US2357962A - Manufacture of laminated webs of cellulose ester fibers - Google Patents

Manufacture of laminated webs of cellulose ester fibers Download PDF

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Publication number
US2357962A
US2357962A US347566A US34756640A US2357962A US 2357962 A US2357962 A US 2357962A US 347566 A US347566 A US 347566A US 34756640 A US34756640 A US 34756640A US 2357962 A US2357962 A US 2357962A
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US
United States
Prior art keywords
fibers
cellulose
esterification
manufacture
strips
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 - Lifetime
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US347566A
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English (en)
Inventor
Leemann Hans
Rheiner Alfred
Hagenbuch Werner
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FIRM SANDOZ Ltd
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FIRM SANDOZ Ltd
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/20—Chemically or biochemically modified fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B3/00—Preparation of cellulose esters of organic acids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/185—Substances or derivates of cellulose
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/02—Synthetic cellulose fibres

Definitions

  • the electrical properties for example the insulating power and the hygroscopic nature of the cellulose ester fibers manufactured While maintaining their structure depend in the first place on the degree of esterification, it is probable that the milling of the esterified cellulose fibers absolutely necessary for the adhering layer formation, exposes new surfaces which are less esterified and consequently show less favorable properties.
  • fibrous cellulose ester strips, sheets, layers or webs of any kind can be manufactured which have extraordinarily good electrical properties and a very high stability to water, if the milling takes place either before the esterification, during the esterification or even after the actual esterification provided that in the latter case it takes place still in the esterification mixture itself and the formation of layers is carried out subsequently with the avoidance of any injury to the fibres.
  • the lamination or formation of sheets can take place as desired directly from the esterification mixture, possibly after the rendering inactive of the esterification catalyst or catalysts or after the dilution of the esterification mixture with lower fatty acids, or organic solvents, which do not tend to dissolve the esterified fibers, or even not until after the separation of the fibers from the acetylation mixtures and subsequent washing out but preferably still in the moist swollen condition, that is before drying.
  • the laminated strips of cellulose ester fibers thus manufactured are not inferior in electrical properties to the laminated strips of cellulose ester fibers obtained by the esterification of preformed laminated cellulose strips but even show just as good or even better electrical properties as for example those shown by fibrous cellulose ester yarns or fabrics manufactured from cotton yarns or fabrics maintaining their structure.
  • the estcrification of the cellulose fibers with maintenance of their fibrous structure can be carried out according to known processes with lower and higher fatty acid derivatives to any degree of estcrification desired in the presence or absence of organic solvents in which the resulting cellulose esters are insoluble.
  • the known esterification accelerators may be used preferably those which do not form any stable compounds with the cellulose during the esterification and during later washing out, such as for example the known acid reacting catalysts, such as the hydrogen halide acids, perchloric acid, halogenated carboxylic acids, organic sulphonic acids etc.
  • the polyvalent mineral acids which themselves form cellulose esters such as for example free sulphuric or phosphoric acid are less suitable; further the halogens, or salt-like catalysts, such as zinc chloride, tin chloride, ferric chloride, copper sulphate or perchlorates can be used. Naturally mixtures of all the usable catalysts of the most varied kinds may be used.
  • the formation of layers of fibrous cellulose ester can take place in known manner on sieves or filters, that is for example by means of the usual paper pulp devices for the manufacture of paper strips, long sieves, drum filters etc. If the formation of layers takes place directly from the esterification mixture or after the dilution thereof, it is naturally advisable owing to the chemical attack on thevapparatus to use a closed apparatus of as simple as possible a nature.
  • the fibrous cellulosic material is hydroextracted, washed in water and finally homogeneously suspended in water. From this suspension sheets, strips, layers of paper and cardboard etc. can be formed in the well known manners.
