| 摘要 |
PURPOSE:To obtain the titled resin excellent in resistance to light, weather, heat, water and oxidation and retention of whiteness, by reacting an isocyanate compound with an active hydrogen-containing compound in the presence of a specified stabilizer for polyurethane. CONSTITUTION:A stabilizer for polyurethane is obtained by mixing 0.05-5wt%, based on polyurethane, ultraviolet absorber [e.g., 2-(2'-hydroxy-5'-methylphenyl) benzotriazole] with an antioxidant comprising a hindered phenol compound having at least one branched lower aliphatic hydrocarbon group in a position ortho to the OH (e.g., a compound of formula I) and 0.05-5wt% phosphite of a P content of 6.0-8.0wt%, of formula II [wherein R1-3 are each (cyclo)alkyl, (alkyl)aryl or aralkyl]. A polyisocyanate compound component such as toluene diisocyanate is reacted with an active hydrogen-containing compound (e.g., ethylene glycol) in the presence of said stabilizer and, optionally, a reaction catalyst.
|
