ACRYLIC FLEXIBLE LIGHT PIPE HAVING IMPROVED OPTO-THERMAL STABILITY

摘要

PROBLEM TO BE SOLVED: To improve the opto-thermal stability of a flexible light pipe by incorporating a specific crosslinkable core mixture into this light pipe. SOLUTION: This light pipe contains the crosslinkable core mixture for a composite material to be cured in succession. The core. mixture has a thermoplastic core polymer contg. prescribed three polymn. unit, the residual molecules of a polymn. initiator or the decomposition products of this polymn. initiator, the residual molecules of a chain transfer agent or the decomposition products of this chain transfer agent. Simultaneously this core mixture is a combination of 0.1 to 10wt.% reactive additives and 0.01 to 1.0wt.% stabilizer/oxidation preventive agent and has a combination including 20 to 80wt.% hydrolysis stabilizable org. phosphite based on the weight of the combination described above and 80 to 20wt.% hindered phenol based on the weight of the combination. This phenol preferably exhibits the absorbance of <1 at a wavelength 400 in a 5% ethyl acetate soln. in a cell of 10cm.