baber/WOPTO huggingface dataset:
Patent CS-484788-A3 (CS)
Title: Process for producing oxidation product based on two or a plurality ofmetals
Inventor: RAPP ROBERT ANTHONY
IPC: C04B35/65
Filed: 1988-07-04
Abstract: A complex oxidation reaction product of two or more metals in an oxidized state is formed by positioning a suitable precursor metal (1) adjacent to a permeable mass (2) of a metal-containing compound in an oxidizing atmosphere and heating the assembly to form a body of molten precursor metal. The molten metal infiltrates the permeable mass (2) and reacts therewith and with the oxidizing atmosphere to form a complex oxidation reaction product. Methods for determining the shape of the resulting article are described. The disclosed methods can be used to form superconducting perovskites.
Patent CZ-109199-A3 (CZ)
Title: Three-layer paving for roads
Inventor: GOACOLOU HONOR
IPC: E01C7/18
Filed: 1997-10-02
Abstract: The invention concerns a novel road structure in which the bearing portion on top of the ground comprises three successive layers of bituminous material bonded with one another, viz.: a base layer which rests on the ground with optional insertion of a forming layer of thickness Hi such that: 4 cm </= Hi </= 10 cm. and of elastic modulus: Ei; a median layer of thickness Hm such that: 4 cm. </= Hm </= 20 cm. and of elastic modulus Em such that: 2000 MPa < EM < 8000 MPa; a top layer of thickness Hs such that: 4 cm. </= Hs < 10 cm. and of elastic modulus Es, said elastic moduli of said layers complying with relationship of inequality (a) and (b).
Patent CZ-161294-A3 (CZ)
Title: Watertight lock for sheet piles
Inventor: DECKER JEAN
IPC: E02D5/06
Filed: 1994-07-01
Abstract: The invention relates to watertight claw couplings (14) for sheet piling comprising at least one housing (30) inside one of the claws (14) and in which at least one seal (18) is located. <IMAGE>
Patent CZ-193693-A3 (CZ)
Title: Building element made of foamy material absorbing and/or insulating acoustic waves, process of its manufacture and use
Inventor: LAHNER STEFAN DR
IPC: B22F3/11
Filed: 1993-09-17
Abstract: In the case of a sound-damping and/or sound-insulating and heat-insulating element of lightweight construction, in which the cell walls (3a) of foamed pores or cells (3), forming a foam body (8), consist substantially of aluminium or an aluminium alloy, the foam body is formed by a workpiece (7) which is deformed by heating and has a compacted mixture of powdered aluminium (9) or a powdered aluminium alloy and powdered blowing agent (10) and, if need be, powdered aluminium oxides (11). Since the material is, to the greatest extent, a monomaterial, simple metal recycling is possible. <IMAGE>
Patent CZ-202395-A3 (CZ)
Title: Cover, particularly for hydrant maintenance hole
Inventor: ZINSIUS JOSEPH
IPC: E02D29/14
Filed: 1995-08-08
Abstract: The cover (6) is surrounded by a supporting frame (4) with guide rails (8) along two opposite side walls. The cover has upper (58) and lower (56) lugs on each side to engage with the guide rails, mounted on supporting legs (52) extending from the cover's lower surface and perpendicular to it. Each leg has a flat section (59) which prevents any pivoting of the cover as it is raised or closed. Each guide rail has a rear section (28C) which frees the cover, while each of the frame's opposite side walls has a locking rib (36) which is situated at least partially above the upper lug forming a chicane for the lugs to pass through.
Patent CZ-209094-A3 (CZ)
Title: Fuel injection pump
Inventor: KLOPFER KENNETH H
IPC: F02M59/46
Filed: 1994-08-30
Abstract: The rotary distributor fuel injection pump has a drive shaft (66) coupled to a pump rotor (12) by a radially offset and axially extending drive pin (68) with a cylindrical head received within a radial slot (20) in the rotor (12); a coaxial throughbore in the rotor (12) providing a valve bore (32); a valve member (10) in the valve bore (32) axially shiftable to an open position by a compression spring; an electromagnet (11) with an armature plate (172) fixed to one end of the valve member (10) and a stator (170) operable, when energized, to axially shift the valve member (10) to its closed position; a stop plate (120) on the outer end of the rotor (12) having an outer end face engageable by the armature plate (172), the end face having a plurality of lands and grooves to hydraulically dampen the axial movement of the valve member (10) to its open position when the stator (170) is deenergized; the armature plate (172) having a hub received within an opening in the stop plate (120) to couple the armature plate (172) and valve member (10) to the rotor (12); an annular thrust washer (22) and needle bearing (34) between the rotor (12) and a distributor head (42); the distributor head (42) having a rotor support sleeve (40) with an inner annular cantilever section (45) thermally coupled to the rotor (12); the rotor (12) having distributor and balancing bores, each with an inlet port equidistant between the radial axes of adjacent pumping plunger bores.
