Novel cyanate ester compound, flame-retardant resin composition, and cured product thereof

a technology of cyanate ester and resin, which is applied in the direction of insulating substrate metal adhesion improvement, instruments, water absorption, etc., can solve the problems of increasing physical properties required as a functional polymer material, increasing the number of times, and reducing the number of times. , to achieve the effect of low dielectric constant, excellent flame retardancy and low cos

Inactive Publication Date: 2005-08-18
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0022] The cyanate ester of the present invention is capable of giving a cured product excellent in flame retardancy and has a low dielectric constant, a low dielectric loss tangent and a high glass transition temperature. For this reason, it is remarkably useful as a high function polymer material and can be used as a thermally and electrically excellent material for wide applications such as an electrical insulating material, an adhesive, a laminating material, a resist and a buildup laminate material.

Problems solved by technology

However, in recent years, as higher performances are required in their application fields, physical properties required as a functional polymer material become severer increasingly.
So far, these required properties have not completely satisfied.
However, when such a compound is incorporated in a large amount, heat resistance, moisture resistance, water absorptivity, etc., decrease in many cases.
However, the phosphorus compounds also have a toxic problem.
However, the nitrogen compound is insufficient in flame resistance when it is used alone.
However, there is apprehension that the incorporation of the metal hydroxide causes a decrease in dielectric characteristics, heat resistance, impact resistance or moldability.
Further, when an inorganic filler such as a spherical fused silica is used in a large amount for decreasing a combustible component and securing flame retardancy, as is used for an epoxy resin, the melt viscosity of a molding material rises, a deterioration in moldability occurs, a decrease in adhesive strength occurs because of a decrease in wettability to a base material, or a deterioration in dielectric characteristics occurs, in some cases.
Further, antimony type flame retardants such as antimony trioxide, which are widely used in combination with a brominated epoxy resin, have a problem such as an apprehension of chronic toxicity since they are toxic substances.
However, an aromatic monofunctional cyanate ester having bromine as a functional group is essential for the maintenance of flame retardancy, so that JP-A-6-122763 does not succeeds in improving the flame retardancy with the cyanate ester resin alone.
However, none of them teach a cured product formed of a cyanate ester compound alone which product practically has all of low dielectric characteristics, flame retardancy and heat resistance.

Method used

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  • Novel cyanate ester compound, flame-retardant resin composition, and cured product thereof
  • Novel cyanate ester compound, flame-retardant resin composition, and cured product thereof
  • Novel cyanate ester compound, flame-retardant resin composition, and cured product thereof

Examples

Experimental program
Comparison scheme
Effect test

example a1

Synthesis of Cyanate Ester of Biphenyl Novolak (Formula (9): to be Referred to as “G65C”)

[0057]

[0058] Biphenyl novolak having 1.1 mol of OH groups (supplied by Nippon Kayaku Co., Ltd., KAYAHARD-GPHG65) and 1.6 mol of triethylamine were dissolved in 900 ml of 3-methyltetrahydrofuran, to obtain a solution 1. The solution 1 was dropwise added to 2,500 g of a methylene chloride solution of 2.2 mol of cyanogen chloride at −10° C. over 1.5 hours. The mixture was stirred for 30 minutes. Then, a mixed solution of 0.4 mol of triethylamine and 100 g of methylene chloride was dropwise added, and the resultant mixture was further stirred for 30 minutes to complete the reaction. A hydrochloride of triethylamine was separated by filtration. The thus-obtained filtrate was washed with 1,000 ml of 0.1 N hydrochloric acid, and then washing with 1,000 ml of water was repeated four times. After drying with sodium sulfate, evaporation was carried out at 75° C., to obtain a crystal of a yellow solid. Th...

example b1-1

Production of Cured Product

[0059] The cyanate ester G65C of biphenyl novolak obtained in Example 1 in an amount shown in Table 1 was added in a short-neck flask. The cyanate ester G65C was molten under heat at 150° C. and degassed with a vacuum pump. Then, zinc octylate was added and the resultant mixture was stirred for 1 minute. The stirred mixture was casted in a mold composed of a glass plate (120 mm×120 mm×5 mmt), a polyimide film (Kapton 200H: DU PONT-TORAY CO., LTD.) and an O-ring made of fluoro rubber (S-100: MORISEI Co., Ltd.), and it was cured by heating in an oven at 170° C. for 1 hour and at 230° C. for 9 hours. After cooling, the polyimide film was removed by polishing to obtain a cured product of cyanate ester compound.

[0060] The obtained cured product was evaluated for properties by the following methods.

[0061] Glass transition temperature (Tg): Obtained according to a dynamic viscoelasticity measurement (DMA). The measurement was carried out at an oscillation freq...

example b1-2

[0065] A cured product was obtained in the same manner as in Example B1-1 except that 50 parts by weight of the G65C obtained in Example 1 and 50 parts by weight of bisphenol A dicyanate Skylex, supplied by Mitsubishi Gas Chemical Company, Inc., were used.

[0066] Table 1 shows the evaluation results of physical properties of the cured product.

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Abstract

A cyanate ester compound represented by the formula (1),
    • wherein Ar2 represents a phenylene group, a naphthylene group or a biphenylene group, Ar1 represents a naphthylene group or a biphenylene group when Ar2 is a phenylene group, or Ar1 represents a phenylene group, a naphthylene group or a biphenylene group when Ar2 is a naphthylene group or a biphenylene group, Rx represents all substituents of Ar1 each Rx is the same or different and represents hydrogen, an alkyl group or an aryl group, Ry represents all substituents of Ar2, each Ry is the same or different and represents hydrogen, an alkyl group or an aryl group, and n is an integer of 1 to 50.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a novel cyanate ester compound, a thermosetting resin composition containing the above compound and a cured product thereof. The cyanate ester compound of the present invention can provide a polymer material excellent in flame resistance, heat resistance and low dielectric characteristics by polymerizing the cyanate ester compound itself or copolymerizing the cyanate ester compound with another resin. Such a thermosetting resin composition can be widely used for applications such as an electrical insulating material, a resin for a resist, a semiconductor-sealing resin, an adhesive for a printed wiring board, a matrix resin for a laminate or a prepreg used for electrical devices, a buildup laminate material, a resin for a fiber-reinforced plastic, a sealing resin for a liquid crystal display panel, a resin for a color filter of liquid crystal, a coating composition, various coating agents and an adhesive. PRIOR ARTS OF TH...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07C261/02C08G73/06C08K5/205C08K5/29C09D5/18C09K21/14G02F1/1339H05K1/03H05K3/38
CPCC07C261/02C08G73/0655C08K5/29H05K3/386C09K21/14G02F1/1339H05K1/0346C09D5/18Y10T428/31699
Inventor SUGANO, YUUICHIKATAGIRI, MASAYUKIOHNO, DAISUKEKITA, SEIJISHIMA, YOSHIKAZU
Owner MITSUBISHI GAS CHEM CO INC
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