WO2006002830A1 - Verfahren zur herstellung von polyvinylacetalen - Google Patents
Verfahren zur herstellung von polyvinylacetalen Download PDFInfo
- Publication number
- WO2006002830A1 WO2006002830A1 PCT/EP2005/006818 EP2005006818W WO2006002830A1 WO 2006002830 A1 WO2006002830 A1 WO 2006002830A1 EP 2005006818 W EP2005006818 W EP 2005006818W WO 2006002830 A1 WO2006002830 A1 WO 2006002830A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- vinyl
- mol
- group
- polyvinyl
- binder
- 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.)
- Ceased
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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
Definitions
- the invention relates to a process for the preparation of polyvinyl acetals by means of acetalization of partially hydrolyzed or fully saponified vinyl ester polymers, and to the use of the process products obtainable therewith.
- polyvinyl acetals from the corresponding polyvinyl alcohols by polymer-analogous reaction with the corresponding aldehydes has been known since 1924, with a large number of aldehydes having been used in the subsequent period for the preparation of the corresponding polyvinyl acetals.
- Polyvinyl acetals are prepared in a three-stage process (polyvinyl acetate-polyvinyl alcohol-polyvinyl acetal), resulting in products which, in addition to vinyl acetal groups, also contain vinyl alcohol and vinyl acetate units.
- Commercial significance has mainly been achieved by polyvinyl formal, polyvinyl acetoacetal and polyvinyl butyral.
- the corresponding partially hydrolyzed or fully hydrolyzed vinyl ester polymers are acetalated by reaction with the corresponding aldehyde.
- these starting materials are absorbed in aqueous medium.
- acidic catalysts such as hydrochloric acid, sulfuric acid or phosphoric acid
- the acetalization reaction is started by addition of the aldehyde.
- the acetalization is completed ren by heating the mixture to from 20 0 C to 60 0 C and several hours Rüh- after completion of the addition of the aldehyde, and the powdery, precipitated Reakti ⁇ ons 7, isolated by filtration.
- JP 05230129 A describes a process for the synthesis of a polyvinyl acetal having a high degree of acetalization, using solvent mixtures with dimethyl sulfoxide.
- the invention relates to a process for the preparation of polyvinyl acetals by means of acetalization of partially hydrolyzed or fully hydrolyzed vinyl ester polymers of one or more monomers from the group comprising vinyl esters of unbranched or branched alkylcarboxylic acids having 1 to 15 carbon atoms, with> 50 mol% Vinyl alcohol units, with one or more aldehydes from the group comprising aliphatic and aromatic aldehydes having 1 to 15 carbon atoms, characterized gekenn ⁇ characterized in that the partially hydrolyzed or fully hydrolyzed vinyl ester polymers are presented in solution or in slurry in the aldehyde.
- Suitable vinyl esters are vinyl esters of unbranched or branched carboxylic acids having 1 to 15 carbon atoms.
- Preferred vinyl esters are vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, vinyl laurate, vinyl pivalate and vinyl esters of ⁇ -branched monocarboxylic acids having 5 to 11 C atoms, for example VeoVa9 ⁇ or VeoValO- (trade name of Reso ⁇ lution). Preference is given to vinyl acetate.
- the vinyl ester polymers may also contain one or more monomers from the group comprising methacrylic acid esters and acrylic esters of alcohols having 1 to 15 carbon atoms, olefins, dienes, vinylaromatics and vinyl halides. Their proportion is then calculated so that the vinyl ester content in the copolymer is> 50 mol%.
- the vinyl ester polymers contain from 0.02 to 20% by weight, based on the total weight of the vinyl ester polymer, of one or more monomers from the group comprising ethylenically unsaturated monocarboxylic acids, ethylenically unsaturated carboxylic acid amides and carbonitriles.
- the vinyl ester polymers can be prepared in a known manner; preferably by bulk polymerization, suspension polymerization or by polymerization in organic solvents, more preferably in alcoholic solution.
- Suitable solvents and regulators are, for example, methanol, ethanol, propanol, isopropanol.
- the polymerization is leading and under reflux at a temperature of 50 0 C to 100 0 C by the addition of common effetge radical initiators initi- ated.
- common initiators are percarbonates such as cyclohexyl peroxydicarbonate or peresters such as t-butylperneo-decanoate or t-butyl perpivalate.
- the molecular weight can be adjusted in a known manner by addition of regulator, by the solvent content, by variation of the initiator concentration and by variation of the temperature. After completion of the polymerization, the solvent and, where appropriate, excess monomer and regulator are distilled off.
- the saponification of the vinyl ester polymers is carried out in a conventional manner, for example after the belt or Kneterverfah ⁇ Ren, in the alkaline or acid with the addition of acid or Ba ⁇ se.
- the vinyl ester solid resin in alcohol spielnem methanol , while adjusting a solid content of 15 to 70% by weight.
