DE524509C - Process for preventing the coagulation of aqueous solutions of cellulose alkyl ethers - Google Patents
Process for preventing the coagulation of aqueous solutions of cellulose alkyl ethersInfo
- Publication number
- DE524509C DE524509C DEI32135D DEI0032135D DE524509C DE 524509 C DE524509 C DE 524509C DE I32135 D DEI32135 D DE I32135D DE I0032135 D DEI0032135 D DE I0032135D DE 524509 C DE524509 C DE 524509C
- Authority
- DE
- Germany
- Prior art keywords
- coagulation
- alkyl ethers
- preventing
- aqueous solutions
- cellulose alkyl
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/08—Cellulose derivatives
- C08J2301/26—Cellulose ethers
- C08J2301/28—Alkyl ethers
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Description
Verfahren zur Verhinderung der Koagulation von wäßrigen Lösungen von Cellulosealkyläthern Eine Reihe von Cellulosealkyläthern zeichnet sich durch die Eigenschaft aus, in kaltem Wasser löslich zu sein. Erhitzt man solche Lösungen auf höhere Temperatur, so tritt eine Koagulation, d. h. ein Ausscheiden der Cellulosealkyläther aus der wäßrigen Lösung, ein.Process for preventing the coagulation of aqueous solutions of Cellulose alkyl ethers A number of cellulose alkyl ethers is characterized by the Property of being soluble in cold water. If you heat up such solutions higher temperature, coagulation occurs, i. H. excretion of the cellulose alkyl ethers from the aqueous solution.
Bei vielen technischen Verfahren, die wäßrige Alkylcelluloselösungen verwenden, vor allem bei solchen, wo es darauf ankommt, das `Nasser schnell aus der Lösung zu entfernen, beispielsweise beim Gießen von Folien, ferner überall da, wo solche Lösungen auch bei höheren Temperaturen beständig bleiben sollen, macht sich das Koagulieren sehr störend bemerkbar.In many technical processes, the aqueous alkyl cellulose solutions use, especially for those where it is important to get the wet out quickly to remove the solution, for example when casting foils, also everywhere there, where such solutions should remain stable even at higher temperatures the coagulation is very disturbing.
Es wurde nun gefunden, daß man die Koagulation wäßriger Alkylcelluloselösungen bei höherer Temperatur dadurch vermeiden kann, daß man diesen Lösungen geringe Mengen teilweise oder völlig wassermischbarer organischer hydroxylhaltiger Lösungsmittel zusetzt. Z. B. fügt man einer toooigen Methylcelluloselösung in Wasser ungefähr too,o Alkohol zu. Gießt man eine solche Lösung auf eine Glasplatte, so kann man die Trocknung zu einem Film hei ungefähr 8o bis 9o- C vornehmen, ohne daß eine Koagulation eintritt, während ohne Zusatz von Alkohol der Celluloseäther bereits bei ungefähr 15 bis 4o" C aus der Lösung ausfällt. An Stelle von Alkohol können auch beispielsweise folgende organische hydroxylhaltige Verbindungen verwendet werden: Methylalkohol, Propylalkohol, Isopropylalkohol, Glykol, Glycerin, Methylglykoläther, Acetol usw. Die Mengenverhältnisse, in denen diese Verbindungen der Celluloseätherlösung zugesetzt werden, können in weiten "Grenzen schwanken, Mit Hilfe dieses Verfahrens kann die Trockenzeit der Cellulosealkyl.ätherfolie.n ganz wesentlich abgekürzt werden.It has now been found that the coagulation of aqueous alkyl cellulose solutions at a higher temperature can be avoided by adding small amounts of these solutions partially or completely water-miscible organic hydroxyl-containing solvents clogs. For example, one adds approximately to a thousand cellulose solution in water too, o alcohol too. If you pour such a solution onto a glass plate, you can dry to a film at about 8o to 9o C without coagulation occurs, while without the addition of alcohol the cellulose ether is already at about 15 to 4o "C precipitates out of the solution. Instead of alcohol, for example the following organic hydroxyl-containing compounds are used: methyl alcohol, Propyl alcohol, isopropyl alcohol, glycol, glycerin, methyl glycol ether, acetol, etc. The proportions in which these compounds are added to the cellulose ether solution can fluctuate within wide "limits. With the help of this procedure, the The drying time of the cellulose alkyl ether film can be significantly shortened.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEI32135D DE524509C (en) | 1927-09-07 | 1927-09-07 | Process for preventing the coagulation of aqueous solutions of cellulose alkyl ethers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEI32135D DE524509C (en) | 1927-09-07 | 1927-09-07 | Process for preventing the coagulation of aqueous solutions of cellulose alkyl ethers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE524509C true DE524509C (en) | 1931-05-08 |
Family
ID=7188064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEI32135D Expired DE524509C (en) | 1927-09-07 | 1927-09-07 | Process for preventing the coagulation of aqueous solutions of cellulose alkyl ethers |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE524509C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1029558B (en) * | 1952-04-01 | 1958-05-08 | Dow Chemical Co | Thermoplastic compositions made from water-soluble cellulose ethers |
-
1927
- 1927-09-07 DE DEI32135D patent/DE524509C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1029558B (en) * | 1952-04-01 | 1958-05-08 | Dow Chemical Co | Thermoplastic compositions made from water-soluble cellulose ethers |
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