JPS58211445A - Separable glass board laminate and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a separable stack of glass sheets and a variety of materials between the stacked glass sheets, such as powdered glass separation materials such as paper or wood flour, polyethylene, polystyrene or polyacrylate. It is known to protect glass surfaces from damage by intervening.

This powdered glass plate separation material is composed of fine particles, has a sufficiently homogeneous particle size distribution, and is fluid enough to be applied using commercially available conventional equipment. It is preferable to have one.

U.S. Pat. No. 6,726,512 to May discloses a powdered glass plate separation material in which powdered bulk salicylic acid is mixed with an inert glass plate separation material such as polystyrene particles. .

The powdered glass separation material is spread onto the glass surface by means of a duster or other powder dispersion device known to those skilled in the art as a device for dispersing powdered glass separation material in powder form, such as wood flour. Ru.

U.S. Patent No. 4.2 by Albach (A), Bach
No. 00.670 discloses a method in which water, ammonium chloride as an antifouling material, and wood flour as a glass plate separation material are continuously applied to the surface of a glass plate in multiple steps. According to one embodiment disclosed in this patent specification, water and an antifouling material, in particular an antifouling material, are first applied to a glass plate in the form of an aqueous solution to form a wetting layer on the surface of the glass plate; Dry particles of glass plate separation material are then sprinkled directly onto the wet layer. In this method, water is first sprayed onto the glass surface and an aqueous solution of the antifouling material is applied, followed by spraying the glass plate separating material in the form of dry particles, or the antifouling material is first applied in the form of dry particles. and a glass plate separation material are sprinkled onto the glass surface, and then water is sprayed onto the layer of this dry mixture.

However, in these conventional methods, it is difficult to uniformly disperse or apply the glass plate separation material, and there is also a problem in the adhesion of the glass plate separation material to the glass plate surface.

The inventors of the present invention have found that the problems associated with this process can be solved by applying a powdered glass plate separation material to the glass surface in the form of an aqueous slurry, and have completed the present invention.

That is, the present invention involves adding water to a powdered glass plate separation material, especially wood flour to form an aqueous slurry, applying this to the glass surface, and after drying, forming a uniformly adhered layer of the glass plate separation material on the glass surface. The present invention relates to a method for manufacturing a glass plate laminate characterized by:

In the laminate obtained by the method of the present invention, the glass plate separation material is sufficiently attached to the surface of the glass plate even when the glass plates are in contact with each other and during transportation, and the glass plate after disassembly is coated or laminated. By cleaning before treatment, the glass plate separation material can be easily removed and the glass plate will not be adversely affected by such treatment.

The method of the present invention will be explained in more detail.

The glass plate is treated with an aqueous slurry of powdered glass plate separation material. The powdered glass plate separation material may be any finely ground material such as wood flour, rice flour, vermiculite, polyethylene, polyester, polymethyl methacrylate, etc. Among these, wood flour,
Porous cellulosic materials such as rice flour are preferred, and the I/b aqueous slurry can be obtained, for example, by dispersing about 1 to 100 parts of wood flour, preferably 10 to 20 parts of wood flour, in 1 part of water. The resulting aqueous slurry is applied to the glass surface by conventional methods, preferably by flooding or spraying. Although it is possible to dry the applied slurry at high temperature, it is preferably dried at room temperature. The glass surface after drying is covered with a uniformly adhered glass plate separation material.

A method of incorporating a strongly acidic organic compound into a glass plate separation material is disclosed in US Patent Application No. 229,200 by the present inventors.
It is described in Specification No. 8.

The slurry of the present invention also includes a slurry obtained by dispersing a porous glass plate separation material such as wood flour in an aqueous solution of a strongly acidic organic compound. The strongly acidic organic compound is preferably one that is water-soluble, solid at room temperature, and has a basis weight of less than about 3 tsubo in an aqueous solution with a concentration of about 1%. Specific examples of strongly acidic organic compounds include organic tin compounds such as tin chloride, particularly one or more alkyltin chlorides selected from the group consisting of methyltin trichloride, dimethyltin dichloride, and trimethyltin chloride. is preferred. Organic acids such as citric acid, malic acid, and tartaric acid can be used if the glass is tempered without cleaning, in which case these acids are completely decomposed by heat and the tempered glass plate is heated. Does not leave any residue on surfaces.

