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Methacrylic resin and use thereof

A methacrylic acid and resin technology, applied in the field of transparent parts, can solve the problems of poor heat resistance and rigidity that cannot meet the use requirements of screen parts, and achieve the effects of excellent formability, excellent transparency and uniform performance

Inactive Publication Date: 2003-12-24
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another issue is the need for crack resistance as a safety measure or the need for safety from cracked structures
The third issue is being able to freely design the screen shape in the pursuit of attractive display design
However, its heat resistance is still very poor, which needs to be improved
Moreover, its rigidity is also a serious problem
The rigidity of PMMA cannot meet the requirements for the use of screen parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0061] The present invention will be further described in detail with reference to the following examples, but the scope of the present invention is not limited. In the following Examples and Comparative Examples, parts by weight refer to grams.

[0062] (Evaluation method)

[0063] The properties of each resin can be evaluated by the following methods.

[0064] Ease of polymerization: The occurrence and extent of the runaway reaction (wakame phenomenon: the phenomenon that the resin surface becomes like bark and disorder) is inspected by the naked eye with the following standards.

[0065] ○: No occurrence,

[0066] △: Partial occurrence,

[0067] ×: Occurs on all surfaces.

[0068] Heat resistance: TMA analyzer produced by K.K.Rigaku is used to measure T g .

[0069] Impact resistance: 114 grams of steel balls fall on each 2 mm thick resin board, compare the height of the resin board without cracking.

[0070] Surface hardness: Pencil hardness is measured according to Japanese I...

preparation example 1

[0077] 242.8 g of 3-isopropenyl-α,α-dimethylbenzyl isocyanate and 0.12 g of dibutyltin dilaurate were charged into a four-necked flask equipped with a stirrer, thermometer, drying tube, and dropping funnel. At an internal temperature of 45-50°C, 157.0 g of 2-hydroxyethyl methacrylate was dropped into the flask within 2 hours. Thereafter, the aging reaction of the mixture was carried out at 50°C for 8 hours. Thus, compound (1) was obtained.

preparation example 2

[0079] 233.0 g of 3-isopropenyl-α,α-dimethylbenzyl isocyanate and 0.12 g of dibutyltin dilaurate were charged into a four-necked flask equipped with a stirrer, a thermometer, a drying tube, and a dropping funnel. At an internal temperature of 45-50°C, 167.0 g of 2-methyl-1-methacryloyloxyethanol was dropped into the flask within 2 hours. Thereafter, the aging reaction of the mixture was carried out at 50°C for 8 hours. Thus, compound (2) was obtained.

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PUM

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Abstract

A methacrylic resin produced by copolymerizing a composition in the presence of a radical initiator, the composition comprising methyl methacrylate and a specified compound. Further, there are provided transparent members including a transparent member for automobile and a transparent member for display, which are produced by molding the above methacrylic resin. A methacrylic resin which is excellent in transparency, heat resistance, chemical resistance and impact resistance can be produced with high productivity without the occurrence of runaway of polymerization reaction. The transparent members including a transparent member for automobile and a transparentmemberfordisplay, produced by molding the above methacrylic resin, are excellent in properties such as transparency, heat resistance and impact resistance.

Description

Technical field [0001] The present invention relates to a methacrylic resin and a transparent part formed of the methacrylic resin. More specifically, the present invention relates to methacrylic resins made by copolymerizing methyl methacrylate (MMA) with special compounds, and to transparent parts composed of methacrylic resins, including transparent parts for displays and automobiles. Transparent parts. Background technique [0002] Methacrylic resin (PMMA) has excellent transparency, light weight, weather resistance, etc., so it is widely used as window glass materials for vehicles and buildings, signs, housings for measuring instruments, and flat panel displays (FPD). Panel, LCD light control panel, etc. However, methacrylic resin has a disadvantage that it has poor heat resistance and chemical resistance compared to polycarbonate, etc., so its use range is naturally limited. Moreover, methacrylic resins are required to have improved impact resistance depending on the field ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/00C08F212/34C08F220/14C08F220/36
CPCC08F220/36C08F220/14C08F212/34C08F220/343C08F20/06
Inventor 川崎登笹川胜好塩冶昌弘
Owner MITSUI CHEM INC
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