公开(公告)号：DE69128009D1

公开(公告)日：1997-11-27

申请号：DE69128009

申请日：1991-08-19

Applicant: TOSOH CORP

Inventor： EGUCHI HISAO ,  KUBO MASASHIGE ,  NAGASAKI NORITAKA ,  KUNIMOTO KOJI

IPC: C07C37/62 ,  C07C39/367

Abstract: A process for producing tetrabromobisphenol A of high quality, which comprises brominating bisphenol A with bromine, wherein a solvent mixture comprising a hydrohalogenic acid and an alcohol, is used as the solvent for reaction. Also disclosed is a process for producing tetrabromobisphenol A of high quality, which comprises brominating bisphenol A with bromine in an alcohol, wherein the reaction temperature is set at a level of from -10 to +20 DEG C, and water is added in an aging step.

公开(公告)号：DE69008373T2

公开(公告)日：1994-08-18

申请号：DE69008373

申请日：1990-01-26

Applicant: TOSOH CORP

Inventor： KUBO MASASHIGE ,  KUNIMOTO KOJI ,  TAMABAYASHI HANZO ,  SATO MASAKATSU ,  SHIMIZU SADAMI ,  EGUCHI HISAO

IPC: C07C37/62 ,  C07C39/367

Abstract: A process for producing tetrabromobisphenol A, which comprises brominating bisphenol A in methanol, wherein the substrate concentration of bisphenol A to methanol is at most 20 wt/vol%.

公开(公告)号：DE69133291D1

公开(公告)日：2003-08-07

申请号：DE69133291

申请日：1991-08-19

Applicant: TOSOH CORP

Inventor： EGUCHI HISAO ,  KUBO MASASHIGE ,  NAGASAKI NORITAKA ,  KUNIMOTO KOJI

IPC: C07C37/62 ,  C07C39/367

Abstract: A process for producing tetrabromobisphenol A of high quality, which comprises brominating bisphenol A with bromine, wherein a solvent mixture comprising a hydrohalogenic acid and an alcohol, is used as the solvent for reaction. Also disclosed is a process for producing tetrabromobisphenol A of high quality, which comprises brominating bisphenol A with bromine in an alcohol, wherein the reaction temperature is set at a level of from -10 to +20 DEG C, and water is added in an aging step.

公开(公告)号：DE69128009T2

公开(公告)日：1998-02-26

申请号：DE69128009

申请日：1991-08-19

Applicant: TOSOH CORP

Inventor： EGUCHI HISAO ,  KUBO MASASHIGE ,  NAGASAKI NORITAKA ,  KUNIMOTO KOJI

IPC: C07C37/62 ,  C07C39/367

Abstract: A process for producing tetrabromobisphenol A of high quality, which comprises brominating bisphenol A with bromine, wherein a solvent mixture comprising a hydrohalogenic acid and an alcohol, is used as the solvent for reaction. Also disclosed is a process for producing tetrabromobisphenol A of high quality, which comprises brominating bisphenol A with bromine in an alcohol, wherein the reaction temperature is set at a level of from -10 to +20 DEG C, and water is added in an aging step.

公开(公告)号：DE69133291T2

公开(公告)日：2004-05-13

申请号：DE69133291

申请日：1991-08-19

Applicant: TOSOH CORP

Inventor： EGUCHI HISAO ,  KUBO MASASHIGE ,  NAGASAKI NORITAKA ,  KUNIMOTO KOJI

IPC: C07C37/62 ,  C07C39/367

Abstract: A process for producing tetrabromobisphenol A of high quality, which comprises brominating bisphenol A with bromine, wherein a solvent mixture comprising a hydrohalogenic acid and an alcohol, is used as the solvent for reaction. Also disclosed is a process for producing tetrabromobisphenol A of high quality, which comprises brominating bisphenol A with bromine in an alcohol, wherein the reaction temperature is set at a level of from -10 to +20 DEG C, and water is added in an aging step.

公开(公告)号：DE69008373D1

公开(公告)日：1994-06-01

申请号：DE69008373

申请日：1990-01-26

Applicant: TOSOH CORP

Inventor： KUBO MASASHIGE ,  KUNIMOTO KOJI ,  TAMABAYASHI HANZO ,  SATO MASAKATSU ,  SHIMIZU SADAMI ,  EGUCHI HISAO

IPC: C07C37/62 ,  C07C39/367

Abstract: A process for producing tetrabromobisphenol A, which comprises brominating bisphenol A in methanol, wherein the substrate concentration of bisphenol A to methanol is at most 20 wt/vol%.

