Mirror and method of manufacturing same
First Claim
1. A mirror, comprising:
- a glass sheet which is transparent;
a reflective metal coating deposited on at least one surface of the glass sheet; and
a protective coating applied to the reflective metal coating and comprising a paint which has a glass transition temperature of less than 35°
C. and which has a residual internal stress SR equal to or less than 1 MPa when measured by a Cantilever method as defined herein 20°
C. or at at a temperature which is 5°
C. above its glass transition temperature whichever is higher, at which temperature a curve of internal stress as a function of temperature becomes substantially parallel to the temperature axis whereby said mirror shows a means marginal corrosion of no more than about 1.0 mm when subjected to a saline mist test as described herein.
1 Assignment
0 Petitions
Accused Products
Abstract
A mirror comprises a transparent glass sheet having a reflective metal coating deposited on the glass and a protective coating applied to the reflective coating. The protective coating comprises a paint having a residual internal stress SR equal to or less than 1 MPa, measured by the Cantilever method (as defined) at a temperature above its glass transition temperature. One suitable paint used in coating the mirror has the following composition:
50% pigments:
10% titanium dioxide
45% barium sulphate
25% talc
15% lead pigment
5% coloring pigment and carbon black
15% binder
100% epoxy resin ester with 45% castor oil
35% solvents
5% butanol and isobutanol
95% xylene.
The glass transition temperature of the paint is approximately 10° C., the residual internal stress at 20° C. is approximately 0.05 MPa and the Persoz hardness is approximately 120.
13 Citations
21 Claims
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1. A mirror, comprising:
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a glass sheet which is transparent; a reflective metal coating deposited on at least one surface of the glass sheet; and a protective coating applied to the reflective metal coating and comprising a paint which has a glass transition temperature of less than 35°
C. and which has a residual internal stress SR equal to or less than 1 MPa when measured by a Cantilever method as defined herein 20°
C. or at at a temperature which is 5°
C. above its glass transition temperature whichever is higher, at which temperature a curve of internal stress as a function of temperature becomes substantially parallel to the temperature axis whereby said mirror shows a means marginal corrosion of no more than about 1.0 mm when subjected to a saline mist test as described herein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of manufacturing a mirror comprising:
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depositing a reflective metal coating on a glass sheet; and applying a protective coating to the reflective metal coating which is comprised of a paint having a glass transition temperatur eof less than 35°
C., and having a residual internal stress SR equal to or less than 1 MPa when measured by a Cantilever method as defined ehrein at 20°
C. or at a temperature which is 5°
C. above its glass transition temperature whichever is higher, at which temperature a curve of internal stress as a function of temperature becomes substantially parallel to the temperature axis whereby a mirror thus produced shows a mean marginal corrosion of no more than about 1.0 mm when subjected to a saline mist test as described herein. - View Dependent Claims (19, 20, 21)
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Specification