| 摘要 |
PURPOSE: A radical scavenger with improved thermal stability and polyurethanes modified by the radical scavenger are provided to improve thermal stability of polyurethanes by adding a binary radical scavenger and to improve yellowing resistance. CONSTITUTION: A radical scavenger improving thermal stability by being molten in a polyurethane resin is at least two kinds selected from the group consisting of 1, 3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene, pentaerythrityl-tetrakis[3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, tri (3, 5 di-tert-butyl-4-hydroxybenzyl)isocyanuric acid, and octadecyl-3-(3, 5-di-t-butyl-4-hydroxyphenyl) propionate. |
