DE1418880A1 - Process for the production of alkali cellulose and its ethers - Google Patents

Description

HEROULSS POWDER COMPAHY, 900 Harket Street, Wilmington / USA.

Process for the production of alkali cellulose and its ethers

The invention relates to a method for making and from improved alkali cellulose won · water-soluble alkali-soluble oil-cellulose ethers, whose solutions are unusually smooth and which have practically no thixotropic properties

Various alkali-soluble and water-soluble cellulose ethers have a number of economic applications due to their ability to thicken aqueous solutions, found. So far, such aqueous colloidal ones Solutions in general by a pronounced xhixotrople which are intended for some areas of application, such as thickening, suspending and stabilizing What is important and important is that such aqueous colloidal solutions are also characterized by the presence of croissants or XUimponen been featured for some Applications as a thickener, suction medium and stabilizers nüit the application of such Have prevented cellulose ether.

On the other hand, there are different applications g area ·, eiaeohließlioh des Sehliohteiie * fil * forming • o Löeun <en and the like ·, with dtnen the bieher can * lnend · ^ ο Amf irett «. von Xöraohea and dai thixotr ^ pe VftxiuüLtea the § ^ alkftlilöelieheik and wmieerlEsliohMi Oellsileseä- * hiir »Ioa g g fat & part * «rsjLtv« a Lab · * catf il · A ^ wea- ο

b * l 7, bsi bit

or very little thixotropic are needed.

The production of cellulose ethers in a sludge system is known. Thus, for example, water-soluble salts of Carboxyalkyloellulose, particularly Natriumearboxymethyloellulose easily prepared by 'that the cellulose with alkali is treated the same to swell and easier to reräthem _f where then the resulting cellulose is etherified with a carboxyalkylating "while the cellulose in an aqueous alkaline organic medium, such as a mixture of water, sodium hydroxide and an aliphatic alcohol with 2 - 5 carbon atoms. In addition to these alcohols, other inert organic water-miscible and also water-immiscible diluents have been used. After the etherification reaction, the crude cellulose ether product can be neutralized and dried directly, or the same can be neutralized and then washed free of the salts formed as a by-product with a suitable aqueous alcohol clay, and dried.

Cellulose ethers have been produced industrially for a number of years by a slurry process of the type described above, and many improvements have been made to this process over time. Up to now, however, it has not been possible to produce cellulose ethers which give smooth "clear and uniform solutions when dissolved in water" as is the case with the Pail cellulose ethers prepared according to the invention. This · unusual characteristic features are btaeiohnet herein ale smoothness, and found "that it" features do rewarding for cellulose ethers are "having a remarkably low content of Eörnohen slightly · Thixotrop! · And ö" lf "etigkeit .

According to the finding, it was suddenly found that

sioh l # ioht ia fas «« r unt «r Uawgwi Its ·· *. Inebeeon-

«Ion di« s · O «Httle« »lth * r in Waeeear e» t «r Xr-

BAD LOCAL

■ · 3 -

aiming for a solution that has a shixotropy of less than about 1 χ 10 erg / ml / sec, a grain size of not more than about 2 and a gel strength of less than about 200 dyn / om having, this gel strength, thixotropy and Grain size can be measured in a 2% by weight solution if the viscosity of this cellulose ether in a 2 wt Solution does not exceed about 1000 cP. This measurement is carried out in a 1 öew * # igen solution, if the viscosity of this Gelulose ethers above about 1000 cP in a 2 weight "$" dough Solution is.

Another surprising and very important one Invention according to the feature is that it is resistant the very smooth solutions in the defined way in to a much greater extent than is possible by any previously known procedure

It has been found that an improved alkali cellulose and from it, by etherification, cellulose ether products with the above-mentioned useful properties can be produced, this process being characterized in that the cellulose material is mixed with an aqueous alkaline solution in the presence of an inert organic diluent 1-3 hours at a ^ temperature of 0 - is brought j5O ^e C into contact, and the weight ratio of the diluent to the cellulose material is about 6 - 19 parts diluent to 1 part is cellulosic material "and the diluent by volume aufweistt the following ingredients

a) 70-96 $ of a water-miscible inert organic material,

b) 0 - 16 $ of a »wide miscible with water inert organic material,

⁰⁰ c) $ 4 - $ 15 water,

where the resulting alkali cellulose is then etherified

co -

ο will «if the production of the cellulose ether product

^ wishes is.

