CA1218840A - Light-storing glazes and light-storing fluorescent ceramic articles - Google Patents
Light-storing glazes and light-storing fluorescent ceramic articlesInfo
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- CA1218840A CA1218840A CA000455055A CA455055A CA1218840A CA 1218840 A CA1218840 A CA 1218840A CA 000455055 A CA000455055 A CA 000455055A CA 455055 A CA455055 A CA 455055A CA 1218840 A CA1218840 A CA 1218840A
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Abstract
LIGHT-STORING GLAZES AND LIGHT-STORING
FLUORESCENT CERAMIC ARTICLES
ABSTRACT OF THE DISCLOSURE:
A light-storing glaze comprising (a) a mixture of base components for a frit consisting of: per 100 parts by weight of the mixture (a), about 10 to about 50 parts by weight of B2O3, about 1 to about 20 parts by weight of Al2O3, 0 to about 10 parts by weight of ZnO, about 2 to about 15 parts by weight of Na2O, 0 to about 60 parts by weight of SiO2, 0 to about 15 parts by weight of CaO, 0 to about 5 parts by weight of K2O and 0 to about 5 parts by weight of MgO, and (b) about 20 to about 80 parts by weight of sulphide-type light-storing fluorescent material per 100 parts by weight of the mixture (a), and a light-storing fluorescent ceramic article having a surface coated with such glaze.
FLUORESCENT CERAMIC ARTICLES
ABSTRACT OF THE DISCLOSURE:
A light-storing glaze comprising (a) a mixture of base components for a frit consisting of: per 100 parts by weight of the mixture (a), about 10 to about 50 parts by weight of B2O3, about 1 to about 20 parts by weight of Al2O3, 0 to about 10 parts by weight of ZnO, about 2 to about 15 parts by weight of Na2O, 0 to about 60 parts by weight of SiO2, 0 to about 15 parts by weight of CaO, 0 to about 5 parts by weight of K2O and 0 to about 5 parts by weight of MgO, and (b) about 20 to about 80 parts by weight of sulphide-type light-storing fluorescent material per 100 parts by weight of the mixture (a), and a light-storing fluorescent ceramic article having a surface coated with such glaze.
Description
~2~8~4~
LIGHT-STORING GLAZES AND LIGHT-STORING
FLUORESCENT CERAMIC ARTICLES
_ This invention relates to light-storing fluorescent or light-storing luminescent ceramic articles and to glazes useful in glazing such ceramic articles.
Light-storing fluorescent materials are those - having a property of storing the radiant energy of visible ray, ultraviolet ray or the like and gradually giving it out in the dark to cause fluorescent or luminescent phenomenon (hereinafter referred to as "light-storing fluorescence"), and various kinds of materials are known to produce this phenomenon. Of the conventional materials having this property, sulphide-type light-storing fluorescent materials such as Ins, Cuds and the like are mainly used because they possess an outstanding luminescent property and ability to sustain afterglow or namely to prolong afterglow time (hereinafter referred to as "aferglow-sustaining ability"). In use, these sulphide-type light-storing fluorescent materials are mixed with polyvlnylchloride resin or like plastics material to produce a shaped product of plastics or coat the surface of a shaped product of plastics. Such sulphide-type materials have been used in manufacture of products intended for use in the dark or at nighttime EYE) such as specific signs, decorations, illuminators and so on, although the materials are poor in weather resistance, heat resistance, abrasion resistance and other properties.
While light-storing fluorescent materials have found use also in fields of fluorescent enamels, fluorescent -.
artificial stone and like products, they have failed to produce satisfactory results in these fields since the -I products obtained have- a fluorescence significantly reduced by oxidative decomposition of the sulfide during the baking of ceramic articles coated with the fluorescent material at a temperature of 740C or higher.
Bearing in mind the foregoing present situation, we have conducted extensive research in an attempt to produce ceramic articles having an improved light-storing fluorescence and found that when ceramic articles are glazed with a fruit of specific composition containing a sulphide-type light-storing fluorescent material, a layer serving to protect the sulphide-type light-storing fluorescent material is formed during the baking of the ceramic article even at a temperature of 740C or higher, whereby the ceramic article thus glazed exhibits a good luminescent property and afterglow-sustaining ability as well as remarkable weather resistance, heat resistance and abrasion resistance inherently possessed by ceramics.
