Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
1999-04-27
2001-12-25
Nakarani, D. S. (Department: 1773)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S266000, C524S394000, C524S398000, C524S399000
Reexamination Certificate
active
06333371
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a coloring coating composition, which facilitates a recycle of colored glass products and is used for forming a colored glass gel thin film on a glass surface, a process for the production thereof and use thereof. More specifically, it relates to a coating composition for coloring a glass, which can recycle a colored glass product as a colorless glass by making the colored glass product colorless at a re-melting time, a process for the production thereof and use thereof.
PRIOR ART OF THE INVENTION
Recently, it is highly demanded to recycle resources in view of the preservation of resources and environmental conservation.
Glass is mainly formed of silicon dioxide which exists in abundance on the earth and can be reused by recovering and re-melting it as a cullet, so that it is a superior material in view of the conservation of resources and recycling. However, glass products include colorless products and colored products. Various transition metals are used for coloring, so that it is difficult to return colored products to colorless glass by re-melting. Therefore, when colorless glass products and colored glass products are recovered together, it is difficult to carry out a recycling treatment at a time. Therefore, it is required to recover the colorless glass products and the colored glass products separately. As a result, the recycling rate thereof remains at a low rate.
Thereat, as a method of converting a colored glass to a colorless glass at a re-melting time, there is proposed a method of coating a glass with a colored glass gel thin film by using a sol-gel method, that is, a method of forming a colored glass gel thin film on a glass by coating the glass with a metal alkoxide solution containing an organic coloring matter and calcinating the coated glass at a low temperature.
For example, JP-A-1-320742 proposes a method of applying a metal alkoxide solution containing an organic dye onto a glass and calcinating the coated glass, to form a glass gel thin film. However, in point of the decomposition temperature of the organic dye, calcination must be carried out at 300° C. or less. The so-obtained glass thin film has extremely many pores and it is a porous film. As a result, there is caused a problem of water-resistance, that is, a problem in that coloring matter is eluted by the ingression of water or agents from the pores. Further, since the glass gel thin film permits the transmission of oxygen or the like, resistance to ultraviolet is poor and the coloring matter is oxidized and loses its color.
For overcoming the above problems, JP-A-5-178623 publication proposes a method in which color particles having larger diameter than that of pores of a glass gel thin film and a coating composition containing a dispersant having an absorption function for the color particles are used, and calcination is carried out 300° C. or less, to form a glass gel thin film. However, this method can not give sufficient water-resistance and resistance to ultraviolet. Further, when an organic pigment is used as coloring matter, the dispersibilty and dispersion stability of the pigment are insufficient. Furthermore, sufficient qualities are not obtained in fluidity, shelf life and gloss, transparency, clearness and tinting strength of a coating film.
For improving water-resistance and resistance to ultraviolet of the above problems, JP-A-9-239311 proposes a method in which a glass gel thin film is formed by applying a metal alkoxide solution containing a specific high molecular ultraviolet-absorber onto a glass bottle and calcinating it. However, when an organic pigment is used, this method has the same problems as above.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a coating composition for coloring a glass, which is excellent in fluidity and shelf life.
It is an another object of the present invention to provide a composition for coloring a glass, which can give a coating film having ultraviolet light and/or visible light absorbing properties, water resistance and resistance to ultraviolet free from the discoloration of coloring matter by oxidation and resistance to flaw when applied to a glass, and a glass coated with this composition.
It is further another object of the present invention to provide a composition for coloring a glass, which can give a coating film excellent in gloss, transparency and clearness, and a glass coated with this composition.
It is still another object of the present invention to provide a composition for coloring a glass, which is excellent in tinting strength.
It is still further another object of the present invention to provide a process for the production of a composition for coloring a glass, which composition has the above properties
According to the present invention, there is provided a coating composition for coloring a glass, containing an organic pigment, a pigment dispersant, a silicon alkoxide compound or a metal alkoxide compound, and an organic resin.
According to the present invention, the coating composition further contains an alkoxysilane compound containing a polymerizable organic group.
According to the present invention, the pigment dispersant is at least one selected from the group consisting of a surface active agent, a resin type dispersant and an organic color residue-containing or heterocyclic ring residue-containing amine derivative.
According to the present invention, the organic color residue-containing or heterocyclic ring residue-containing amine derivative is a compound of the formula (1),
P—{X—Y—Z—N(R
1
)R
2
}
n
(1)
wherein P is an organic color residue or a heterocyclic ring residue, X is a divalent bonding group which is composed of 2 to 15 atoms selected from the group consisting of S, C, N, O and H and has a chemically rational combination, Y is a direct bond or —N(R)—, in which R is H, an alkyl group having 1 to 18 carbon atoms or —Z—N(R
1
)R
2
, Z is an alkylene group having 1 to 6 carbon atoms, each of R
1
and R
2
is independently a substituted or non-substituted alkyl group having 1 to 18 carbon atoms or a combination of R
1
and R
2
is a substituted or non-substituted heterocyclic ring which may contain N, O or S, and n is an integer of 1 to 3.
According to the present invention, the organic color residue-containing or heterocyclic ring residue-containing amine derivative is a compound of the formula (2),
wherein A is a hydroxyl group or —N(R)—Z—N(R
1
)R
2
, P, X, Z, R, R
1
and R
2
have the same meanings as those in the formula (1), T is —NH
2
, P—X— or a compound of the formula (3),
(in which, A is a hydroxyl group or —N(R)—Z—N(R
1
)R
2
, and P, X, Z, R, R
1
and R
2
have the same meanings as those in the formula (1)),
and Q is a compound of the formula (4),
or a compound of the formula (5),
According to the present invention, the organic resin is at least one resin selected from the group consisting of an acryl resin, a polyvinyl acetal resin, a cellulose resin and an urethane resin.
According to the present invention, the silicon alkoxide compound or the metal alkoxide compound is a compound of the formula (6),
M(OR
3
)r (6)
wherein M is a silicon atom or a trivalent or tetravalent metal atom, R
3
is an alkyl group having 1 to 4 carbon atoms and r is an integer of 3 or 4, or its condensate.
According to the present invention, the coating composition further contains a polymerizable organic group-containing alkoxysilane compound.
According to the present invention, the coating composition further contains an organic ultraviolet-absorber.
According to the present invention, the coating composition further contains a frictional resistance-reducing agent.
According to the present invention, there is provided a process for the production of a coating composition for coloring a glass, which comprises kneading and dispersing an organic pigment, a pigment dispersant and an organic resin with a roll mill, to obtain a solid chip and then adding a silicon alkoxide compound or a metal alkoxide compou
Hashimoto Toshiyuki
Hirata Naohisa
Oizumi Tetsuro
Tanaka Hisao
Nakarani D. S.
Toyo Ink Mfg. Co. Ltd.
Wenderoth Lind & Ponack LLP
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