| 摘要 |
1490938 Stabilizing polyolefins CIBAGEIGY AG 18 Feb 1976 [20 Feb 1975 19 Sept 1975] 06460/76 Heading C3P Polyolefins may be stabilized with 0À005 to 5 weight per cent of mixtures of (1) a symmetrical triaryl phosphite of formula wherein R 1 is t-butyl, 1,1-dimethylpropyl, cyclohexyl or phenyl, and one of R 2 and R 3 is H and the other is H, methyl, t-butyl, 1,1-dimethylpropyl, cyclohexyl or phenyl, and (2) a phenolic antioxidant in a ratio of 10 : 1 to 1 : 5 and in the absence of a thiosynergist. The compositions may also comprise aromatic amines, hydroxyphenyl benzotriazoles and striazines, 2-hydroxybenzophenones, esters of optionally substituted benzoic acid, substituted acrylates, nickel complexes, oxalic aciddiamides, alkali metal and alkaline earth metal soaps, nucleating agents and other conventional additives. Examples describe the stabilizing of polyethylene and polypropylene with (1) tris (2,4-di-t-butylphenyl), tris(2-t-butyl-4-methylphenyl) and tris(2 - t. - butyl - 5 - methylphenyl)phosphites and (2) pentaerythritol tetra 3 - (3,5 - di - t. - butyl - 4 - hydroxyphenyl)- propionate, 1,1,3 - tris (5- t. - butyl - 4 - hydroxy- 2 - methylphenyl)butane, octadecyl 3 - (3,5- di - t. - butyl - 4 - hydroxyphenyl)propionate, 1,3,5 - tri - (3,5 - di - t. - butyl - 4 - hydroxybenzyl) - 2,4,6 - trimethylbenzene, 2,2<SP>1</SP>- methylene bis - (6 - t. - butyl - 4 - methylphenol), 4,41 - thio - bis - (6 - t. - butyl - 3 - methylphenol), 2,6 - di - t. butyl - 4 - methylphenol and 3,9 - bis[1,1 - dimethyl - 2 - (3,5 - di- - t.- butyl - 4 - hydroxyphenyl) - ethyl] - 2,4,8,10- tetraoxaspiro - [5,5]undecane. |