Based on this novel finding, we have accomplished this invention.
1~:18~3~0 It is an object of the present invention to provide a novel light-storing glaze.
It is another object of the invention to provide (1) a light-storing glaze which enables the stable protection of the sulphide-type light-storing fluorescent material during the baking of the ceramic article at a high temperature (usually 740C or higher), eventually providing the ceramic article with surface coating excellent not only in weather resistance, heat resistance and abrasion resistance but also in luminescent property and afterglow-sustaining ability and (2) a light-storing fluorescent ceramic article produced by use of the glaze.
This invention provides (1) a light-storing glaze comprising (a) a mixture of : per 100 parts by weight of the mixture (a), about 10 to about 50 parts by weight of BYWAY, about 1 to about 20 parts by weight of AYE, 0 to about 10 parts by weight of Zoo, about 2 to about 15 parts by weight of NATO, 0 to about 60 parts by weight of Sue, 0 to about 15 parts by weight of Coo, 0 to about 5 parts by weight of KIWI and 0 to about 5 parts by weight of Moo, and tub) about 20 to about 80 parts by weight of sulphide-type light-storing fluorescent material per 100 parts by weight of the mixture (a), and (2) a light-storing fluorescent ceramic article having a surface 12~8840 coated with the glaze comprising (a) a mixture of : about 10 to about 50 parts by weight of B203, about 1 to about 20 parts by weight of Aye, 0 to about 10 parts by weight of Zen, about 2 to about 15 parts by weight of Noah, 0 to s 5 about 60 parts by weight of ion 0 to about 15 parts by - weight of Coo, O to about 5 parts by weight or K20 and O
to about 5 parts by weight of Moo, and (b) about 20 to : about 80 parts by weight of a sulphide-type light-storing fluorescent material per 100 parts by weight of the mixture (a).
A glaze or fruit for use in producing light-storing fluorescent ceramic articles must meet the following requirements.
(A) The fruit must not contain any component which forms a colored sulfide on reaction with the sulfide-type light-storing fluorescent material.
(B) During the baking of the ceramic article to form a glazed coat, the fruit must produce a vitreous layer for protecting the fluorescent material below a temperature at which the sulphide-type fluorescent material is oxidized to decompose.
(C) The fruit must achieve enclosure of the fluorescent material during the baking at high them-portrays to stabilize the material and to prevent the crystals of fluorescent material from breaking and ~2~L884() decomposing.
(D) The fruit must produce coating over the ceramic body by baking to exhibit a good weather ability, heat resistance and heat abrasion and other excellent properties.
I` (E) The fruit must produce coating having a remarkable luminescent property and afterglow-sustaining ability to an extent no less than the sulphide-type light-storing fluorescent material to which these pro-parties are attributable.
The fruit of the present invention can fulfill all of these requirements. For this purpose, however, it is necessary to control the amounts of the components per 100 parts by weight of the fruit as follows.
(i) The amount of BYWAY is about 10 to about 50 parts by weight. If the fruit contains less than 10 parts by weight of B203, it has a higher melting point which results in retarded formation of a protective layer for the sulphide-type fluorescent material and in failure to provide coating with afterglow-sustaining ability.
The fruit containing over 50 parts by weight of B203 has a higher volubility in water, and gives coating with reduced weather ability.
(ii) The amount of Aye is about 1 to about 20 parts by weight. If less than 1 part by weight of AYE is ~Z18840 present in the Fritz the flit flows downward over the ceramic surface on application because of its higher volubility in water and lower viscosity. The fruit con-tunneling more than about 20 parts by weight of AYE has a higher melting point and is difficult to vitrify in the ;
vicinity of a temperature at which the sulfide decomposes, consequently making it difficult to form a layer for -- protecting the sulphide-type fluorescent material.
(iii) The amount of Zoo is 0 to about 10 parts by weight. If over 10 parts by weight of Zoo is present, the fruits produces a coating with lower afterglow-sustaining ability and other surface defects due to its higher melting point and the ready decomposition of the sulfide.
