WO2000073350A2 - Procede de production d'ethers d'amidon hydroxyalkyle en poudre a utiliser comme adjuvant de pulverisation - Google Patents
Procede de production d'ethers d'amidon hydroxyalkyle en poudre a utiliser comme adjuvant de pulverisation Download PDFInfo
- Publication number
- WO2000073350A2 WO2000073350A2 PCT/DE2000/001518 DE0001518W WO0073350A2 WO 2000073350 A2 WO2000073350 A2 WO 2000073350A2 DE 0001518 W DE0001518 W DE 0001518W WO 0073350 A2 WO0073350 A2 WO 0073350A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- starch
- preparation
- oxide
- reaction
- hydroxyalkyl
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B31/00—Preparation of derivatives of starch
- C08B31/08—Ethers
- C08B31/12—Ethers having alkyl or cycloalkyl radicals substituted by heteroatoms, e.g. hydroxyalkyl or carboxyalkyl starch
Definitions
- the products produced according to the invention are particularly suitable for applications as spray aids, also in combination with other customary spray aid additives, in the processing of aqueous polymer dispersions, prepared on the basis of various vinyl esters, their mixtures and combinations with other monomers, in particular with alkanes.
- the propoxylation can be carried out in a 40-45% aqueous alkaline suspension (for example US Pat. No. 1,876,920, US Pat. No. 2,516,634, US Pat. No. 3,033,853).
- sodium sulfate or sodium chloride US Pat. No. 2,516,634, US Pat. No. 3,378,546, US Pat. No. 3,422,088, US Pat. No. 3,577,407, EP 0 313 298
- DE 2 109 015 worked with a separate upstream catalytic activation of the starch in the presence of sodium chloride.
- the alkoxylations in aqueous systems are carried out at temperatures between 40-80 ° C. In any case, below the gelatinization temperature must be implemented if filterable products are to be obtained.
- the reaction times of such process variants depend on the desired one Degree of alkoxylation and can be up to 40 hours. For products with extraordinarily low degrees of substitution, they average 8-12 hours.
- Variants of this process use aqueous solutions of short-chain alcohols, such as, for example, methanol (JP 57 030 701) or ethanol (EP 0 109 776).
- the alcohols mentioned can also serve as solvents in undiluted form (US Pat. No. 2,845,417) or other alcohols, such as, for example, isopropanol (US Pat. No.
- protective colloid especially for the spray drying process of 'polymer dispersions, depends on the different development goals, e.g. B. the viscosity and flow behavior of a dispersion, the field of use of the dispersions or the polymer powder, influencing the spray drying process in the production of redispersible powder, the redispersion behavior of the polymer powder, u. a.
- the cyclone yield and the associated tower covering are important parameters when assessing a spray drying process.
- This object is achieved in that the starch is reacted in a mixture of an excess of C 3 / C 4 alkylene oxide and an optimal amount of ethylene oxide in the presence of an alkaline catalyst.
- the response times are usually more than 15 hours.
- the products obtained are moreover characterized by a surprisingly low oligoalkylene glycol content of less than 2% by weight, based on the starch used.
- hydroxyalkyl starch ethers produced according to the invention are outstandingly suitable as spraying aids in the working up of aqueous polymer dispersions. Their use is problem-free and leads to no caking phenomena during the process on the tower wall.
- hydroxyalkyl starch ethers produced according to the invention are suitable simultaneously in all known applications in construction chemistry and as a protective colloid in the known emulsion polymerization processes.
- reaction is terminated by vigorous cooling and / or neutralization using known organic or inorganic acids, the reaction product is separated off using conventional workup methods and the remaining, unreacted propylene oxide is recovered.
- analysis and characterization of the reaction product was carried out by means of gel permeation chromatography (GPC), H 1 -NMR spectroscopy as well as the Ninhydri ⁇ method to determine the degree of substitution of the modified starch.
- the unreacted alkylene oxide portion was analyzed using headspace gas chromatography.
- Example 2 (modified comparative example):
- 162 g of corn starch (moisture content 12.3%) are placed in a pressure autoclave apparatus corresponding to the prior art.
- the apparatus is flushed several times with nitrogen and subsequently charged with 600 g of propylene oxide, 3.24 g of NaOH in the form of a 50% strength aqueous solution, and a nitrogen pressure of 0.5 bar is set.
- the reaction mixture is then heated to a temperature of 70 ° C. with constant stirring and kept at this temperature for 6 hours. This creates a pressure of 3.0 to 4.0 bar.
- the reaction product was worked up and characterized analogously to Example 1.
