Optical resin materials with distributed refractive index

Details Optical resin materials with distributed refractive index Optical resin materials with distributed refractive index

1995-06-07

1998-06-16

Smith, Jeffrey T.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525277, 525306, 525932, 264 11, 264 124, 264 129, 385124, 385141, C08F26504

Patent

active

057672008

ABSTRACT:
An optical resin, of which the refractive index continuously changes in a specific direction, is produced by filling a polymerization container with a mixed solution containing at least one type of polymerizable monomer or polymerizable monomer sol and at least one type of substance whose solubility parameter differs by 7 (cal/cm.sup.3).sup.1/2 or less and refractive index by 0.001 or more from those of a polymer produced by polymerization of the monomer, and by subjecting the mixture to polymerization reaction by applying heat or energy rays to the container from outside so that the polymerization reaction starts and progresses preferentially from a particular region of the mixture, thus forming a concentration gradient of the substance having different refractive index.
The polymerization container may be made of a polymer which swells and dissolves into the mixed solution from an inner wall thereof.
After completing the polymerization reaction, the optical resin is subjected to hot drawing to obtain an optical conductor. Further, post-treatment based on crosslinking reaction is applied to improve heat resistance.

REFERENCES:
patent: 3718383 (1973-02-01), Moore
patent: 3816160 (1974-06-01), Moore
patent: 3955015 (1976-05-01), Ohtsuka et al.
patent: 4521351 (1985-06-01), Ohtsuka et al.
patent: 5541247 (1996-07-01), Koike

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