(iv) The amount of NATO is about 2 to about 15 parts by weight. With less than 2 parts by weight of NATO
present, the glaze can not be adhered to the base surface of the ceramic article since it is difficult to flux at the specific temperature Sue and BYWAY which are the main components of the Fritz If over 15 parts by weight of NATO is present, the fruit possesses a sharply reduced melting point and is a glass which readily reacts with the sulphide-type fluorescent material. Such fruit readily decomposes and produces foam on the ceramic surface, failing to form a smooth surface. Further the fruit has a higher thermal expansion coefficient so that intrusion is likely to occur and coating with reduced weather resistance is formed.
(v) The amount of Sue is 60 parts or less by weight.
Above 60 parts by weight, the fruit has a higher softening point which is responsible for retarded formation of a protective layer for the fluorescent material and for coating lower in afterglow-sustaining ability. Further such fruit fails to provide a smooth and glossy surface coating on the ceramic article.
(vi) The amount of Coo is 15 parts or less by weight.
Above lo parts by weight, the fruit has a markedly low softening point and forms a glass which readily reacts with the sulfide, thereby decomposing the fluorescent material and failing to give afterglow-sustaining ability lo to the coating.
(vii) The amount of KIWI is 5 parts or less by weight.
Above 5 parts by weight, the fruit possesses a significantly high thermal expansion coefficient, which is apt to cause intrusion which reduces the mechanical strength of the glaze. Such fruit is also afforded a lower softening point, providing the glazed surface with lower afterglow-sustaining ability.
(viii) The amount of Moo is 5 parts or less by weight.
Above 5 parts by weight, the fruit displays a lower activity to stabilize the glaze, and is given a higher softening point, thereby favoring the decomposition of the sulfide and producing coating having reduced afterglow-sustaining ability.
It is well known that the properties of a fruit vary depending on the components and their amo~mts ..~
which are closely and complexly related to each other.
The statements (i) to (viii) made above are not always : sufficient to clarify the relationship between the components.
According to the present invention, the fruits incorporates 20 to 80 parts by weight of one or at least two species of sulphide-type light-storing fluorescent materials such as Ins, Cuds, Cast (ZnCd)S and the like per 100 parts by weight of the fruit components. Below less than 20 parts by weight, the glaze is less luminous and suffers a shorter afterglow time Above 80 parts by weight, a protective layer can not be formed in baking due to the high concentrations of Ins and like components, thereby failing to give a smooth-surfaced glaze coating.
According to the present invention, a light-storing fluorescent ceramic article is produced by the usual method as follows. A glaze slurry containing 100 parts by weight of base glaze components about 5 to about 300 em in particle size and 5 to 60 parts by weight of a sulphide-type light-storing fluorescent material 12~88~0 g about 5 to about 500 em in particle size is applied to a ceramic body and the coated ceramic body is baked at a temperature of about 650 to about 1100C. When required, conventional additives including a precipitation inhibitor, deflocculating agent, adhesive and the like can be added.
representative additives are water glass,dextrin, gum Arabic tragacanth gum, polyvinyl chloride, carboxymethyl cellulose, bentonite, acetic acid, etc.
A transparent glaze can be applied over a coating of the present glaze to produce a ceramic body having an improved weather resistance and abrasion resistance. The application of the transparent glaze can be conducted either after the baking of the ceramic body coated with the present glaze or on application of the present glaze, followed in either case by the baking of the ceramic body with the transparent glaze topcoat.
The composition of the transparent glaze is in the range of the base fruit composition.
Since the light-storing fluorescent ceramic articles of the present invention are capable of exhibiting afterglow for a prolonged period of time, they are very useful in manufacture of emergency guiding marks for use in the dark due to power failure, road signs for nighttime purpose, decorations, illuminators, materials for civil engineering works, building material, etc.
~2~8840 The present invention will be described below in more detail with reference to Examples and Comparison Example.
Examples 1 to 4 and Comparison Example 1 In each Example and in Comparison Example 1, ....
a glaze slurry was prepared by adding 30 parts by weight of Ins and 55 parts by weight of water to 70 parts by -: weight of a mixture of base fruit components as shown below in Table 1. The slurry was applied to one side of a sistered bare clay plate measuring 5 cm x 6 cm and the coated plate was heated to 800C in air over a 4 hour time period and maintained thereafter at the same them-portray for 30 minutes.