Patent CZ-211195-A3 (CZ)
Title: Attachment of foot straps of windsurfing boards
Inventor: NAMUR MARC
IPC: B63H9/00
Filed: 1995-08-17
Abstract: The fixture is for the foot loop straps of surf boards. Fixture rails (6) are spaced apart on the board top in the board body. They contain an insert slot (37), a back cut (36) and a top side positioning groove (39) for insertion of bolt pins (40) with a pivot grip (41). The bolt pins fit rotatably in fixture plates (42) at the ends of the foot loop straps and have a bolt lug formation (44) matching the insert slot of the bores (36) in the fixture rails. By rotation of a bolt pin inserted in the accommodation bore of the fixture rail corresponding to the selected positions of the foot loop strap, the pin enters into engagement with the bolt lug formation with the back cut of the accommodation bore.
Patent CZ-225593-A3 (CZ)
Title: Catalyst and method of ethylene and other alpha olefins polymerization
Inventor: LUCIANI LUCIANO
IPC: C08F4/6592
Filed: 1993-10-25
Abstract: A catalyst active in the polymerization of alpha-olefins is formed by:   (a) a bis(cyclopentadienyl) bis(amide) derivative of an element of Group IVB of the Periodic Table of the Elements, to be defined by means of the formula : <CHEM> wherein M represents a metal of Group IVB, each of R<1>, R<2>, R<3> and R<4>, and Cp have the same meaning as reported in the disclosure, and   (b) an aluminoxane co-catalyst.   This catalyst finds use in the processes of ethylene and other alpha-olefins polymerization and copolymerization.
Patent CZ-235494-A3 (CZ)
Inventor: FIDRANT JIRI ING
IPC: E01B27/20
Filed: 1994-09-27
Abstract: Úsek kolejnice (1) i s pražci (2) se nadzvedne, načež se pěchováním
a tlakem vytvářejí ve štěrkové vrstvě pod
jednotlivými pražci (2) zhutněné štěrkové sloupečky, a to
po obou stranách každé kolejnice (1) v odstupech po délce
pražců (2), odpovídajících místům působení zhutňovacích
pěchů (12,13,14), na kterých se pak pražce výškově usadí.
Zhutněné štěrkové sloupečky se současně vytvářejí pod
pražci (2) v oblasti pod patou kolejnice (1). Zhutněné
štěrkové sloupečky je možno rozšiřovat po délce pražce (2)
opakovaným pěchováním štěrku (6) pod pražec (2). Po usazení
pražců (2) se zhutňuje štěrk (6) v oblastech mezi pražci
(2) až do hloubky pod jejich spodními plochami, kde se tak
vytvoří zhutněná vrstva navazující na zhutněné štěrkové
sloupečky pod pražci (2).Po stranách přivrácených k oběma
kolejnicím (1) jsou k soustavě (5) zhutňovacích pěchů (12,
13) přiřazeny vnitřní zhutňovací pěchy (14), které jsou připevněny
k nosné konstrukci výkyvné ve směru pod patu kolejnice
(1).
Patent CZ-261997-A3 (CZ)
Title: Triazine derivatives
Inventor: KUBOTA MINEYUKI
IPC: C07D251/18
Filed: 1996-02-19
Abstract: The present invention relates to a triazine derivative of the general formula (I), <CHEM> (wherein X<1> is a linear or branched C1 SIMILAR C4 alkyl group or a halogen atom, n is an integer of 0 or 1 to 4, provided that when n is 2 or more, a plurality of substituents X<1> may be the same or different, and R<1> is a linear or branched C1 SIMILAR C10 alkyl group which may be substituted with 1 to 4 C1 SIMILAR C4 alkoxy groups and/or hydroxy groups, provided that when the linear or branched C1 SIMILAR C10 alkyl group is substituted with 2 or more C1 SIMILAR C4 alkoxy groups and/or hydroxy groups, a plurality of the C1 SIMILAR C4 alkoxy groups and/or hydroxy groups may be the same or different), a process for the production thereof, and a herbicide containing the above compound. The present invention provides a novel triazine derivative which shows remarkably excellent crops-weeds selectivity under the bad conditions of an excessive water content, etc., which are liable to cause phytotoxicity, and a herbicide containing it as an active ingredient.