  • Sheet papers and cardboards formed from this suspension of esterified cellulosic materials in water have a tensile strength which is below the usual one found with such materials. If the fibers have been washed absolutely free from the acetylation mixture the tensile strength is low;
  • this tensile strength can be greatly improved by a simple additional process consisting of an aftertreatment with aliphatic carboxylic acid in vapor or liquid form, such as e. g. acetic acid.
  • aliphatic carboxylic acid in vapor or liquid form, such as e. g. acetic acid.
  • the sheet paper, strip, cardboard etc. passes through a bath of glacial acetic acid or acetic-acid diluted with water. The acid is afterwards completely recovered by evaporation and the paper etc. has then greatly improved in tensile strength.
  • cellulose esters are capable of swelling or are soluble in certain organic solvents, the strips of cellulose esters can have their physical form altered by the action of such solutions and swelling agents. All these details can naturally be varied to an extraordinary extent according to the intended use, and do not depend directly on the essence of the invention, whichis the careful manufacture of laminated strips of cellulose ester fibers from esterified fibers. Naturally strips of the most varied thickness of layer, from the thinnest tissue paper to the thickest cardboard can be manufactured by this process.
  • strips of cellulose ester fibers are resistant to micro-organisms, i. e. they are resistant to putrefying bacteria, molds, fungi, etc, and are not devoured by quite a large number of insects even for example by termites.
  • Such strips of cellulose ester fibers can therefore be used, not only as'electrical insulation material, but also as packing material for foodstufis, for bandages, for wall paper insensitive to dampness, or in the form of paste board even directly as building material, as well as for a whole series of other technical purposes.
  • Example 1 Bleached linters are previously dried and carefully milled in a closed apparatus corresponding to the usual hollander at a somewhat raised constant temperature in an acetylation mixture suitable for the manufacture of slightly acetylated cellulose fibers, consisting of acetic anhydride, anhydrous acetic acid and zinc chloride as catalyst until the esterification has proceeded completely to a stage corresponding to cellulose monoacetate. Then the acetylation mixture is diluted with anhydrous acetic acid and the loose fibers worked up in a known manner to a strip of cellulose acetate fibers for example by means of an evacuable perforated roller. The fiber strip obtained is freed as completely as possible from adhering acetylation mixture by warming in a current of air, thoroughly washed and dried.
  • an acetylation mixture suitable for the manufacture of slightly acetylated cellulose fibers, consisting of acetic anhydride, anhydrous acetic acid and zinc chloride as catalyst until
  • the fibers swell more or less strongly during the acetylation depending on the intensity of the milling, so that the formation of the fibrous strip on the rotating roller takes place more easily or with more difficulty. If milling is efiected energetically during the whole of the acetylation a completely homogeneous pulp of fibers results, which can no longer filter very well and is therefore worked up more easily by pouring into water and molding to a paper strip from aqueous suspension.
  • the cellulose ester strips resulting show good mechanicaland electrical properties, namely a high tearing strength, an outstanding power of insulation, a small power factor, and a small dielectric constant, further a very good resistance to Water.
  • the values obtained are just as high as those of a strip of paper, manufactured from linters and then esterified to the monoacetate stage, the structure being maintained completely.
  • linters for example under exactly the same conditions are converted into cellulose monoacetate and milled in aqueous suspension for the purpose of paper manufacture, then the insulating properties diminish with the increasing degree of milling to a fraction of the original value.
  • the insulating power of linters for example esterified to the monoacetate stage amounts to approximately 1,000,000 megohms per gram of fibrous material at 500 volts direct current, 80% relative atmospheric humidity and C., then paper manufactured therefrom by milling in water and molding to a strip of cellulose ester fibers shows an insulation power which diminishes depending on the degree of milling.
  • the paper manufactured therefrom still shows for example a tenth part of the original insulation resistance, namely approximately 100,000 megohms per gram; alter milling for an hour only a hundredth part namely approximately 10,000 megohms per gram, alter two hours milling only a five hundredth part, namely only approximate- 1y 2,000 megohms per gram fibrous material.
