| 摘要 |
1,148,244. Stabilizing polyamides. FARBENFABRIKEN BAYER A.G. 10 March, 1967 [12 March, 1966], No. 11332/67. Heading C3R. Polyamides are stabilized against the degradative effects of heat and oxygen by mixing them or their starting materials with 0À0001 to 0À2% by weight of a copper compound and a salt of hydrocyanic acid in such an amount that the molar ratio of CN to Cu is from 1 : 10 to 50 : 1. Specified copper compounds are the chlorides, bromides, iodide, cyanide, sulphate, acetate, stearate, benzoates, phenates, and complex compounds of these copper salts with ammonia, amines, amides, lactams, phosphites and phosphines. Specified cyanides are those of alkali metals, alkaline earth metals, Zn, Cd, Pb and Tl, also substituted or unsubstituted ammonium cyanides, K 2 Cd(CN) 4 and K 2 Zn(CN) 4 . The stabilizing effect can be increased by the addition of iodine, alkali metal or alkaline earth metal iodides, iodides of strong organic bases, polyiodides, aromatic iodine compounds, phosphites (e.g. tridecylphosphite), phosphines (e.g. tridocyl or triphenyl phosphine) or phosphorous acid. Examples 1 and 2 describe the addition of various stabilizers to polycaprolactam, possibly pigmented with cadmium sulphide and Example 3 describes the polymerization of a mixture of cuprolactam and a small amount of aminocaproic acid in the presence of various stabilizers. |