Patent CZ-310698-A3 (CZ)
Title: Lowly foaming liquid cleansing agents and their use
Inventor: BAERS PETER JOHANNES MARIE
IPC: C11D1/52
Filed: 1997-03-25
Abstract: A liquid detergent comprising a silicone suds suppressor and a short chain length amine surfactant selected from the formulas (i)-(viii) : R1 - NH2 R1 - N(R2)2 R1 - N(R2)2 ->O R1 - (CO) - N (CH2)3 - N (R3)2 R1 - (CO) - N (CH2)3 - N (R3)2 ->O R1 - (CO) - N (CH2)2 - N (R3)2 ->O R1 - (CO) - N Ä(CH2)2-OÜx - N (R3)2 ->O and mixtures thereof wherein R1 is a linear, branched, cyclic, saturated or unsatured alkyl group having 6 to 10 carbons atoms; R2 is a hydrogen or methyl group; R3 is independently selected from a hydrogen, methyl, CH2CH2OH, polyethoxy or polypropoxy group and x is between 1 to 5.
Patent CZ-320598-A3 (CZ)
Title: Pyrazole derivatives, process of their preparation and their use as a medicament
Inventor: SCHINDLER URSULA DR
IPC: A61P11/06
Filed: 1998-10-05
Abstract: 3-(2-Furanyl, -thienyl or -pyrrolyl)-pyrazole or -indazole derivatives (I) are new. Pyrazole derivatives of formula (I) and their stereoisomers, stereo isomer mixtures and salts are new: X = O, S, NH or N(Me); R1, R1a = wither (i) H, halo, OR6, NR7R8, COOR9, COR10, CONR11R12, CONR12OR11, S(O)mR13, SO2NR14R15, CN or NO2; or (ii) A, aryl, arylalkyl, cycloalkyl, cycloalkylalkyl, Het or Het-alkyl (all optionally substituted by one or more R5); A = 1-10C alkyl; R2-R4 = as R1 (ii); or R2 + R3 = 5-7 membered carbocyclic ring, optionally containing double bond(s) and/or substituted by one or more R5; n = 0-2; R5 = as R1 (i) (excluding H) or CF3 or 1-5C alkyl; R6-R15 = H; or A, aryl, arylalkyl, cycloalkyl, cycloalkylalkyl, Het or Het-alkyl (all optionally substituted by one or more of halo, 1-5C alkyl, OR18, NR19R20, COOR21, COR22, CONR23R24, CONR24OR23, S(O)mR25, SO2NR26R27, CN, NO2 or CF3); R6-R8,R11,R14 can also = COR16 or SO2R17; R16, R18-R27 = H or as R17; R17 = 1-6C alkyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, Het or Het-alkyl; or R18-R20, R23, R26 can also = COR16 or SO2R17; or NR7R8, NR11R12, NR14R15, NR19R20, NR23R24, NR26R27 = 5-7 membered (un)saturated heterocycle, optionally containing a further N, O or S heteroatom and/or substituted by one or more halo and/or alkyl; unless specified otherwise alkyl moieties have 1-4C, cycloalkyl 3-7C and aryl 6-14C; provided that: (1) R5 can only = NO2 if R1a = H, R2 + R3 = optionally substituted benzene ring and n = 0 and R4 is not unsubstituted phenyl; (2) R4 is not H if n = 0; (3) (I) are excluded where: R1 = H, A', COOH, COOA', CH2OH, CH2OA' or halo in the 5-position; R1a = H; R2 + R3 = benzene ring (optionally monosubstituted by A', halo, OH or OA'); n = 1; and R4 = phenyl (optionally monosubstituted by A', halo, OH or OA'); and (4) (I) are excluded where: X = S; R1 = Cl in the 5-position; R1a,R3 = H; R2 = Me; n = 0; and R4 = (Me)2N-CO-CH(Me)-; and A' = 1-3C alkyl.   An Independent claim is included for the preparation of (I).
