Unsaturated organo-tin mercaptides, useful as stabilisers for halogenated vinyl resins, are obtained by reacting x mols of a mercaptocarboxylic acid HSXCOOH with y1 mols of an alcohol HOYOH or mixture thereof with y2 mols of alcohol HOY''OH and/or y3 mols of alcohol ROH, where X is C1 4 alkylene or phenylene, Y is C1 10 alkylene or cycloaliphatic of five or six ring carbons, each with ethylenic and/or acetylenic bonds but not more than two of each type of bonds, Y'' is C1 10 alkylene or cycloalkylene with five or six ring carbons, R is C1 8 alkyl or alkenyl, cycloalkyl or cycloalkenyl with five or six ring carbons, or phenyl (C1 4) alkyl, with x, y1, y2 and y3 having specified interrelationships, to form an intermediate, and reacting the intermediate with a tin component, which is z1 mols of diorgano tin derivative R1 R2 SnO or R1 R2 SnCl2, or mixture thereof with z2 mols of mono-organo tin derivative which is a stannoic acid monomer or polymer (R1SnO1.5), R1SnCl3, R1Sn(OH)Cl2 or R1SN(OH)2Cl where R1 and R2 are C1 10 alkyl and x, z1 and z2 have specified interrelationships.
A process according to claim 1, wherein Y contains one ethylenic or acetylenic bond.
Claim 5
Dependent Claim
23 words
A process according to claim 1 wherein at least one of steps (a) and (b) are carried out with azeotropic removal of water.
Claim 6
Dependent Claim
19 words
A process according to claim 1 wherein step (a) is carried out in the presence of an acid catalyst.
Claim 7
Dependent Claim
26 words
A process according to claim 1 wherein step (b) is carried out in the presence of a hydrogen chloride acceptor when the tin component contains chlorine.
Claim 8
Dependent Claim
67 words
A process according to claim 1 which comprises in step (a) reacting a mercaptocarboxylic acid, which is thioglycollic or Beta -mercaptopropionic acid, with a hydroxylic component, which is 2-butyne-1,4-diol, 2-butene-1,4-diol of a mixture of 2-butene-1,4-diol and isobutanol, in the presence of p-toluenesulphonic acid to form an intermediate, and in step (b) reacting the intermediate with a tin component which is di-(n-butyl) tin oxide or di-(n-octyl) tin oxide.