Composite material with a high refractive index, process for producing said composite material and optically active material incorporating said composite material
AssigneeCommissariat a l'Energie Atomique
InventorsHerve Floch, Philippe Belleville
Life of this patent
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Abstract
The invention relates to a composite material having a high refractive index, its production process, as well as optically active materials such as antireflection materials and reflecting materials manufactured from the composite material. This composition material with a high refractive index is characterized in that it comprises SiO.sub.2 or metal oxide colloids (1), coated in a polyvinyl material (3), soluble in a water-containing alcoholic solvent.
Claims15
A composite material having a refractive index above about 1.6, comprising:
- a mineral phase composite consisting essentially of:
- (i) 60-99% of SiO.sub.2 or metal oxide colloid coated with,
- (ii) 1-40% of a crosslinked polyvinyl polymer,
- wherein said crosslinked polyvinyl polymer is selected from the group consisting of polyvinyl alcohols and polyvinyl pyrrolidones, and said crosslinked polyvinyl polymer, prior to crosslinking, is soluble in a solvent containing alcohol and water.
A composite material first coating having a refractive index above about 1.6, comprising:
- a mineral phase composite consisting essentially of:
- (i) 60-99% of metal oxide colloid selected from the group consisting of scandium oxide, yttrium oxide, lanthanum oxide, titanium oxide, zirconium oxide, hafnium oxide, thorium oxide, niobium oxide, tantalum oxide and aluminum oxide, coated with,
- (ii) 1-40% of a crosslinked polyvinyl polymer,
- wherein said crosslinked polyvinyl polymer is selected from the group consisting of polyvinyl alcohols and polyvinyl pyrrolidones, and said crosslinked polyvinyl polymer, prior to crosslinking, is soluble in a solvent containing alcohol and water.
An optically active material comprising an organic or inorganic substrate coated with at least a first coating of composite material having a refractive index above about 1.6, comprising:
- a mineral phase composite consisting essentially of:
- (i) 60-99% of SiO.sub.2 or metal oxide colloid coated with,
- (ii) 1-40% of a crosslinked polyvinyl polymer,
- wherein said crosslinked polyvinyl polymer is selected from the group consisting of polyvinyl alcohols and polyvinyl pyrrolidones, and said crosslinked polyvinyl polymer, prior to crosslinking, is soluble in a solvent containing alcohol and water.
Dependencies are inferred from the claim text.