One-pack type epoxy sealant with amine-type curing agent, for liquid crystal cell, display apparatus and recording apparatus

• US 5,150,239 A
• Filed: 02/08/1991
• Issued: 09/22/1992
• Est. Priority Date: 02/09/1990
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Watanabe, Yasuyuki, Suzuki, Masaaki, Shimamune, Masayuki
• Primary Examiner(s): Miller, Stanley D.
• Assistant Examiner(s): GROSS, ANITA P
• Application Number:
  US07/652,661
• Time in Patent Office: 592 Days
• Field of Search: 350/343, 350/344, 359/80, 359/81
• US Class Current: 349/153
• CPC Class Codes: C08G 59/4035 Hydrazines; Hydrazides
• CPC Class Codes: C08G 59/56 together with other curing agents
• CPC Class Codes: G02F 1/13392 spacers dispersed on the cell substrate, e.g. spherical particles, microfibres

Abstract

A liquid crystal cell is prepared by bonding a pair of oppositely disposed electrode plates with a sealant of a one-pack type epoxy adhesive to define a space to be filled with a liquid crystal. In advance of the use, the one-pack type epoxy adhesive is modified with an amine-type room temperature hardener to selectively reduce a low-molecular weight fraction in the epoxy adhesive so as to avoid a sealant flow at an elevated temperature. This is particularly advantageous when the sealant is used in combination with a particulate adhesive which is disposed in the liquid crystal space and activated at such an elevated temperature to bond the electrode plates while keeping an accurate gap between the electrode plates.

Claims

1. A sealant for a liquid crystal cell wherein a pair of oppositely disposed electrode plates are bonded to each other with the sealant to define a space to be filled with a liquid crystal, comprising a one-pack type thermosetting epoxy adhesive containing a potential hardener activatable at an elevated temperature, and an amine-type room temperature hardener modifying the epoxy adhesive added in a proportion of 1.0-3.0 wt. % of the total of the epoxy adhesive and the amine-type room temperature hardener.

2. A sealant according to claim 1, wherein the amine-type room temperature hardener is added in a proportion of 1.8-3.0 wt. % of the total of the epoxy adhesive and the amine-type room temperature hardener.

3. A sealant according to claim 2, wherein said one-pack type thermosetting epoxy adhesive comprises an epoxy-resin and the potential hardener, and said amine-type room temperature hardener is added in a proportion of 0.2-0.8 equivalent for one equivalent of the epoxy resin in the epoxy adhesive.

4. A sealant according to claim 3, wherein said amine-type room temperature hardener is added in a proportion of 0.25-0.5 equivalent for one equivalent of the epoxy resin in the epoxy adhesive.

5. A sealant according to claim 1, wherein said one-pack type thermosetting epoxy adhesive comprises an epoxy resin and the potential hardener, and said amine-type room temperature hardener is added in a proportion of 0.2-0.8 equivalent for one equivalent of the epoxy resin in the epoxy adhesive.

6. A sealant according to claim 5, wherein said amine-type room temperature hardener is added in a proportion of 0.2-0.8 equivalent for one equivalent of the epoxy resin in the epoxy adhesive.

7. A sealant for a liquid crystal cell wherein a pair of oppositely disposed electrode plates are bonded to each other with the sealant to define a space to be filled with a liquid crystal, comprising a one-pack type thermosetting epoxy adhesive comprising an epoxy-resin and a potential hardener activatable at an elevated temperature, and an amine-type room temperature hardener modifying the epoxy adhesive added in a proportion of 0.2-0.8 equivalent for one equivalent of the epoxy resin in the epoxy adhesive.

8. A sealant according to claim 7, wherein said amine-type room temperature hardener is added in a proportion of 0.25-0.5 equivalent for one equivalent of the epoxy resin in the epoxy adhesive.

9. A sealant, comprising an epoxy resin, a hydrazide compound, a filler, and an amine-type room temperature hardener, said amine-type room temperature hardener being present in a proportion of 1.0-3.0 wt. % of the total of the epoxy resin, the hydrazide compound and the amine-type room temperature hardener.

10. A liquid crystal cell, comprising a pair of oppositely disposed electrode plates having a sealant bonding the electrode plates to define a space, and a liquid crystal filling the space, wherein the sealant is a cure product of a one-pack type thermosetting epoxy adhesive containing a potential hardener activatable at an elevated temperature, said sealant further comprising an amine-type room temperature hardener added in a proportion of 1.0-3.0 wt. % of the total of the epoxy adhesive and the amine-type room temperature hardener.

11. A liquid crystal cell according to claim 10, which further comprises a particulate adhesive disposed in the space and bonding the electrode plates.

12. A display apparatus, comprising:

a liquid crystal cell, a clock signal generator, a scanning electrode selector, a scanning electrode driver, a data generator, a data modulator and a signal electrode driver;

wherein said liquid crystal comprises a pair of oppositely disposed electrode plates having a sealant bonding the electrode plates to define a space, and a liquid crystal filling the space, wherein the sealant is a cured product of a one-pack type thermosetting epoxy adhesive containing a potential hardener activatable at an elevated temperature, said sealant further comprising an amine-type room temperature hardener added in a proportion of 1.0-3.0 wt. % of the total of the epoxy adhesive and the amine-type room temperature hardener.

13. A recording apparatus, comprising:

a liquid crystal shutter array including a liquid crystal cell, a clock signal generator, a scanning electrode selector, a scanning electrode driver, a data generator, a data modulator and a signal electrode driver;

a light source;

a photosensitive member; and

a developing device;

wherein said liquid crystal cell comprises a pair of oppositely disposed electrode plates having a sealant bonding the electrode plates to define a space, and a liquid crystal filling the space, wherein the sealant is a cured product of a one-pack type thermosetting epoxy adhesive containing a potential hardener activatable at an elevated temperature, said sealant further comprising an amine-type room temperature hardener added in a proportion of 1.0-3.0 wt. % of the total of the epoxy adhesive and the amine-type room temperature hardener.