| abstract |
An optical transmitter of polyvinyl chloride resin composition excelling in transparency and being acceptable as an optical resin material. There is provided an optical transmitter of resin composition (1) containing a polyvinyl chloride resin as a main component and exhibiting a calorie of endothermic peak existing at 110° to 210°C of 0 to 4.0 mJ/mg, or (2) composed mainly of a polyvinyl chloride resin of 62 to 73% chlorine content, or (3) containing a polyvinyl chloride resin as a main component and containing a substance of 7.0 to 12.0 (cal/cm3)1/2 solubility parameter in an amount of less than 50 wt.%. |