Antireflective coatings comprising a lubricating layer having a specific surface energy
First Claim
1. A durable body having antireflection properties comprisinga polymer substrate presenting a surface sought to be antireflected,a hardcoat layer formed on said surface to provide structural strength, the substrate having the hardcoat layer being sufficiently flexible to accommodate forming the substrate into a web,a multilayer antireflection coating on said hardcoat layer comprising at least two immediately adjacent pairs of layers, each layer of the antireflection coating having a thickness of less than 1500 angstroms, each such pair having, in order,a first layer of electrically conductive transparent inorganic material having an index of refraction of from 1.7 to 2.6 and a thickness of from about 50 to 1500 angstroms, the first layer being the closer layer to the polymer substrate within said pair of layers, anda second layer of transparent inorganic material having an index of refraction of from 1.29 to 1.7 and a thickness of from 50 to 1500 angstroms, witha lubricating layer having a surface energy not greater than 40 dynes/cm on a side of the multilayer antireflection coating opposite to the polymer substrate.
5 Assignments
0 Petitions
Accused Products
Abstract
An improved way to impart antireflection properties to light transmissive substrates and, at the same time, achieve a durable surface and electrical conductivity is disclosed. A stack of at least two sputter-deposited light transmissive inorganic layers, one of which being electrically conductive and having a high index of refraction with the one above it (relative to the substrate being antireflected) having a low index of refraction, in combination with a thin lubricating overlayer comprising a solvent-soluble lubricant such as a solvent-soluble fluoropolymer can achieve this desired combination of properties.
206 Citations
17 Claims
-
1. A durable body having antireflection properties comprising
a polymer substrate presenting a surface sought to be antireflected, a hardcoat layer formed on said surface to provide structural strength, the substrate having the hardcoat layer being sufficiently flexible to accommodate forming the substrate into a web, a multilayer antireflection coating on said hardcoat layer comprising at least two immediately adjacent pairs of layers, each layer of the antireflection coating having a thickness of less than 1500 angstroms, each such pair having, in order, a first layer of electrically conductive transparent inorganic material having an index of refraction of from 1.7 to 2.6 and a thickness of from about 50 to 1500 angstroms, the first layer being the closer layer to the polymer substrate within said pair of layers, and a second layer of transparent inorganic material having an index of refraction of from 1.29 to 1.7 and a thickness of from 50 to 1500 angstroms, with a lubricating layer having a surface energy not greater than 40 dynes/cm on a side of the multilayer antireflection coating opposite to the polymer substrate.
-
12. A light transmissive body having antireflection properties comprising
a light transmissive substrate presenting a surface sought to be antireflected a multilayer antireflection coating adherent to said surface, said antireflection coating comprising a first layer closer to the substrate comprising electrically conductive light transmissive sputter-deposited inorganic material having an index of refraction of from 1.7 to 2.6 and a thickness of from about 100 to 1500 angstroms, a second layer on said first layer opposite to the substrate, said second layer comprising sputter-deposited light transmissive inorganic material having an index of refraction of from 1.29 to 1.7 and a thickness of from 100 to 1500 angstroms, a third layer on the second layer opposite to the first layer, said third layer comprising electrically conductive light transmissive inorganic material having an index of refraction in the range of 1.7 to 2.6 and a thickness in the range of 500 to 1500 angstroms, a fourth layer on the third layer opposite to the second layer, said fourth layer comprising light transmissive inorganic material having an index of refraction in the range of 1.29 to 1.7 and a thickness in the range of 500 to 1500 angstroms, and a lubricating layer adhered to the antireflection coating on a side opposite to the substrate, said lubricating layer having a thickness of less than about 200 angstroms and a bulk surface energy of less than about 30 dynes/cm.
-
16. A light transmissive body having antireflection properties comprising
a web of a light transmissive substrate presenting a surface sought to be antireflected a multilayer antireflection coating adherent to said surface, said antireflection coating comprising a first layer closer to the substrate comprising light transmissive inorganic material having an index of refraction of from 1.7 to 2.6 and a thickness of from about 100 to 1500 angstroms, a second layer in contact with said first layer on a side opposite to the substrate, said second layer comprising light transmissive inorganic material having an index of refraction of from 1.29 to 1.7 and a thickness of from 100 to 1500 angstroms, a third layer in contact with the second layer on a side opposite to the first layer, said third layer comprising light transmissive inorganic material having an index of refraction in the range of 1.7 to 2.6 and a thickness in the range of 500 to 1500 angstroms, at least one of said first and third layers being electrically conductive, a fourth layer in contact with the third layer on a side opposite to the second layer, said fourth layer comprising light transmissive inorganic material having an index of refraction in the range of 1.29 to 1.7 and a thickness in the range of 500 to 1500 angstroms, and a lubricating layer adhered to the antireflection coating on a side opposite to the substrate, said lubricating layer having a thickness of less than about 200 angstroms and a bulk surface energy of less than about 30 dynes/cm.
-
17. A durable body having antireflection properties comprising
a polymer substrate presenting a surface sought to be antireflected, a hardcoat layer formed on said surface to provide structural strength, the substrate and hardcoat layer being formed into a web, a multilayer antireflection coating on said hardcoat layer comprising two or more immediately adjacent pairs of layers, each layer of the antireflection coating having a thickness of less than 1500 angstroms, each such pair having, in order, a first layer of transparent inorganic material having an index of refraction of from 1.7 to 2.6 and a thickness of from about 50 to 1500 angstroms, the first layer being the closer layer to the polymer substrate within said pair of layers, and a second layer of transparent inorganic material having an index of refraction of from 1.29 to 1.7 and a thickness of from 50 to 1500 angstroms, at least one of said first and second layers being electrically conductive, with a lubricating layer having a surface energy not greater than 40 dynes/cm on a side of the multilayer antireflection coating opposite to the polymer substrate.
Specification