Method of reducing the permeability of plastic optical articles

Details Method of reducing the permeability of plastic optical articles Method of reducing the permeability of plastic optical articles

1989-03-15

1991-05-07

Childs, Sadie

Coating processes

Optical element produced

427164, 4272553, 427307, 427322, B05D 506, C23C 1640

Patent

active

050135848

ABSTRACT:
A method for treating permeable plastics and other porous materials to provide solid barriers within the materials that reduce permeability. One method involves migrating a first gas reactant into the material and migrating a second reactant into the material wherein the first and second reactants react at a reaction interface to form a solid reaction product which provides reduced gas permeability for the material. Embodiments are disclosed in which gaseous reactants are migrated from opposite sides of the material to form an internal gas impermeable barrier. Embodiments are also disclosed where the reactants are sequentially migrated into the material to produce gas impermeable barriers. Swelling of the materials prior to treatment with reactants is also disclosed in order to maximize permeation and reactant migration.

REFERENCES:
patent: 3957559 (1976-05-01), Hoffman
patent: 4374163 (1983-02-01), Isenberg
patent: 4501777 (1985-02-01), Rose
patent: 4552786 (1985-11-01), Berneburg et al.
patent: 4609562 (1986-09-01), Isenberg et al.

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