公开(公告)号：JPH03246245A

公开(公告)日：1991-11-01

申请号：JP4120690

申请日：1990-02-23

Applicant: TOSOH CORP

Inventor： EGUCHI HISAO ,  KUBO MASAJI ,  KUNIMOTO KOJI

IPC: C07C37/62 ,  C07C37/84 ,  C07C39/367

Abstract: PURPOSE:To obtain the objective high-quality compound by adding water to a reaction solution after completing brominating reaction and crystallizing the objective compound in brominating bisphenol A with bromine in a methanolic solvent and producing the subject compound. CONSTITUTION:Bisphenol A is brominated in a methanolic solvent to produce tetrabromobisphenol A useful as a reactive type flame retardant for epoxy resins. In the process, water is added to the reaction solution after completing the brominating reaction to crystallize the objective compound at -15 to +15 deg.C temperature. Thereby, the objective high-quality compound with a remarkably reduced content of hydrolyzable bromine or inorganic bromine ions causing metal corrosion, etc., deterioration in reliability of materials in use thereof as the epoxy resins for electrical and electronic material applications such as especially laminated boards or sealing media is advantageously and industrially obtained in a simplified process without requiring special purifying steps.

公开(公告)号：JPH049346A

公开(公告)日：1992-01-14

申请号：JP10891590

申请日：1990-04-26

Applicant: TOSOH CORP

Inventor： EGUCHI HISAO ,  KUBO MASAJI ,  NAGASAKI YORITAKA ,  KUNIMOTO KOJI

IPC: C07C37/86 ,  C07C37/62 ,  C07C37/84 ,  C07C39/16 ,  C07C39/367

Abstract: PURPOSE:To obtain the title high-quality compound reduced in hydrolyzable bromine and inorganic bromide ion contents by bromination of bisphenol A with bromine followed by adding a specified amount of water at a specified dripping rate to the reaction fluid to effect crystallization. CONSTITUTION:Firstly, bisphenol A is incorporated, in a methanol solvent, with 4.0-4.5 molar times of bromine at 10-30 deg.C for 0.5-10hr to effect bromination followed by aging the system for 0.5-5hr. Thence, 30-100 (pref. 50-85)wt.%, based on the reaction solvent, of water is added to the system at a dripping rate of 5-40 (pref. 10-30)wt.%/hr, thus obtaining the objective high-quality compound containing only 5-50ppm of hydrolyzable bromine and 0-10ppm of inorganic bromide ion. The present compound can be directly used as a flame-retardant for the resins to be used as electrical/electronic materials such as laminates and sealers.

公开(公告)号：JPH03209340A

公开(公告)日：1991-09-12

申请号：JP257690

申请日：1990-01-11

Applicant: TOSOH CORP

Inventor： EGUCHI HISAO ,  KUBO MASAJI ,  KUNIMOTO KOJI

IPC: C07C37/62 ,  C07C39/367

Abstract: PURPOSE:To obtain the subject compound having high quality and decreased content of hydrolyzable bromine and inorganic bromide ion, on an industrial scale at a low cost, by brominating bisphenol A with bromine in methanol while specifying the substrate concentration of the above raw material relative to methanol. CONSTITUTION:Tetrabromobisphenol A useful as a flame-retardant for epoxy resin and ABS resin is produced by brominating bisphenol A with bromine in methanol. In the above process, the substrate concentration of bisphenol A relative to methanol is adjusted to 0.1-10w/v%, preferably 1-8w/v% to obtain the objective compound having high quality. Since the product has remarkably decreased contents of hydrolyzable bromine and inorganic bromine ion, it can be used, without necessitating particular purification process, as a flame- retardant for resin for electrical and electronic use such as laminated sheet or sealant. The compound can be produced on an industrial scale at a low cost with a simplified process compared with conventional process.

公开(公告)号：JPH0632757A

公开(公告)日：1994-02-08

申请号：JP11449393

申请日：1993-05-17

Applicant: TOSOH CORP

Inventor： TAMABAYASHI NORIZO ,  KAKIMOTO SHINJI ,  MIZUI TETSUTO ,  NOMURA AKIHIKO ,  KUNIMOTO KOJI

IPC: C07C37/84 ,  C07C37/62 ,  C07C39/367

Abstract: PURPOSE:To obtain a tetrabromobisphenol A having improved powder properties such as adhesivity, cohesivity and flowability, decreased content of impurities such as hydrolyzable bromine and high thermal stability and to provide a process for producing the compound. CONSTITUTION:The powder properties of the subject compound can be improved by crystallizing the compound in the form of polyhedral single crystal having an average particle diameter of 150-500mum. The crystal can be produced by brominating bisphenol A in an alcoholic solvent, adding water to the system, separating the crystallized tetrabromobisphenol A by filtration, dissolving the crystal in an alcoholic solvent, adding an alkaline aqueous solution and evaporating the alcoholic solvent from the mixture.