Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
  • C07C303/42—Separation; Purification; Stabilisation; Use of additives
  • C07C303/44—Separation; Purification
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
  • C07C51/41—Preparation of salts of carboxylic acids
  • C07C51/412—Preparation of salts of carboxylic acids by conversion of the acids, their salts, esters or anhydrides with the same carboxylic acid part
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
  • C07C51/42—Separation; Purification; Stabilisation; Use of additives
  • C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
  • C07C51/44—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
  • C07C51/42—Separation; Purification; Stabilisation; Use of additives
  • C07C51/50—Use of additives, e.g. for stabilisation
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C57/00—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms
  • C07C57/02—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms with only carbon-to-carbon double bonds as unsaturation
  • C07C57/03—Monocarboxylic acids
  • C07C57/04—Acrylic acid; Methacrylic acid

Definitions

• the present invention relates to a novel method for producing a metal salt of a radically polymerizable compound having a low water content.
• Metal salts of radically polymerizable compounds such as sodium methacrylate, potassium methacrylate, sodium acrylate, and acrylic acrylate are prepared by adding the corresponding radically polymerizable compound in an aqueous solution of an alkali metal compound. It is manufactured by summing.
• a metal salt having a small water content from an aqueous solution of a metal salt of such a radical polymerizable compound. Numerous methods have been tried in the past to solve such problems.
• a method of azeotropically dehydrating an aqueous solution of a metal salt of this type of radically polymerizable compound in the presence of an organic solvent such as toluene has been attempted.
• a metal salt of a radically polymerizable compound causes a polymerization reaction during azeotropic dehydration, and a highly pure metal salt of a radically polymerizable compound was not obtained.
• a method of coexisting a compound known as a polymerization inhibitor for radically polymerizable compounds such as hydroquinone, methoxyhydroquinone, phenothiazine, and hindered phenols has also been attempted. .
• these compounds are all fat-soluble, their solubility in water is low, and they do not prevent the polymerization of radically polymerizable compounds. Therefore, high purity metal salts of radically polymerizable compounds can be used.
• a metal salt of a radically polymerizable compound causes a polymerization reaction during
• an object of the present invention is to provide a method capable of producing a metal salt of a radically polymerizable compound having a low water content and a high purity in a high yield.
• R 1 one CH CR 2 - R 3 _S0 3 H (wherein, RR 2 and R 3 are the same as defined above, and.) the group consisting of compounds represented by An aqueous solution of an alkali metal salt, an alkaline earth metal salt or a zinc salt of a radical polymerizable compound selected from the group consisting of (B) a water-soluble polymerization inhibitor is heated under reduced pressure to obtain A) Make sure that water in the ingredients is distilled off. .
• R 1 - CH CR 2 - COOH (wherein, R 1 is a hydrogen atom, an alkyl group, or a phenyl group, and R 2 is a methyl group or a hydrogen atom.)
• R 1 -CH CR 2 -R 3 ⁇ COOH (Wherein, R 1 and R 2 are the same as above, and R 3 is a phenylene group.)
• R 1 -CH CR 2 -S 0 3 H ( in the formula, R 1 and R 2 are the same as the above compound represented by), the general formula (4):.
• R 1 -CH CR 2 -R 3 -S0 3 H ( in the formula, R 1 R 2 and R 3 are the same as those described above.)
• B water-soluble polymerization inhibitor
• an alkali metal salt, an earth metal salt or a zinc salt of a radically polymerizable compound having a low water content and a high purity can be obtained at a high yield.
• no radical polymerization occurs during production.
• R 1 is a hydrogen atom, an alkyl group such as a methyl group, an ethyl group or a propyl group, or a phenyl group. Among them, a hydrogen atom or a phenyl group is preferable, and a hydrogen atom is particularly preferable.
• R 2 is a methyl group or a hydrogen atom, and R 3 is a phenyl group.
• Examples of such a compound include methacrylic acid, acrylic acid, cinnamic acid, o-bierbenzenesulfonic acid, p-vinylbenzene snolefonic acid, p-vinylbenzoic acid and derivatives thereof.
• the component (A) is an aqueous solution of an alkali metal salt, an alkali metal earth salt or a zinc salt of the above-described radically polymerizable compound.
• Examples include lithium, sodium, potassium, and rubidium. Of these, sodium and potassium are preferred.
• Magnesium is an alkaline earth metal , Chromium, strontium, norium. Of these, magnesium and calcium are preferred.
• Metal salts of such radically polymerizable compounds include sodium methacrylate, potassium methacrylate, calcium methacrylate, magnesium methacrylate, zinc methacrylate, sodium acrylate, potassium acrylate, magnesium acrylate, and acrylic acid.
• Examples include sodium vinylinoleate benzenesulfonate and ⁇ _vinylbenzenesulfonate potassium.
• Such an aqueous solution of a metal salt of a radically polymerizable compound is prepared by mixing the above-mentioned radically polymerizable compound with the above-mentioned alkali metal salt, alkaline earth metal salt or zinc salt.
