Colored glass compositions and glazings produced therewith

Details Colored glass compositions and glazings produced therewith Colored glass compositions and glazings produced therewith

1996-09-27

2003-02-18

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S070000, C501S904000, C501S905000, C428S426000, C428S428000, C428S432000

Reissue Patent

active

RE037998

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to glass compositions used in the production of colored glazings, particularly for motor vehicle sunroofs.
BACKGROUND OF THE INVENTION
Now, more than ever before, automobile designers are incorporating into their designs glazings formed of colored glass which have both a functional purpose and an attractive appearance. This tendency is confirmed by the ever increasing glazed surface of new automobile models compared with older types.
As a result, the greenhouse effect is an important factor which must be taken into account in determining the air conditioning requirements for such automobiles. This is more particularly true in the case of cars equipped with glass sunroofs. In an attempt to reduce this greenhouse effect, numerous unsuccessful attempts have previously been made by those skilled in the art to produce colored glass compositions having the low light and energy transmission properties offered by the glasses of the present invention.
SUMMARY OF THE INVENTION
The present invention is directed to glass compositions which are highly colored, particularly grey-blue or green glasses, which are suitable for the applications described above. For a given thickness, these glasses have a very low total light transmission and total energy transmission.
According to the invention, these attributes are obtained with the use of a colored glass formulation comprising the following constituents in the weight proportions defined by the following limits:
SiO
2
64 to 75%
Al
2
O
3
0 to 5%
B
2
O
3
0 to 5%
CaO
 5 to 15%
MgO
0 to 5%
Na
2
O
10 to 18%
K
2
O
0 to 5%
wherein the total amount of the alkaline earth oxides ranges between 6 and 16% by weight and further wherein the total amount of alkali metal oxides is between 10 and 20% by weight. At least one of Al
2
O
3
, B
2
0
3
, MgO or K
2
O, each in an amount of up to 5% (0.05) by weight, therefore may be employed. The glass compositions of the invention also incorporate, as coloring agents:
Fe
2
O
3
(total iron)
1.4 to 4%   
CoO
  0 to 0.05%.
The amount of CoO is preferably greater than about 0.02% by weight when the amount of Fe
2
O
3
is less than about 2% by weight. Optionally, selenium and/or chromium oxide may also be added to the glass composition to provide additional coloration. The sum of CoO+selenium+Cr
2
O
3
is preferably no greater than 0.24. The glass of the invention has a total light transmission factor under illuminant A (i.e., designated as “TL
A
”) less than or equal to about 20% and a total energy transmission factor (i.e., “T
E
”) equal to or below approximately 12% at a “standard” glass thickness of 3.85 mm.


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