  • a fibrous cellulose strip manufactured from ground linters when subsequently esterified to the monoacetate stage under the same conditions likewise shows an insulation power of approximately 1,000,000 megohrns per gram.
  • Example 2 Purified cotton spinning waste is milled in 95% acetic acid in a pin mill until a homogeneous fibrous pulp results, centrifuged and esterified in an acetylating mixture of acetic anhydride, acetic acid, and an organic liquid which prevents the solution of the resulting higher cellulose acetates, such as low boiling parafiin hydrocarbons (benzine) aromatic hydrocarbons (benzene, toluene, solvent naphtha etc), halogenated hydrocarbons (carbon tetrachloride, chlorobenzene, etc.) and perchloric acid as a catalyst, the esterification is carried out up to an acid content of 60% that is almost until the triacetate stage, and after the addition of a quantity of sodium acetate corresponding to the perchloric acid and an excess of the organic liquid used, molded on a closed round or long sieve machine to a highly esterified cellulose acetate strip.
  • an organic liquid which prevents the solution of the
  • the resulting cellulose ester strip is freed as far as possible from adhering liquid by warming, dried, washed and calendered on hot rollers.
  • the insulating power of the highly esterified cellulose acetate fiber strip under the same conditions of measurement as those described in Example 1 shows an insulation value of over 50 million megohms per gram.
  • the highly acetylated cellulose fibers can also be freed thoroughly from excess acetylation mixture, suspended in water, thoroughly washed and the subsequent layer formation carried out from the aque-
  • the dried highly esterified cellulose acetate fiber strip can if necessary be subjected to a further treatment with Water vapor under pressure, the insulating nower and resistance to water being somewhat further improved.
  • Example 3 Disintegrated sodium cellulose obtained by treatment of wood cellulose with aqueous alkaline solutions is esterified to the stage corresponding to cellulose monoacetate in the known manner with gentle stirring or circulation of the bath in an acetylation mixture of acetic anhydride, glacial acetic acid and 1.5-naphthalene disulphonic acid at raised temperature, the esi'erification mixture cooled and the monoacetate fibers in the mixture are milled in a ball-mill until a sample gives a perfect layer formation, the 1.5-naphthalene disulphonic acid converted into the sodium salt by the addition of sodium acetate diluted with acetic acid, and molded in a closed round sieve machine to a cellulose monoacetate fiber strip, washed and dried. During the relatively short milling period the acetic acid content of the fibers rises only slightly.
  • the insulating power of a cellulose inonoacetate fiber strip amounts to values of over million megohms per gram, whereas paper prepared by the subsequent milling in aqueous solution of sodium cellulose fibers which have been acetylated to the stage corresponding to monoacetate while retaining their structure only shows an insulating power of approximately 2,000 megohms per gram, that is not even a hundredth part of that of the cellulose acetate fiber strip manufactured according to the process of this invention.
  • the esterification is carried beyond the monoacetate stage, for example to an acetic acid content of 36-40%, then the cellulose acetate fiber strips show a parchment paper like character.
  • cotton or sodium cellulose instead of the cotton or sodium cellulose; mentioned in Examples 1-3, naturally other fibers consisting of cellulose or cellulose containing fibers can be used as the starting material, such as for example other types of cellulose, wood shavings, bast fibers as well as linen, hemp (manila hemp), ramie, as well as old paper or rags which consist of cellulose fibers or even fibers of regenerated cellulose, such as artificial silk spinnerette Waste from viscous or cuprammonium silk etc.
  • other fibers consisting of cellulose or cellulose containing fibers can be used as the starting material, such as for example other types of cellulose, wood shavings, bast fibers as well as linen, hemp (manila hemp), ramie, as well as old paper or rags which consist of cellulose fibers or even fibers of regenerated cellulose, such as artificial silk spinnerette Waste from viscous or cuprammonium silk etc.
  • acetic acid ester given in the examples other individual or mixed cellulose ester fibers manufactured while maintaining the structure such as fibers of cellulose propionate, -butyrate, ,-acetobutyrate, -laurate, -acetostearate etc. can be molded to cellulose ester strips accordingto the present process.

