Methacrylic resin composition

A technology of methacrylate and methacrylic acid, which is applied in the field of methacrylic resin composition, can solve the problems of difficulty in obtaining high-precision optical components, low productivity of molded products, and dimensional changes, and achieves good appearance and saturated water absorption. Low, small size change effect

Inactive Publication Date: 2015-07-22
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In low-temperature injection molding, the productivity of molded products is low, residual stress remains in the obtained molded products, and dimensional changes easily occur with heat, making it difficult to obtain high-precision optical components

Method used

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  • Methacrylic resin composition
  • Methacrylic resin composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] 78 parts by mass of purified methyl methacrylate, 20 parts by mass of dicyclopentyl methacrylate, and 2 parts by mass of methyl acrylate were added to an autoclave equipped with a stirrer and a collection pipe to prepare a monomer mixture. The yellowness index of the monomer mixture was 0.9. Add 0.006 parts by mass of a polymerization initiator (2,2'-azobis(2-methylpropionitrile (AIBN), dehydrogenation capacity: 1%, 1-hour half-life temperature: 83°C) to the monomer mixture and chain transfer Agent (n-octyl mercaptan) 0.37 parts by mass was dissolved to obtain a raw material liquid. Oxygen in the production apparatus was driven out with nitrogen.

[0126] A certain amount of the raw material liquid was discharged from the autoclave, and supplied to a continuous flow tank reactor controlled at a temperature of 140° C. at a constant flow rate so that the average residence time was 120 minutes, and bulk polymerization was performed. The reaction solution was fractionated ...

Embodiment 2

[0134] In addition to changing the amount of methyl methacrylate to 73 parts by mass, changing the amount of dicyclopentyl methacrylate to 25 parts by mass and changing the amount of n-octyl mercaptan to 0.35 parts by mass, by implementing The same method as Example 1 was used to obtain the granular methacrylic resin composition of the present invention. The polymer physical properties of the obtained granular methacrylic resin composition were measured by the same method as in Example 1. In addition, molded articles (flat plate L and flat plate S) were produced in the same manner as in Example 1, and physical properties were evaluated. These results are shown in Table 1.

Embodiment 3

[0136] In addition to changing the amount of methyl methacrylate to 83 parts by mass, changing the amount of dicyclopentyl methacrylate to 15 parts by mass and changing the amount of n-octyl mercaptan to 0.32 parts by mass, by implementing The same method as Example 1 was used to obtain the granular methacrylic resin composition of the present invention. The polymer physical properties of the obtained granular methacrylic resin composition were measured by the same method as in Example 1. In addition, molded articles (flat plate L and flat plate S) were produced in the same manner as in Example 1, and physical properties were evaluated. These results are shown in Table 1.

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Abstract

A methacrylic resin composition containing a methacrylic resin which contains 50-90mass% of structural units derived from methyl methacrylate and 10-50mass% of structural units derived from a methacrylic acid alicyclic hydrocarbon ester, wherein the difference between the yellowness index (YI4) at an optical path length of 200nm for an injection molded article obtained at a cylinder temperature of 280°C and a molding cycle of 4 minutes and the yellowness index (YI1) at an optical path length of 200nm for an injection molded article obtained at a cylinder temperature of 280°C and a molding cycle of 1 minute is 3 or less, and the melt flow rate at a temperature of 230°C and under a load of 3.8kg is at least 5g / 10mins.

Description

technical field [0001] The present invention relates to a methacrylic resin composition. More specifically, the present invention relates to a thin-walled and large-area molded article capable of producing less coloring, high transparency, low haze, high impact strength, low saturated water absorption, small dimensional change, and good appearance with high production efficiency. Methacrylic resin composition. Background technique [0002] Methacrylic resins are excellent in transparency, light resistance, surface hardness, and the like. Various optical members such as a light guide plate and a lens can be obtained by molding a methacrylic resin composition containing the methacrylic resin. [0003] In recent years, demand for lightweight and large-area liquid crystal display devices has increased, and accordingly, optical members have also been required to be thinner and larger. In addition, on the other hand, along with the high image quality of display devices, high pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/00C08L33/10
CPCC08L33/10C08F220/14C08J2333/12C08L33/08C08F220/40C08F220/10C08J5/00
Inventor 小泽宙新村卓郎松村敦中原淳裕
Owner KURARAY CO LTD
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