• the water-soluble polymerization inhibitor is a component that is a feature of the present invention.
• Such (II) components include L-ascorbic acid (vitamin C), sodium L-ascorbate, erythorbic acid, sodium erysorbate, and derivatives thereof; phenylhydroxylamine and its derivatives. 3,5-di-t-butyl-14-hydroxyaline and its salts (eg, hydrochloride); 3,5-di-t-butyl-4-hydroxy-phosphoric acid; 3,5-di-t-butyl-4-hydroxybenzoic acid Its salt (for example, sodium salt) is exemplified.
• L-ascorbic acid (vitamine C) and N-phenylhydroxylamine or N-phenylhydroxylamine hydrochloride are preferred.
• L-ascorbic acid (vitamin C) power S is available at low cost. This is preferable because it is possible, has almost no toxicity, and can extremely effectively prevent polymerization of the radically polymerizable compound.
• the amount of the component (B) is determined by the amount of the radical polymerizable compound in the component (A). It is an amount capable of preventing polymerization of a potassium metal salt, an alkaline earth metal salt or a zinc salt, and is usually an alkali metal salt, an alkaline earth metal salt or an alkali metal salt of a radical polymerizable compound in the component (A). It is in the range of 0.001 to 0.1 part by weight based on 100 parts by weight of the zinc salt.
• the component (B) may be added at the stage of synthesizing the component (A), or may be added after synthesizing the component (A). Generally, it is preferable to add the syrup at the stage of synthesizing the component (A) because the operation can be simplified.
• the component (A) as described above is heated under reduced pressure in the presence of the component (B), and water in the component (A) is distilled off.
• an organic solvent such as toluene, xylene, heptane or octane may be added to the component (A) and the component (B) in advance and heated to distill off water in the component (A).
• an azeotropic dehydration can be performed by adding an organic solvent. If a device such as a mixer dryer that supports stirring of powder is used as the reaction device, dehydration can be completed without adding an organic solvent.
• the water content is 5% by weight or less, preferably the water content is 0.5% by weight or less, more preferably 0% by weight or less. . 2 weight. / 0 or less, and a highly pure radically polymerizable compound that is substantially free of moisture, and is obtained in a high yield.
• the alkali metal salt, alkalinity metal salt or zinc salt of the radically polymerizable compound produced by the production method of the present invention as described above has a small water content and a high purity. Has features. Therefore, taking advantage of such characteristics, it is useful as an intermediate material used for a reaction with a water-unstable organic compound. Further, it is useful as it is as an additive for modifying physical properties of an organic resin.
• a mixture of 284 g (3.30 mol) of methacrylic acid, 280 g of water, and 3,5-di-t-butyl-14-hydroxydiphosphoric acid hydrochloride was mixed with a 48% by weight aqueous solution of a hydrating water.
• the resulting mixture was mixed to prepare an aqueous solution of methacrylic acid-based lime.
• This aqueous solution was charged into a mixer dryer, and while heating at 60 ° C., the pressure was reduced to 2 Omm Hg to distill off water.
• the water content in this potassium methacrylate was 0.05% by weight or less. This water content measurement is based on the measurement of the amount of distilled water. And was measured by The yield of this potassium methacrylate was 97%. It should be noted that, in this reaction, formation of a polymer due to methacrylic acid was not confirmed.
• a mixture of 859 g of sodium vinyl sulfonate aqueous solution (A1drich, 25 wt./. Aqueous solution, 1.65 mol as sodium vinyl sulfonate) and 30 Omg of L-ascorbic acid (vitamin C) was charged into a mixer dryer. The pressure was reduced to 10 mmHg while heating at 50 ° C to distill off water. The water content in this sodium sulfosulfonate was 0.05% by weight or less. This water content was measured by measuring the amount of distilled water. The yield of sodium sodium sulfonate was 96%. In this reaction, formation of a polymer due to butyl sulfonic acid was not confirmed.
• Example 2 Potassium methacrylate was produced in the same manner as in Example 2 except that 50 mg of 2,6-di-tert-butyl-4-methylphenol (BHT) was used instead of L-ascorbic acid. However, during the dehydration, BHT is distilled out together with water, and in the process of azeotropic dehydration, a viscous polymer is formed in the reaction system, which makes stirring difficult, so that the desired potassium methacrylate can be produced. could not.
• BHT 2,6-di-tert-butyl-4-methylphenol

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• Chemical & Material Sciences (AREA)
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• Engineering & Computer Science (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Crystallography & Structural Chemistry (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
• Materials For Medical Uses (AREA)

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• 2002
  • 2002-02-19 JP JP2002040904A patent/JP4204792B2/ja not_active Expired - Fee Related
• 2003
  • 2003-02-19 AU AU2003207095A patent/AU2003207095A1/en not_active Abandoned
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