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  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Organic Insulating Materials (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
US347566A 1939-08-11 1940-07-25 Manufacture of laminated webs of cellulose ester fibers Expired - Lifetime US2357962A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH215950T 1939-08-11

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US (1) US2357962A (de)
CH (1) CH215950A (de)
DE (1) DE737527C (de)
FR (1) FR866668A (de)
GB (1) GB535932A (de)

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736652A (en) * 1954-08-18 1956-02-28 Ohio Commw Eng Co Fibrous products comprising fibers bonded with dextran xanthate
US2736653A (en) * 1953-06-15 1956-02-28 Erickson Donald Robert Manufacture of paper containing hydroxyethyl cellulose
US2784135A (en) * 1954-04-30 1957-03-05 American Cyanamid Co Process for the manufacture of polyacrylonitrile films and laminates
US2869973A (en) * 1954-08-25 1959-01-20 Du Pont Synthetic paper sheet of chemically bonded synthetic polymer fibers and process of making the same
US2887429A (en) * 1957-05-27 1959-05-19 Eastman Kodak Co Method of preparing webs from cellulose esters
US2976205A (en) * 1955-09-09 1961-03-21 Eastman Kodak Co Preparation of webs and sheets from cellulose esters
US2992156A (en) * 1958-03-03 1961-07-11 Eastman Kodak Co Method of treating paper prepared from partially acetylated cellulose fibers
US3047391A (en) * 1959-01-12 1962-07-31 Eastman Kodak Co Method of coating partially acetylated paper with plasticized cellulose ester and resulting paper coated with a photographic emulsion
US3057755A (en) * 1959-01-12 1962-10-09 Eastman Kodak Co Treatment of paper composed of partially acylated cellulose fibers
US3068116A (en) * 1959-01-12 1962-12-11 Eastman Kodak Co Manufacture of partially acetylated paper
US3420734A (en) * 1965-04-02 1969-01-07 Crown Zellerbach Corp Process of forming electrostatic printing paper from ionic fibrous cellulosic derivatives and paper thereof
US20200063371A1 (en) * 2018-08-23 2020-02-27 Eastman Chemical Company Tissue product comprising cellulose acetate
US11230811B2 (en) 2018-08-23 2022-01-25 Eastman Chemical Company Recycle bale comprising cellulose ester
US11286619B2 (en) 2018-08-23 2022-03-29 Eastman Chemical Company Bale of virgin cellulose and cellulose ester
US11299854B2 (en) 2018-08-23 2022-04-12 Eastman Chemical Company Paper product articles
US11306433B2 (en) 2018-08-23 2022-04-19 Eastman Chemical Company Composition of matter effluent from refiner of a wet laid process
US11313081B2 (en) 2018-08-23 2022-04-26 Eastman Chemical Company Beverage filtration article
US11332885B2 (en) 2018-08-23 2022-05-17 Eastman Chemical Company Water removal between wire and wet press of a paper mill process
