DE744401C - Process for the production of polyvinyl chloride with a low degree of polymerization - Google Patents
Process for the production of polyvinyl chloride with a low degree of polymerizationInfo
- Publication number
- DE744401C DE744401C DEI60235D DEI0060235D DE744401C DE 744401 C DE744401 C DE 744401C DE I60235 D DEI60235 D DE I60235D DE I0060235 D DEI0060235 D DE I0060235D DE 744401 C DE744401 C DE 744401C
- Authority
- DE
- Germany
- Prior art keywords
- polymerization
- polyvinyl chloride
- production
- low degree
- gasoline
- 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
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F114/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
- C08F114/02—Monomers containing chlorine
- C08F114/04—Monomers containing two carbon atoms
- C08F114/06—Vinyl chloride
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polymerisation Methods In General (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
Verfahren zur Herstellung von Polyvinylchlorid niedrigen Polymerisationsgrades Die Polymerisatiort von Vinylchlorid in wäßriger Ernulsion ist bekannt. Man arbeitet dabei in der Regel bei Temperaturen von etwa 5o° und erhält dann einen Kunststoff, dessen Polymerisationsgrad nach F i k e n t -s c h e r (Zeitschrift für Cellulose-Chemie, Bd. i3, t932, S.6o) etwa 6oK ist (K=k.io3). Wenn auch Kunststoffe dieses Polymerisationsgrades für die meisten Verarbeitungszwecke gut geeignet sind, so besteht doch für bestimmte Sondergebiete, beispielsweise Herstellung von Spritz- oder Hachglanzpoliturlacken, das Bedürfnis, auch Polyvinylchlorid mit wesentlich niederem K-Wert herzustellen, aus .dem sich also niedrigviscose Lösungen herstellen lassen.Process for the production of polyvinyl chloride with a low degree of polymerization The polymerization of vinyl chloride in aqueous emulsion is known. One works usually at temperatures of about 5o ° and then receives a plastic, its degree of polymerization according to F i k e n t -s c h e r (magazine for cellulose chemistry, Vol. I3, t932, p.6o) is about 6oK (K = k.io3). Even if plastics with this degree of polymerization are well suited for most processing purposes, there is for certain Special areas, for example the production of spray or high-gloss polish paints, the need to also produce polyvinyl chloride with a significantly lower K value, from .dem therefore low-viscosity solutions can be produced.
Es ist zwar schon ein Polyvinylchlorid mixt verhältnismäßig guter Löslichkeit in z: B. Toluol bekanntgeworden. Dieses wurde durch Polymerisation in einem organischen Lösungsmittel bei erhöhter Temperatur erhalten, wobei außer der umständlichen Arbeitsweise auch eine Verfärbung des Endstoffes in Kauf genommen werden mußte.Although it is already a polyvinyl chloride mixes relatively good Solubility in e.g. toluene became known. This was made by polymerization in obtained an organic solvent at elevated temperature, with the addition of cumbersome way of working, a discoloration of the end product is accepted had to become.
Fernerhin wurde vorgeschlagen, Vinylchlorid in einer wäßrigen Emulsion unter Zusatz eines E,mulgiermittels zu polymerisieren, um ein möglichst hochpolymeres Endprodukt zu erhalten. Dabei kann auch eine Reihe von organischen Verbindungen, u. a. Kohlenwasserstoffe oder deren Chlorierungsprodukte, zuesetzt werden, um die Emulsionsbildung ZU' beeinflussen.It has also been proposed to polymerize vinyl chloride in an aqueous emulsion with the addition of an emulsifying agent in order to obtain an end product that is as highly polymeric as possible. In this case, also a number of organic compounds are, inter alia, hydrocarbons or their chlorination products, zuesetzt, influence the emulsion formation TO '.
