EP0961851A1 - Process for producing fibrous materials with improved properties - Google Patents

Process for producing fibrous materials with improved properties

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Publication number
EP0961851A1
EP0961851A1 EP98904108A EP98904108A EP0961851A1 EP 0961851 A1 EP0961851 A1 EP 0961851A1 EP 98904108 A EP98904108 A EP 98904108A EP 98904108 A EP98904108 A EP 98904108A EP 0961851 A1 EP0961851 A1 EP 0961851A1
Authority
EP
European Patent Office
Prior art keywords
polyester
ƒ
da
characterized
preferably
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.)
Granted
Application number
EP98904108A
Other languages
German (de)
French (fr)
Other versions
EP0961851B1 (en
Inventor
Peter HÄNSSLE
Thomas Rajcsanyi
Ingo Von Medvey
Joachim Werres
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evonik Stockhausen GmbH
Original Assignee
Evonik Stockhausen GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE19704054 priority Critical
Priority to DE19704054A priority patent/DE19704054C2/en
Application filed by Evonik Stockhausen GmbH filed Critical Evonik Stockhausen GmbH
Priority to PCT/EP1998/000304 priority patent/WO1998033970A1/en
Publication of EP0961851A1 publication Critical patent/EP0961851A1/en
Application granted granted Critical
Publication of EP0961851B1 publication Critical patent/EP0961851B1/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

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Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00Pulping cellulose-containing materials
    • D21C3/003Pulping cellulose-containing materials with organic compounds
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00Pretreatment of the finely-divided materials before digesting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00Manufacture of substantially flat articles, e.g. boards, from particles or fibres

Abstract

A process is disclosed for producing fibrous materials for the manufacture of cellulose, paper or wood materials by using at least one dicarboxylic acid dialkyl ester and/or a copolymer of polyester-polyether and/or fatty acid polyol monopolyester, dipolyester, tripolyester and or higher polyester. Fibrous materials with an improved quality and higher yield are thus produced.

Description

A process for producing fibrous materials with improved properties

The invention relates to a method for producing fiber materials for the production of pulp, paper or wood-based panels using at least one dicarboxylic acid dialkyl ester and / or a Fettsäurepolyol- mono-, di-, tri- and / or higher polyesters and / or polyester-polyether copolymers and the products produced from these fibrous materials such as pulp, paper and wood-based panels.

Fibers or fiber raw materials, such as mechanical wood pulps and long-fiber raw materials and, in particular thermo-mechanical pulp (TMP) and Chemi-Thermo Mechanical Pulp (CTMP) are in mechanical pulping by Zerfasung from comminuted wood materials by separation and fibrillation of the individual fibers after thermal won or chemical-thermal treatment (s. this Römpp Chemie Lexikon, 9th edition, 1991, pages 3208 and 4345).

Due to the greater fiber length and brightness TMP is better than wood pulp to replace wood pulp suitable and is therefore used for reasons of cost in the production of bulk printing papers such as rotary printing paper, thin paper and cardboard. In the production of the half pulps one is, as in the pulp production, seek to reduce the solids content of lignin and hemicellulose by delignification and / or oxidative or reductive bleaching process in order to reduce the yellowing of the products prepared with these substances. On the efforts in the bleaching of wood pulps is of HU-sweet and W.Eul in weekly for the Paper Technology 9 (1986) pp 320 - reported in detail 325th It is observed that is dependent on the dosage of bleaching chemicals yellowing of the materials may occur, which impairs the whiteness of stabilization of the products. In DE 41 03 572 C2, is a variant of the known Alcell- or Organocell process, the delignification of plant fiber materials, in particular made of wood chips in such a way that the wood chips are first impregnated throughout with alcohol in order to avoid a fiber-damaging effect of the subsequent alkali Extension , In WO 94/12721 and WO 94/12722 delignification using peracetic acid and complexes are described, followed by bleaching with ozone or sodium dithionite, while AI a multistage peroxide bleaching is carried out under pressure to DE 195 09 401 pulps, and secondary fiber pulp, wherein the complexing agent used to improve the effect of Perhydroxylanions located opposite inside the fibers lignin chromophores.

According to EP 553 649 Bl, the delignification of cellulose pulp with a mixture of monopersulfuric acid and sulfuric acid is carried out with subsequent neutralization.

