Photochromic plastic materials

Details Photochromic plastic materials Photochromic plastic materials

1976-06-11

1977-09-20

Hoffman, James R.

Coating processes

Optical element produced

Transparent base

96 90PC, 350160P, 428913, G02F 101, G02B 110, G02B 112, B05D 506

Patent

active

040498468

ABSTRACT:
A method for producing photochromic plastic materials is disclosed which is characterized by forming a transparent polymeric shape from a mixed polymer consisting of a polyester resin made by esterification of an unsaturated polybasic organic acid with a polyhydric alcohol, and a polar vinyl monomer, swelling a surface layer of the cured polymeric shape with a polar solvent, absorbing silver and halide ions into the swelled surface layer, and collapsing the swelled surface layer.

REFERENCES:
patent: 3208860 (1965-09-01), Armistead et al.
patent: 3419370 (1968-12-01), Cramer et al.
patent: 3779775 (1973-12-01), Chiba et al.
patent: 3950591 (1976-04-01), Gliemeroth et al.

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