ο It has been found that tine numbers are related to each other

ca Interaction of standing variables within certain

** Limits must be controlled in order to ensure that they are in accordance with the invention

smooth products sa obtained. _ßAD

According to the invention, the diluent can be at least one water-soluble diluent * such as aliphatic alcohols with 2-5 carbon atoms, bioxane » Tetrahydrofuran and acetone provided that aage · « be applied "that under certain conditions at least" two water-miscible thinners in the thinner · - » a mixture must be present in order to obtain the smooth gelulose ether products according to the invention. Thus contains that during the manufacture of the alkali cellulose and during the etherification present dilution liquid ismer and alkali together with at least one of these water-miscible diluents. Under certain conditions If the dilution mixture is at least two water-visible Contain diluents · If more than 1 water-soluble diluent is required, the same can be used can be selected from the above-mentioned diluents and methanol

Me effect of methanol e.g. as the «wide water *» Miscible diluents in the diluent quite surprising and does not correspond to the »what one can expect according to the state of the art. Although the mode of action of this "broad water-soluble diluent is not exactly established" it has been found "that the same is necessary within certain inventive conditions. In the ti.S, patent specification 2,517,577'-tat the use of isopropyl alcohol or tert-butyl alcohol as a diluent in a slurry system star production of Garbozyalkyloellulose ^ ether disclosed Although this patent specification does not contain anything of the smooth oil-oil ether products obtainable according to the invention. hilt, it is stated there »that very bad · ärgebfilsse both with regard to the efficiency of the etherification as » also the greatest possible degree of substitution as with methanol as a diluent i & comparison for the application of Isopropyl alcohol of any urt.-duty! Alcohol among the same Conditions to be obtained "

Uis mentioned above in mutual harmony atehandsa. Changeable »the Within beetlamter Grensen must be controlled »so that the smooth

803806/0987 ^BA ° ⁰ ^ - * -

according to the invention Oellttloseäther products. obtain" close dl · temperature of alkali cellulose, the length of time the division of the alkali cellulose as well as the Composition of the YerdÜ & aungsmlttels a «

The following examples illustrate specific examples of the invention Execution »form · The aqueous solutions All of the products presented in these examples were, by virtue of their smoothness properties, "like them above indicated are »marked and fall eotait jn den Hahiaen of the present invention. The degree of substitution of all the cellulose ethers given in these examples fall within the range of 0.4 - l "0" All given Proportions and proportions are given in parts by weight "unless otherwise noted"

Examples 1 - 24 (Table I)

In Examples 1-24, the specified amounts (Table X below) of water of methanol (99 + $ anhydrous) and of isopropyl alcohol or tert -batyl alcohol (99 + 5% of water) are placed in a solution vessel «72» 5 #igei geeohsoleenea Jfatriumhydroxyd (0.58 ropes lOO ^ lges laOll / l rope of cellulose) with the one-step addition of alkali hydroxide under the resulting Yerdüajysag · - · Eittel enter stirring at Begiss. & φτ Manufacture of the alkali cellless "ugesetst" and with the two-stage Alkalifeydrojcydfittfebe, the further addition takes place when the production of the alkali cellulose is completed before the addition of the monochlorous acid Qi & ore (XCS) "You tester at ur & m the resultant contradiction is on til * X shown ^{v- r} e4t * during the production of the alfcalioallalose. The? l «jTttroek * ae Ctlluloae in. Fora ron pulp in the examples 18-20 cad BsBLBwoll-Liater in the other examples (about $ - 10 wt.

one # trc ^ en imd da »5f- * sti» oh währ * nii ύ * τ d * y Aifcall * f * UBlo »t stirred» ecdajta wtri eist *

(θ »65 ϊ 11 MÖS / i feil CJ ^ llmloat)

gas lM'etsi «M | iifefjif«! {^ »filkrttaia« Si «

M ± * »t * m 1« * ι »uf» la «2®Si5 * ratur roa 70 * 0 heats up sorry

8AD ORlGINM. - »* -

Held at a temperature of 70 ° Ö for 90 minutes. The temperature is reduced and concentrated acetic acid is used to neutralize the excess sodium hydroxide. The diluent used in the reaction is siphoned off and the by-products including sodium glycolate and sodium chloride are removed by washing the Gärboxyiaethyloellulose-Produkt (OMG) with 80% aqueous methanol. The pg value is then adjusted to about 7-5 in aqueous methanol * The ÖMO is centrifuged, dried in a vacuum oven and pulverized through a dog-hole slab with a mass size of 3.18 mm. Liquid aqueous solutions are produced by the CKO and the properties of these solutions are determined. The diluent consists of an inert organic liquid (namely isopropyl alcohol or tert-butyl alcohol and, if necessary, methanol) and water excluding the sodium hydroxide and the water added to the cellulose. The amount of water added with the hatriam hydroxide is a constant value τοη 27.5 parts of water per 72 »5 ropes of 100% sodium hydroxide» and the amount of water added with the cellulose is a constant value of about 5-10 Wt% of the cellulose used. Thus the ratios tfaOH / Celluloae, MCS / Celluloe ·,

