Binder resin for coating paste

• US 20060192180A1
• Filed: 06/28/2004
• Published: 08/31/2006
• Est. Priority Date: 06/26/2003
• Status: Active Grant

• Current Assignee: Sekisui Chemical Company Limited (Sekisui)
• Original Assignee: Sekisui Chemical Company Limited (Sekisui)
• Inventors: Ii, Daizo, Ichitani, Motokuni, Takahashi, Hideyuki, Ochitani, Yukio, Sakashita, Katsuaki
• Granted Patent: US 7,569,166 B2
• Time in Patent Office: Days
• US Class Current: 252/500
• CPC Class Codes: B32B 18/00 Layered products essentially comprising ceramics, e.g. refractory products
• CPC Class Codes: C03C 3/072 containing boron
• CPC Class Codes: C03C 8/16 with vehicle or suspending agents, e.g. slip
• CPC Class Codes: C04B 2235/6026 Computer aided shaping, e.g. rapid prototyping
• CPC Class Codes: C04B 2235/6562 Heating rate
• CPC Class Codes: C04B 2235/6567 Treatment time
• CPC Class Codes: C04B 2237/346 Titania or titanates
• CPC Class Codes: C04B 2237/66 Forming laminates or joined articles showing high dimensional accuracy, e.g. indicated by the warpage
• CPC Class Codes: C04B 2237/704 of one or more of the ceramic layers or articles
• CPC Class Codes: C04B 35/4682 based on BaTiO3 perovskite phase
• CPC Class Codes: C04B 35/6342 Polyvinylacetals, e.g. polyvinylbutyral [PVB]
• CPC Class Codes: C04B 35/638 Removal thereof
• CPC Class Codes: C08F 16/06 Polyvinyl alcohol ; Vinyl alcohol
• CPC Class Codes: C08F 8/28 Condensation with aldehydes or ketones
• CPC Class Codes: C08F 8/48 Isomerisation; Cyclisation
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: C09D 129/14 Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols

Abstract

It is the object of the present invention to provide a binder resin for coating paste, comprising a polyvinyl acetal type resin, having an excellent dispersibility of inorganic powder such as conductive powder, ceramic powder and glass powder and being capable of exerting an extremely excellent coating property, particularly a printing property, when dispersing the inorganic powder to form paste, conductive paste, ceramic paste and glass paste. The present invention is a binder resin for coating paste for forming a film or a film pattern comprising inorganic powder by coating, which comprises a modified polyvinyl acetal resin comprising structural units represented by the following general formulas (1), (2), (3) and (4):
[Chem. 1]
in the formulas, R¹ represents a straight chain or branched alkyl group having 1 to 20 carbon atoms, and R² represents hydrogen, a straight chain, branched or cyclic alkyl group having 1 to 20 carbon atoms, or an aryl group; and n represents an integer of 1 to 8; and further in the modified polyvinyl acetal resin, a content of the structural unit represented by the general formula (3) is 1 to 20 mol % and a content of the structural unit represented by the general formula (4) is 30 to 78 mol %.

Claims

1. A binder resin for coating paste for forming a film or a film pattern comprising inorganic powder by coating,

which comprises a modified polyvinyl acetal resin comprising structural units represented by the following general formulas (1), (2), (3) and (4):

in the formulas, R¹ represents a straight chain or branched alkyl group having 1 to 20 carbon atoms, and R² represents hydrogen, a straight chain, branched or cyclic alkyl group having 1 to 20 carbon atoms, or an aryl group; and

n represents an integer of 1 to 8; and

further in the modified polyvinyl acetal resin, a content of the structural unit represented by the general formula (3) is 1 to 20 mol % and a content of the structural unit represented by the general formula (4) is 30 to 78 mol %.

2. The binder resin for coating paste according to claim 1,

wherein a content of the structural unit represented by the general formula (2) is 20 to 30 mol %.

3. The binder resin for coating paste according to claim 1,

wherein R² is CH₃ and/or C₃H₇.

4. The binder resin for coating paste according to claim 1,

wherein an α

-terpineol solution of the modified polyvinyl acetal resin adjusted to have viscosity of 6.0 Pa·

s measured at 25°

C. under the conditions of a shear rate of 60 s<sup>−

1</sup> using an E type viscometer has a ratio (η

60/η

600) between viscosity η

60 measured under the conditions of a shear rate of 60 s<sup>−

1</sup> and viscosity η

600 measured under the conditions of a shear rate of 600 s<sup>−

1</sup> at 25°

C. using an E type viscometer being 2.0 to 5.0.

5. The binder resin for coating paste according to claim 1,

wherein an α

-terpineol solution of the modified polyvinyl acetal resin adjusted to have viscosity of 6.0 Pa·

s measured at 25°

C. under the conditions of a shear rate of 60 s<sup>−

1</sup> using an E type viscometer has a phase angle at 1 Hz and at a stress of 1000 Pa being 87°

or more.