Since the use of chemicals in the production of CTMP leads to waste water problems, 639 434 Bl it is dispensed by the process for production of wood fiber boards according to EP to remove the chemicals to the digester.

The bleaching of lignocellulosic materials with oxidants and hydroxamic acid compounds using hydroxylamine or a large number of compounds with a N-hydroxy, oxy, N-oxy or N, N'-Dioxi function are described in EP 717143 AI described, wherein esters of the 1-Hydroxybenztriazols, of cinnamic acid, as well as 4-tert. Butylbenzoic be designated as a procedural components.

For fixing resins shares of degradation products of native starch to the pulp suspensions according to WO 95/00704 further added, which are subject to microbiological degradation in the material circulation easily unless countermeasures are taken.

Similarly, should according to DE 195 15 272 AI by alkoxylation of C10 - C22 - carboxylic acid derivatives and / or C10 - C22 carboxylic acids containing OH groups, such. B. be added from soybean or linseed oil products produced, for controlling the deposition of resins, said resins probably dispersed by this method in pulp and / or mechanical pulp suspensions or primary fiber suspensions to avoid disturbances in the process flow of the primary fibers in improved extent to be. Information on the efficacy of these compounds are not given.

In WO 94/29510 and WO96 / 18770 are for the treatment of lignocellulosic materials, multi-component systems comprising oxidising agents and catalysts, as well as mediators from the group of hydroxylamines, hydroxamic acids, the aliphatic, cycloaliphatic, heterocyclic or aromatic compounds with N-hydroxy, oxime, N-oxy or N, N- Dioxi functions and Comediatoren, the aromatic alcohols, carbonyl compounds, aliphatic ethers, phenol ethers and / or olefins are included is described.

The known processes for the production of wood materials are thus characterized by the use of a plurality of complex-acting, various aids, the application has to be checked extensively depending on the raw materials and manufacturing conditions and their effectiveness is limited. It was therefore the task of finding a method for producing fibrous materials that can be carried out without the disadvantages mentioned and can be obtained with equivalent or improved properties in the fibers.

Furthermore, the object was to find means for use in the manufacture of fibrous materials, which the preparation of improved fiber materials, in particular of TMP and CTMP, and the production of improved and less expensive products based on these raw materials, in particular taking account of environmental aspects, such as the restriction of allow use of environmentally hazardous chemicals or the exploitation of raw materials of inferior quality or waste raw materials.

This object is according to the invention by the use of one or more dicarboxylic acid dialkyl ester and / or one or more fatty acid polyol mono-, di-, tri- and / or higher polyesters and / or polyester-polyether copolymers wherein the impregnating pretreatment of the comminuted wood raw materials dissolved.

Accordingly, the invention is a method for producing fiber materials, preferably of mechanical pulps, such as thermomechanical pulp (TMP) and Chemi-Thermo Mechanical Pulp (CTMP) and groundwood pulp, characterized in that during the manufacturing process, particularly in pretreatment for impregnation of comminuted wood raw materials or during the comminution of the wood raw material at least one dicarboxylic acid dialkyl ester and / or one or more fatty acid polyol mono-, di-, tri- and / or higher polyesters and / or polyester polyether copolymers are added.

The invention provides a means for the production of fibers, preferably TMP, CTMP and groundwood pulp, characterized in that the means comprises one or more dicarboxylic acid dialkyl ester and / or one or more fatty acid polyol mono-, di-, tri- and / or higher polyester and / or polyester polyether copolymer contains. It has been found that dicarboxylic acid dialkyl ester and / or fatty acid polyol mono-, di- tri-, and / or higher polyesters and / or polyester polyether copolymers are surprisingly effective in the pretreatment of comminuted wood and / or plant materials, and that the thus primary fibers produced are purified to a greater degree from adhering lignin, resin units and other wood constituents, so that materials having improved optical properties are obtained in the highest yield. According to the invention, the brightness, whiteness, color tint and color saturation of the mechanical pulps are particularly improved, without the other properties, particularly the strength properties of the fibers are impaired.

