CN-121991446-A - Resin composition, resin film, polarizing plate and liquid crystal display panel

Abstract

The present invention provides a resin composition comprising an acrylic resin and a copolymer, wherein the acrylic resin is a1 st resin or a 2 nd resin, the 1 st resin comprises an alkyl methacrylate unit, the content of the alkyl acrylate unit is less than 0.1 wt%, the 2 nd resin comprises a ring structure in a main chain, the carboxylic acid group amount is 0.3mmol/g or less, the copolymer comprises an aromatic vinyl unit and a methacrylic acid unit, the content of the methacrylic acid unit is 10wt% or more, the weight ratio of the acrylic resin to the copolymer is 30/70 to 99/1, and the glass transition temperature of the resin composition is 118 ℃ or more.

Inventors

• KATAOKA NAOTO

Assignees

• 株式会社钟化

Dates

Publication Date

20260508

Application Date

20251031

Priority Date

20241101

Claims (11)

1. 1. A resin composition comprising an acrylic resin and a copolymer, The acrylic resin is the 1 st resin or the 2 nd resin, The 1 st resin contains an alkyl methacrylate unit, the content of the alkyl acrylate unit is less than 0.1 wt%, The 2 nd resin contains a ring structure in a main chain, the carboxylic acid group amount is 0.3mmol/g or less, The copolymer comprises an aromatic vinyl unit and a methacrylic acid unit, the content of the methacrylic acid unit is 10 wt% or more, The weight ratio of the acrylic resin to the copolymer is 30/70-99/1, The glass transition temperature of the resin composition is 118 ℃ or higher.
2. 2. The resin composition according to claim 1, wherein the glass transition temperature is 120 ℃ or higher.
3. 3. A resin composition comprising an acrylic resin and a copolymer, The acrylic resin is the 1 st resin or the 2 nd resin, The 1 st resin contains an alkyl methacrylate unit, the content of the alkyl acrylate unit is less than 0.1 wt%, The 2 nd resin contains a ring structure in a main chain, the carboxylic acid group amount is 0.3mmol/g or less, The copolymer comprises an aromatic vinyl unit and a methacrylic acid unit, the content of the methacrylic acid unit is 10 wt% or more, The weight ratio of the acrylic resin to the copolymer is 30/70-99/1, The haze when the film is formed into a film having a thickness of 200 μm is 0.5% or less.
4. 4. The resin composition according to any one of claims 1 to 3, wherein the increase rate of methyl methacrylate after heating at 260 ℃ for 1 hour is 0.8% by weight or less.
5. 5. The resin composition according to claim 1 or 2, wherein the aromatic vinyl unit is a styrene unit.
6. 6. The resin composition according to any one of claims 1 to 3, which is a particle.
7. 7. A resin film formed by molding the resin composition according to any one of claims 1 to 3.
8. 8. The resin film according to claim 7, which is an optical film.
9. 9. The resin film according to claim 8, which is a retardation film.
10. 10. A polarizing plate comprising the resin film according to claim 9.
11. 11. A liquid crystal display panel comprising the polarizing plate according to claim 10.

Description

Resin composition, resin film, polarizing plate and liquid crystal display panel Technical Field The invention relates to a resin composition, a resin film, a polarizing plate and a liquid crystal display panel. Background In a liquid crystal display panel, a retardation film is used for the purpose of preventing a contrast decrease and a color change due to a viewing angle, that is, for the purpose of optical compensation or viewing angle compensation. Conventionally, a method of producing a retardation film by extrusion molding a resin composition containing an acrylic resin and a styrene-acrylonitrile copolymer is known, but the styrene-acrylonitrile copolymer is easily colored yellow in addition to a low glass transition temperature. Patent document 1 describes a resin composition for an optical element, which contains an acrylic resin (a) and a styrene resin (B). Wherein the styrene resin (B) is a styrene-methacrylic acid copolymer (B-1). In addition, the use of a methyl methacrylate-alkyl acrylate copolymer as the acrylic resin (a) is described. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 2008-268929 Disclosure of Invention However, the resin composition described in patent document 1 has a low glass transition temperature, and cannot be used to produce a film having low haze. The purpose of the present invention is to provide a resin composition which has a high glass transition temperature and can produce a film having low haze. (1) A resin composition comprising an acrylic resin and a copolymer, wherein the acrylic resin is a 1 st resin or a2 nd resin, the 1 st resin comprises an alkyl methacrylate unit, the content of the alkyl acrylate unit is less than 0.1 wt%, the 2 nd resin comprises a ring structure in a main chain, the carboxylic acid group amount is 0.3mmol/g or less, the copolymer comprises an aromatic vinyl unit and a methacrylic acid unit, the content of the methacrylic acid unit is 10 wt% or more, the weight ratio of the acrylic resin to the copolymer is 30/70 to 99/1, and the glass transition temperature of the resin composition is 118 ℃ or more. (2) The resin composition according to (1), wherein the glass transition temperature is 120℃or higher. (3) A resin composition comprising an acrylic resin and a copolymer, wherein the acrylic resin is a 1 st resin or a2 nd resin, the 1 st resin comprises an alkyl methacrylate unit, the content of the alkyl acrylate unit is less than 0.1 wt%, the 2 nd resin comprises a ring structure in a main chain, the carboxylic acid group amount is 0.3mmol/g or less, the copolymer comprises an aromatic vinyl unit and a methacrylic acid unit, the content of the methacrylic acid unit is 10 wt% or more, the weight ratio of the acrylic resin to the copolymer is 30/70 to 99/1, and the haze when a film having a thickness of 200 [ mu ] m is produced is 0.5% or less. (4) The resin composition according to any one of (1) to (3), wherein the increase rate of methyl methacrylate after heating at 260℃for 1 hour is 0.8% by weight or less. (5) The resin composition according to any one of (1) to (4), wherein the aromatic vinyl unit is a styrene unit. (6) The resin composition according to any one of (1) to (5), which is a particle. (7) A resin film formed by molding the resin composition according to any one of (1) to (6). (8) The resin film according to (7), which is an optical film. (9) The resin film according to (8), which is a retardation film. (10) A polarizing plate comprising the resin film according to (9). (11) A liquid crystal display panel comprising the polarizing plate of (10). According to the present invention, a resin composition having a high glass transition temperature and capable of producing a film having low haze can be provided. Detailed Description Hereinafter, embodiments of the present invention will be described. (Resin composition) The resin composition of the present embodiment includes an acrylic resin and a copolymer, and the acrylic resin is the 1 st resin or the 2 nd resin. The resin composition of the present embodiment is used for, for example, the production of a retardation film. Hereinafter, a mixture of the acrylic resin and the copolymer contained in the resin composition of the present embodiment is referred to as a mixed resin. The resin composition of the present embodiment may be composed of only the mixed resin, or may further contain an additive such as an ultraviolet absorber or a lubricant, in addition to the mixed resin. In the context of the present specification and patent claims, acrylic resin refers to a polymer comprising constituent units derived from monomers having an acryl group and/or constituent units derived from monomers having a methacryl group. At this time, the acrylic resin may be any one of a homopolymer and a copolymer. In the case where the acrylic resin is a copolymer, the acrylic resin may contain a constituent unit derived from a monomer having no acryl or