kept constant, and the production times of the alkali cellulose are separated » the temperature of the alkali cellulose and the water content of the thinning agent Ttränäert. Furthermore, those in. The amount of ethanol used is determined

BATH ORIGINAL

Table I (Examples 1 - 24)

Example A / C Time A / C temperature-Yerdünnangs-Hr · ή temperature ⁰ C medium / Celltt-

loose 1.NaOH / ₃ 2 · SaOH / ₄
Cellulose cellulose

YoI * j & an YerdünnuÄgs—

middle* ';'■ Ci

H ₁ O '■ Alkfu jhy # roxyd-Be

'■' · .. rich

3 4

6 7 8

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24-

η η

it

η β η υ υ

«I ft

H "

2 η

η it η

15th

It

30th

O »

It

«15

It

30th

η η

ι »

15th

η η

H It

It

It

10.3

0.58

η η

dd

η η η

κ η

5.6

5.6

18.6

10.3

η ι?

With

0.40

0.30 0.58

no β Il 9 η 12th It 7.5 dd 7.5 ^w 9 N 12th η 15th «■ 6th 9 η 12th η 7.5 8.5 * ι 10 It 7.5 It 9 dd 12th » 8.8 It 10.3 ή 8.8 0.18 8.8 It 8.8 0.28 7.5 no 7.5

3.1
0-8.5 7.0-9.5 O - 3.0 3.0-5.0 3.0-9.5 6.0-12.5 15.0

0-3.5 0-12.0

5.5-16.0

Icein

6 ^ 5

2.5-7.5

0-7.5

2.5 * 7.5

2.5

9.4

2.5

no

5.0

5.0

10.0

1. Α / Ο 1st alkali cellulose,

2. The constituent of the detergent is isopropyl alcohol in Examples 1-22 and tertiary alcohol in Examples 23 and 24..

3. Targets as 72.5 ^ SaOH at the beginning of the A / C production

4. Added as 72.5 ^ HaOH at the end of A / C preparation before adding MCS.

Examples 25-55 (table II)

Examples 25-35 are the same. Knows as in Examples 1-17 and 21-24, with isopropyl alcohol in combination as a diluent bit a second, marine-grade inert organic material (Examples 25-32) is used in addition to methanol, and also as the only diluent further mixed with water « Barely inert organic materials other than isopropyl alcohol and tert-butyl alcohol (Examples 33-35) can be used. In all of these examples, the Here division is · since for the alkali cellulose 2 hours and the temperature of the exposure is 15 ° C. In all of these Examples are a single-stage addition of the alkali metal hydroxide applied.

BATH

1 !

O O

α Pi

m m

• 9-

ιλ to ο ο tn oo

X N ^ i Q <N ΙΑΟΦ-

vr>

COCQQ3Qf "iCOG9CG (T» <Tt

·. C # »·.«: «Ft * CTl W. rl (Λ 00 ^

a *

cc c

* 4 · · ■

QOH

Ö '0 · * dc? » · Rf rT rf

r4 H rf H rf rt rf

VO {* »CO Ch Q rt CM rv« ä * SA

BATH ORIGINAL

ηa «aan / nan?

Seed the in an inert organic diluent If suspended cellulose has been brought into contact with an aqueous alkali solution, it is important the conditions of the present invention for the alkali cellulose reaction mixture so as to maintain the subsequent To prevent formation of clay oilulose ether products » which form granular solutions. " the characteristics of which are thlxotropic behavior and inexpediently high gel strength are · As the alkali cellulose reaction mixtures according to the invention are usually liquid mixtures the usual. Mixed arrangements, such as flight hosts »ÜJurbomischem and the like easily stir or mix in a suitable vessel

