Patent GB-749722-A (GB)
Title: Improvements in sulphur-containing organotin reaction products
IPC: C08K5/57
Filed: 1953-11-09
Abstract: Polyvinyl chloride compositions containing a plasticiser (di-2-ethyl hexyl phthalate, tricresyl phosphate) and especially lead compounds (basic lead carbonate, basic lead phosphite, di-basic lead stearate) and if desired a pigment (titanium dioxide) may be stabilized against deterioration by light and heat by the addition of a six-fold co-ordination compound containing both Sn-S and Sn-O bonds and obtained from an alcohol, a dibasic organic acid or its anhydride, a dihydrocarbon tin oxide and a mercapto-acid ester (see Group IV (b)).ALSO:The invention comprises reaction products of an alcohol, a dibasic organic acid (or its anhydride), a dihydrocarbontin oxide and a mercapto-acid ester, the products containing both Sn-S and Sn-O bonds.  The anions of the simplest members of this group of products may have the formula <FORM:0749722/IV(a)/1> where R is an alkyl, aryl or alkyl residue, D is a dibasic acid residue, Q is a mercaptoacid residue and T is an alcohol residue. The organo stannate anions may be satisfied electrically by protons or organotin cations to form neutral complexes.  More complex products contain a plurality of hydrocarbon tin groups linked by covalent or co-ordinate bonds to the dibasic acid residues.  The alcohol may be substituted or unsubstituted, saturated or unsaturated, aliphatic or aromatic: specified alcohols include iso-octyl alcohol, lauryl alcohol, dihydroabietyl alcohol, octadecyl alcohol and phenol.  Specific dibasic acids include maleic, itaconic, phthalic, succinic and adipic acids (these may be used as their anhydrides).  The dihydrocarbontin oxide may be dibutyl, dimethyl, diphenyl or dibenzyl oxide.  An a - or b -mercaptoacid ester may be used such as iso-octyl mercaptoacetate, iso-octyl b -mercapto propionate, di-2-butyl octyl thiomalate or phenoxyethyl b -mercapto-propionate.  The reagents may react in any order, but it is preferred to react the alcohol with the dibasic organic acid, then add the dihydrocarbon tin oxide and then to react this product with the mercaptoacid ester.  The proportions may be stoichiometric or not as desired. The products may be used as stabilizers for vinyl chloride resins, rubber accelerators and anti-oxidants, lubricating oil additives and polymerization accelerators.  The examples describe the production of compounds from (1) iso-octyl alcohol, maleic anhydride, dibutyl tin oxide and iso-octyl mercaptoacetate; (6) iso-octyl alcohol, maleic anhydride, dibutyl tin oxide and di-2-butyl octyl thiomalate; (10) iso-octyl alcohol, itaconic anhydride, dibutyl tin oxide and iso-octyl mercaptoacetate; (11) iso-octyl alcohol, maleic anhydride, dibutyl tin oxide and phenoxyethyl b -mercaptopropionate; (12) iso-octyl alcohol, maleic anhydride, diphenyl tin oxide and iso-octyl mercaptoacetate; (13) as in (1) using phthalic anhydride; (14) as in (1) using succinic anhydride; and (15) as in (1) using adipic anhydride.ALSO:Six-fold co-ordination compounds containing both tin-sulphur and tin-oxygen bonds and obtained from an alcohol, a dibasic organic acid or its anhydride, a dihydrocarbon tin oxide and a mercaptoacid ester (see Group IV(b)) may be used as rubber accelerators and antioxidants.