Next, the present invention will be explained with reference to Examples, but the present invention is not limited to these Examples, and other powdered glass plate separation materials may be used as long as they do not depart from the spirit of the present invention. Various modifications are possible, such as changing the presence or absence of the antifouling material, its concentration, or the application method.

An aqueous slurry was prepared by dispersing 1 g of wood flour in 100 ml of water containing 1 wt. This slurry was applied to glass at room temperature and dried. The amount of slurry applied was enough to coat approximately 20,000 square feet of glass surface per bond of wood flour. In this way, the glass plates with the glass plate separation material uniformly adhered to the glass surfaces are stacked to form a glass plate laminate, and the temperature is 1.
The samples were left in harsh conditions of 40°F (approximately 60°0) and 100% relative temperature, and the presence or absence of bleed was examined. The glass surface did not change at all even after being left for 45 days.

Additionally, the glass plate separation material remained firmly adhered to the glass surface throughout handling and shipping of the glass plate laminate and was easily removed by conventional cleaning during the pretreatment step of the coating and laminating process.

An aqueous slurry was prepared. This slurry was applied to a glass plate at room temperature and dried until a uniformly adhered layer of the glass plate separation material was formed on the glass surface. The treated glass plates were stacked and subjected to the same test as in Example 1. No serious stains appeared on the glass surface even after 85 days, and the glass plate separation material could be easily removed.

Example 6 Glass treated with an aqueous wood flour slurry containing 1% by weight citric acid was subjected to the above test for over 64 days without significant staining.

Example 4 Glass treated with an aqueous wood flour slurry containing 1% by weight tartaric acid was subjected to the above test for over 64 days and remained in good condition.

Example 5 Glass treated with an aqueous rice flour slurry containing 2% by weight of boric acid was subjected to the above test for 59 days and remained in good condition.

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Claims (1)

[Scope of Claims] 1(a) A plurality of glass plates stacked so as to face each other, and (1,,) a powdery glass plate separation material provided on the surface of each glass plate. A glass plate laminate consisting of a uniformly adhered layer of a powdered glass plate separation material obtained by applying an aqueous slurry of and drying it. 2. The laminate according to claim 1, wherein the powdered glass plate separation material is wood flour. 6 The wood powder layer is made by applying 1 pound of wood powder to the glass surface of 20.0
3. A laminate according to claim 2, formed by coating an area of 0.00 to 25,000 square feet. 4. The laminate according to claim 1, wherein the aqueous slurry contains a strongly acidic organic compound. 5. The laminate according to claim 4, wherein the strongly acidic organic compound is an alkyltin chloride. 6 (a) Dispersing a powdered glass plate separating material in water to form an aqueous slurry, (b) applying the aqueous slurry to a glass surface, and (c) drying the aqueous slurry to prepare a glass plate separating material. A method for producing a separable glass plate laminate, characterized by forming a uniformly adhered layer of on a glass surface. 7. The method of claim 6, wherein the powdered glass plate separation material is wood flour. 8. The method according to claim 7, wherein the aqueous slurry is one in which 1 to 100 g of a wood flour layer is dispersed in 1 part of water. 9. The method according to claim 6, wherein the aqueous slurry contains an antifouling agent. 10. The method according to claim 9, wherein the antifouling agent is a strongly acidic organic compound. 11. The method according to claim 10, wherein the antifouling agent is an organic tin compound. 12. The method of claim 11, wherein the organotin compound is an alkyltin chloride selected from the group consisting of methyltin trichloride, dimethyltin dichloride, trimethyltin chloride, and mixtures thereof. 16 The aqueous slurry has a weight ratio of about 0.1 to 5 weight 1 to water.
% alkyltin chloride. 14. The method of claim 16, wherein the alkyltin chloride is a mixture of 80% by weight dimethyltin dichloride and 20% by weight methyltin trichloride. 15. The method of claim 14, wherein the aqueous slurry contains about 1 g of wood flour per 100 ml of water.