6. The binder resin for coating paste according to claim 1,

wherein an α

-terpineol solution of the modified polyvinyl acetal resin adjusted to have viscosity of 6.0 Pa·

s measured at 25°

C. under the conditions of a shear rate of 60 s<sup>−

1</sup> using an E type viscometer has a ratio (η

600→

60/η

600) between viscosity η

600 measured at a shear rate of 600 s<sup>−

1</sup> and viscosity η

60 measured after a lapse of 10 seconds from changing a shear rate to 60 s<sup>−

1</sup> using an E type viscometer being 1.9 or more, in the case of changing a shear rate from 600 s<sup>−

1</sup> to 60 s<sup>−

1</sup> at 25°

C.

7. Conductive paste,

which comprises the binder resin for coating paste according to claim 1, conductive powder and an organic solvent.

8. Ceramic paste,

which comprises the binder resin for coating paste according to claim 1, ceramic powder and an organic solvent.

9. Glass paste,

which comprises the binder resin for coating paste according to claim 1, glass powder and an organic solvent.

12. The binder resin for coating paste according to claim 2,

wherein R² is CH₃ and/or C₃H₇.

13. The binder resin for coating paste according to claim 2,

wherein an α

-terpineol solution of the modified polyvinyl acetal resin adjusted to have viscosity of 6.0 Pa·

s measured at 25°

C. under the conditions of a shear rate of 60 s<sup>−

1</sup> using an E type viscometer has a ratio (η

60/η

600) between viscosity η

60 measured under the conditions of a shear rate of 60 s<sup>−

1</sup> and viscosity η

600 measured under the conditions of a shear rate of 600 s<sup>−

1</sup> at 25°

C. using an E type viscometer being 2.0 to 5.0.

14. The binder resin for coating paste according to claim 3,

wherein an α

-terpineol solution of the modified polyvinyl acetal resin adjusted to have viscosity of 6.0 Pa·

s measured at 25°

C. under the conditions of a shear rate of 60 s<sup>−

1</sup> using an E type viscometer has a ratio (η

60/η

600) between viscosity η

60 measured under the conditions of a shear rate of 60 s<sup>−

1</sup> and viscosity η

600 measured under the conditions of a shear rate of 600 s<sup>−

1</sup> at 25°

C. using an E type viscometer being 2.0 to 5.0.

15. The binder resin for coating paste according to claim 2,

wherein an α

-terpineol solution of the modified polyvinyl acetal resin adjusted to have viscosity of 6.0 Pa·

s measured at 25°

C. under the conditions of a shear rate of 60 s<sup>−

1</sup> using an E type viscometer has a phase angle at 1 Hz and at a stress of 1000 Pa being 87°

or more.

16. The binder resin for coating paste according to claim 3,

wherein an α

-terpineol solution of the modified polyvinyl acetal resin adjusted to have viscosity of 6.0 Pa·

s measured at 25°

C. under the conditions of a shear rate of 60 s<sup>−

1</sup> using an E type viscometer has a phase angle at 1 Hz and at a stress of 1000 Pa being 87°

or more.

17. The binder resin for coating paste according to claim 2,

wherein an α

-terpineol solution of the modified polyvinyl acetal resin adjusted to have viscosity of 6.0 Pa·

s measured at 25°

C. under the conditions of a shear rate of 60 s<sup>−

1</sup> using an E type viscometer has a ratio (η

600→

60/η

600) between viscosity η

600 measured at a shear rate of 600 s<sup>−

1</sup> and viscosity η

60 measured after a lapse of 10 seconds from changing a shear rate to 60 s<sup>−

1</sup> using an E type viscometer being 1.9 or more, in the case of changing a shear rate from 600 s<sup>−

1</sup> to 60 s<sup>−

1</sup> at 25°

C.

18. The binder resin for coating paste according to claim 3,

wherein an α

-terpineol solution of the modified polyvinyl acetal resin adjusted to have viscosity of 6.0 Pa·

s measured at 25°

C. under the conditions of a shear rate of 60 s<sup>−

1</sup> using an E type viscometer has a ratio (η

600→

60/η

600) between viscosity η

600 measured at a shear rate of 600 s<sup>−

1</sup> and viscosity η

⁶⁰ measured after a lapse of 10 seconds from changing a shear rate to 60 s<sup>−

1</sup> using an E type viscometer being 1.9 or more, in the case of changing a shear rate from 600s1 to 60 s<sup>−

1</sup> at 25°

C.

19. Conductive paste,

which comprises the binder resin for coating paste according to claim 2, conductive powder and an organic solvent.

20. Conductive paste,

which comprises the binder resin for coating paste according to claim 3, conductive powder and an organic solvent.

10. An application as a binder resin for coating paste of a resin composition comprising a modified polyvinyl acetal resin consisting of structural units represented by the following general formulas (1), (2), (3) and (4):

11. A method of forming a film comprising inorganic powder,

which comprises a step of mixing a binder resin for coating paste comprising a modified polyvinyl acetal resin comprising structural units represented by the following general formulas (1), (2), (3) and (4), an organic solvent and inorganic powder, and preparing paste form:

in the formulas, R¹ represents a straight chain or branched alkyl group having 1 to 20 carbon atoms, and R² represents hydrogen, a straight chain, branched or cyclic alkyl group having 1 to 20 carbon atoms, or an aryl group; and

n represents an integer of 1 to 8; and

further in the modified polyvinyl acetal resin, a content of the structural unit represented by the general formula (3) is 1 to 20 mol % and a content of the structural unit represented by the general formula (4) is 30 to 78 mol %.