Table 2 below shows the degree of luminescent property and afterglow time.
Table 1 .
Glaze composition Exile Ex.2 Ex.3 Ex.4 Compel (wt.%) Sue 53.0 44.5 37.934.5 62.3 Aye 6.0 4.8 17.5 2.2 3.3 BYWAY 24.8 29.0 26.040.5 9.4 Coo 0.1 10.0 0.2 9.6 9.8 Moo - 0.3 2.0 0.1 2.4 Zoo 3.8 - - 0.5 KIWI 2.1 1.3 4.2 0.8 NATO 10.0 10.0 12.211.8 12.8 34~) X ¦ ¦ Jo U
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LIGHT-STORING GLAZES AND LIGHT-STORING
FLUORESCENT CERAMIC ARTICLES
_ This invention relates to light-storing fluorescent or light-storing luminescent ceramic articles and to glazes useful in glazing such ceramic articles.
Light-storing fluorescent materials are those - having a property of storing the radiant energy of visible ray, ultraviolet ray or the like and gradually giving it out in the dark to cause fluorescent or luminescent phenomenon (hereinafter referred to as "light-storing fluorescence"), and various kinds of materials are known to produce this phenomenon. Of the conventional materials having this property, sulphide-type light-storing fluorescent materials such as Ins, Cuds and the like are mainly used because they possess an outstanding luminescent property and ability to sustain afterglow or namely to prolong afterglow time (hereinafter referred to as "aferglow-sustaining ability"). In use, these sulphide-type light-storing fluorescent materials are mixed with polyvlnylchloride resin or like plastics material to produce a shaped product of plastics or coat the surface of a shaped product of plastics. Such sulphide-type materials have been used in manufacture of products intended for use in the dark or at nighttime EYE) such as specific signs, decorations, illuminators and so on, although the materials are poor in weather resistance, heat resistance, abrasion resistance and other properties.
While light-storing fluorescent materials have found use also in fields of fluorescent enamels, fluorescent -.
artificial stone and like products, they have failed to produce satisfactory results in these fields since the -I products obtained have- a fluorescence significantly reduced by oxidative decomposition of the sulfide during the baking of ceramic articles coated with the fluorescent material at a temperature of 740C or higher.
Bearing in mind the foregoing present situation, we have conducted extensive research in an attempt to produce ceramic articles having an improved light-storing fluorescence and found that when ceramic articles are glazed with a fruit of specific composition containing a sulphide-type light-storing fluorescent material, a layer serving to protect the sulphide-type light-storing fluorescent material is formed during the baking of the ceramic article even at a temperature of 740C or higher, whereby the ceramic article thus glazed exhibits a good luminescent property and afterglow-sustaining ability as well as remarkable weather resistance, heat resistance and abrasion resistance inherently possessed by ceramics.
Based on this novel finding, we have accomplished this invention.
1~:18~3~0 It is an object of the present invention to provide a novel light-storing glaze.
It is another object of the invention to provide (1) a light-storing glaze which enables the stable protection of the sulphide-type light-storing fluorescent material during the baking of the ceramic article at a high temperature (usually 740C or higher), eventually providing the ceramic article with surface coating excellent not only in weather resistance, heat resistance and abrasion resistance but also in luminescent property and afterglow-sustaining ability and (2) a light-storing fluorescent ceramic article produced by use of the glaze.
This invention provides (1) a light-storing glaze comprising (a) a mixture of : per 100 parts by weight of the mixture (a), about 10 to about 50 parts by weight of BYWAY, about 1 to about 20 parts by weight of AYE, 0 to about 10 parts by weight of Zoo, about 2 to about 15 parts by weight of NATO, 0 to about 60 parts by weight of Sue, 0 to about 15 parts by weight of Coo, 0 to about 5 parts by weight of KIWI and 0 to about 5 parts by weight of Moo, and tub) about 20 to about 80 parts by weight of sulphide-type light-storing fluorescent material per 100 parts by weight of the mixture (a), and (2) a light-storing fluorescent ceramic article having a surface 12~8840 coated with the glaze comprising (a) a mixture of : about 10 to about 50 parts by weight of B203, about 1 to about 20 parts by weight of Aye, 0 to about 10 parts by weight of Zen, about 2 to about 15 parts by weight of Noah, 0 to s 5 about 60 parts by weight of ion 0 to about 15 parts by - weight of Coo, O to about 5 parts by weight or K20 and O
to about 5 parts by weight of Moo, and (b) about 20 to : about 80 parts by weight of a sulphide-type light-storing fluorescent material per 100 parts by weight of the mixture (a).
