GB1100963A - Stabilized polyalkylene oxides and process for preparing them - Google Patents

Abstract

Polyalkylene oxides are stabilized by a mixture of the following compounds <FORM:1100963/C3/1> <FORM:1100963/C3/2> and (c) R4SnR5, in which K is a substituted, or unsubstituted benzene or naphthalene radical, R is a hydrogen atom or an alkyl, aryl or heterocyclic radical, R1 is an alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical, A is -CH2- or -S-, R2 and R3 are alkyl radicals of 1 to 4 carbon atoms, n is 1 to 4 and R4, R5 are alkyl radicals or -(CH2)mCOOR6, in which R6 is an alkyl radical and m is 1 to 4. Suitable polyalkylene oxides are those obtained by polymerizing saturated alkylene oxides, halo-substituted epoxides, including epichlorohydrin, cycloaliphatic epoxides or epoxyethers, including glycidyl ethers, or by copolymerizing saturated epoxides with unsaturated epoxides, e.g. glycidyl acrylate. Typical examples of compound (a) have K as a benzene ring, R is methyl on the carbonyl group and hydrogen on the nitrogen, and R1 is the heptadecyl, benzthiazole, 1,2,4-triazole, benzotriazoles or imidazole radical. Typical examples of compounds (b) are bis (4 - hydroxy - 2 - methyl - 5 - t - butyl - phenyl)methane, and bis (4-hydroxy-2,5-di-t-butyl-phenyl)sulphide. Typical examples of compounds (c) are di(dodecyl)sulphide, di(octadecyl)trisulphide, and trisulphide (diacetic acid octadecyl ester). The stabilizer may be added as a solid or in a solution. The stabilized polymers may be dissolved or caused to swell, and may be cross-linked. Swelling agents or solvents include: -dimethyl formamide, tetramethylene sulphone, dioxan, methanol, benzene, and chlorinated hydrocarbons. Soots, fillers, dyes or pigments, extender oils or lubricants may also be added. The example describes the stabilization of a methanolic solution of a propylene oxide-allyl glycidyl ether copolymer, thiourea, silicic acid, zinc oxide, dipentamethylene thiuram tetrasulphide, 2-mercaptobenzothiazole, and titanium dioxide with a mixture of 2% the compounds (a) which have K as benzene, R on the carbonyl is methyl, R on the nitrogen is hydrogen, and R1 is heptadecyl or benzothiazole, 0.5% of bis(4-hydroxy-5 - t - butyl - 2 - methyl - phenyl) sulphide and 0.5% of di(octadecyl) disulphide, the percentages being based on the weight of copolymer. The resulting copolymer was spun and the filaments cross-linked.