Patent CZ-334197-A3 (CZ)
Title: Apparatus for transfer of a thread being continuously supplied to exhaust on a rotation empty tube
Inventor: GREIS DIETMAR
IPC: B65H54/34
Filed: 1997-10-22
Abstract: A bobbin winder assembly, to lead the yarn end to an empty bobbin sleeve, has a retainer formed by the first yarn guide (31) at a controlled drive (33). The drive moves the yarn guide (31) from a guide retention position into a yarn release setting, in a swing movement. The second yarn guide is the opening (30) of a suction unit. When the yarn is to be caught through the catch (4), the first yarn guide (31) is moved to the empty bobbin sleeve (7) and the second yarn guide (30) is located away from the sleeve (7), so that the tensed yarn between them can be brought into the movement path of the rotating catch (4).
Patent CZ-426799-A3 (CZ)
Inventor: MAUBRU MIREILLE
IPC: A61K8/49
Filed: 1998-05-06
Abstract: Prostředek pro přímé použití pro oxidační barvení
keratinových vláken, zejména lidských keratinových vláken,
jakojsou vlasy, zahrnující v prostředí vhodnémpro barvení,
alespoňjedno heterocyklické oxidační barvivo a alespoňjeden
enzymtypu oxidoreduktázy se dvěma elekrony v přítomnosti
alespoňjednoho donorů pro uvedený enzym a postupu barvení
za použití tohoto prostředku.
Patent SK-100693-A3 (SK)
Title: Pharmaceutiacal composition for the treatment of prostatic hyperplasia containing a 5-alpha-reductase inhibitor and an antiandrogen
Inventor: GORMLEY GLENN J
IPC: A61K31/58
Filed: 1992-03-19
Abstract: Disclosed is an improved treatment for men with benign prostatic hyperplasia (BPH), involving combination therapy of a 5 alpha -reductase inhibitor, e.g. a 17 beta -substituted 4-azasteroid, a 17 beta -substituted non-azasteroid, 17 beta -acyl-3-carboxy-androst-3,5-diene, benzoylaminophenoxybutanoic acid derivative, fused benz(thio)amide or cinnamoylamide derivative, aromatic 1,2-diethers or thioethers, aromatic ortho acylaminophenoxy alkanoic acids, orthothioalkylacylaminophenoxy alkanoic acids, pharmaceutically acceptable salts and esters thereof, and particularly finasteride, in combination with an  alpha 1-adrenergic receptor blocker, i.e., terazosin. The combination provides therapy at the molecular level for the underlying cause of the disease as well as providing symptomatic relief. Pharmaceutical compositions useful for treatment are also disclosed.
Patent SK-116494-A3 (SK)
Title: Bis-arylcarbinol derivatives, pharmaceutical preparations and their use
Inventor: WONG JESSE
IPC: A61K31/4427
Filed: 1993-03-24
Abstract: PCT No. PCT/US93/02418 Sec. 371 Date Sep. 23, 1994 Sec. 102(e) Date Sep. 23, 1994 PCT Filed Mar. 24, 1993 PCT Pub. No. WO93/20080 PCT Pub. Date Oct. 14, 1993The invention is drawn to bridged bis-aryl carbinol compounds of formula (I):    <IMAGE>  (I)  wherein, a, b, c, d, Q, Z, L and R1-R9 are as defined in the specification, their pharmaceutical composition and method of using them in treating asthma, allergy and inflammation.
Patent SK-123293-A3 (SK)
Title: Hcv genomic sequences for diagnostics and therapeutics
Inventor: CHA TAI-AN
IPC: C07K16/00
Filed: 1992-05-08
Abstract: A compsn. is claimed comprising a non-naturally occurring nucleic acid having a non-HCV-1 nucleotide sequence of 8 or more nucleotides corresponding to a nucleotide sequence within the hepatitis C virus (HCV) genome. The nucleotide sequence corresp. to a non-HCV-1 nucleotide sequence within the HCV genome may be selected from regions consisting of the NS5 region, envelope 1 region, 5' UT region and the core region.
Patent SK-137898-A3 (SK)
Title: Process and device for the separation of viscoplastic materials such as plastics from materials such as paper which can be defibrated by mechanical action
Inventor: FAHRBACH GERHARD DR
IPC: B03B1/04
Filed: 1997-04-17
Abstract: The invention relates to a process for separating tenaciousl y elastic materials such as plastics and rubber from materials te aring and/or defiberising under high mechanical stress, particula rly paper, and to a device for performing said process. The proce ss is characterised in that the mixture of materials to be separa ted is subjected to high radial, axial and tangential acceleratio n forces, whereby a mass flow of shredded fibrous material and a mass flow of substantially unshredded plastics is with drawn sepa rately. The device for performing the process consists of a scree n basket which is cylindrical or preferably polygonal in shape an d has borings in its jacket to let the defiberised material pass through, a rotatable driving shaft being arranged coaxially insid e the screen basket, with blades being attached to said driving s haft, preferably in rigid connection.