A glaze or fruit for use in producing light-storing fluorescent ceramic articles must meet the following requirements.
(A) The fruit must not contain any component which forms a colored sulfide on reaction with the sulfide-type light-storing fluorescent material.
(B) During the baking of the ceramic article to form a glazed coat, the fruit must produce a vitreous layer for protecting the fluorescent material below a temperature at which the sulphide-type fluorescent material is oxidized to decompose.
(C) The fruit must achieve enclosure of the fluorescent material during the baking at high them-portrays to stabilize the material and to prevent the crystals of fluorescent material from breaking and ~2~L884() decomposing.
(D) The fruit must produce coating over the ceramic body by baking to exhibit a good weather ability, heat resistance and heat abrasion and other excellent properties.
I` (E) The fruit must produce coating having a remarkable luminescent property and afterglow-sustaining ability to an extent no less than the sulphide-type light-storing fluorescent material to which these pro-parties are attributable.
The fruit of the present invention can fulfill all of these requirements. For this purpose, however, it is necessary to control the amounts of the components per 100 parts by weight of the fruit as follows.
(i) The amount of BYWAY is about 10 to about 50 parts by weight. If the fruit contains less than 10 parts by weight of B203, it has a higher melting point which results in retarded formation of a protective layer for the sulphide-type fluorescent material and in failure to provide coating with afterglow-sustaining ability.
The fruit containing over 50 parts by weight of B203 has a higher volubility in water, and gives coating with reduced weather ability.
(ii) The amount of Aye is about 1 to about 20 parts by weight. If less than 1 part by weight of AYE is ~Z18840 present in the Fritz the flit flows downward over the ceramic surface on application because of its higher volubility in water and lower viscosity. The fruit con-tunneling more than about 20 parts by weight of AYE has a higher melting point and is difficult to vitrify in the ;
vicinity of a temperature at which the sulfide decomposes, consequently making it difficult to form a layer for -- protecting the sulphide-type fluorescent material.
(iii) The amount of Zoo is 0 to about 10 parts by weight. If over 10 parts by weight of Zoo is present, the fruits produces a coating with lower afterglow-sustaining ability and other surface defects due to its higher melting point and the ready decomposition of the sulfide.
(iv) The amount of NATO is about 2 to about 15 parts by weight. With less than 2 parts by weight of NATO
present, the glaze can not be adhered to the base surface of the ceramic article since it is difficult to flux at the specific temperature Sue and BYWAY which are the main components of the Fritz If over 15 parts by weight of NATO is present, the fruit possesses a sharply reduced melting point and is a glass which readily reacts with the sulphide-type fluorescent material. Such fruit readily decomposes and produces foam on the ceramic surface, failing to form a smooth surface. Further the fruit has a higher thermal expansion coefficient so that intrusion is likely to occur and coating with reduced weather resistance is formed.
(v) The amount of Sue is 60 parts or less by weight.
Above 60 parts by weight, the fruit has a higher softening point which is responsible for retarded formation of a protective layer for the fluorescent material and for coating lower in afterglow-sustaining ability. Further such fruit fails to provide a smooth and glossy surface coating on the ceramic article.
(vi) The amount of Coo is 15 parts or less by weight.
Above lo parts by weight, the fruit has a markedly low softening point and forms a glass which readily reacts with the sulfide, thereby decomposing the fluorescent material and failing to give afterglow-sustaining ability lo to the coating.
(vii) The amount of KIWI is 5 parts or less by weight.
Above 5 parts by weight, the fruit possesses a significantly high thermal expansion coefficient, which is apt to cause intrusion which reduces the mechanical strength of the glaze. Such fruit is also afforded a lower softening point, providing the glazed surface with lower afterglow-sustaining ability.