According to the invention as a dicarboxylic acid dialkyl ester, the dicarboxylic acid dialkyl and / or - diisoalkylester of C2 - C12 dicarboxylic acids with Cl - C13 n- and / or iso-alkanols, such as di-n-butyl oxalate, di-n-butyl malonate, di-n-butyl succinate , di-n-butyl glutarate, di-n-butyl adipate, di-n-butylsuberat, di-n-butyl sebacate, dimethyl adipate, diethyl adipate, di-n-propyladipat, diisopropyl adipate, diisobutyl adipate, di-tert-butyl adipate, di-isoamyladipat, Di n-hexyl adipate, di (2-ethylbutyl) adipate, di- (2-ethylhexyl) adipate, di-n-butyl phthalate, diisodecyl phthalate, dimethyl phthalate, diethyl phthalate, diisobutyl phthalate, di (2-ethylhexyl) phthalate and diisodecyl phthalate and the diester the C9 dicarboxylic acid (trimethyl) and dodecanedioic acid is used.

Likewise, the esters of saturated and / or unsaturated C8 to Cl 8 fatty acids are according to the invention with polyhydric alkanols having 2 to 6 carbon atoms, such as glycol, trimethylolpropane, glycerol, sorbitol, and sorbitan esters of said fatty acids, for. As glycerol and / or glycerol di- and / or Glycerintrifettsäureester, sorbitol mono and --fatty acid esters and sorbitan and / or Sorbitandifettsäureester and / or Sorbitantrifettsäureester used.

Furthermore, so-called have surprisingly Schmutzlöseagentien, which have been used for cleaning or soil Releaseagentien equipment of synthetic fibers, especially polyester-polyether copolymers, as proven for example polyethylene terephthalate and / or polyoxyethylene copolymers as inventive use agent.

Preferably, the esters of adipic acid or ester of sorbitan, are used in this invention and particularly preferred are the adipic acid esters of Cl to C6 n- and / or iso-alkanols, such as dimethyl adipate, diethyl adipate, di-n-isopropyl adipate and diisopropyl adipate, di-n-butyl and / or diisobutyl adipate, and mixed esters of said dicarboxylic acids and alkanols, glycerol trioleate and sorbitan monooleate.

Said esters are used alone or as a mixture in an amount of 0.001 - 5.00 wt%, preferably 0.01 -. 2.0 wt%, and particularly preferably 0.01 -. 1.0% by weight, based on the quantities of wood. and / or plant amount used directly as such or in dissolved or dispersed in liquid form. The esters are used directly or as a diluted or concentrated aqueous or anhydrous solution or 1 in the form of aqueous dispersions. Suitable solvents are, n- and iso-alkanols, liquid hydrocarbons and acetone. The esters can be employed emulsions dispersed, said non-ionic, ionic and amphoteric and in particular nonionic and anionic surfactants are used as emulsifiers either alone or in combination with such water-soluble or water-insoluble solvents.

Suitable nonionic emulsifiers are, for example, oxyalkyl ethers, preferably ethoxylates and / or end-capped ethoxylates of fatty alcohols and fatty acids or oils. Suitable anionic emulsifiers are alkyl and / or aryl sulphonates, α-olefin sulfonates, α- sulfo fatty acid esters, and alkyl sulfates and ether Sulfobernsteinsäureeester and carboxymethylated ethoxylates and soaps. The preparation according to the invention to be used in the, preferably stable emulsions is also known. For example, the hydrophobic phase containing the Esterkomponente is entered in the aqueous emulsifier phase and dispersed with stirring or pumping.

The dicarboxylates listed above invention and / or Fettsäurepolyol- mono- and / or - polyester and / or polyester polyether copolymers can together with other components, namely liquid derivatives of vegetable or animal oils or fats, such as Rapsölmethylester, rapeseed oil methyl ester, Palmölmethylester, Sojaölmethylester and Talgfettmethylester and synhetischen Esterölen be used. Preferably, the addition of said esters in the form of an aqueous concentrated or diluted dispersion, which are, if necessary with the addition of nonionic, anionic or cationic surfactants, alone or in combination with water-soluble or water-insoluble solvents, in a known manner is performed. The inventive use agents can also the digestion of raw materials based on other suitable plant materials, eg. B. from cereal straw or the digestion of long-fiber raw materials from reed, cane, parts of oil palms and / or other C4 plants, are used in particular in the defibration in the refiner or in the digester, from which wood-fiber plates are produced, for example.