Alkali cellulose produced according to the invention !! be aur producing all kinds of alkali-soluble and water-soluble cellulose & thern applied "and it koamt here only one U" eetgun§ the aufgeaohlämmten alkali cellulose old the desired Ver & therungsmittel under corresponding, and known Wasetiuagebtdingungea aar application, u * so the desired cellulose ethers get su · lift such! .ethers belong to ι, Β. Yeree & Ledene alkalilös lent · and water-soluble Hydroxyalkyleellttlosen as HydroxyäthyX * Hjdroagrpropyloellalos "and the like, _f Oarfeoxyalkylwie Oar ^ oxyiaethyloellulose, Garboxyätiiylotllulo ··, etc. ·" Saifaal3qrle *! Lulo "tn as SulfoäLthyloelluloie" Alkyloelloloe @ n _f as Methyloelluloe · and Aethyloelluloa " Oyanoäthylceliuloae, yersohisdene gemisohte ether _t as Carbosyaethylliydroxyüthyloalluloe "Oarboxyaethylmethyloelluloesj lidthylhydroxyäthyloellolose and the like. Teraohiedene aweokmäßige method sur preparation are given each of the above alkalilösliehen and water-soluble cellulose ethers and other corresponding compounds in the literature" for example the improved erfiaduagsgsmäßen Alkalloelluloeen for Her-Btellii . ^ ^ Tei'büsserter ÖHrbo alkylaelluloBeäther naah of Ve rfaiir ens as is IU0. Patenteoiirlf t 2517577 »offered Ber- Terbeesortor Hydrozyalkylcellaloaeäther naoh nt II» 8. Pat "very iit 2,572,039 t

■■ ■ ■ - ■

^v BAD ORIGINAL

- li -

position of improved sulfoethyl cellulose ethers and improved OarboxyalkylhydroxyalkyleelluloBeäther according to the procedures of TJ.S * patents 2 58Ö 352 and 2,618,632 will be applied. The inventive method is particularly effective in producing improved water-soluble and alkali-soluble carboxyalkyl celluloses, including Carboxymethyl hydroxyethyl cellulose * Carboxymethyl cellulose, carboxyethyl cellulose and improved water-soluble and alkali-soluble hydroxyethyl celluloses and sulfoethyloelluloses. '

The method of the invention is good for manufacture of carboxymethyl cellulose with a degree of substitution of 0.4 and more substituent groups per hydrogluose unit suitable in the cellulose molecule, with a degree of substitution of 3 being the theoretical maximum As, however, obvious to the person skilled in the art ^ the necessity of the process according to the invention decreases as the degree of substitution of the cellulose ethers approaches down to the value 3, since the probability of the achievement of ethem «their aqueous solutions by inexpediently high Thixotropic! ·, Grain size and gel strength are marked, decreases ·

The cellulose used according to the invention Any suitable and known starting material can be made from uasetaungigeia cellulosic material, such as cotton oilulose, cleaned cotton linfers or pulp or other appropriate materials. Although it is for that It is not necessary to carry out the method according to the invention 1st, is it appropriate to use cellulose? the on • a sufficiently small (particle size has been crushed 1st «am so through the openings of a sieve or JTetx *» old to a height of 0.50 ma step through. Cellulose comminuted serially has the advantage that it lends itself and is uniform to an inert organic

saspendieri »can» whereby the

fibrous cellulose lhen none! Telgong «own elon la the suspension or slurry in agglomtratt zaäaeaen «· ttsole or filmed "Furthermore, it is to be fated,

808806 / Oief

that the smaller the one a C "lluloeet" ilehen _f is can be suspended "the sufriedenstellend in the erfladungsgemißen AufsohlänaungsasdittA so the Uewichteprosentsatz of the cellulose, and" had to below a machining * - grense γοη about 20 wt · ^ cellulose · You comminution can can be effected by any suitable small "riragerorti®htung _A" such as knife mills, hammer mills, ball mills, Hollander, Jordan devices, attrition mills and the like. If necessary, however, common cotton linters or zersohnitselt rayon or even raw cotton can be used instead of chopped cellulose may be or aufgesohläastt _t ^ cellulose about 3 _f 5 wt..

Although propyl alcohol and tert-butyl alcohol are quite suitable for the purposes according to the invention, organic material which is inert to the water-resistant organic material can be found according to the invention, B. "Ne of the following" connections are Wandt anger * Acetone »dioxane, tetrahydrofuran _t aliphatisohe alcohols sit 2-5 Kohlenstoffatonen einsohliefllieh ethyl alcohol) n-propyl! Alcohol, i-propyl, n-Btttylalkohol, sec-Sutylalkohol, i-butyl alcohol, tert .-Butyl alcohol, n-Any! Alcohol, eek.-Aayl alcohol »ttrt.-Aayl alcohol. Furthermore, »as further stated, if more than • in water ice-owable Terdünawngaaittel are required,» all thinning sides can be selected from the just specified «ma methsntl«

Although latriafthjdroxyä claims that «I.

