| 简介 |
PROBLEM TO BE SOLVED : To provide resin made components of glasses which contain a minus ion (negative ion) radiative substance safe to the human body and having a mean grain size at which the substance can be smoothly mixed with synthetic resins.
SOLUTION : A rare earth ore #515 made into the form of particulate below 0.1 μ in the mean grain size is employed for the minus ion (negative ion) radiative substance included in the resin made components of glasses. In addition, the mixing ratio of the rare earth ore with the synthetic resins is set to be 0.1 to 1.0wt% when converted to the content of thorium. |
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