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Process for producing phenoxyphosphazene compound, flame- retardant resin composition, and flame-retardant resin molding

a technology of phenoxyphosphazene and resin, which is applied in the direction of organic chemistry, chemistry apparatus and processes, group 5/15 element organic compounds, etc., can solve the problems of discoloration of synthetic resins, deterioration of heat resistance, and serious drawbacks of phenoxyphosphazene compounds, so as to reduce mechanical characteristics, reduce molecular weight, and change the hue

Inactive Publication Date: 2003-02-27
OTSUKA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0121] When added to a synthetic resin, the phenoxyphosphazene compound prepared by the process of the present invention is unlikely to adversely affect the hue (transparency, whiteness, etc.), heat resistance, weathering resistance, chemical resistance, etc., of the synthetic resin.[0122] Especially, when added to a polycarbonate resin or a mixture of a polycarbonate resin and another resin, the phenoxyphosphazene compound prepared by the process of the present invention prevents the polycarbonate resin from decomposition and a decrease in molecular weight, and hardly changes the hue or reduces mechanical characteristics such as impact resistance or other characteristics inherent in the resin such as heat resistance, molding processability, etc.[0123] In addition, a phenoxyphosphazene compound prepared by the process of the present invention has a higher quality, hydrolysis resistance, corrosion resistance, discoloration resistance, etc., and less odor than a phenoxyphosphazene compound washed with an aqueous solution containing an acid or an alkali. A resin composition prepared by adding the phenoxyphosphazene compound of the invention to a synthetic resin can endure severe long-term storage conditions and when molded does not corrode the molding device by which it is molded or cause other problems.[0124] The reason why the present invention can achieve such excellent results not yet fully clarified. However, one of the reasons may be as follows: the treatment of the present invention may efficiently remove or inactivate a trace amount of unreacted materials and impurities having phosphorus residues, amino groups or other groups, etc., which are formed by side reactions during the synthesis of the phenoxyphosphazene compound and adversely affect the properties of the synthetic resin.[0125] The present invention will be described below in more detail with reference to Examples and Comparative Examples. In the following description, "parts" and "%" mean "weight parts" and "weight %", respectively, unless otherwise specified.

Problems solved by technology

However, phenoxyphosphazene compounds have a serious drawback: they discolor synthetic resins when added thereto.
In addition, the addition of a phenoxyphosphazene compound to a synthetic resin may deteriorate the heat resistance, weathering resistance, discoloration resistance, chemical resistance and other properties of the synthetic resin in long-term storage, although such deterioration may not be evident shortly after the addition.
Inevitably, this results in greatly lowered transparency, change in hue such as whiteness, etc., of the polycarbonate resins.
However, such washing treatment cannot satisfactorily mitigate the above-mentioned drawbacks of phenoxyphosphazene compounds.
Further, when a molding is produced from the resin composition prepared by adding the phenoxyphosphazene compound washed with the aqueous acid solution or aqueous alkaline solution to a synthetic resin, it corrodes the molding device.

Method used

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  • Process for producing phenoxyphosphazene compound, flame- retardant resin composition, and flame-retardant resin molding
  • Process for producing phenoxyphosphazene compound, flame- retardant resin composition, and flame-retardant resin molding
  • Process for producing phenoxyphosphazene compound, flame- retardant resin composition, and flame-retardant resin molding

Examples

Experimental program
Comparison scheme
Effect test

example 2

Synthesis of phenoxyphosphazene compound having p-phenylene-crosslinked structure

[0136] A solvent-free melt was prepared in the same manner as in Example 1. The melt was then dissolved in a mixed solvent of 1.0 liter of tetrahydrofuran and 0.1 liter of methanol. After addition of 21 g of sodium borohydride, the mixture was stirred at room temperature for 24 hours.

