Dreikomponentengemische als Stabilisatoren fuer Polyalkylenoxyde

摘要

Polyalkylene oxides are stabilized by a mixture of the following compounds and (c) R4SnR5, where R1 is hydrogen, halogen, alkyl, aryl, aralkyl, cycloalkyl, alkoxy, aryloxy, acyloxy, nitro, amino, substituted amino, cyano, acyl, carboxylic or sulphonic acid ester or amide, or an alkyl or aryl sulphonic acid group, A is CH2 or S, R2, R3 are alkyl of 1 to 4 carbon atoms, n is 1 to 4, and R4, R5 are alkyl or -(CH2)mCOOR6, where R6 is alkyl and m is 1 to 4. Suitable polyalkylene oxides are those obtained by polymerizing saturated alkylene oxides, halo-substituted epoxides, e.g. epichlorohydrin, cycloaliphatic epoxides, or epoxy ethers, e.g. phenyl glycidyl ether, or by copolymerizing saturated epoxides with unsaturated epoxides, e.g. glycidyl acrylate. Suitable compounds (a) are the nickel salt of 1,2,3-benztriazole and the following substituted derivatives being the nickel salts of 6-methyl-, 6-chloro-, 6-methoxy-, 5-acetylamino-, 5-butyroylamino-, 6-stearoylamino- and 6-benzoylamino - 1,2,3 - benztriazoles. Typical compounds (b) are bis-(4-hydroxy-2-methyl-5-tert - butyl - phenyl) - methane, and bis - (4-hydroxy - 2,5 - di - t - butylphenyl) - sulphide. Typical compounds (e) are di-dodecyl) sulphide, di - (octadecyl) trisulphide and tetrasulphide (diacetic acid octadecyl ester). The stabilizer may be added as a solid or in solution. The stabilized polymers may be dissolved or caused to swell, and may be cross-linked. Swelling agents or solvents are: dimethyl formamide, tetramethylene sulphone, dioxane, methanol, aromatic hydrocarbons, 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 oxideallyl glycidyl ether copolymer, thiourea, silicic acid, zinc oxide, dipentamethylene thiuram tetrasulphide, 2 - mercaptobenzothiazole and titanium dioxide with a mixture of 2% of each of the following compounds: the nickel salts of 6-chloro-, 6-methoxy-, 6-stearoylamino- and 6-benzoylamino - 1,2,3 - benzotriazole, 0.5% of bis - (4 - hydroxy - 5 - t - butyl - 2 - methyl-phenyl)-sulphid and 0.5% of di-(octadecyl) disulphide, the percentages being based on the weight of copolymer. The resulting polymer was spun, and the filaments cross-linked.