- the hydrolysis is preferably carried out in the basic, for example by adding NaOH, KOH or NaOCH 3 .
- the base is generally employed in an amount of from 1 to 5 mol% per mole of ester units.
- the hydrolysis is carried out at temperatures of 30 0 C to 70 0 C. After completion of the hydrolysis, the solvent is distilled off and the polyvinyl alcohol is obtained as a powder.
- the partially or completely hydrolyzed vinyl ester polymers obtained have a degree of hydrolysis of> 50 mol%. Preferred ranges are for the partially hydrolyzed polyvinyl alcohols Hydroly ⁇ segrade from 70 to 90 mol%. Fully saponified polyvinyl alcohols having a degree of hydrolysis of> 96 mol% are particularly preferred.
- the acetalization takes place in one or more aldehydes from the group comprising aliphatic and aromatic aldehydes having 1 to 15 carbon atoms.
- Preferred aldehydes from the group of aliphatic aldehydes having 1 to 15 carbon atoms are formaldehyde, acetaldehyde, propionaldehyde and most preferably butyraldehyde, or a mixture of butyraldehyde and acetaldehyde.
- aromatic aldehydes for example, benzaldehyde or its derivatives can be used.
- the partially or completely hydrolyzed polyvinyl acetates are dissolved or slurried in the corresponding aldehyde or aldehyde mixture.
- the partially or fully saponified polyvinyl acetates are used in an amount of from 5 to 30% by weight, based on the total weight of the solution or slurry.
- the acetalization takes place in the presence of acidic catalysts such as hydrochloric acid, sulfuric acid, nitric acid or phosphoric acid.
- the pH is adjusted to values ⁇ 1 by addition of 20% hydrochloric acid.
- the Acetali ⁇ tion is carried out at a temperature of 20 0 C to 60 0 C, preferably under reflux. If appropriate, after cooling the batch, the batch is neutralized by addition of base and the excess aldehyde is distilled off.
- the polyvinyl thus obtained are then dissolved in alcohol, preferably methanol or ethanol and falls widely ⁇ by lowering the temperature to ⁇ 5 0 C, preferably ⁇ 0 0 C and isolated by filtration.
- alcohol preferably methanol or ethanol
- polyvinylacetals are obtainable, which are characterized by a very low OH number (high degree of acetalization), low viscosity and very good solubility. in organic solvents.
- the OH number is 4 to 12, preferably 4 to 8 (titration method according to ASTM D 1396).
- polyvinyl lyvinylacetale find use as a film fibers inroughglä ⁇ and preservatives as an acoustic foil, as • binders in printing inks, as a binder in primers, as a binder in Korrosions ⁇ , as binders in the ceramics industry, specially as Binder for ceramic green bodies. Also worth mentioning is the use as a binder for ceramic powder and metal powder in injection molding (powder injection molding), as a binder for glass fiber, and as a binder for the inner coating of cans, optionally in combination with crosslinkers such as epoxy resins.
- the mixture was then cooled first to -I 0 C and then the temperature wei ⁇ ter lowered to -5 0 C. Meanwhile, 600 ml of a 10% KHCO 3 solution was added dropwise. The polyvinyl butyral fell fine and white.
- the OH number (titration method, according to ASTM D 1396) was 4, the viscosity of the 10% ethanol solution of the product (Höppler method) was 11.2 mPas.
- Example 2 Analogously to Example 1 with the difference that a polyvinyl alcohol having 98 mol% degree of hydrolysis and a Höppler viscosity (DIN 53015, 4% strength in water) of 2.9 was used.
- the OH number of the end product (titration method, according to ASTM D 1396) was 8, the viscosity of the 10% ethanol solution of the product (Höppler method) was 9.6 mPas.
- Example 2 Analogously to Example 1 with the difference that a polyvinyl alcohol having 98 mol% degree of hydrolysis and a Höppler viscosity (DIN 53015, 4% strength in water) of 4.1 was used.
- the OH number of the end product was 8
- the viscosity of the 10% ethanol solution of the product was 13.5 mPas.
- Example 2 The procedure was analogous to Example 1, with the difference that all components were mixed together at room temperature and initially heated to 50 0 C. The suspension turned into a viscous, clear solution which became thin liquid after 5 minutes. Thereafter, the reaction was carried out for one hour at reflux to completion and then worked up after cooling according to Example 1 and precipitated.
- the OH number of the end product was 6
- the viscosity of the 10% ethanol solution of the product was 12.0 mPas.
- Comparative Example 5 120 g of the polyvinyl alcohol from Example 1 were initially charged together with 500 ml of water and stirred with 125 ml of HCl (10% strength) and cooled to 0 ° C. Then, 100 ml of butylene raldehyd was metered over 45 minutes, after which the suspension further 40 minutes at 0 ° C held before it was then heated in 100 minutes 25 0 C. At this temperature was reacted for 90 minutes. Thereafter, it was filtered, washed with water and the product was dried.