Patent SK-143997-A3 (SK)
Title: Aqueous suspension and process for the manufacture thereof
Inventor: SZEKELY ISTVAN
IPC: A01N25/30
Filed: 1996-04-19
Abstract: The subject of the invention is an aqueous suspension containing: 0.1-20 % by mass beta-cypermethrin, 0-40 % by mass other pesticide substance, 1-10 % by mass surface active substances in total and within this, 1-5 % by mass ethoxylated polyaryl-phenol-phosphate or sulfate, 0.1-25 % by mass mineral and/or synthetic silicates, 0.1-1 % by mass synthetic silicic acid and up to 100 % by mass other auxiliary materials and water as dispersant.
Patent SK-152897-A3 (SK)
Title: Use of gabapentin compositions for production of a medicament
Inventor: PANDE ATUL C
IPC: A61K31/215
Filed: 1996-04-26
Abstract: The present invention is a novel therapeutic use of gabapentin of general formula (I), wherein R1 is H, or lower alcyl and n is integral number from 4 to 6, and also their pharmaceutically acceptable salts. The compounds are useful in the treatment of mania and the preventative treatment of bipolar disorder.
Patent SK-182789-A3 (SK)
Title: Apparatus for catalytic combustion of organic compounds
Inventor: WOJCIECHOWSKI JERZY
IPC: B01D53/86
Filed: 1989-03-24
Abstract: Air containing impurities is circulated through two layers (4, 7) of a ceramic packing acting as a heat regenerator and through two layers of a catalyst (5,6) of gas cleaning processes. At the same time a part of gases is taken off to the outside, from the space (18) enclosed between two layers of the said catalyst, through a third catalyst layer (8). Gases containing combustible impurities or a combustible component are fed to the reactor through a reversion valve (3). They can be additionally enriched with a liquid or gaseous fuel, by batching the fuel to the stream of gases directly before the third catalyst bed. A catalytic in a form of a metal cylinder (21) is used, inside which there are catalytic-regenerative chambers, and in its upper part, on the cover, a cylinder is mounted, inside which the third bed of the catalyst applied in processes of catalytic after-burning of gases is placed.
Patent SK-282019-A3 (SK)
Inventor: BENKO MILAN
IPC: B64C11/38
Filed: 2018-05-28
Abstract: Mechanizmus automatického sklápania a natáčania listov vrtule stálych otáčok pozostáva z valca (3) s hydraulickým piestom (1). Valec (3) je pevne uchytený cez nosníky (21) hydraulického valca o prírubu (20) mechanizmu vrtule. Stredom hydraulického piesta (1) je vedená prečerpávacia rúrka (2) oleja, na ktorej je uložené posuvné ťahadlo (9), ktoré je, na natáčanie vrtuľových listov, cez mechanizmy (11) a cez rotačné platne (12) s čapmi (18) prepojené s upínačmi (7) listov (8) vrtule. Na sklápanie vrtuľových listov je koniec hydraulického piesta (1) spriahnutý s upínačmi (7) listov (8) vrtule cez pákový mechanizmus tvorený prvým sklápacím/vyklápacím ťahadlom (6), druhým sklápacím/vyklápacím ťahadlom (5) a tretím sklápacím/vyklápacím ťahadlom (4). Do oblúka tvarované vodiace lišty (16) so žliabkom, do ktorých sa pri natáčaní vrtuľového listu zasúva/vysúva bežec (15), ktorý je na konci tretieho sklápacieho/vyklápacieho ťahadla (4), sú uchytené o prírubu (20) mechanizmu vrtule a o nosníky (21) hydraulického valca. O nosníky (21) sú uchytené aj stredové kĺby (22) druhého sklápacieho/vyklápacieho ťahadla (5) pákového mechanizmu. Druhé a tretie sklápacie/vyklápacie ťahadlo (5, 4) pákového mechanizmu majú spájacie/rozpájacie členy (A) pákového mechanizmu.
