| Patents for D21H 21 - Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper impregnating or coating material, characterised by its function, form or properties (20,755) |
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| 06/04/1991 | US5020581 Process for inserting rigid segments in security paper |
| 05/30/1991 | WO1991007285A1 Watermarked plastic support |
| 05/30/1991 | WO1991007128A1 Treated duster |
| 05/29/1991 | EP0428933A2 Materials coated with plate like pigmets |
| 05/29/1991 | DE3939034A1 Herstellung stabiler polymerdispersionen mittels amphoterer polymerer als stabilisatoren Preparation of stable polymer dispersions by means of amphoteric polymeric stabilizers as |
| 05/28/1991 | US5019606 Aqueous solutions of polyamidoamine-epichlorohydrin resins, and preparation and use thereof |
| 05/22/1991 | EP0428489A1 The use of a coated paper for the manufacture of an instant lottery ticket |
| 05/22/1991 | EP0428447A1 Security paper comprising a new security thread reacting to falsification |
| 05/22/1991 | EP0427847A1 Security paper for producing documents |
| 05/21/1991 | US5017268 Filler compositions and their use in papermaking |
| 05/15/1991 | EP0427040A1 Paper-coating compositions comprising whitening agents |
| 05/15/1991 | EP0426801A1 Security document with embedded security element with visually and mechanically verifiable distinguishing signs. |
| 05/14/1991 | US5015334 Colloidal composition and its use in the production of paper and paperboard |
| 05/14/1991 | CA1284004C Aqueous dispersions, a process for their preparation and their use as sizing agents |
| 05/10/1991 | WO1991007543A1 A process for the production of paper |
| 05/10/1991 | WO1991007351A1 Silica sols, a process for the production of silica sols and use of the sols |
| 05/09/1991 | WO1991007350A1 Silica sols, a process for the production of silica sols and use of the sols |
| 05/08/1991 | EP0426404A1 Antifoaming and defoaming compositions |
| 05/08/1991 | EP0426391A2 Synthetic resin emulsion, process for producing it and coating compositions comprising it |
| 05/08/1991 | EP0425975A1 A process for wetting a paper web and microcapsules used in the process |
| 05/08/1991 | DE3929108A1 Wet strength paper is prepd. |
| 05/07/1991 | US5013794 Amide or imide derivatives of maleic anhydride polymers, paper sizing |
| 05/05/1991 | CA2029220A1 Brightener-containing paper-coating compositions |
| 05/01/1991 | CA2028708A1 Antifoaming and defoaming compositions |
| 04/30/1991 | US5011731 Paper embedded with treads; high strength disposable product |
| 04/30/1991 | US5011534 Degritting, spray drying, pulverizing, roasting and repulverizing |
| 04/30/1991 | CA1283747C Copolymeric compositions for dispersing pitch |
| 04/28/1991 | WO1991006217A1 A process of combatting microorganisms |
| 04/24/1991 | EP0311642A4 Temperature adaptable textile fibers and method of preparing same |
| 04/23/1991 | US5010190 Cationic compounds |
| 04/23/1991 | CA1283259C Process for controlling pitch deposition from pulp in papermaking systems |
| 04/18/1991 | WO1991005108A1 Fibres of increased specific surface area, a method for their manufacture, fluff pulp consisting of such fibres and the use of the fibres as absorption material |
| 04/18/1991 | WO1991005106A1 Aluminium-salt impregnated fibres, a method for their manufacture, fluff consisting of such fibres, and the use of the fibres as absorption material |
| 04/17/1991 | EP0423038A1 Method for authentication of an object by means of electron spin resonance, apparatus for implementing this method and object to be used with it |
| 04/17/1991 | EP0156924B1 Chemically active composition containing ferrous ion |
| 04/16/1991 | US5008344 Cationic copolymers containing acrylic aldehyde, amide and ester monomers |
| 04/16/1991 | US5008306 Mixing aqueous dispersion of ionic dispersant and fibers and second, oppositely charged, dispersion of polymer powder; adding high molecular weight ionic polymer flocculant, draining, drying |
| 04/16/1991 | US5008023 Biocidal compositions and use thereof containing a synergistic mixture of glutaraldehyde and 2-(decylthio) enthanamine |
| 04/16/1991 | CA1282913C Security paper containing vesiculated beads |
| 04/11/1991 | DE3933235A1 Flame retardant paper - is impregnated with organic aluminate salt soln. and coated with wax or silicone |
| 04/10/1991 | EP0421172A1 Method of clouring or tinting paper |
| 04/04/1991 | WO1991004361A1 Encapsulated retainer for aqueous liquids, and process for its preparation |
| 04/03/1991 | EP0419964A2 Red iron oxide or brown iron oxide microbeads, their preparation and their use |
| 04/02/1991 | US5004327 Light-polarizing material in the form of sheets or of a web and a method for the manufacture of the material |
| 04/02/1991 | CA1282211C Pitch control process utilizing quaternized polyamine ionene polymer |
| 03/28/1991 | CA2026120A1 Iron oxide red and iron oxide brown microgranulates, a process for their preparation and their use |
