# US 2014/0154436 A1 · Non-toxic water-based frit slurry paste, and assembly incorporating the same

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- Number: US 2014/0154436 A1
- Document ID: US20140154436A1
- Status: Published application
- Kind: A1
- Application number: 14/174,871
- Filed: 2014-02-07
- Published: 2014-06-05
- Earliest claimed: 2009-06-30
- Assignees: Guardian Industries Corp.
- Applicants: Guardian Industries Corp.
- Inventors: David J. COOPER; Timothy A. DENNIS
- Web page: https://patentgrep.com/patent/US20140154436A1

## CPC

- C03C 8/24: Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders
- B32B 15/043: {of metal (B32B15/01 takes precedence)}
- B32B 17/06: comprising glass as the main or only constituent of a layer, next to another layer of a specific {material}
- B32B 17/10036: {comprising two outer glass sheets}
- B32B 17/10091: {thermally hardened}
- B32B 17/101: {having a predetermined coefficient of thermal expansion [CTE]}
- B32B 17/10302: {Edge sealing}
- C03C 8/02: Frit compositions, i.e. in a powdered or comminuted form
- C03C 8/14: Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions
- C03C 8/16: with vehicle or suspending agents, e.g. slip
- C03C 27/06: Joining glass to glass by processes other than fusing (fusing C03B23/20; units for use as elements for closing wall or like openings and comprising two or more parallel glass panes in spaced relationship, the panes being permanently secured together E06B3/66)
- E06B 3/6612: {Evacuated glazing units}
- E06B 3/66333: {of unusual substances, e.g. wood or other fibrous materials, glass or other transparent materials}
- E06B 3/67326: {Assembling spacer elements with the panes}
- B32B 9/041: {of metal}
- B32B 15/01: all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)}
- B32B 17/061: {of metal}
- C03C 2207/00: Compositions specially applicable for the manufacture of vitreous enamels
- E06B 3/663: Elements for spacing panes
- E06B 3/66342: {characterised by their sealed connection to the panes}
- E06B 3/673: Assembling the units (E06B3/677 takes precedence {; making hollow glass sheets or bricks C03B23/24})
- E06B 3/6733: {by applying, e.g. extruding, a ribbon of hardenable material on or between the panes}
- E06B 2003/66338: {of glass}
- Y10T 156/10: Methods of surface bonding and/or assembly therefor
- Y10T 428/24777: Edge feature
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Certain example embodiments of this invention relate to a frit slurry paste for use in assemblies (e.g., a vacuum insulated glass unit or a plasma display panel), and methods of making the same. Frit powder, binder material, and a water-based solvent are mixed together to form an intermediate mixture. The frit powder is substantially lead free, and the water-based solvent is provided at a first temperature. Additional water-based solvent is added to the intermediate mixture to form a frit slurry paste. The additional water-based solvent is provided at a second temperature, with the second temperature being lower than the first temperature. The binder material is provided at a concentration of 0.001%-20% by weight with respect to the frit slurry paste or the frit slurry paste absent the frit powder. The frit slurry paste has a bulk viscosity of 2,000-200,000 cps.

## Claims

### Claim 1

A frit slurry paste, comprising:
a water-based solvent;
a bismuth- or ceramic-based frit powder, the frit powder being substantially free from lead; and
a binder comprising methylcellulose at a concentration of 0.25%-5% by weight,
wherein the fit slurry paste has a bulk viscosity of 2,000-200,000 cps.

### Claim 2 (depends on 1)

The frit slurry paste of claim 1, wherein the binder is provided at a concentration of 0.5-1.5% by weight.

### Claim 3 (depends on 2)

The frit slurry paste of claim 2, wherein the binder is methylcellulose 400 cps 2% aqueous solution.

### Claim 4 (depends on 1)

The frit slurry paste of claim 1, further comprising a surfactant.

### Claim 5 (depends on 1)

The frit slurry paste of claim 1, further comprising non-lead additives capable of absorbing 800-2000 nm infrared radiation.

### Claim 6 (depends on 1)

The frit slurry paste of claim 1, wherein the frit slurry paste produces a frit once fired, the frit having a linear coefficient of thermal expansion (CTE) approximating the CTE of glass or metal.

### Claim 7 (depends on 1)

The frit slurry paste of claim 1, wherein the binder is substantially free from hydrocarbons.

### Claim 8 (depends on 1)

The frit slurry paste of claim 1, wherein the frit powder is a Bi2O3—B2O3 inclusive system.

### Claim 9

An assembly, comprising:
at least one substrate;
a frit formed on the at least one substrate, the frit being formed by firing a frit slurry paste applied to the at least one substrate, the frit slurry paste comprising:
a water-based solvent;
a bismuth- or ceramic-based frit powder, the frit powder being substantially free from lead; and
a binder comprising a gelatinous material at a concentration of 0.001%-20% by weight,
wherein the frit slurry paste has a bulk viscosity of 2,000-200,000 cps.

### Claim 10 (depends on 9)

The assembly of claim 9, wherein the binder is provided at a concentration of 0.5-1.5% by weight.

### Claim 11 (depends on 10)

The assembly of claim 10, wherein the binder is methylcellulose 400 cps 2% aqueous solution.

### Claim 12 (depends on 9)

The assembly of claim 9, further comprising non-lead additives capable of absorbing 800-2,000 nm infrared radiation.

### Claim 13 (depends on 10)

The assembly of claim 10, further comprising first and second substrates,
wherein the frit is provided as an edge seal between the first and second substrates.

### Claim 14 (depends on 13)

The assembly of claim 13, wherein the assembly is a vacuum insulating glass (VIG) unit.

### Claim 15 (depends on 9)

The assembly of claim 9, wherein the frit is sandwiched between the at least one substrate and a metal layer.

### Claim 16 (depends on 15)

The assembly of claim 15, wherein the assembly a plasma display panel (PDP).

### Claim 17 (depends on 9)

The assembly of claim 9, wherein the frit powder is a Bi2O3—B2O3 inclusive system.

### Claim 18

A method of making a frit slurry paste, the method comprising:
mixing together frit powder, binder material, and a water-based solvent to form an intermediate mixture, the frit powder being substantially lead free, the water-based solvent being provided at a first temperature; and
adding additional water-based solvent to the intermediate mixture to form a frit slurry paste, the additional water-based solvent being provided at a second temperature, the second temperature being lower than the first temperature,
wherein the binder material is provided at a concentration of 0.001%-20% by weight with respect to the frit slurry paste or the frit slurry paste absent the frit powder, and
wherein the frit slurry paste has a bulk viscosity of 2,000-200,000 cps.

### Claim 19 (depends on 18)

The method of claim 18, wherein the first temperature is 100-212 degrees F., and wherein the second temperature is at or about ambient or room temperature.

### Claim 20 (depends on 18)

The method of claim 18, wherein the frit powder is a bismuth- or ceramic-based frit powder.

### Claim at position 21

21-28. (canceled)