- the OH number of the end product was 18, the viscosity of the 10% ethanol solution of the product (Hoppler method) was 25 mPas.
- the OH number of the end product was 18, the viscosity of the 10% ethanol solution of the product (Hoppler method) was 16 mPas.
- Example 1 Example 4 with Comparative Example 5
- Example 2 Comparative Example 6
- Comparative Example 7 shows that with the inventive method with the same polyvinyl alcohol starting material, a significantly higher acetalization degree of reduction (lower OH number) and lower viscosity of the final product than in the standard method of acetalization in aqueous solution / suspension.
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- 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
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/570,142 US20070244266A1 (en) | 2004-07-01 | 2005-06-23 | Method for the Production of Polyvinyl Acetals |
| JP2007518513A JP2008504414A (ja) | 2004-07-01 | 2005-06-23 | ポリビニルアセタールの製造方法 |
| EP05770755A EP1765880A1 (de) | 2004-07-01 | 2005-06-23 | Verfahren zur herstellung von polyvinylacetalen |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004031971A DE102004031971A1 (de) | 2004-07-01 | 2004-07-01 | Verfahren zur Herstellung von Polyvinylacetalen |
| DE102004031971.5 | 2004-07-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2006002830A1 true WO2006002830A1 (de) | 2006-01-12 |
Family
ID=34973183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2005/006818 Ceased WO2006002830A1 (de) | 2004-07-01 | 2005-06-23 | Verfahren zur herstellung von polyvinylacetalen |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20070244266A1 (de) |
| EP (1) | EP1765880A1 (de) |
| JP (1) | JP2008504414A (de) |
| CN (1) | CN1961009A (de) |
| DE (1) | DE102004031971A1 (de) |
| TW (1) | TW200613324A (de) |
| WO (1) | WO2006002830A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7498391B2 (en) | 2005-05-18 | 2009-03-03 | Kuraray Europe Gmbh | Process for preparing cationic polyvinyl acetals |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006012200A1 (de) * | 2006-03-16 | 2007-09-27 | Wacker Polymer Systems Gmbh & Co. Kg | Verwendung von Polyvinylacetalen als Low-Profile-Additiv |
| CN102131972B (zh) * | 2008-11-14 | 2013-05-22 | 兴研株式会社 | 微纤维的片状集合体、其制备方法以及其制备装置 |
| FR2939234A1 (fr) * | 2008-12-03 | 2010-06-04 | Nexans | Composition reticulable pour cable d'energie a moyenne et haute tension |
| CN103319635B (zh) * | 2013-06-26 | 2015-09-02 | 四川东材科技集团股份有限公司 | 一种聚乙烯醇缩醛树脂的制备方法 |
| EP3272792A1 (de) * | 2016-07-19 | 2018-01-24 | Kuraray Europe GmbH | Dünnschichten mit weichmacherfreiem polyvinyl-co-acetal |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10242417A1 (de) * | 2002-09-12 | 2004-03-25 | Wacker Polymer Systems Gmbh & Co. Kg | Verfahren zur Herstellung von Polyvinylacetalen |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5594069A (en) * | 1992-12-04 | 1997-01-14 | Monsanto Company | Process for producing mixed poly(vinyl acetal)s |
| DE102004054569A1 (de) * | 2004-11-11 | 2006-05-24 | Wacker Polymer Systems Gmbh & Co. Kg | Niedrig scherverdünnende Polyvinylacetale |
-
2004
- 2004-07-01 DE DE102004031971A patent/DE102004031971A1/de not_active Withdrawn
-
2005
- 2005-06-23 EP EP05770755A patent/EP1765880A1/de not_active Withdrawn
- 2005-06-23 JP JP2007518513A patent/JP2008504414A/ja not_active Withdrawn
- 2005-06-23 WO PCT/EP2005/006818 patent/WO2006002830A1/de not_active Ceased
- 2005-06-23 US US11/570,142 patent/US20070244266A1/en not_active Abandoned
- 2005-06-23 CN CNA2005800175645A patent/CN1961009A/zh active Pending
- 2005-06-28 TW TW094121731A patent/TW200613324A/zh unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10242417A1 (de) * | 2002-09-12 | 2004-03-25 | Wacker Polymer Systems Gmbh & Co. Kg | Verfahren zur Herstellung von Polyvinylacetalen |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7498391B2 (en) | 2005-05-18 | 2009-03-03 | Kuraray Europe Gmbh | Process for preparing cationic polyvinyl acetals |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2008504414A (ja) | 2008-02-14 |
| CN1961009A (zh) | 2007-05-09 |
| EP1765880A1 (de) | 2007-03-28 |
| TW200613324A (en) | 2006-05-01 |
| DE102004031971A1 (de) | 2006-01-19 |
| US20070244266A1 (en) | 2007-10-18 |
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