GB856840A - Process for the manufacture of polyvinyl formals - Google Patents

Process for the manufacture of polyvinyl formals

Info

Publication number
GB856840A
GB856840A GB10245/58A GB1024558A GB856840A GB 856840 A GB856840 A GB 856840A GB 10245/58 A GB10245/58 A GB 10245/58A GB 1024558 A GB1024558 A GB 1024558A GB 856840 A GB856840 A GB 856840A
Authority
GB
United Kingdom
Prior art keywords
acid
polyvinyl
acetic acid
mixture
groups
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.)
Expired
Application number
GB10245/58A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wacker Chemie AG
Original Assignee
Wacker Chemie AG
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.)
Filing date
Publication date
Application filed by Wacker Chemie AG filed Critical Wacker Chemie AG
Publication of GB856840A publication Critical patent/GB856840A/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00Chemical modification by after-treatment
    • C08F8/28Condensation with aldehydes or ketones

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

Polyvinyl formals suitable for electrical insulating purposes, are made by reacting a polyvinyl ester with formaldehyde (or a substance yielding formaldehyde) in an aqueous medium containing 75-80% by weight of acetic acid in the presence of a mixture of a strong mineral acid and a salt of persulphuric acid as hydrolysis and acetalisation catalyst. The preferred polyvinyl ester is polyvinyl acetate obtained by polymerization in glacial acetic acid and the preferred catalyst is a mixture of sulphuric acid and ammonium persulphate. Preferably reaction is effected at 70 DEG -80 DEG C. for 20-25 hours, the reaction mixture then diluted with an aqueous solution of acetic acid of 20-25% strength and then water added to precipitate the product. In the example, the product produced contains about 80% of formal groups, 14% of acetate groups and 6% of hydroxyl groups. Specification 454,691 is referred to.
GB10245/58A 1957-03-30 1958-03-31 Process for the manufacture of polyvinyl formals Expired GB856840A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE856840X 1957-03-30

Publications (1)

Publication Number Publication Date
GB856840A true GB856840A (en) 1960-12-21

Family

ID=6789418

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10245/58A Expired GB856840A (en) 1957-03-30 1958-03-31 Process for the manufacture of polyvinyl formals

Country Status (1)

Country Link
GB (1) GB856840A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0319613A1 (en) * 1987-12-07 1989-06-14 METHANOL CHEMIE NEDERLAND V.o.F. A process for preparing polymers and their use as stabilizers for aqueous formaldehyde solutions
EP0319614A1 (en) * 1987-12-07 1989-06-14 METHANOL CHEMIE NEDERLAND V.o.F. New polymers, a process of their preparation and their use as stabilizers of aqueous formaldehyde solutions

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0319613A1 (en) * 1987-12-07 1989-06-14 METHANOL CHEMIE NEDERLAND V.o.F. A process for preparing polymers and their use as stabilizers for aqueous formaldehyde solutions
EP0319614A1 (en) * 1987-12-07 1989-06-14 METHANOL CHEMIE NEDERLAND V.o.F. New polymers, a process of their preparation and their use as stabilizers of aqueous formaldehyde solutions
WO1989005313A1 (en) * 1987-12-07 1989-06-15 Methanol Chemie Nederland V.O.F. New polymers, a process of their preparation and their use as stabilizers of aqueous formaldehyde solutions
WO1989005312A1 (en) * 1987-12-07 1989-06-15 Methanol Chemie Nederland V.O.F. A process for preparing polymers and their use as stabilizers for aqueous formaldehyde solutions

Similar Documents

Publication Publication Date Title
GB912387A (en) A chemically modified starch and method of producing same
GB856840A (en) Process for the manufacture of polyvinyl formals
GB906722A (en) Manufacture of bis (beta-hydroxyethyl) terephthalate
GB821092A (en) Improvements in or relating to the manufacture of polyvinyl acetals
GB656249A (en) Method for preparing soluble allyl starch
GB482731A (en) Improvements in the production of synthetic resins and the manufacture of films or sheets therefrom
GB803060A (en) Process for the production of lactic acid and derivatives
GB999253A (en) Novel unsaturated esters and a process for the preparation thereof
GB591027A (en) 11-amino-undecyclic acid and its method of preparation
GB550854A (en) Improvements in or relating to the manufacture of esters of chlorine containing organic acids
GB811770A (en) Method for hydrolyzing dextran
GB747417A (en) Improvements in or relating to the production of phthalic acids
GB1396754A (en) Process for preparing alpha-keto esters
GB934787A (en) Process for the manufacture of polyvinyl alcohol
GB758676A (en) Process for the manufacture of terephthalic acid
GB1341307A (en) Preparation of a-dithiols
GB616454A (en) Improvements in or relating to the preparation of basic lead salts of 2:4 dinitro resorcinol
GB568113A (en) Process of making methylene-bis-4-hydroxycoumarin
GB906477A (en) Preparation of alcohol from aluminium trialkyls
GB674710A (en) A method of preparing aliphatic acyl hydroxypolycarboxylic acid anhydrides
GB848611A (en) A process for the manufacture of ª‡-chloro-ª‰-amino-carboxylic acid derivatives and novel ª‡-chloro-ª‰-amino-carboxylic acid derivatives
GB763520A (en) Production of substituted pyridines
GB730401A (en) Manufacture of polyvinyl alcohol formacetals containing acetyl groups
ES261630A1 (en) New cyclopentano-naphthalene derivatives and their formation
GB1000488A (en) Method of testing terephthalic acid to be converted into polyethylene terephthalate