• an inconvenience and costs istι are for <i «inventions Iweek ·« 11 «alkali

edsr

• to wertem irft "tli" Ä § fr »$ £ tm ·" · "!

1 Of £ β "ng" w "? E * i 9t um 9iMm Istfts ¹ " iatff. »Elfejdl« Tt «i Pieart * naÄ« r «ksAfttlt»

BAD ORIGINAL W

the duroh. dif Aateriean Oyanaald Ooapany * BridgeriXXe, PennayXYania in the hand «X gtbraoat is) in« in · tea

. spoons · · !! «· of a daughter's prepared 15% or 2% solution d« 9 Otllulosc & ther * (depending on the quality of the ViakoitJltseigenaenaft the OelXuloseKthers) mixed in. Ss will be 8 drops "in"? X, fig solution of a blue. YahruftgsmitteXfarss (McOoraiok and Öonpangt, Baltimore, Maryland) “is then thoroughly re-examined. A sufficient amount of this solution is transferred to the center of a "aa ^" rt <n troo3E "a * n XS ₁ 7 χ 20" 4 cm glass plate, so that in a little bit sia "a DuroJimeeiier toe. about Ij9 ο »* a · Γ £ β ¥ β &» Mf the · * LiJsUBf becomes another

tHatplatte on «spr« {St »where the Löeuag iwisoänen. dea plates «39ifl» ritttt is «Me Platima wtrdea« dXange mamtmmmgßVTQptt htm miQh. di «Löaa ^ $ twa 1.25 e% tob. den XÄngesren Said eatiarat is "TO" Plattsm "earth under" Iä ** fe ^ insea ϋηι?! "· on the oHex> @ fXatt® Toa * inand« r jttresat. Me imte? E flatte is laid sun TreeJDbiai MLetif «. ! «Am iie? Xatte Ίϊ« βΙ »η ist» is al «ieit fies · airteif a S« tt # säsä «% tn e ^ f« im «s ^ s% @ ^ wsif e Ö # erf laafee« attr i ^ tar B «l« tttat «^ i» * x% «& t üad ait ke ^ iistellt © ^ Sta & darlTeüien f» FsUenen ₉ deaen! ■■■ iim T « I - f siget« £ l% w «srtan sini« ^ is the | ^

fSlitit li ^ Bi M i ^ wme *

rifok «tugliaJi £ * y ittBl ^ ägFe ^« a «| g« f »ial ^ Atf ^ it Aer • Sie cna «liswä ^ $ Ir * 1ie n» itt © t ^ iijti tHds> ei »jiti @ sf · Wesn iä«

as

BATH ORIGINAL

Thus, those who have not been bettered according to the invention Cellulose ether "the" Ine grain size not very much as 2 feeeitzen, not very ale 6 & elfleolcen / oB, if the Measurement according to the specified method t rf ο Igt,

Both the oil moisture as well as the thixotropic! · are made from a graphic representation or graphical construction on coordinate paper »with centimeter division receive «with the Soherspeed in eaT * as ordinate against the Seherfeelastuag in dyn / em as the Absslsse is applied · The Üheograwi is »it de« Houoseher-Tiskoaeter and Ternittels the in the TerSffentliohimg "Her» oules High * Shear Tisooneter "Ton J.W. Saith and P.D. Agiegat ·, Paper Trade Journal »Volume 126» Ir * 23 »Pages 60-66 (1948) Sappi Seetion, pages 266 * 271 Isesehriehenen The procedure obtained · The following items relating to the preparation of OsllaloseätherlOsHBg and the Production of the 3heograa @ es Rttssen 1 »eaohtet to be ·

lin before Gewi »ge & @ r iattil trooleenen eelluloseder sasrsisht,« b tatweder #! * ♦ 19Uo4 »r 2 ^ ig · ft i ^ Magigkeit wm & · τ Tiekosessseie ^ BeoAaft des

»Is ssitsr Esa» fe »eMtr Mis ** · gesohwisidigk # it sm ei & e · wrlsax gewegemta am« asf eim ·. τ »* tO * @ Ve ^ sMLmlten water part« «given»

