Patent GB-912118-A (GB)
Title: Stabilisation of methylchloroform
IPC: C11D7/32
Filed: 1959-02-02
Abstract: A metal degreasing composition comprises methyl chloroform containing a stabilizing concentration of one of the following:-a ketone, a ketol, a dialkyl sulphoxide, an imine, an oxazirine, thioazirine, oxaphosphirine or thiaphosphirine of the formula <FORM:0912118/III/1> (wherein Y is nitrogen or phosphorus, Z is oxygen or sulphur and R is a C1-C4 alkyl group), a dialkyl sulphide, a dialkyl sulphite, a trialkylsilyl ether, a nitrile, including an alkylaminoalkyl cyanide, a nitroalkane, morpholine or an N-alkyl morpholine, hydrazine or an organic derivative thereof, hydroxylamine or an organic derivative thereof, dioxolane, an epoxide (oxirane compound), an N-alkylhydroxyamine, a tetraalkyl lead or a polyalkyl tin.  Any of the specified types of compound may be used in conjunction with an alcohol, especially a monohydric aliphatic alcohol or with an epoxide (oxirane compound).  Specific combinations of stabilizers which may be present are: (1) an epoxide and a dialkylsulphoxide, ketol, morpholine or an N-alkylmorpholine, hydroxylamine or an organic derivative thereof dioxolane, or a nitrile; (2) a nitroalkane and an epoxide or an aliphatic monohydric alcohol having up to 5 carbon atoms, (3) dioxolane and an aliphatic monohydric alcohol having up to 5 carbon atoms, (4) a nitrile and (a) hydroxylamine or an organic derivative thereof or (b) morpholine or an N-alkylmorpholine, and (5) a ketol and an aliphatic monohydric alcohol having up to 5 carbon atoms.  The stabilizer or stabilizer combination should generally be present in a concentration of between 0,05 and 10% and preferably from 0,05 to 5%.  Several examples are given to show the stabilizing effect of various specific stabilizers and stabilizing combinations of the specified type and a comparative example is included in which ethanol alone is present as stabilizer.  Specification 832,055 is referred to.ALSO:Methyl chloroform is stabilized by incorporating therein a stabilizing concentration of one of the following:- a ketone, a ketol, a dialkyl sulphoxide, an imine, an oxazirine, thioazirine, oxaphosphirine or thiophosphirine of the formula <FORM:0912118/IV (b)/1> (wherein Y is nitrogen or phosphorus, Z is oxygen or sulphur and R is a C1-C4 alkyl group), a dialkyl sulphide, a dialkyl sulphite, a trialkylsilyl ether, a nitrile, including an alkylaminoalkyl cyanide, a nitroalkane, morpholine or an N-alkyl morpholine, hydrazine or an organic derivative thereof, hydroxylamine or an organic derivative thereof, dioxolane, an epoxide (oxirane compound), an N-alkylhydroxyamine, a tetraalkyl lead or a polyalkyl tin.  Any of the specified types of compound may be used in conjunction with an alcohol, especially a monohydric aliphatic alcohol or with an epoxide (oxirane compound).  Specific combinations of stabilizers which may be used are: (1) an epoxide and a dialkylsulphoxide, ketol, morpholine or an N-alkylmorpholine, hydroxylamine or an organic derivative thereof, dioxolane, or a nitrile; (2) a nitroalkane and an epoxide or an aliphatic monohydric alcohol having up to 5 carbon atoms, (3) dioxolane and an aliphatic monohydric alcohol having up to 5 carbon atoms, (4) a nitrile and (a) hydroxylamine or an organic derivative thereof or (b) morpholine or an N-alkylmorpholine, and (5) a ketol and an aliphatic monohydric alcohol having up to 5 carbon atoms.  The stabilizer or stabilizer combination should generally be used in a concentration of between 0.05 and 10% and preferably from 0.05 to 5%.  Several examples are given to show the stabilizing effect of various specific stabilizers and stabilizing combinations of the specified type and a comparative example is included in which ethanol alone is p  used as stabilizer. Specification 832,055 is referred to.