GB621784A - Manufacture of polyvinyl acetal resins - Google Patents

Manufacture of polyvinyl acetal resins

Info

Publication number
GB621784A
GB621784A GB19951/45A GB1995145A GB621784A GB 621784 A GB621784 A GB 621784A GB 19951/45 A GB19951/45 A GB 19951/45A GB 1995145 A GB1995145 A GB 1995145A GB 621784 A GB621784 A GB 621784A
Authority
GB
United Kingdom
Prior art keywords
acid catalyst
polyvinyl
ester
polyvinyl ester
hydrolysis
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
GB19951/45A
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.)
Shawinigan Chemicals Ltd
Original Assignee
Shawinigan Chemicals Ltd
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 Shawinigan Chemicals Ltd filed Critical Shawinigan Chemicals Ltd
Publication of GB621784A publication Critical patent/GB621784A/en
Expired 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
    • C08F8/28—Condensation 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 acetal resins having 9-30 per cent residual polyvinyl alcohol are made by adding with vigorous agitation one or more aldehydes containing at least two carbon atoms to a preponderantly aqueous solution of a polyvinyl ester hydrolysed to at least 75 per cent, containing all of the hydrolysed ester to be reacted, in presence of an acid catalyst and absence of a dispersing agent, other than a colloid capable of being converted into the acetal being produced, at below 45 DEG C., continuing agitation while a partially acetalized resin is precipitated, and then maintaining or raising the temperature while continuing agitation until the desired composition of product is obtained. The hydrolysis of the polyvinyl ester may be carried out in presence of an acid catalyst, preferably the same as that used in the acetalization, and is preferably effected within the range 40 DEG to 70 DEG C. Acid corresponding to the polyvinyl ester used may be added to the dispersion before or with the acid catalyst. The hydrolysis of the polyvinyl ester may be carried out continuously by hydrolysing in presence of an acid catalyst to an intermediate stage, replacing part of the solution by further polyvinyl ester dispersion and acid catalyst, repeating the cycle of operations, diluting successive portions of solution removed with water and permitting hydrolysis to proceed to at least 75 per cent, using the same acid catalyst as used in the acetalization. The polyvinyl ester dispersion used may be in the form of beads, flakes or powder of polymer, dispersed in water or produced by polymerization of the monomer in aqueous emulsion. If desired, the acetalized product may be washed with water and then at elevated temperatures, e.g. 70-95 DEG C., with aqueous sodium or potassium hydroxide. Specified aldehydes are acetaldehyde, paraldehyde, butyraldehyde, propionaldehyde and benzaldehyde. Polyvinyl acetate is the preferred ester. Specification 577,861 is referred to.
GB19951/45A 1944-08-19 1945-08-03 Manufacture of polyvinyl acetal resins Expired GB621784A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA621784X 1944-08-19

Publications (1)

Publication Number Publication Date
GB621784A true GB621784A (en) 1949-04-20

Family

ID=4171984

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19951/45A Expired GB621784A (en) 1944-08-19 1945-08-03 Manufacture of polyvinyl acetal resins

Country Status (1)

Country Link
GB (1) GB621784A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2365005A1 (en) * 1972-12-30 1974-07-11 Sekisui Chemical Co Ltd METHOD FOR MANUFACTURING POLYVINYL ACETALS
DE2838025A1 (en) * 1977-08-31 1979-03-15 Saint Gobain METHOD OF MANUFACTURING POLYVINYLBUTYRAL AND ITS APPLICATION
US4652604A (en) * 1985-08-02 1987-03-24 American Hoechst Corporation Radiation-polymerizable composition and element containing a photopolymer composition
US4670507A (en) * 1985-08-02 1987-06-02 American Hoechst Corporation Resin
US4707437A (en) * 1985-08-02 1987-11-17 Hoechst Celanese Corporation Radiation-polymerizable composition and element containing a photopolymer composition
US4780392A (en) * 1985-08-02 1988-10-25 Hoechst Celanese Corporation Radiation-polymerizable composition and element containing a photopolymerizable acrylic monomer
US4822720A (en) * 1985-08-02 1989-04-18 Hoechst Celanese Corporation Water developable screen printing composition
US4895788A (en) * 1985-08-02 1990-01-23 Hoechst Celanese Corporation Water developable lithographic composition

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2365005A1 (en) * 1972-12-30 1974-07-11 Sekisui Chemical Co Ltd METHOD FOR MANUFACTURING POLYVINYL ACETALS
DE2838025A1 (en) * 1977-08-31 1979-03-15 Saint Gobain METHOD OF MANUFACTURING POLYVINYLBUTYRAL AND ITS APPLICATION
US4652604A (en) * 1985-08-02 1987-03-24 American Hoechst Corporation Radiation-polymerizable composition and element containing a photopolymer composition
US4670507A (en) * 1985-08-02 1987-06-02 American Hoechst Corporation Resin
US4707437A (en) * 1985-08-02 1987-11-17 Hoechst Celanese Corporation Radiation-polymerizable composition and element containing a photopolymer composition
US4780392A (en) * 1985-08-02 1988-10-25 Hoechst Celanese Corporation Radiation-polymerizable composition and element containing a photopolymerizable acrylic monomer
US4822720A (en) * 1985-08-02 1989-04-18 Hoechst Celanese Corporation Water developable screen printing composition
US4895788A (en) * 1985-08-02 1990-01-23 Hoechst Celanese Corporation Water developable lithographic composition

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