M&t Chemicals, Inc.

William A Larkin

Jean W Bouchoux

Robert C Ringwood

Robert D Dworkin

Irving Touval

Alfred Stoloff

Organotin stabilizer compositions containing more than 5 percent by weight of monoalkyl tin derivatives of mercaptoacetic acid esters, such as mono-n-octyltin-S,S',S'-tris(isooctyl mercaptoacetate), are useful as food-grade stabilizers for vinyl halide polymers.

Non-toxic organotin stabilizers for vinyl chloride polymers

Vinyl chloride polymers suitable for use in food packaging materials are stabilized against discoloration and embrittlement resulting from exposure to heat using mono-n-octyltin compounds of the general formula H.sub.17 C.sub.8 Sn(SCH.sub.2 COOR').sub.3, wherein R' represents an alkyl radical containing eight carbon atoms.

Monoalkyl tin derivatives of mercaptoacetic acid esters, such as mono-n-octyltin-S,S', S'-tris(isooctyl mercaptoacetate), are useful as food-grade stabilizers for vinyl halide polymers.

Food-grade vinyl halide polymer compositions stabilized with

This invention relates to novel organotin compounds containing at least one sulfur atom that is bonded exclusively to tin or to tin and hydrogen. The compounds are derivatives of mercaptoalkanols, which are present as the free alcohols, as esters of polycarboxylic acids, esters of acids containing specified non-metallic elements or as alkoxides of specified metallic elements. The compounds are effective catalysts for a variety of reactions and impart heat stability to halogen-containing resins.

Organotin mercaptoalkanol esters and alkoxides containing sulfide groups

In accordance with certain of its aspects, this invention relates to stabilizing compositions; to stabilized polymers; and to the process for preparing a novel halogen-containing polymer stabilized against the deteriorative effect of heat which comprises adding to a halogen-containing resin a stabilizing amount of: a first stabilizer having the formula RSn(SR').sub.3 wherein R is selected from the group consisting of methyl, butyl and octyl radicals and R' is a residue of a carboxylic acid ester derived from acetic or propionic acid and a monohydric alcohol containing between 8 and 12 carbon atoms or a dodecyl hydrocarbon radical; and a second stabilizer of the formula R'.sub.2 Sn.dbd.S wherein R' represents a monovalent hydrocarbon radical selected from the group consisting of methyl and butyl radicals.

Organotin stabilizer composition

Finely divided or vaporized organic and inorganic tin compounds are conventionally applied to heated glass articles to produce a coating of stannic oxide on the article. Superior coatings are obtained when the tin compound is butyltin trichloride. This compound offers the additional advantage of being recoverable in substantially pure form.

Method for coating glass using monoalkyltin trihalides

The coefficient of friction of glass is decreased and the scratch resistance is improved by applying finely divided or vaporized butyltin trichloride to the heated glass articles to produce a coating of stannic oxide on the glass. The glass is then coated with a conventional lubricating wax.

Process of applying tin oxide on glass using butyltin trichloride

The flame retardancy imparted to synthetic organic polymers by a halogen source is significantly increased by the presence of zinc sulfide in the polymer composition. One or more specified basic compounds are optionally included to neutralize any acidic materials generated during pyrolysis of the polymer composition.

Flame retarding agents and polymer compositions containing same

Hexaorgano distannanes of the general formula R.sub.3 Sn--SnR.sub.3 significantly reduce or eliminate the discoloration which occurs when mixtures containing an alkali metal salt of a lactam are stored under an inert atmosphere for extended periods of time at temperatures between ambient and 100.degree. C. R in the foregoing formula represents a monovalent hydrocarbon radical containing between 1 and 20 carbon atoms.

Polylactam composition containing hexaorgano distannane

The melt viscosity of vinyl chloride polymers is effectively stabilized using linear polysulfides containing specified elements or organic radicals as terminal groups on the chains of sulfur atoms.

Melt viscosity stabilizers for vinyl chloride polymers

Certain organotin halides can be recovered in substantially quantitative yield from aqueous media containing an ammonia or amine complex of these halides by adding (1) a non-reactive highly soluble inorganic salt to partially or completely saturate the solution and (2) an amount of a suitable mineral acid sufficient to decompose said complex and then heating the resultant solution as required to effect a separation of the resultant organotin halide from the aqueous phase.

Process for recovering organotin halides

Hexaorgano distannanes of the general formula R.sub.3 Sn-SnR.sub.3 significantly reduce or eliminate the discoloration which occurs when mixtures containing an alkali metal salt of a lactam are stored under an inert atmosphere for extended periods of time at temperatures between ambient and 100.degree.C. R in the foregoing formula represents a monovalent hydrocarbon radical containing between 1 and 20 carbon atoms.

Stabilized epsilon caprolactam composition and method for preparing same

The heat stability imparted to vinyl polymers by a given concentration of certain sulfur-containing organotin compounds is not adversely affected with respect to either long term stability or delay in appearance of initial discoloration when a portion of the sulfur-containing organotin compound is replaced by certain less effective organotin stabilizers, including tetraorganotin compounds and diorganotin carboxylates.

Stabilized vinyl chloride polymer compositions

Certain organotin halides can be recovered in substantially quantitative yield from their aqueous solutions by adding a non-reactive highly soluble inorganic salt to partially or completely saturate the solution and then heating the resultant solution as required to effect a separation of the organotin halide from the aqueous phase.

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Morristown, NJ, United States of America

William A Larkin