Patent GB-979751-A (GB)
Title: Improvements in or relating to the production of polyurethane
Inventor: HAMPSON HORACE NEIL
IPC: C08G18/24
Filed: 1961-07-25
Abstract: Tin salts of acids of the general formula <FORM:0979751/C1/1> (wherein R1 and R2, when representing individual substituents are each an alkyl, cycloalkyl, aryl or aralkyl group; R3 when representing an individual substituent is a hydrogen atom or an alkyl, cycloalkyl, aryl or aralkyl group; and R1, R2 and R3 or any of these symbols, when considered jointly, are joined together to form a ring) are prepared for use as catalysts in the production of polyurethanes (see Division C3). The salt is prepared either by reacting the sodium salt of the acid with an acetone solution of stannous chloride or by heating the acid with stannous oxide and preferably also an entrainment agent for water.  In an example the acid used is a mixture of C9- 11 acids prepared by reacting alkmonoenes, carbon monoxide and water in the presence of phosphoric acid and boron trifluoride. Specifications 854,930, 867,452, 870,418, 873,264, 873,738, 875,954, 876,062, 876,533, 876,648, 878,035, 887,573, 887,988, 896,587, 928,845, 945,151 and 967,442 also are referred to.ALSO:A process for the production of a polyurethane resin comprises reacting an organic polyisocyanate or polyisothiocyanate with an organic compound containing terminal hydroxyl groups in the presence of a tin salt of one or more saturated monocarboxylic acids directly obtained by reacting at least one mono-olefin with carbon monoxide and water or indirectly obtained by reacting at least one mono-olefin with carbon monoxide or formic acid in the substantial absence of added water but in the presence of an acidic compound as catalyst to produce an intermediate compound that is then reacted with water.  (Such processes are described in, for example, Specifications 743,597, 798,065, 871,278, 883,142). Where the resin obtained contains free isocyanate or isothiocyanate groups it may be stabilized with pri. or sec. amines. It may be used in lacquers, varnishes or paints or may be converted to a rubber by heating with a basic catalyst or to a plastic by reaction with a compound containing active hydrogen atoms. The plastic can be produced in the presence of basic catalyst, surface active agent, volatile hydrocarbon or inert gas or under conditions such that carbon dioxide or carbon oxysulphide is evolved to produce a cellular structure in the resultant polyurethane. Suitable compounds with terminal hydroxyl groups are: polyoxyalkylene polyols (e.g. a propylene oxide/glycerol adduct that has been reacted with less than 10% by weight of ethylene oxide); an adduct from a primary or secondary amine and a polyepoxide resin or its reaction product with an alkylene oxide; polyesters containing terminal hydroxyl groups, including polyether esters and polyesteramides. Compounds containing active hydrogen atoms mentioned are water, glycols, primary or secondary amines, dicarboxylic acids, hydroxy amines, hydroxy acids and amino-acids. In the examples the tin salt used is of a mixture of C9- 11 synthetic saturated carboxylic acids obtained by reacting an alkene with carbon monoxide and water in the presence of phosphoric acid and boron trifluoride. The tin salt is dispersed in a propylene oxide/glycerol polyoxy alkylene polyol of M.W. 3,000 and a resin is produced by adding a mixture of toluene-2, 4- and 2, 6-diisocyanates. Specifications 854,930, 867,452, 870,418, 873,264, 873,738, 875,954, 876,062, 876,533, 876,648, 878,035, 887,573, 887,988, 896,587, 928,845, 945,151 and 967,442 also are referred to.