Organotin Polyolefins

A number of miscellaneous organotin polyolefins have been produced. Treatment of tin halides or organotin halides with olefins, aluminum, and hydrogen at elevated temperatures produced materials of the general form as structure 54. Addition reactions involving organotin dihydrides and diolefins have been used to produce organotin polyolefins of structure 55 (eq. 

Alumtmun catalysts such as di-isobutyl aluminum hydride have been used in these hydrostannations to give other similar products. Trihydrides of tin, RSnH3, and diolefins react to give various products of the general structure of A simi- 

Stanno-neocarborane polymers have been synthesizied by reaction of dihthium-stannces, giving materials with degrees of polymerization of 1-20 with the general structure of 57. Softening temperatures ranged from about 50 C to 260 

A similar reaction of diethynyl dilithium salts with organotin dihalides gives materials of the structure of 58, which were reported to have interesting electrical 

Because of potential for whole-chain resonance present in these 

---

Phthalic anhydride also shows the ability to inhibit thermal destruction of polyolefins [21]. Among the organometallic compounds may be quoted organotin compounds R2Sr(OR )2, where R2 means alkyl, aryl, or cycloalkyl OR means alkoxyl, acyl, or R2Sn(CH2COORi)2, where Rj—Ci—Cm means alkyl, allyl, or benzyl Ro represents chloro-, mono-, or triorga-notin mercaptans [22,23]. 

A hindered phenolic antioxidant that does not need an organotin catalyst is marketed by Great Lakes Chemical Corp. in its Anox 20 range. It is recommended for polyolefins, polystyrene, engineering plastics, elastomers and adhesives. 

Thin-layer liquid chromatography has been employed for the determination of alkylated cresols and amine antioxidants [102, 103] in polybutadiene, phenolic antioxidants in PE [104-106] and PP [106], dilauryl and distearyl thiodipropionate antioxidants in polyolefins, ethylene-vinyl acetate copolymer, acrylonitrile-styrene terpolymer and PS, UV absorbers and organotin stabilisers in polyolefins [102], and accelerators such as guanidines, thiazoles, thiurans, sulfenamides, diethiocarbamides, and morpholine disulfides in unvulcanised rubber compounds. 

In 1849, Sir Edward Frankland reported the first example of an organotin com-poimd It was over 100 years later that Adrova et al. reported the synthesis of polyolefins with tin ester side chains (192) CrossUnked polymers incorporating organotin moieties in the structures (193) were also synthesized by Leebrick ... 

---