(viii) The amount of Moo is 5 parts or less by weight.
Above 5 parts by weight, the fruit displays a lower activity to stabilize the glaze, and is given a higher softening point, thereby favoring the decomposition of the sulfide and producing coating having reduced afterglow-sustaining ability.
It is well known that the properties of a fruit vary depending on the components and their amo~mts ..~
which are closely and complexly related to each other.
The statements (i) to (viii) made above are not always : sufficient to clarify the relationship between the components.
According to the present invention, the fruits incorporates 20 to 80 parts by weight of one or at least two species of sulphide-type light-storing fluorescent materials such as Ins, Cuds, Cast (ZnCd)S and the like per 100 parts by weight of the fruit components. Below less than 20 parts by weight, the glaze is less luminous and suffers a shorter afterglow time Above 80 parts by weight, a protective layer can not be formed in baking due to the high concentrations of Ins and like components, thereby failing to give a smooth-surfaced glaze coating.
According to the present invention, a light-storing fluorescent ceramic article is produced by the usual method as follows. A glaze slurry containing 100 parts by weight of base glaze components about 5 to about 300 em in particle size and 5 to 60 parts by weight of a sulphide-type light-storing fluorescent material 12~88~0 g about 5 to about 500 em in particle size is applied to a ceramic body and the coated ceramic body is baked at a temperature of about 650 to about 1100C. When required, conventional additives including a precipitation inhibitor, deflocculating agent, adhesive and the like can be added.
representative additives are water glass,dextrin, gum Arabic tragacanth gum, polyvinyl chloride, carboxymethyl cellulose, bentonite, acetic acid, etc.
A transparent glaze can be applied over a coating of the present glaze to produce a ceramic body having an improved weather resistance and abrasion resistance. The application of the transparent glaze can be conducted either after the baking of the ceramic body coated with the present glaze or on application of the present glaze, followed in either case by the baking of the ceramic body with the transparent glaze topcoat.
The composition of the transparent glaze is in the range of the base fruit composition.
Since the light-storing fluorescent ceramic articles of the present invention are capable of exhibiting afterglow for a prolonged period of time, they are very useful in manufacture of emergency guiding marks for use in the dark due to power failure, road signs for nighttime purpose, decorations, illuminators, materials for civil engineering works, building material, etc.
~2~8840 The present invention will be described below in more detail with reference to Examples and Comparison Example.
Examples 1 to 4 and Comparison Example 1 In each Example and in Comparison Example 1, ....
a glaze slurry was prepared by adding 30 parts by weight of Ins and 55 parts by weight of water to 70 parts by -: weight of a mixture of base fruit components as shown below in Table 1. The slurry was applied to one side of a sistered bare clay plate measuring 5 cm x 6 cm and the coated plate was heated to 800C in air over a 4 hour time period and maintained thereafter at the same them-portray for 30 minutes.
Table 2 below shows the degree of luminescent property and afterglow time.
Table 1 .
Glaze composition Exile Ex.2 Ex.3 Ex.4 Compel (wt.%) Sue 53.0 44.5 37.934.5 62.3 Aye 6.0 4.8 17.5 2.2 3.3 BYWAY 24.8 29.0 26.040.5 9.4 Coo 0.1 10.0 0.2 9.6 9.8 Moo - 0.3 2.0 0.1 2.4 Zoo 3.8 - - 0.5 KIWI 2.1 1.3 4.2 0.8 NATO 10.0 10.0 12.211.8 12.8 34~) X ¦ ¦ Jo U
Lo C I
Jo C I
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I c ye .~~, O I on in Jo o Awl 3 mu o I O us e a O
X I o o I .,1 Jo I
C
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Jo . . O
c _ ala x O e a e .,, Us O
I C C
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P o cay c e us us P
Ed x O O by e c En e O O
- C
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O CCq X o o Jo a.) us e O O
I O O
4_) En n I
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O e cq O
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C I
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Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A light storing glaze comprising (a) a mixture of base components for a frit consisting of:
per 100 parts by weight of the mixture (a), about 10 to about 50 parts by weight of B2O3, about 1 to about 20 parts by weight of Al2O3, 0 to about 10 parts by weight of ZnO, about 2 to about 15 parts by weight of Na2O, 0 to about 60 parts by weight of SiO2, 0 to about 15 parts by weight of CaO, 0 to about 5 parts by weight of K2O and 0 to about 5 parts by weight of MgO, and (b) about 20 to about 80 parts by weight of sulphide-type light-storing fluorescent material per 100 parts by weight of the mixture (a).