- HEPS hydroxyethyl propyl starch
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
L'invention concerne un procédé de production d'éthers d'amidon hydroxyalkylé présentant un indice d'hydroxyle compris entre 350 et 600 et un degré de substitution molaire de 1 à 2. Lesdits éthers sont obtenus par alcoxylation d'hydrates de carbone alcalinisés avec un mélange d'oxydes de propylène-d'éthylène. Les produits obtenus selon ledit procédé conviennent particulièrement pour une utilisation en tant qu'adjuvant de pulvérisation. Le procédé décrit est mis en oeuvre en présence de catalyseurs, de préférence alcalins. La quantité totale d'un oxyde d'alkylène C3-C4, de préférence d'oxyde de propylène, requise pour la réaction avec l'amidon est mise à réagir avec 10 à 60 % en poids d'oxyde d'éthylène, par rapport à la quantité totale d'oxyde d'alkylène, à des températures pouvant aller de 40 °C à 80 °C.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999124773 DE19924773A1 (de) | 1999-05-29 | 1999-05-29 | Verfahren zur Herstellung pulverförmiger Hydroxyalkylstärkeether für den Einsatz als Sprühhilfsmittel |
DE19924773.0 | 1999-05-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2000073350A2 true WO2000073350A2 (fr) | 2000-12-07 |
WO2000073350A3 WO2000073350A3 (fr) | 2002-10-03 |
Family
ID=7909674
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/001518 WO2000073350A2 (fr) | 1999-05-29 | 2000-05-13 | Procede de production d'ethers d'amidon hydroxyalkyle en poudre a utiliser comme adjuvant de pulverisation |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE19924773A1 (fr) |
WO (1) | WO2000073350A2 (fr) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1019288B (de) * | 1953-05-19 | 1957-11-14 | Union Carbide Corp | Verfahren zur Herstellung von fester, granulierter, wasserloeslicher Oxyalkylstaerke |
US4585858A (en) * | 1967-01-03 | 1986-04-29 | Cpc International Inc. | Starch-based polyether polyols |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3903076A (en) * | 1974-06-26 | 1975-09-02 | Dow Chemical Co | Preparation and purification of cellulose ethers |
DE3919729C3 (de) * | 1989-06-16 | 1997-06-19 | Fresenius Ag | Hydroxyethylstärke als Plasmaexpander, Verfahren zu ihrer Herstellung und Verwendung als kolloidales Plasmaersatzmittel |
-
1999
- 1999-05-29 DE DE1999124773 patent/DE19924773A1/de not_active Withdrawn
-
2000
- 2000-05-13 WO PCT/DE2000/001518 patent/WO2000073350A2/fr active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1019288B (de) * | 1953-05-19 | 1957-11-14 | Union Carbide Corp | Verfahren zur Herstellung von fester, granulierter, wasserloeslicher Oxyalkylstaerke |
US4585858A (en) * | 1967-01-03 | 1986-04-29 | Cpc International Inc. | Starch-based polyether polyols |
Also Published As
Publication number | Publication date |
---|---|
WO2000073350A3 (fr) | 2002-10-03 |
DE19924773A1 (de) | 2000-11-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0077949B1 (fr) | Procédé pour la préparation d'hydroxypropylamidon | |
DE3004161C2 (fr) | ||
DE69724001T2 (de) | Superabsorbierendes material und verfahren zu dessen herstellung | |
EP1279680B1 (fr) | Procédé de préparation d'alkylhydroxyalkylcellulose | |
EP0080678B1 (fr) | Procédé pour la préparation d'éthers de la cellulose soluble dans l'eau avec le diméthoxyéthane comme agent dispersant | |
EP1883654B1 (fr) | Procede pour la modification chimique de polysaccharides | |
EP1132407B1 (fr) | Ethers de cellulose rendus hydrophobes, procédé de préparation et utilisations | |
EP1589035B1 (fr) | Procédé de préparation de méthylhydroxyalkylcellulose | |
EP2403882B1 (fr) | Procédé de préparation de dérivés de polysaccharide | |
DE2358150A1 (de) | Verfahren zum herstellen von wasser aufnehmenden, aber darin unloeslichen celluloseaethern | |
EP1180526A1 (fr) | Procédé de préparation de cellulose alkylée et hydroxyalkylée | |
EP0792889B1 (fr) | Application de dérivés d'inuline | |
EP2712873B1 (fr) | Ether de cellulose doté de groupes d'ancrage réactifs, éther de cellulose modifié obtenu de la sorte et son procédé de fabrication | |
EP1002804B1 (fr) | Dérivés sulfoalkylés de cellulose modifiés pour les rendre hydrophobes, solubles dans l'eau, procédé pour leur fabrication, et leur application comme colloides protecteurs dans la polymérisation | |
EP0117490B1 (fr) | Procédé pour la préparation d'éthers de la cellulose en présence d'un agent dispersant contenant aussi du diméthoxyéthane | |
EP0319865A2 (fr) | Carboxyméthylsulfoéthylcellulose et procédé de préparation | |
DD212969A1 (de) | Verfahren zur modifizierung von carboxymethylcellulose | |
WO2000073350A2 (fr) | Procede de production d'ethers d'amidon hydroxyalkyle en poudre a utiliser comme adjuvant de pulverisation | |
DE2329215A1 (de) | Chloropren-elastomermasse | |
EP1049719B1 (fr) | Ethers cellulosiques contenant des groupes butenyle et leur utilisation comme colloides protecteurs lors de polymerisations | |
DE69023862T2 (de) | Verfahren zur Herstellung wasserlöslicher silylierter Polyvinylalkohol. | |
EP0076988B1 (fr) | Procédé pour la préparation d'éthers de cellulose | |
DE2410560C2 (de) | Dicarboxymethyläther von Poly- und Oligosacchariden, Verfahren zu deren Herstellung sowie deren Verwendung als waschkraftverstärkende Zusatzmittel für Waschmittel | |
DE4238627A1 (de) | Methylhydroxypropylcelluloseether als Verdickungsmittel für Abbeizer | |
EP2185602B1 (fr) | Procédé de production d'acétals de polyvinyle à faible teneur en aldéhyde résiduel dans des eaux usées |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): JP US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
AK | Designated states |
Kind code of ref document: A3 Designated state(s): JP US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A3 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
122 | Ep: pct application non-entry in european phase | ||
NENP | Non-entry into the national phase |
Ref country code: JP |