The inventive method for producing fiber materials, in particular for the production of TMP, CTMP and groundwood next for the preparation of refiner (refiner mechanical pulp) as well as by chemical pretreatment refiner produced (Chemical-Mechanical Pulp refiners) are suitable.

In the inventive method preferably comminuted wood, in particular wood chips from softwood or hardwood are used fresh or stored state as starting materials. Similarly, wood chips are suitable from sawmill waste or other waste of wood or of breaking wood. The raw materials mentioned can by the novel process together with other fibers, such. B. recycled materials are processed.

The manufacture of mechanical pulps with high yield occurs under known process conditions, the wood chips are supplied by pre-attenuation and uniform moistening of the impregnator. There is effected for example according to the invention, the addition of at least one dicarboxylic acid dialkyl ester and / or one or more fatty acid polyol mono-, di-, tri- and / or higher polyester and / or polyethylene terephthalate and / or polyoxyethylene copolymers separately or together with water and optionally a further impregnating liquid. Under compression, the chips are uniformly impregnated and after 1 - 60 min, preferably 15 - 30 min permanent or momentary, 110 min, preferably 15 min continuous preheating to 110-180 ° C, preferably 140-170 ° C of the first refiner fed, takes place in turn, under pressure between the grinding discs under predetermined load conditions, the recording Seperierung into individual fibers and defibration / fibrillation. The refiner is then optionally fed after passing through the grinding zone and steam separating a Refinernachmahlung in a second refiner stage. At this stage, or separately, eg. B. in a steam-heated pulper can usually an additional treatment with chemicals such. B. latency removal and bleaching the pulp to be made. The addition of the inventive agent to be used can be performed at any point prior to the actual mechanical, taking place under defibration development of the pulp or the plant materials, for example in the production of groundwood pulp separately or together with the introduced into the grinding zone water.

By the inventive addition of the dicarboxylic acid dialkyl ester and / or one or more fatty acid polyol mono-, di-, tri- and / or higher polyester and / or polyether polyester, preferably polyethylene terephthalate and / or polyoxyethylene terephthalate copolymers according to the 1st refiner obtain a pulp Tnit increased brightness and whiteness. The mechanical pulp may be subjected to bleaching in addition, the increase in brightness and whiteness with constant opacity remain as well as the strengths of the fibers, in particular the values ​​of the tenacity, the tensile breaking load work and all or nearly obtained. The lignin content of the fabric weight in accordance with the invention using the said ester is about 1.% Reduced. In the inventive use of the agent together with vegetable oil derivatives such as Rapsölmethylester, an increased value of the wood extract is determined.

The process can also be carried out in such a way that they will not while maintaining the previously unattainable brightness and whiteness to the additional bleaching or in such a way that the bleaching is carried out under clearly saving the amount of chemicals. In this way, a subsequent yellowing of the fibrous materials can be avoided by the addition of alkalis in particular. Furthermore, according to the invention to be used in dicarboxylic acid dialkyl ester and / or one or more fatty acid polyol mono-, di-, tri- and / or higher polyester and / or Polyethylenphthalat- and / or polyoxyethylene copolymers are used as agents for the chemical treatment of wood chips, from which are prepared by the known processes pulp or wood-based panels or precursors thereof.

The following examples demonstrate in a complementary manner, the invention:

Example 1-3

The manufacture of TMP was performed in a plant for the production of high-yield pulps having the following characteristics: flow rates 40 - 65 kg otro / h

Volume of the preheater 110 dm 3 (lim 3)

Imprägnatorvolumen 15 dm 3 (1.5 m 3)

1. refiner:

- drive power 160 kw

- speed 1800 - 3600 rpm "

Grinding set diameter 300 mm

2. refiner:

- drive power 160 kw

- Speed 1485 rpm "

The experiments were carried out at a Refinerdrehzahl of 3000 rpm 'at 143 ° C and a pressure of 0.35 bar, wherein the specific energy input for comparison of material properties with addition of the means by changing the grinding gap was adjusted to zero while the power the speed and the temperature and pressure and the flow rate remained constant.