| 03/27/1991 | EP0419206A1 Vesiculated polymer granules and paper made therefrom |
| 03/27/1991 | EP0418343A1 Process for manufacturing paper, paperboard and cardboard in the presence of copolymerizates containing n-vinyl formamide units. |
| 03/26/1991 | US5002636 Security paper for currency and bank notes |
| 03/20/1991 | EP0374196A4 Method of reducing pitch in pulping and papermaking |
| 03/20/1991 | CN2073437U Disposable composite-paper for insolating germs |
| 03/19/1991 | US5001229 Water soluble basic dyestuffs |
| 03/13/1991 | EP0415932A1 Fire-retardant |
| 03/06/1991 | EP0415880A2 Light stabilised inks |
| 03/05/1991 | US4997895 Aqueous dispersion of cationic polymer |
| 03/05/1991 | US4997893 Graft copolymers, a process for their preparation and their use |
| 03/05/1991 | US4997870 Spray drying |
| 03/05/1991 | US4997523 Alkoxylated diamine, phosphate or phosphonate |
| 02/28/1991 | DE4026255A1 Novel sulphonated aromatic cpds. useful as dispersants |
| 02/27/1991 | EP0413716A1 Method of making a water-sensitive substrate water-resistant and rigid in the wet state, and composition for carrying out the method |
| 02/26/1991 | US4995944 Antideposit agents for recycled papers; release agents |
| 02/21/1991 | WO1991001791A1 Process for treating a porous substrate to achieve improved water and oil repellency |
| 02/19/1991 | US4994562 Fiber-reactive formazan dyes containing α,β-dihalopropionylamino, α-haloacryloylamino or haloacetilamine |
| 02/19/1991 | US4994146 Creping adhesive utilizing polymer-polymer complex formation |
| 02/19/1991 | CA1280544C Vesiculated polymer granular compositions and paper made therefrom |
| 02/19/1991 | CA1280259C Method of making a water laid fibrous web containing one or more fine powders |
| 02/14/1991 | DE3924846A1 Aq. paper-coating material with high solids content - contains pigment mixt. of coarse calcium carbonate and non-film-forming polymer dispersion, and synthetic polymer binder dispersion |
| 02/13/1991 | EP0412905A1 Security paper |
| 02/12/1991 | US4992324 Absorbent flexible board |
| 02/06/1991 | EP0411400A2 Basic condensates |
| 02/06/1991 | CN1011519B Process for making paper |
| 01/31/1991 | DE3924898A1 Toilet paper which disinfects and cleans skin - comprises thin parchment or synthetic paper layer and is coated or impregnated with water and active agents |
| 01/25/1991 | WO1991001409A1 Cell wall loading of never-dried pulp fibers |
| 01/24/1991 | DE3924051A1 Whitening paper coating compsn. with anionic white toner |
| 01/23/1991 | EP0409028A1 Optical bleaching process for paper coatings and optical bleaching compositions used for this process |
| 01/22/1991 | CA2021559A1 Process for the whitening of paper coating compositions and also whitener preparations for this process |
| 01/22/1991 | CA1279158C Security paper |
| 01/16/1991 | EP0408424A1 Method and device for high-security encyphered marking to protect high-value objects |
| 01/15/1991 | US4985120 Method for controlling pitch deposits in pulp and papermaking processes with organotitanium (IV) compound |
| 01/15/1991 | US4984824 Microscopic |
| 01/10/1991 | WO1991000390A1 Document security method and system |
| 01/09/1991 | EP0407257A2 Microcapsules containing amphiphilic hydrosoluble substances |
| 01/09/1991 | EP0406550A1 Process for the preparation of purified calcium sulfate dihydrate from aqueous solutions |
| 01/09/1991 | EP0406461A1 Paper sizing agent containing a cationic dispersant |
| 01/09/1991 | EP0406406A1 Process for preparing basic aluminum compounds. |
| 01/06/1991 | CA2020396A1 Paper sizing agent containing a new cationic dispersing agent |
| 01/02/1991 | CN1048149A Improvements relating to smoking articles |
| 01/01/1991 | US4981675 Polymeric basic aluminum silicate-sulphate |
| 01/01/1991 | US4981636 Fibre reinforced plastics structures |
| 01/01/1991 | US4981557 Acrylamide or ester type cationic polymer |
| 12/31/1990 | CA2019224A1 Microcapsules containing watersoluble amphiphilic substances |
| 12/27/1990 | EP0404580A1 Improvements relating to smoking articles |
| 12/27/1990 | EP0404030A1 Method for coating substrates with UV curable epoxysilicone compositions |
| 12/27/1990 | CA1278209C Method for the manufacture of a material in the form of sheets or a web provided with a watermarklike pattern |
| 12/25/1990 | US4980238 Aqueous dispersion of cationic polymer |
| 12/25/1990 | US4980025 From celulosic fiber pulp where anionic aluminum silicates or aluminum modified silicic acid and cationic polyacrylamide are added; improved drainage/retention |
| 12/22/1990 | CA2013339A1 Method for coating substrates with uv curable epoxysilicone compositions |
| 12/19/1990 | CN1047900A Stencil paper with heat-sensitive resin display layer |
| 12/18/1990 | US4978427 Water-soluble copolymers containing vinylamine units as wet strength and dry strength agent for paper |
| 12/13/1990 | DE3918765A1 Sicherheitspapier zur herstellung von dokumenten Security paper for production of documents |