Patent SK-391691-A3 (SK)
Inventor: HINDLEY RICHARD MARK
IPC: C07D277/42
Filed: 1991-12-19
Abstract: Sú opísané tiazolidindiónové deriváty všeobecného
vzorca (I), kde A2 znamená skupinu vzorca (e), R1
znamená atóm vodíka, Ci.6alkyl, C^acyl alebo benzyl,
R2 a R3 znamenajú atómy vodíka alebo spoloCne tvoria
jednoduchú chemickú väzbu, n je celé čislo 2 až 6 a A1
znamená niektorú zo skupín uvedených v opisnej časti.
Ďalej je opísaný farmaceutický prostriedok s ich obsahom
a ich použitie na liečenie a/alebo prevenciu hyperglykémie
alebo hyperlipidémie.
Patent WO-03023934-A3 (WO)
Title: Système de connexion pour accumulateur de réserve
Inventor: KOEBERL HEIMO
IPC: H02J7/14
Filed: 2002-09-05
Abstract: Système de connexion pour accumulateur de réserve, en particulier batterie auxiliaire (HB) pour une batterie, spécialement batterie de démarrage (SB) pour un véhicule à moteur. Selon la présente invention, pour pouvoir maintenir le fonctionnement en cas de défaillance de la batterie de démarrage (SB), les batteries (SB, HB) peuvent être connectées entre elles par l'intermédiaire d'un interrupteur (V1) ouvert en fonctionnement normal et pouvant être commandé. Au moins un détecteur (Tp3) surveille la tension de la batterie de démarrage (SB) et un circuit, par ex. un comparateur (K3), évalue les signaux produits par le détecteur, la sortie dudit circuit étant connectée à l'entrée de commande (G) de l'interrupteur (V1) pouvant être commandé.
Patent AT-513093-A3 (AT)
Title: Gehörschulungsgerät
Inventor: JAUCH EIKE MATHIAS DR
IPC: A61B5/12
Filed: 2013-07-02
Abstract: Die vorliegende Erfindung betrifft ein Gehörschulungsgerät, mit und beidem ein Trainierender das Erkennen einer punktuellen Sprachnutzschallquelle aus einem stereophonen Sprachstörschall heraus trainieren können soll.
Patent BE-1000123-A3 (BE)
Title: Procede de fabrication de masses adhesives contenant des polymeres, e xemptes de solvants, presentant une bonne stabilite thermique, et leur utilisation.
Inventor: FRANK ANNIGHOFER
IPC: C08G18/80
Filed: 1987-01-23
Granted: 1988-04-12
Abstract: L'invention concerne la préparation et l'utilisation de masses adhésives thermiquement stables, contenant des polymères et exemptes de solvants, obtenues par la réaction de polyesters ou de copolyesters saturés avec un isocyanate masqué, sous l'influence de la chaleur, et si nécessaire, en présence de catalyseurs, avec augmentation sensible de la viscosité, éventuellement par réticulation.
Patent BE-1004873-A3 (BE)
Title: Perfectionnements relatifs a l'appreciation de pistes de cibles.
IPC: G01S13/72
Filed: 1987-12-30
Granted: 1993-02-16
Abstract: L'invention procure un procédé et un appareil pour déterminer si une cible nouvellement signalée peut être corrélée avec des pistes de cibles déjà emmagasinées dans une base de données. La corrélation est effectuée dans des étapes rejetant les pistes de cibles emmagasinées non corrélables et acceptant des pistes de cibles étroitement corrélées, et le dispositif comprend des moyens d'application de décision pour n'accepter une piste de cible emmagasinée comme piste correlée que dans des conditions restreintes.
Patent BE-1011784-A3 (BE)
Title: Procede de blanchiment de pate a papier.
Inventor: CHAUVEHEID ERIC
IPC: D21C9/10
Filed: 1998-03-10
Granted: 2000-01-11
Abstract: Procédé de délignification et de blanchiment de pâte à papier chimique comprenant une étape de traitement acide visant à réduire d'au moins 10 % la quantité d'acides hexèneuroniques présents dans la pâte, une étape d'ajustement du pH de la pâte visant à déposer ou à redéposer des ions de métaux alcalino-terreux sur les fibres de la pâte, l'addition d'un agent chélatant à la pâte avant et/ou pendant l'étape de traitement acide et/ou avant, pendant ou après l'étape d'ajustement du pH, une étape de lavage de la pâte et une étape de traitement de la pâte avec un oxydant, l'agent chélatant étant choisi parmi l'acide aspartique et ses dérivés substitués sur l'atome d'azote.