[0137] After the reaction was completed, the reaction mixture was neutralized with 2.5% hydrochloric acid and the organic layer was concentrated under reduced pressure. The solid was dissolved in 1.0 liter of toluene and washed twice with a 2.5% aqueous solution of sodium hydroxide, once with 2.5% hydrochloric acid, once with a 5% aqueous solution of sodium hydrogencarbonate, and twice with a 2% aqueous solution of sodium sulfate. The organic layer was concentrated under reduced pressure. The resulting product was heated and vacuum dried at 80.degree. C. at a pressure of 4 hPa or less for 11 hours, giving 202 g of a white s...

example 3

Synthesis of phenoxyphosphazene compound having 2,2-bis(p-oxyphenyl)isopro-pyridene-crosslinked structure

[0151] 65.9 g (0.7 moles) of phenol and 500 ml of toluene were placed in a 1-liter, 4-necked flask. While stirring the mixture and maintaining the internal temperature at 25.degree. C., 14.9 g (0.65 gram atoms) of finely cut metallic sodium were added. After completion of the addition, stirring was continued for 8 hours at 77.degree. C. to 113.degree. C. until the metallic sodium was completely consumed.

[0152] In parallel with the above reaction, 57.1 g (0.25 moles) of bisphenol-A, 103.5 g (1.1 moles) of phenol and 800 ml of THF were placed in a 3-liter, 4-necked flask. While stirring the mixture and maintaining the internal temperature at 25.degree. C., 11.1 g (1.6 gram atoms) of finely cut metallic lithium were added. After completion of the addition, stirring was continued for 8 hours at 61.degree. C. to 68.degree. C. until the metallic lithium was completely consumed. While s...

example 4

Synthesis of phenoxyphosphazene compound having 2,2-bis(p-oxyphenyl)isopro-pyridene-crosslinked structure

[0159] A phenoxyphosphazene compound was prepared in the same manner as in Example 3 except for the following differences in the production process:

[0160] (a) after completion of the reaction, the reaction mixture was concentrated to remove THF and 1 liter of toluene was added;

[0161] (b) the toluene solution was then washed three times with 0.5 liters of a 5% aqueous solution of sodium thiosulfate and three times with a 2% aqueous solution of sodium sulfate and the organic layer was concentrated under reduced pressure; and

[0162] (c) the resulting product was heated and vacuum dried at 80.degree. C. at a pressure of 4 hPa or less for 11 hours. As a result, 220 g of a white solid was obtained

[0163] The crosslinked phenoxyphosphazene compound thus obtained had an acid value of 0.008 mgKOH / g and a hydrolyzable chlorine content of 0.03%. The final product had a composition of [N.dbd.P...

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Abstract

The phenoxyphosphazene compound of the present invention is prepared by treating a phenoxyphosphazene compound with (a) at least one adsorbent selected from activated carbon, silica gel, activated alumina, activated clay, synthetic zeolite and macromolecular adsorbents, (b) at least one reagent selected from metal hydrides, hydrazine, hypochlorites, thiosulfates, dialkyl sulfuric acids, ortho esters, diazoalkanes, lactones, alkanesultones, epoxy compounds and hydrogen peroxide or (c) both the adsorbent and reagent. Incorporation of the phenoxyphosphazene compound prepared by the process of the invention into a synthetic resin achives the following advantages: the synthetic resin can be prevented from discoloration; when the resultant resin composition is stored for a long time, the properties of the synthetic resin, such as heat resistance, weatherability, resistance to discoloration and chemical resistance are not deteriorated; and the resin composition gives a resin composition molded article excellent in properties such as flame retardancy, thermal stability, and moldability.

Description

[0001] The present invention relates to a process for the preparation of phenoxyphosphazene compounds, flame-retardant resin compositions and flame-retardant resin molded articles.[0002] Phenoxyphosphazene compounds are the oligomers or polymers which are prepared by reacting a dichlorophosphazene compound with an alkali metal salt of a phenol compound. The use of these compounds as additives, modifiers, etc., for synthetic resins has been heretofore studied.[0003] Phenoxyphosphazene compounds can impart high flame retardancy, thermal stability, molding processability and other properties to synthetic resins. However, phenoxyphosphazene compounds have a serious drawback: they discolor synthetic resins when added thereto.[0004] In addition, the addition of a phenoxyphosphazene compound to a synthetic resin may deteriorate the heat resistance, weathering resistance, discoloration resistance, chemical resistance and other properties of the synthetic resin in long-term storage, although...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07F9/6581C08J5/00C07F9/659C08G79/04C08K5/5399C08K9/00C08L101/00C09K21/12
CPCC07F9/65812C08K5/5399C09K21/12C07F9/24
Inventor NAKANO, SHINJITADA, YUJIYABUHARA, TADAOKAMESHIMA, TAKASHINISHIOKA, YOICHITAKASE, HIROYUKI
Owner OTSUKA CHEM CO LTD
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