Antifogging plastic lens material
AssigneeRexam Industries Corp.
InventorJoseph H. Evans
Life of this patent
Estimating the term…
Abstract
An antifogging plastic material is disclosed that is particularly suitable for use as a disposable fog-resistant lens. The lens material comprises a substantially transparent polyester substrate; a layer of polyvinylidene chloride-containing polymer on the polyester substrate; a water permeable colloid layer on the polyvinylidene chloride-containing layer; and a polyvinyl alcohol-containing layer on the water permeable colloid layer.
Claims8
A method of preparing an antifogging plastic lens material, said method comprising applying a layer of a polyvinyl alcohol containing-polymer in aqueous solution to the surface of a substrate comprised of a surface layer of a water permeable colloid, a layer of polyvinyl chloride-containing polymer beneath said water permeable colloid layer, and a polyester layer beneath said polyvinylidene chloride-containing layer;
- and
- drying the applied layer of polyvinyl alcohol-containing polymer on the said substrate.
A method of preparing an antifogging plastic material that is particularly suitable for use as a disposable fog-resistant lens, said method comprising:
- applying a layer of a polyvinylidene chloride-containing polymer by vapor deposition to a polyester substrate;
- applying a layer of a water permeable colloid to the polyvinylidene chloride-containing layer;
- and
- applying a layer of a polyvinyl alcohol-containing polymer to the water permeable colloid layer on the polyvinylidene chloride-containing layer.
Dependencies are inferred from the claim text.