Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Composite or multiple layer
Patent
1993-08-23
1995-02-21
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Composite or multiple layer
156228, 264 27, 264325, 359241, 359885, B29D 1100
Patent
active
053913299
ABSTRACT:
An improved process is provided for making optical limiters having a graded axial distribution of a reverse saturable absorber compound, such as a buckminsterfullerene, in a host matrix, such as polymethyl methacrylate or polycarbonate. The process of the invention includes: (a) dissolving the reverse saturable absorber and the host matrix in a suitable solvent to form a solution having a preselected ratio of reverse saturable absorber to host matrix; (b) casting the solution onto a surface to form a film; (c) evaporating the solvent to form a free-standing film; (d) performing steps (a)-(c) for each different desired ratio of reverse saturable absorber to host matrix; (e) stacking the free-standing films in a desired order; and (f) hot-pressing the stack to form the optical limiter having a graded distribution of the reverse saturable absorber in the host matrix. If desired, the stack of films can be placed in a die for hot-pressing. The films can be pre-cut to the shape of the die.
REFERENCES:
patent: 3582424 (1971-06-01), Norvaisa
patent: 4360483 (1982-11-01), Ayres
patent: 4659407 (1987-04-01), Lacotte et al.
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Dougherty Thomas K.
Elias William E.
Klein Marvin B.
Kost Alan R.
Denson-Low W. K.
Hughes Aircraft Company
Lachman M. E.
Sales M. W.
Vargot Mathieu D.
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