US11332888B2 (en) 2018-08-23 2022-05-17 Eastman Chemical Company Paper composition cellulose and cellulose ester for improved texturing
US11339537B2 (en) 2018-08-23 2022-05-24 Eastman Chemical Company Paper bag
US11390991B2 (en) 2018-08-23 2022-07-19 Eastman Chemical Company Addition of cellulose esters to a paper mill without substantial modifications
US11390996B2 (en) 2018-08-23 2022-07-19 Eastman Chemical Company Elongated tubular articles from wet-laid webs
US11401660B2 (en) 2018-08-23 2022-08-02 Eastman Chemical Company Broke composition of matter
US11401659B2 (en) 2018-08-23 2022-08-02 Eastman Chemical Company Process to produce a paper article comprising cellulose fibers and a staple fiber
US11408128B2 (en) 2018-08-23 2022-08-09 Eastman Chemical Company Sheet with high sizing acceptance
US11414791B2 (en) 2018-08-23 2022-08-16 Eastman Chemical Company Recycled deinked sheet articles
US11414818B2 (en) * 2018-08-23 2022-08-16 Eastman Chemical Company Dewatering in paper making process
US11420784B2 (en) 2018-08-23 2022-08-23 Eastman Chemical Company Food packaging articles
US11421385B2 (en) * 2018-08-23 2022-08-23 Eastman Chemical Company Soft wipe comprising cellulose acetate
US11441267B2 (en) 2018-08-23 2022-09-13 Eastman Chemical Company Refining to a desirable freeness
US11466408B2 (en) * 2018-08-23 2022-10-11 Eastman Chemical Company Highly absorbent articles
US11479919B2 (en) 2018-08-23 2022-10-25 Eastman Chemical Company Molded articles from a fiber slurry
US11492757B2 (en) 2018-08-23 2022-11-08 Eastman Chemical Company Composition of matter in a post-refiner blend zone
US11492756B2 (en) 2018-08-23 2022-11-08 Eastman Chemical Company Paper press process with high hydrolic pressure
US11492755B2 (en) 2018-08-23 2022-11-08 Eastman Chemical Company Waste recycle composition
US11512433B2 (en) 2018-08-23 2022-11-29 Eastman Chemical Company Composition of matter feed to a head box
US11519132B2 (en) 2018-08-23 2022-12-06 Eastman Chemical Company Composition of matter in stock preparation zone of wet laid process
US11525215B2 (en) 2018-08-23 2022-12-13 Eastman Chemical Company Cellulose and cellulose ester film
US11530516B2 (en) 2018-08-23 2022-12-20 Eastman Chemical Company Composition of matter in a pre-refiner blend zone
US11639579B2 (en) 2018-08-23 2023-05-02 Eastman Chemical Company Recycle pulp comprising cellulose acetate
CN116333173A (zh) * 2023-05-31 2023-06-27 成都普什医药塑料包装有限公司 一种醋酸纤维素及其制备方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE563841A (de) * 1956-04-26
US3096231A (en) * 1960-04-18 1963-07-02 Eastman Kodak Co Method of manufacturing paper from partially esterified cellulose fibers
US3103462A (en) * 1960-04-18 1963-09-10 Eastman Kodak Co Method of improving the strength characteristics of paper prepared from partially acylated cellulose fibers
CN103132169B (zh) * 2011-11-30 2015-09-16 中国科学院理化技术研究所 一种能稳定分散的纤维素纳米纤维的制备方法

