Sealing material for liquid crystal display panel, and liquid crystal display panel using it

• US 5,596,023 A
• Filed: 02/22/1995
• Issued: 01/21/1997
• Est. Priority Date: 11/18/1992
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Fujioka, Kazuyoshi, Kurokawa, Tsuyoshi, Takafuji, Yutaka, Tanaka, Fumio, Tsubota, Kojiro
• Primary Examiner(s): CHAPMAN, MARK A
• Application Number:
  US08/392,400
• Time in Patent Office: 699 Days
• Field of Search: 522/100, 430/20
• US Class Current: 522/100
• CPC Class Codes: C08F 299/028 photopolymerisable compositions
• CPC Class Codes: C09J 163/10 Epoxy resins modified by unsaturated compounds
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells

Abstract

A liquid crystal display panel in which a liquid crystal composition is held between a pair of transparent substrates and the peripheral edges of both the substrates are sealed with a sealing material comprising (a) a partially esterified epoxy (meth)acrylate resin where 10-90% of an equivalent of the epoxy group of a bisphenol A type epoxy resin is (meth)acrylated, (b) a photopolymerization initiator, and (c) a thermosetting agent; and a sealing material for the liquid crystal display panel comprising the above-mentioned components (a), (b) and (c).

Claims

1. A sealing material for a liquid crystal display panel comprising the following components (a), (b) and (c):

(a) a partially esterified epoxy(meth)acrylate resin in which 10-90% of an equivalent of the epoxy group of a bisphenol A type epoxy resin is (meth)acrylated,

(b) a photopolymerization initiator, and

(c) a thermosetting agent comprising one or more imidazole and one or more organic acid hydrazide.

2. The sealing material for a liquid crystal display panel according to claim 1 wherein the amount of said component (b) to be blended is in the range of 0.1 to 15 parts by weight with respect to 100 parts by weight of said component (a).

3. The sealing material for a liquid crystal display panel according to claim 1 wherein the amount of said component (c) to be blended is in the range of 0.1 to 20 parts by weight with respect to 100 parts by weight of said component (a).

4. The sealing material for a liquid crystal display panel according to claim 1 which contains at least one of a reactive diluent, an inorganic filler and a coupling agent, in addition to said components (a), (b) and (c).

5. The sealing material for a liquid crystal display panel according to claim 4 wherein the amount of said reactive diluent to be blended is 100 parts by weight or less with respect to 100 parts by weight of said component (a).

6. The sealing material for a liquid crystal display panel according to claim 4 wherein the amount of said inorganic filler to be blended is 100 parts by weight or less with respect to 100 parts by weight of said component (a).

7. The sealing material for a liquid crystal display panel according to claim 4 wherein the amount of said coupling agent to be blended is 10 parts by weight or less with respect to 100 parts by weight of said component (a).

8. The sealing material for a liquid crystal display panel according to claim 1 wherein a spacer is blended in an amount of 1 to 50 parts by weight with respect to 100 parts by weight of said sealing material.