| abstract |
A POLYOL IS REACTED WITH A DIIOSCYANATO TO PRODUCE A FIRST COMPOUND HAVING AVAILABLE FOR FURTHER REACTION UNREACTED ISOCYANATE GROUPS. THE FIRST COMPOUND IS CURED TO PRODUCE A POLYURETHANE COMPOUND HAVING IMPROVED LIGHT STABILITY. THE DIISOCYANATE USEFUL IN THIS INVENTION IS REPRESENTED BY THE FORMULA: OCH-R1-R2-R3-NCO WHEREIN THE -NCO GROUP ATTACHED TO R1 IS MORE REACTIVE THAN THE -NCO GROUP ATTACHED TO R3 AND T1 IS AN AROMATIC GROUP, R2 IS AN ALIPHATIC GROUP OR A DIRECT BOND, AND R3 IS A 1,4-CYCLOHEXYLENE GROUP. |