Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating
Patent
1997-07-10
1998-09-08
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
264 28, B29D 1100
Patent
active
058041060
ABSTRACT:
The manufacturing process for UV-screening photochromism eye glasses is based on the use of polycarbonate, polymethyl methacrylate or Nylon as substrate to be mixed with spironaphthoxazine or its derivative as photochromism agent along with carrier, hindered phenol type antioxidant, silicone coupling agent, organic phosphorous stabilizer, piperidine type light stabilizer, and UV-absorbent. By mixing two of the last three ingredients and all other substances thuroughly, the mixture is frozen ground or mechanically pulverized to fine particles for injection molding to produce a long-term stable UV-screening photochromism eye glasses.
REFERENCES:
patent: 3716489 (1973-02-01), DeLapp
patent: 4968454 (1990-11-01), Crano et al.
Chen Cheng Tsu
Ho Yang Yeh
Shen Huang Lung
Yi Chiu Jen
Chen Cheng Tsu
Ho Yang Yeh
Vargot Mathieu D.
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