Method of manufacturing a transparent polymer material article w

Details Method of manufacturing a transparent polymer material article w Method of manufacturing a transparent polymer material article w

1992-02-10

1993-11-02

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Composite or multiple layer

264162, 264 27, 264343, 351160H, 351175, B29D 1100

Patent

active

052581446

ABSTRACT:
In a method of manufacturing a transparent polymer material article having a refractive index gradient the polymer base material is caused to absorb a swelling agent including at least a monomer adapted to yield a polymer having a refractive index different than that of the polymer base material. A first preform having a first geometry is formed from the polymer base material sufficiently polymerized for the first preform to be self-supporting. A confinement space is defined between the first preform and an abutment member having facing it a second geometry at least partly different than the first geometry and having a greater volume than the latter. The first preform is brought into contact in the confinement space with a sufficient quantity of swelling agent for the swelling to which it is then subject to cause it to be urged actively into contact with all points of the second geometry. The resulting polymer material is polymerized and the second preform thus obtained is machined, if necessary, to the required final geometry of the required article. The method finds an application in the manufacture of ophthalmic lenses.

REFERENCES:
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patent: 3718383 (1973-02-01), Moore
patent: 3916033 (1975-10-01), Merrill
patent: 4153349 (1979-05-01), Wichterle
patent: 4208362 (1980-06-01), Deichert et al.
patent: 4978481 (1990-12-01), Janssen et al.
patent: 5075106 (1991-12-01), Goldenberg
Patent Abstracts of Japan vol. 10, No. 22 (P-424) Jan. 28, 1986 JP-A-60 175 009 (Nihon Ita Glass et Alia) Sep. 9, 1985.

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