Wie nun gefunden wurde, lassen sich Polyvinylchloride mit einem K-Wert in Höhe von etwa 28 nach dem Emulsionspolymerisationsverfahren herstellen, wenn man Vinylchlorid in Gegenwart geringer Mengeneines nicht polymerisierbareii alipliatischen, niedrig . molekularen Chlorkohlenwasserstoffes und von Benzin "in wäßriger Emulsion polymerisiert. Dabei hat die Mitverwendun.g von Benzinen den Vorteil, daß eine unerwünscht hohe Drucksteigerung vermieden wird, daß man also die stark exotherm verlaufende Poly; .; merisation immer gut überwachen kann. .: Als Emulsionsmittel sowie als Katall.@#i . tonen lassen sich dabei die für diese @wel':,;? bekanntgewordenen (vgl. z. B. amerikanische"" Patentschrift 2 o68.12.1) verwenden. Um eine Zersetzung des Vinylchlorids zu vermeiden, gibt man dem Emulgierungsgemisch noch einen Stabilisator, z. F. sec. N atriumphosphat, zu. Beispiel In Zoo 1 einer wäßrigen Lösung, enthaltend o,5 0,'o a-oiyoctodekansulfosaures Natrium, o,5 0'o sec. Natriumphosphat und i % Wasserstoffsuperoxyd, bezogen auf Wasser, werden 5o kg Vinylchlo.rid zusammen mit 5l,.,- eines Gemisches emulgiert, welches Tetrachlorkohlenstofi und Benzin vom Siedepunkt 55 bis 65' im Verhältnis 3:1 enthält. Diese Emulsion wird in einem Druckgefäß auf ; o bis 75' erhitzt, um die Reaktion in Gang zu bringen (Dauer der Reaktion q. bis 5 Stunden), wobei ein Druck bis zu 15 Atin. auftritt. Dann wird aus dem Reaktionsgemisch tniverändertes Vinylchlörid sowie der zugesetzte Chlorkohlenwasserstoff- und das Benzin durch Verdampfen entfernt. Man erhält in einer Ausbeute von 8o bis 850!o ein festes Polyvinylchlorid in feinstverteiltem Zustand, dessen Polymerisationsgrad einem K-Wert von etwa 3o entspricht.As has now been found, polyvinyl chlorides with a K value of about 28 can be prepared by the emulsion polymerization process if vinyl chloride is used in the presence of small amounts of a non-polymerizable aliphatic, low. Molecular chlorinated hydrocarbons and gasoline "polymerized in aqueous emulsion. The use of gasoline has the advantage that an undesirably high increase in pressure is avoided, so that the highly exothermic polymerization can always be monitored well..: As Emulsifiers and as Katall. @ # I. Clays can be used for this @wel ':,;? a stabilizer, for example sodium phosphate, is added to the emulsification mixture i% hydrogen peroxide, based on water, are 5o kg together with 5l, Vinylchlo.rid - emulsifying a mixture comprising Tetrachlorkohlenstofi and petrol having a boiling point 55 to 65 'in the ratio 3: 1 contains This emulsion is on in a pressure vessel;.. o Heated to 75 'in order to get the reaction going (duration of the reaction q. up to 5 hours), with a pressure of up to 15 atin. occurs. The modified vinyl chloride and the added chlorinated hydrocarbon and gasoline are then removed from the reaction mixture by evaporation. A solid polyvinyl chloride in extremely finely divided state, the degree of polymerization of which corresponds to a K value of about 3 °, is obtained in a yield of 80 to 850%.
Selbstverständlich kann man auch die Polynierisation im Strömungsrohr kontinuierlich durchführen.Of course, you can also carry out the polymerization in the flow tube perform continuously.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEI60235D DE744401C (en) | 1938-01-15 | 1938-01-15 | Process for the production of polyvinyl chloride with a low degree of polymerization |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEI60235D DE744401C (en) | 1938-01-15 | 1938-01-15 | Process for the production of polyvinyl chloride with a low degree of polymerization |
Publications (1)
Publication Number | Publication Date |
---|---|
DE744401C true DE744401C (en) | 1944-01-14 |
Family
ID=7195192
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEI60235D Expired DE744401C (en) | 1938-01-15 | 1938-01-15 | Process for the production of polyvinyl chloride with a low degree of polymerization |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE744401C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1115925B (en) * | 1957-07-31 | 1961-10-26 | Basf Ag | Process for the production of vinyl chloride polymers and copolymers in aqueous suspension |
US3026306A (en) * | 1956-11-06 | 1962-03-20 | Lonza Electric & Chem Works | Preparation of aqueous dispersions of polymers |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB349499A (en) * | 1930-02-24 | 1931-05-26 | Ig Farbenindustrie Ag | Process for the manufacture of artificial rubber or rubber-like masses |
FR773220A (en) * | 1933-05-12 | 1934-11-14 | Ig Farbenindustrie Ag | Process for the preparation of polyvinyl esters |
FR801034A (en) * | 1935-01-19 | 1936-07-25 | Chemische Forschungs Gmbh | Polymerization products and their manufacturing process |
-
1938
- 1938-01-15 DE DEI60235D patent/DE744401C/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB349499A (en) * | 1930-02-24 | 1931-05-26 | Ig Farbenindustrie Ag | Process for the manufacture of artificial rubber or rubber-like masses |
FR773220A (en) * | 1933-05-12 | 1934-11-14 | Ig Farbenindustrie Ag | Process for the preparation of polyvinyl esters |
FR801034A (en) * | 1935-01-19 | 1936-07-25 | Chemische Forschungs Gmbh | Polymerization products and their manufacturing process |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3026306A (en) * | 1956-11-06 | 1962-03-20 | Lonza Electric & Chem Works | Preparation of aqueous dispersions of polymers |
DE1115925B (en) * | 1957-07-31 | 1961-10-26 | Basf Ag | Process for the production of vinyl chloride polymers and copolymers in aqueous suspension |
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