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(Meth)acrylic resin

A technology of acrylic resin and methyl, which is applied in the direction of instruments, optics, optical components, etc., can solve the problems of large birefringence of resin, and achieve the effects of small photoelastic coefficient, excellent heat resistance, and high surface hardness

Active Publication Date: 2017-11-28
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, resins obtained by imidizing acrylic resins with methylamine have a disadvantage of large positive birefringence

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0147] (A) Preparation of (meth)acrylic resin

[0148] Into an autoclave with a capacity of 2 L, 29.5 parts by weight of methyl methacrylate [manufactured by Sumitomo Chemical Co., Ltd., trade name: SUMIPEX EX, weight average molecular weight: 140,000], 27.3 parts by weight of aniline, and 33.2 parts by weight of toluene were charged. This autoclave was heated up to 240 degreeC, and it stirred for 3 hours, and the reaction solution was obtained.

[0149] Next, the reaction solution obtained above is introduced into the cylinder at a processing speed of 300 g / hour in terms of resin amount, the temperature of the cylinder is 260 ° C, the rotation speed is 70 rpm, the degree of vacuum is 13.3 hPa to 400 hPa (10 mmHg to 300 mmHg), and the number of rear exhaust ports is 1 In a vented twin-screw extruder (hole diameter: 15mm, L / D: 45) with two front vent ports, devolatilization is performed in the extruder and extruded to obtain transparent particles of (meth)acrylic resin. The (...

Embodiment 2

[0182] (A) Preparation of (meth)acrylic resin

[0183] In Example 1, except having changed the reaction temperature of the autoclave into 245 degreeC, it carried out similarly to Example 1, and obtained the (meth)acrylic-type resin. The obtained (meth)acrylic resin had a weight average molecular weight of 100,000.

[0184] The (meth)acrylic resin obtained above is the following (meth)acrylic resin: R in formula (I) 1 is methyl, R 2 is a hydrogen atom, R 3 is a repeating unit of phenyl and R in formula (II) 4 is a hydrogen atom, R 5 is methyl, R 6 It is a repeating unit of methyl group, and its glass transition temperature is 152°C. The imidation rate of this (meth)acrylic resin, content of the repeating unit represented by formula (II), and stress optical coefficient (Cr) were investigated similarly to Example 1. As a result, the imidization rate of the (meth)acrylic resin was 20.9%, the content of the repeating unit represented by the formula (II) was 60.4% by weight, ...

Embodiment 3

[0190] (A) Preparation of (meth)acrylic resin

[0191] In Example 1, except having changed the reaction temperature of the autoclave into 247 degreeC and cylinder temperature into 270 degreeC, it carried out similarly to Example 1, and obtained the (meth)acrylic resin. The obtained (meth)acrylic resin had a weight average molecular weight of 90,000.

[0192] The (meth)acrylic resin obtained above is the following (meth)acrylic resin: R in formula (I) 1 is methyl, R 2 is a hydrogen atom, R 3 is a repeating unit of phenyl and R in formula (II) 4 is a hydrogen atom, R 5 is methyl, R 6 It is a repeating unit of methyl group, and its glass transition temperature is 160°C. The imidation rate of this (meth)acrylic resin, content of the repeating unit represented by formula (II), and stress optical coefficient (Cr) were investigated similarly to Example 1. As a result, the imidization ratio of the (meth)acrylic resin was 23.9%, the content of the repeating unit represented by t...

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Abstract

A (meth)acrylic resin comprising a (meth)acrylic resin, wherein the (meth)acrylic resin has a repeating unit represented by formula (I) (wherein R1 and R2 independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and R3 represents a ring structure) and a repeating unit represented by formula (II) (wherein R4 and R5 independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and R6 represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or an aryl group having 6 to 10 carbon atoms).

Description

technical field [0001] The present invention relates to (meth)acrylic resins. More specifically, the present invention relates to optical discs such as protective films for substrates of optical discs such as VD, CD, DVD, MD, and LD, and polarizing element protective films used in polarizers included in image display devices such as LCDs and other liquid crystal display devices. Optical films represented by protective films, anti-reflective films used in organic EL displays (OLEDs), transparent conductive films formed with transparent conductive layers such as ITO layers; image display devices equipped with the above optical films; A (meth)acrylic resin used as a raw material for the above-mentioned optical film. Background technique [0002] In recent years, for image display devices, the development of optical materials having high optical characteristics has been demanded in order to improve the sharpness of images. As one of high optical characteristics, birefringence ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/32C08J5/18G02B5/30
CPCC08J5/18C08J2333/12G02B1/04G02B1/14C08L33/24C08L33/08C08L33/10C08F8/32C08F20/10C08F20/52G02B1/12
Inventor 大西隆司盐谷佳之安村和成中西秀高今泉洋平
Owner NIPPON SHOKUBAI CO LTD
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