per 100 parts by weight of the mixture (a), about 10 to about 50 parts by weight of B2O3, about 1 to about 20 parts by weight of Al2O3, 0 to about 10 parts by weight of ZnO, about 2 to about 15 parts by weight of Na2O, 0 to about 60 parts by weight of SiO2, 0 to about 15 parts by weight of CaO, 0 to about 5 parts by weight of K2O and 0 to about 5 parts by weight of MgO, and (b) about 20 to about 80 parts by weight of sulphide-type light-storing fluorescent material per 100 parts by weight of the mixture (a).
2. A light-storing glaze as defined in claim 1 in which the mixture (a) of base frit components consists of : per 100 parts by weight of the mixture, about 20 to about 40 parts by weight of B2O3, about 2 to about 20 parts by weight of Al2O3, 0 to about 5 parts by weight of Zn, about 10 to about 15 parts by weight of Na2O, 0 to about 5 parts by weight of K2O, 0 to about 10 parts by weight of CaO and 0 to about 2 parts by weight of MgO.
3. A light-storing glaze as defined in claim 1 in which the mixture (a) of base frit components consists of : per 100 parts by weight of the mixture (a), about 25 to about 30 parts by weight of B2O3, about 5 to about 10 parts by weight of Al203, 0 to about 4 parts by weight of ZnO, about 10 to about 12 parts by weight of Na2O, about 1 to about 2 parts by weight of K2O, about 0.1 to about 10 parts by weight of CaO and 0 to about 0.5 part by weight of MgO.
4. A light-storing glaze as defined in claim l which contains about 25 to about 35 parts by weight of the sulphide-type light-storing fluorescent material per 100 parts by weight of the mixture (a) of base frit components.
5. A light-storing fluorescent material as defined in claim l in which the sulphide-type light-storing fluorescent material is at least one member selected from ZnS, CdS, CaS and (ZnCd)S.
6. A light-storing fluorescent material as defined in claim 5 in which the sulphide-type fluorescent material is ZnS.
7. A light-storing fluorescent ceramic article having a surface coated with a glaze comprising (a) a mixture of base frit components consisting of : per 100 parts by weight of the mixture (a), about 10 to about 50 parts by weight of B2O3, about 1 to about 20 parts by weight of Al203, 0 to about 10 parts by weight of ZnO, about 2 to about 15 parts by weight of Na2O, 0 to about 60 parts by weight of SiO2, 0 to about 15 parts by weight of CaO, 0 to about 5 parts by weight of K2O and 0 to about 5 parts by weight of MgO, and (b) about 20 to about 80 parts by weight of sulphide-type light-storing fluorescent material per 100 parts by weight of the mixture (a).
8. A light-storing fluorescent ceramic article as defined in claim 1 in which a transparent glaze is applied to the surface coated with the light-storing fluorescent glaze.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000455055A CA1218840A (en) | 1984-05-24 | 1984-05-24 | Light-storing glazes and light-storing fluorescent ceramic articles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000455055A CA1218840A (en) | 1984-05-24 | 1984-05-24 | Light-storing glazes and light-storing fluorescent ceramic articles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1218840A true CA1218840A (en) | 1987-03-10 |
Family
ID=4127929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000455055A Expired CA1218840A (en) | 1984-05-24 | 1984-05-24 | Light-storing glazes and light-storing fluorescent ceramic articles |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1218840A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005028399A1 (en) * | 2003-09-22 | 2005-03-31 | Gruppo Ceramiche Saicis S.P.A. | Method for manufacturing ceramic articles with luminescent properties, and articles obtained thereby |
-
1984
- 1984-05-24 CA CA000455055A patent/CA1218840A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005028399A1 (en) * | 2003-09-22 | 2005-03-31 | Gruppo Ceramiche Saicis S.P.A. | Method for manufacturing ceramic articles with luminescent properties, and articles obtained thereby |
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