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736653A (en) * 1953-06-15 1956-02-28 Erickson Donald Robert Manufacture of paper containing hydroxyethyl cellulose
US2784135A (en) * 1954-04-30 1957-03-05 American Cyanamid Co Process for the manufacture of polyacrylonitrile films and laminates
US2736652A (en) * 1954-08-18 1956-02-28 Ohio Commw Eng Co Fibrous products comprising fibers bonded with dextran xanthate
US2869973A (en) * 1954-08-25 1959-01-20 Du Pont Synthetic paper sheet of chemically bonded synthetic polymer fibers and process of making the same
US2976205A (en) * 1955-09-09 1961-03-21 Eastman Kodak Co Preparation of webs and sheets from cellulose esters
US2887429A (en) * 1957-05-27 1959-05-19 Eastman Kodak Co Method of preparing webs from cellulose esters
US2992156A (en) * 1958-03-03 1961-07-11 Eastman Kodak Co Method of treating paper prepared from partially acetylated cellulose fibers
US3047391A (en) * 1959-01-12 1962-07-31 Eastman Kodak Co Method of coating partially acetylated paper with plasticized cellulose ester and resulting paper coated with a photographic emulsion
US3057755A (en) * 1959-01-12 1962-10-09 Eastman Kodak Co Treatment of paper composed of partially acylated cellulose fibers
US3068116A (en) * 1959-01-12 1962-12-11 Eastman Kodak Co Manufacture of partially acetylated paper
US3420734A (en) * 1965-04-02 1969-01-07 Crown Zellerbach Corp Process of forming electrostatic printing paper from ionic fibrous cellulosic derivatives and paper thereof
US11390991B2 (en) 2018-08-23 2022-07-19 Eastman Chemical Company Addition of cellulose esters to a paper mill without substantial modifications
US11414818B2 (en) * 2018-08-23 2022-08-16 Eastman Chemical Company Dewatering in paper making process
US11286619B2 (en) 2018-08-23 2022-03-29 Eastman Chemical Company Bale of virgin cellulose and cellulose ester
US11299854B2 (en) 2018-08-23 2022-04-12 Eastman Chemical Company Paper product articles
US11306433B2 (en) 2018-08-23 2022-04-19 Eastman Chemical Company Composition of matter effluent from refiner of a wet laid process
US11313081B2 (en) 2018-08-23 2022-04-26 Eastman Chemical Company Beverage filtration article
US11332885B2 (en) 2018-08-23 2022-05-17 Eastman Chemical Company Water removal between wire and wet press of a paper mill process
US11332888B2 (en) 2018-08-23 2022-05-17 Eastman Chemical Company Paper composition cellulose and cellulose ester for improved texturing
US11339537B2 (en) 2018-08-23 2022-05-24 Eastman Chemical Company Paper bag
US20200063371A1 (en) * 2018-08-23 2020-02-27 Eastman Chemical Company Tissue product comprising cellulose acetate
US11390996B2 (en) 2018-08-23 2022-07-19 Eastman Chemical Company Elongated tubular articles from wet-laid webs
US11401660B2 (en) 2018-08-23 2022-08-02 Eastman Chemical Company Broke composition of matter
US11401659B2 (en) 2018-08-23 2022-08-02 Eastman Chemical Company Process to produce a paper article comprising cellulose fibers and a staple fiber
US11408128B2 (en) 2018-08-23 2022-08-09 Eastman Chemical Company Sheet with high sizing acceptance
US11414791B2 (en) 2018-08-23 2022-08-16 Eastman Chemical Company Recycled deinked sheet articles
US11230811B2 (en) 2018-08-23 2022-01-25 Eastman Chemical Company Recycle bale comprising cellulose ester
US11420784B2 (en) 2018-08-23 2022-08-23 Eastman Chemical Company Food packaging articles
US11421387B2 (en) * 2018-08-23 2022-08-23 Eastman Chemical Company Tissue product comprising cellulose acetate
US11421385B2 (en) * 2018-08-23 2022-08-23 Eastman Chemical Company Soft wipe comprising cellulose acetate
US11441267B2 (en) 2018-08-23 2022-09-13 Eastman Chemical Company Refining to a desirable freeness
US11466408B2 (en) * 2018-08-23 2022-10-11 Eastman Chemical Company Highly absorbent articles
US11479919B2 (en) 2018-08-23 2022-10-25 Eastman Chemical Company Molded articles from a fiber slurry
US11492757B2 (en) 2018-08-23 2022-11-08 Eastman Chemical Company Composition of matter in a post-refiner blend zone
US11492756B2 (en) 2018-08-23 2022-11-08 Eastman Chemical Company Paper press process with high hydrolic pressure
US11492755B2 (en) 2018-08-23 2022-11-08 Eastman Chemical Company Waste recycle composition
US11512433B2 (en) 2018-08-23 2022-11-29 Eastman Chemical Company Composition of matter feed to a head box
US11519132B2 (en) 2018-08-23 2022-12-06 Eastman Chemical Company Composition of matter in stock preparation zone of wet laid process
US11525215B2 (en) 2018-08-23 2022-12-13 Eastman Chemical Company Cellulose and cellulose ester film
US11530516B2 (en) 2018-08-23 2022-12-20 Eastman Chemical Company Composition of matter in a pre-refiner blend zone
US11639579B2 (en) 2018-08-23 2023-05-02 Eastman Chemical Company Recycle pulp comprising cellulose acetate
CN116333173A (zh) * 2023-05-31 2023-06-27 成都普什医药塑料包装有限公司 一种醋酸纤维素及其制备方法

Also Published As

Publication number Publication date
DE737527C (de) 1943-07-16
CH215950A (de) 1941-07-31
GB535932A (en) 1941-04-28
FR866668A (fr) 1941-08-25

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