GB1052937A - - Google Patents

Info

Publication number
GB1052937A
GB1052937A GB1052937DA GB1052937A GB 1052937 A GB1052937 A GB 1052937A GB 1052937D A GB1052937D A GB 1052937DA GB 1052937 A GB1052937 A GB 1052937A
Authority
GB
United Kingdom
Prior art keywords
polyvinyl
hydrolysis
degree
saponification
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Publication of GB1052937A publication Critical patent/GB1052937A/en
Active legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/12—Hydrolysis

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

1,052,937. Polyvinyl alcohol. MINISTERUL INDUSTRIEI PETROLULUISI CHIMIEI. Oct. 21, 1963 [Oct. 22, 1962], No. 41420/63. Heading C3P. Partially hydrolysed polyvinyl esters of predetermined degree of hydrolysis by alkaline saponification of polyvinyl carboxylic acid esters in liquid media, are prepared by a process which comprises treating the polyvinyl ester in the presence of water with a material providing alkali metal ions after predetermining the ratio between the alkali metal and the water to predetermine the degree of hydrolysis of the polyvinyl ester, and allowing the saponification to continue until it ceases spontaneously. The polyvinyl ester may be polyvinyl acetate, the liquid medium may be methanol and the sodium ions may be provided by sodium methylate. The treatment may be effected at elevated temperature, and the degree of hydrolysis may be determined during treatment by testing samples by colorimetric analysis, e.g. using iodine and boric acid. After saponification has ceased spontaneously the degree of hydrolysis may be fixed for the recovery stage by adding water or aqueous acetic acid.
GB1052937D 1963-10-22 Active GB1052937A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR951365A FR1383017A (en) 1963-10-22 1963-10-22 Process for obtaining partially hydrolyzed polyvinyl alcohol

Publications (1)

Publication Number Publication Date
GB1052937A true GB1052937A (en)

Family

ID=8814892

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1052937D Active GB1052937A (en) 1963-10-22

Country Status (3)

Country Link
BE (1) BE639011A (en)
FR (1) FR1383017A (en)
GB (1) GB1052937A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1380600A1 (en) * 2002-07-11 2004-01-14 Kuraray Co., Ltd. Polyvinyl alcohol and method for producing polyvinyl alcohol

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1380600A1 (en) * 2002-07-11 2004-01-14 Kuraray Co., Ltd. Polyvinyl alcohol and method for producing polyvinyl alcohol
US6962955B2 (en) 2002-07-11 2005-11-08 Kuraray Co., Ltd. Vinyl alcohol polymer and process for producing vinyl alcohol polymer

Also Published As

Publication number Publication date
FR1383017A (en) 1964-12-24
BE639011A (en)

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