40 kg pre-sorted chips wt, with a moisture content of at least 30th%, based on oven-dry wood substance were each deaerated chips funnel by presteaming, equally durchgefeuchtet and placed over auger to the treater by a residence time of about 15 minutes, the chips squeezed in compression and with continuous metered addition of the impregnation liquid from a reservoir set at a uniform impregnation. As impregnating agents of di-n-butyl adipate, glycerol trioleate and glycerol trioleate in combination with Rapsölmethylester in a ratio of 1: 1 is used, the weight in the state of an aqueous emulsion consisting of 14% of the agent and 8 wt% of a nonionic emulsifier based on a.. ethoxylated fatty alcohol or a hochethoxyethylierten vegetable oil used. The amount used was in each case 2.8 g / kg wood chips. In the preheater, they were shortly exposed during 20 minutes to a further treatment at temperatures of 110 and 160 ° C and then 2 of the auger 1. refiner fed CD type 300th The resulting Refinersto ff was blown after leaving the grinding zone to a cyclone where the separation of steam and pulp was done. An aliquot of the TMP produced was fabricated at a fabric weight of 10 degrees.%, Of a bleach (bag bleach) using 1, 8% water glass, 0.5% chelating agent, 1.8% NaOH and 3.8% H 2 O 2 ( the percentages by weight relate in each case subjected to the used amount of pulp). The bleached pulp was washed and SO to a pH value in the range of 8.0 - 8.5 acidified.

The assessment of optical properties was carried out by sheet formation to Rapid-Köthen. For this purpose (% by about 20. Dry substance), for example, 500 g TMP were pitched in 10 1 of tap water in the pulper. Per Sheet Stoffeinwaage was 375 g.

Table 1 contains the manufacturing data and the data of TMP produced wherein the abbreviations mean:

Wspec: spec. energy support

Meal: freeness

EWZ: drainage time

TP2, an indication of the average fiber lye

(Starting from 3 mm corresponding to 100%) R: shive content

Table 1

Table 2 contains the data of the optical properties of the unbleached and bleached TMP.

table 2

The data of the examples show that the brightness and whiteness when using the compositions of the invention by 3 - 4 points increase. The increase compared to the same pattern remains, as well as the opacity obtained when additional bleaching of the TMP is performed.

After the prescribed procedure more samples of TMP were produced. Here were used:

Example 4 Di-n-butyl amount of 5.6 kg / t 5 Di-n-butyl adipate and Rapsölmethylester (1: 1) 5.6 kg / t 6 glycerol trioleate 5.6 kg / t 7 sorbitan monooleate 5.6 kg / t 8 polyester / polyether copolymer 5.6 kg / t (soil release PES ET 1/30 Hüls AG) 9 glycerol trioleate 2.8 kg / t

10 glycerol trioleate 1.4 kg / t

The assessment of the TMP values ​​widerum after sheet formation in the manner indicated. The data are summarized in Table 3 below.

table 3

a bleach obtained TMP 10, as stated above, subjected - Further, a respective test set of examples according to the fourth Thereafter, 300 g of the substance of approximately 20% TS with tap water to 10% DM (dry matter) was diluted and sheet formation 30 s stirred with a blender. The data are summarized in Table 4 below.

table 4

The values ​​of Tables 3 and 4 indicate that a significant improvement in whiteness, brightness, hue and saturation can be achieved.