Jtogi *

neering £ ab @ ratories »ätoaghton, MassaoMesett ·} applied will. Bit Bulsrgeeeiffrimäig & sit will eolsae «» raliit until this-

Ites Teraistkeft is done sedasm at iitaar Mimstea, wlQurcmd die re ^ eratar feel Ι0 · @ % $ · 0 giluilttm throw · W «ft« «r

ti Standea bsi «äatr Ie ^« atar

8880 - 15 *

lets stand for another 15 minutes to achieve a thermal equilibrium. Then the yiskometer ball slowly turns into Gang approved »and afterwards, the maximum initial load has developed, the seer speed is then continuously with a speed iron 21 seoTVaeo. 3 »5 Increased for a long time. After this time has elapsed the shear speed 4500 aeo. "and there is a record of the Soher speed against the Soller load executed on the coordinate paper divided into em The increase in the shear rate noted above, i.e. « 21 seoo "* / see · moves the pen on the graphic Paper with the speed γοη 1 cm along the axis of the Shear speed per 10 see · This is called the "after upward course "when the" upward course "is completed (at about 4,500 aeo." ") the speed is reduced to 0 see "in 13" to 15 see, with the pen during this period of time a "course directed towards the bottom" is set up «here you go the bheogram for the cellulose ether solution is removed » soles

Me thxotropy is then measured by the Area «wipe the" upward facing cart * and the "near downward curve" in om and »ultipliaitrend calculated with a factor of 8.8 χ 10. The aioh resulting «value is called erg / om / see. Aufgtielohnet ·

The strength is determined by the maximum initial load value («tatiseh ·· Iaehgeb« a) the "naoh upwardly directed Kurre * des laeogrammes la em and wiplating old de »factor 420 calculated. (Sien · the • previous fillings and figure 2, as well as the corresponding explanations in the literature TO & Smith and Applegate • adapted above). The aioh resulting value is auffeielöhnet as dyn / om, Di * UmwaÄdlungefaictören for dl "Thixetreple and die eelftstlfktit'll * mtt" Z & hltnwtr-4er Im "trameatkia.i ^ rl * rujn; derived, dl «« ater application

standardized a Tiiköiitä where dl · ·· Oel «dureh da» I «tl« aal Bmr «att of Washington «., D.O, certified · 1 * 4«

8ä880i / 0S8?

* 16 -

The gelatinous ethers, which are improved according to the invention, are for the production of solutions for casting foils, ύοά products for the finishing of textiles, for products of the wasoh industry, for drilling lambs from petroleum wells, as suspending and thickening agents, for cleaning aids, grits, pharmaceutical auxiliaries, Ijaulsionsstabilisatoren, food - and drink stabilizers, including stabilizers for ice cream, as well as adhesives, have been used.In general, the oilulose ethers improved according to the invention are useful where there is a need for a water-soluble and alkali-soluble cellulose ether, which dissolves slightly with the formation of smooth solutions or no grain or thixotropic behavior «inherent,

Eb modifications can be made within the scope of the invention Modifications are made without departing from the spirit and scope thereof

BATH ORIGINAL

8G9ÖQS / Q987 ^:

Claims (1)

Claims 1. Process for the production of alkali cellulose and ethers of the same »characterized in that the Oelluloeematerial is brought into contact with an aqueous alkaline solution in the presence of an inert organic diluent within a temperature range of 0 ' 3O ⁰ C 1 -3 hours , where the weight ratio of the diluent to the cellulose material is 6 to 19 parts of diluent per 1 part of oilulose material »and the diluent from (a) 70 - 96% by volume of a water-miscible inert organic material» (b) 0 - 16% by volume of a large, water-miscible inert organic material and (c) 4-15% by volume of water, and then the resulting alkali cellulose is etherified to form the ether. 2o The method according to claim 1, characterized t that the diluent product at least an aliphatic alcohol with 2-5 carbon atoms contains T 3 · The method of claim Zt characterized in that the Verdünnuagemlttelprodukt Isopropjlalkohol or tert-butyl alcohol aiaes ^ oäer a mixture of these contains Alkbhol · ait methyl alcohol o & qt AethyIalkohol. 4. The method according to any one of the preceding claims, characterized in »that mim. The proportion of alkali before the Isiberulsrungbriiagea of the cellulose material "with the aqueous, alkaline Wewigf and the remaining proportion of the alkali" nmah. dese. ! ». des Gellulosia & terlalBait an aqueous alkaliß @ hesi solution before the Verätheru & geetefe is added «. BATH ORIGINAL