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Optical Coating Composition

a technology of optical coating and composition, applied in the direction of synthetic resin layered products, coatings, transportation and packaging, etc., can solve the problems of eyeglass lens dullness, hazy, relatively soft, scratching,

Inactive Publication Date: 2008-12-18
THE WALMAN OPTICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Transparent plastic materials such as eyeglass lenses are subject to becoming dull and hazy due to scratching and abrasion during use.
Polycarbonate eyeglass lenses, for example, are strong and shatter resistant but also are relatively soft and susceptible to scratching.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

working examples 1-10

INGREDIENTS KEY (product name, chemical description, source):

[0086]

A187Glycidoxy propyl trimethoxy silane (GE Silicones)A186Epoxy Cyclohexyl Trimethoxy Silane (GE Silicones)A 1630Methyl trimethoxy silane (Crompton Corp)SR 9209alkoxylated aliphatic diacrylate (Sartomer, Inc.)SR 444pentaerythritol triacrylate (Sartomer, Inc.)SR-351trimethylolpropane triacrylate (TMPTA, Sartomer,Inc.)SR-2381,6 hexanediol diacrylate (HDODA, Sartomer, Inc.)DEAP2,2-diethoxy acetophenone, free radical initiator(First Chemical Corporation)Cyracure 6974Cationic photoiniator (Dow Chemical)Irgacure 184Free radical photoiniator (Ciba Geigy)Irgacure 250Cationic photoiniator (Ciba Geigy)Uvacure 1502Cycloaliphatic epoxy resin (UCB Chemicals Corp)Cyracure UVR3-Ethyl-3-(hydroxymethyl)oxetane (Dow Chemical)6000OXT-221bis[1-ethyl(3-oxetanyl)]methyl ether (Toagosei,Ltd)BYK 307Silicone type flow control agent (BYK - Chemie)MA-ST30% Colloidal silica in methyl alcohol (NissanChemical)VectomerVinyl ether (Morton Chemical)H...

example 1

Preparation of Base Resin (Epoxy Functional Inorganic / Organic Hybrid)

[0087]The following ingredients were mixed with stirring for either 2 hours at 50-60 C or for 18-20 hrs at room temperature in a flask equipped with a condenser, after which volatiles were removed under reduced pressure to provide a stripped, hydrolyzed silane component as “Resin A”.

Resin AIngredientAmount (g)Non-hydrolyzed silane1000(A187)H2014110% HCl5.4

[0088]A second composition (Resin B) was prepared to provide silane treated colloidal silica, by mixing colloidal silica and silane in a flask fitted with a condenser for 18-20 hrs at room temperature. The ingredients were reacted under conditions suitable to hydrolyze silane groups to form corresponding silanol groups, thereby forming a covalent inorganic / organic hybrid SiO2:

Resin BIngredientAmount (g)Colloidal silica605(MA-ST)Silane coupling agent18.2(A1630)H204.8

[0089]Resin A and additional silane were added to the above-described preparation of Resin B in the ...

example 2

Base Resin without Added Monomer

[0092]The Base Resin of Example 1 was mixed as follows:

Base resin20.0gCationic photoiniator (Cyracure 6974)1.2gFlow control agent (BYK 307)0.05g

[0093]Polycarbonate lens stock was provided with a conventional acrylic primer layer (see, e.g., Example 2, PCT / US97 / 07852, WO 97 / 45498), and the mixture was spin coated onto the primed polycarbonate lenses and cured in one pass through a UV Cure unit using a medium pressure mercury H bulb. Total exposure was 1.4 Joules.

[0094]The coating thickness was 4-5 microns, and had excellent adhesion according to ASTM D3359-02 (Standard Test Methods for Measuring Adhesion by Tape Test), using 3M 600 tape 1″ wide, when tested both prior to and after soaking for 15 minutes in a dye bath at 95-100 C, using black dye (available from Brain Power, Inc. (“BPI”), Miami, Fla.). The coating was also spin coated onto a primed polycarbonate panel and tested for abrasion resistance according to ASTM D1044-99 (Standard Test Method fo...

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Abstract

Coating compositions yielding cured coatings that exhibit excellent abrasion-resistance and hardness for use on polymeric substrates such as the front side of optical lenses, in a manner that meets or exceeds the stringent requirements for such use. The compositions include a monomeric organofunctional silane, and colloidal silica present in an amount sufficient to improve abrasion resistance as compared to a composition lacking the colloidal silica.

Description

TECHNICAL FIELD[0001]In one aspect, this invention relates to the field of coatings for transparent objects such as eyeglass lenses, and refers particularly to coating compositions having low viscosities and to coating compositions producing highly abrasion resistant coatings. In another aspect, the invention relates to abrasion resistant coatings for a wide variety of substrates.BACKGROUND OF THE INVENTION[0002]Transparent plastic materials such as eyeglass lenses are subject to becoming dull and hazy due to scratching and abrasion during use. Polycarbonate eyeglass lenses, for example, are strong and shatter resistant but also are relatively soft and susceptible to scratching. Television screen face plates similarly are made of flexible, shatter resistant plastic materials such as polycarbonate and poly (methylmethacrylate), and these also can be scratched or abraded.[0003]Various coatings have been proposed for eyeglasses and other transparent plastic materials to reduce their pr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B27/08B05D3/00C09D5/00
CPCC08G59/306C08G59/3254C08K3/36C09D163/00C09D183/06C08L2666/54C08K5/5435Y10T428/31507Y10T428/31663
Inventor TREADWAY, GERALD D.
Owner THE WALMAN OPTICAL