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    PRODUCTION OF POLYVINYL ACETAL AND POLYVINYL KETAL
    1.
    发明专利
    PRODUCTION OF POLYVINYL ACETAL AND POLYVINYL KETAL 失效

    公开(公告)号：JPH1036446A

    公开(公告)日：1998-02-10

    申请号：JP11398297

    申请日：1997-05-01

    Applicant: HOECHST AG

    Inventor： FUSS ROBERT W DR ,  GUTWEILER MATTHIAS DR ,  BAUMGARTNER MARTIN DR

    IPC: B01J31/02 ,  B01J31/08 ,  B01J31/10 ,  C08F8/28 ,  C08F16/38

    Abstract: PROBLEM TO BE SOLVED: To obtain a polyvinyl acetal or a polyvinyl ketal continuously at a good efficiency by reacting a polyvinyl alcohol with an aldehyde or a ketone in the presence of a specified catalyst. SOLUTION: An acid selected among sulfonic acids, phosphonic acids and carboxylic acids is chemically combined with a sheety support (e.g. polystyrene film) insoluble in the reaction medium to prepare a catalyst. Next, a polyvinyl alcohol is reacted with an aldehyde (e.g. n-butylaldehyde) or a ketone (e.g. acetone) in the presence of the catalyst to obtain a polyvinyl acetal or a polyvinyl ketal. A desirable example of the reaction method consists of continuously metering and adding a poly(vinyl alcohol) and an aldehyde or a ketone to a preliminary reactor, partially reacting them with each other at 1-70 deg.C in the presence of the catalyst, transferring the reaction mixture to the main reactor and continuously reacting them at 1-80 deg.C in the presence of the catalyst.

    6.
    发明专利
    未知

    公开(公告)号：DE4332114A1

    公开(公告)日：1995-03-23

    申请号：DE4332114

    申请日：1993-09-22

    Applicant: HOECHST AG

    Inventor： GUTWEILER MATTHIAS DR ,  ZIMMERMANN HANS-JUERGEN DR

    IPC: C08L23/12 ,  C08L23/10 ,  C08L29/00 ,  C08L29/04 ,  C08L29/14 ,  C08L21/00 ,  C08L51/06

    Abstract: Mouldings produced by thermoforming a polypropylene moulding composition containing polypropylene or ethylene-propylene copolymers and polyvinylbutyral of the formula have considerable advantages over mouldings made from a polypropylene moulding composition containing no PVB since they have greater surface tension and can therefore be painted, printed, inscribed and laminated without problems without further pretreatment of the surface.

    7.
    发明专利
    未知

    公开(公告)号：AT149180T

    公开(公告)日：1997-03-15

    申请号：AT92116756

    申请日：1992-09-30

    Applicant: HOECHST AG

    Inventor： GUTWEILER MATTHIAS DR ,  KROGGEL MATTHIAS DR

    IPC: C08F216/38 ,  C03C27/12 ,  C08F2/06 ,  C08F8/28 ,  C08F16/38

    Abstract: The preparation of soluble polyvinyl acetals which have a low degree of crosslinking and improved melt-viscosity behaviour by acetalisation of soluble polyvinyl alcohols with a low degree of crosslinking which have been prepared by hydrolysis or alcoholysis of soluble copolymers of vinyl esters and polyethylenically unsaturated monomers, such as, for example, glyoxal bisacrylamide, which copolymers have a low degree of crosslinking. In comparison with comparable uncrosslinked, soluble polyvinyl acetals, polyvinylacetals with a low degree of crosslinking according to the invention have greater structural viscosities and exhibit surprisingly advantageous properties during thermoplastic shaping, in particular during extrusion in plasticised form. The polyvinyl acetals with a low degree of crosslinking furthermore have improved mechanical properties compared with uncrosslinked polyvinyl acetals and are particularly advantageously suitable in plasticised film form for the production of laminated glasses.

    10.
    发明专利
    未知

    公开(公告)号：DE4033775A1

    公开(公告)日：1992-04-30

    申请号：DE4033775

    申请日：1990-10-24

    Applicant: HOECHST AG

    Inventor： GUTWEILER MATTHIAS DR ,  KROGGEL MATTHIAS DR

    IPC: C08F8/12 ,  C08F8/28 ,  C08F283/00 ,  C08F283/06 ,  C08G81/02 ,  C09K23/52

    Abstract: Polymeric acetals of polyvinyl alcohols grafted onto polyalkylene oxide graft bases or polyurethane graft bases which contain acetal groups derived from etherified omega -hydroxy(poly)-alkoxyalkanals of the formula (I), and a process for their preparation by acetalisation of appropriate graft polyvinyl alcohols, are described. The polymeric acetals according to the invention are internally plasticised and are polymers which are generally obtainable in solid form and can be converted thermoplastically without external plasticisers to films, mouldings or coatings. Mixed acetals with other aldehydes can also be prepared and enable properties to be varied widely, including the solubility in water or in organic solvents. The polymeric acetals according to the invention can be processed or used without solvents, for example from the melt, or as organic or aqueous solutions or as aqueous dispersions. The diverse solubility spectrum, the glass transition temperatures which are significantly lowered compared with polyvinylbutyral, the thermoplastic processability without external plasticisers, the external crosslinkability, the good adhesive capacity to diverse solid materials, the corrosion-neutral behaviour toward metals and the dispersion capacity in aqueous media enable the polymeric acetals according to the invention to be used in a broad industrial area, in particular, for example, as binders in organic or aqueous solutions or dispersions or in products to be used as liquid melts, preferably in paints, coating compositions, adhesives, dispersants, pigment binders, printing inks, green ceramic sheets, sizes, fibre binders, paper, photographic printing plates, photoresist materials, and as mouldings and transparent interlayer films for composite glasses.

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