Claims

Patentanspr├╝che
1. A process for producing fibrous materials, characterized in that at least one da├ƒ Dicarbons├ñuredialkylester and / or one or more Fetts├ñurepolyol mono-, di- at ​​the pretreatment for Impr├ñgnieren of comminuted wood raw material and / or plant materials, -tri - and / or h├╢here polyester and / or polyester polyether copolymer, preferably a polyethylene terephthalate and / or polyoxyethylene terephthalate copolymer may be added.
2. The method according to claim 1 characterized in that at least one daß Dicarbonsäuredialkylester and / or one or more Fettsäurepolyol mono-, di-, tri- and / or höhere polyester and / or polyester-polyether copolymers are preferred, polyethylene terephthalate and / or polyoxyethylene terephthalate copolymers in an amount of 0.005 - 5.0 wt%, preferably 0.01 -. 2.0 wt%, and particularly preferably 0.01 -. 1.0 wt% based on the. wood or plant amount used may be added.
3. A process according to Ansprüchen 1 and 2, characterized in that the fibrous daß a mechanical pulp, preferably thermomechanical pulp, Chemi-Thermo Mechanical Pulp or pulp is.
4. A process according to Ansprüchen 1 - 2 characterized in that the fibrous daß a long-fiber raw material of the reed, cane, parts of Ölpalmen and other C4 plants is.
5. A process according to Ansprüchen 1 to 4 characterized in daß as Dicarbonsäuredialkylester the Adipinsäureester of Cl - are added to C6 n- and / or iso-alkanols.
6. A process according to Anspr├╝chen 1-4 characterized in da├ƒ Fetts├ñurepolyol- as mono-, di-, tri- and / or polyester h├╢here the esters of ges├ñttigten and / or unges├ ñttigten C8 - 18 Fetts├ñuren ​​with polyhydric alkanols, preferably glycol, trimethylolpropane, glycerol, sorbitan and sorbitol, especially sorbitan monostearate and / or glycerol trioleate, are added.
7. A process according to Ansprüchen 1-7 characterized in daß the Dicarbonsäure used, and dialkyl esters or Fettsäurepolyol- mono, - di, - tri-, and / or höhere polyester and / or polyester-polyether copolymers, preferably polyethylene terephthalate - and / or Polyoxiethylenterephtalat copolymers are added in the form of a wässrigen emulsion.
8. A process according to Ansprüchen 1-7 characterized in daß the Dicarbonsäuredialkylester and / or Fettsäurepolyol- mono-, di-, tri, -, and / or höhere polyester and / or polyester - polyether copolymers preferably polyethylene terephthalate and / or copolymers Polyoxyethylenterephtalat- weight together with one or more derivatives of vegetable or animal Öle in an amount of 0.001 to 5.000%, preferably 0.01 -. 2.00% by weight, particularly preferably 0. , 01 - 1.00% by weight based » be used on the used wood or plant amount..
9. The method according to claim 8 characterized in daß as derivatives of vegetable or animal Ölen Rapsölmethylester, Palmölmethylester, Sojaölmethylester, Rübölmethylester and / or Talgfettmethylester and / or synthetic Esteröle be added.
10. A method according to Ansprüchen 1 - 9 characterized in, daß the optionally subsequent bleaching is durchgeführt using reduced amounts of chemicals.
11. A method according to Ansprüchen 1 - 9 characterized daß, is omitted zusätzliche bleach.
12. Use of at least one Dicarbonsäuredialkylesters and / or one or more Fettsäurepolyol mono-, di-, tri- and / or höherer polyester and / or one or more polyester-polyether copolymers, preferably a polyethylene terephthalate and / or polyoxyethylene terephthalate copolymers in the manufacture of pulp, paper or wood-based panels.
EP98904108A 1997-02-04 1998-01-21 Process for producing fibrous materials with improved properties Expired - Lifetime EP0961851B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19704054 1997-02-04
DE19704054A DE19704054C2 (en) 1997-02-04 1997-02-04 A process for producing fibrous materials with improved properties
PCT/EP1998/000304 WO1998033970A1 (en) 1997-02-04 1998-01-21 Process for producing fibrous materials with improved properties

Publications (2)

Publication Number Publication Date
EP0961851A1 true EP0961851A1 (en) 1999-12-08
EP0961851B1 EP0961851B1 (en) 2003-01-08

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Country Status (9)

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US (1) US6344108B1 (en)
EP (1) EP0961851B1 (en)
JP (1) JP2001509845A (en)
CN (1) CN1252111A (en)
AT (1) AT230814T (en)
CA (1) CA2279524A1 (en)
DE (1) DE19704054C2 (en)
NO (1) NO993554D0 (en)
WO (1) WO1998033970A1 (en)

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DE19704054C2 (en) 2000-08-10
NO993554D0 (en) 1999-07-20
JP2001509845A (en) 2001-07-24
CN1252111A (en) 2000-05-03
US6344108B1 (en) 2002-02-05
EP0961851B1 (en) 2003-01-08
WO1998033970A1 (en) 1998-08-06
AT230814T (en) 2003-01-15
NO993554L (en) 1999-07-20
CA2279524A1 (en) 1998-08-06
DE19704054A1 (en) 1998-08-06

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