103790 ⎘
Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers; Polyurethanes from polyethers
LOW FREE POLYURETHANE PREPOLYMER COMPOSITION
#2METHOD FOR REDUCING COEFFICIENT OF FRICTION OF A LAMINATE COMPRISING A POLYURETHANE ADHESIVE
#3DYNAMIC POLYURETHANE ADHESIVES
#4REACTIVE POLYURETHANE HOT MELT ADHESIVE WITH IMPROVED ADHESION TO METALS
#5ADHESIVE COMPOSITION, PRODUCTION METHOD THEREFOR, ADHESIVE, PATCH, WEARABLE DEVICE, AND WEARABLE DEVICE KIT
#6TWO-COMPONENT COMPOSITION
#7EPOXY-TERMINATED ISOCYANATE PREPOLYMERS, AND PROCESS FOR THE PREPARATION THEREOF
#8DEBONDABLE COMPACT PU MATERIALS
#9POLYURETHANE RESIN COMPOSITION AND PREPARATION METHOD THEREFOR
#10Retort Adhesive Composition
#11MOISTURE-CROSSLINKABLE COMPOSITION
#12TWO-COMPONENT LOW-DENSITY PU STRUCTURAL ADHESIVE, PREPARATION METHOD THEREFOR AND APPLICATION THEREOF
#13PRESSURIZED AEROSOL ADHESIVE COMPOUND
#14POLYURETHANE AQUEOUS DISPERSION, ADHESIVE, SYNTHETIC LEATHER AND PAINT
#15Process for Forming a Laminate
#16Moisture-curable Polyurethane Hot Melt Adhesive Composition
#17TWO-COMPONENT POLYURETHANE ADHESIVE COMPOSITION
#18TWO-COMPONENT POLYURETHANE ADHESIVE COMPOSITION
#19Solvent-free Polyurethane Adhesive Composition and Use Thereof
#20POLYURETHANE AQUEOUS DISPERSION, ADHESIVE, SYNTHETIC LEATHER AND PAINT
#21MOISTURE-CURING WINDSCREEN ADHESIVE BASED ON POLYURETHANE
#22MOISTURE CURABLE POLYURETHANE HOT-MELT ADHESIVE HAVING IMPROVED HEAT STABILITY
#23TWO-PACK TYPE CURABLE ADHESIVE COMPOSITION
#24ADHESIVE COATING COMPOSITION FOR ELECTRICAL STEEL SHEET, ELECTRICAL STEEL SHEET LAMINATE, AND METHOD FOR MANUFACTURING ELECTRICAL STEEL SHEET PRODUCT
#25POLYURETHANE-BASED COMPOSITION
#26PHENOL-BASED HOT MELT ADHESIVES FOR REWORK, REPAIR AND RECYCLE
#27ADHESIVE FOR DIGITAL INK PRINTED LAMINATES
#28TWO-COMPONENT POLYURETHANE ADHESIVE
#29ONE-COMPONENT MOISTURE CURING COMPOSITION
#30PASTE CIRCUIT AND WEARABLE DEVICE
#31METHOD FOR PREPARING A POLYURETHANE POLYMER
#32Solvent-Based Polyurethane Adhesive Composition for Bonding Flexible Packaging Material
#33ADHESIVE, LAMINATE, METHOD FOR PRODUCING LAMINATE, AND PACKAGING MATERIAL
#34PREPARATION METHOD FOR VENEER MANUFACTURED BOARD
#35ADHESIVE COMPOSITION
#36HIGH GREEN STRENGTH REACTIVE HOT MELT ADHESIVES
#37POLYPROPYLENE BONDING ADHESIVE AND PROCESS
#38MOISTURE CURABLE POLYURETHANE HOT-MELT ADHESIVE HAVING IMPROVED HEAT STABILITY
#39POLYURETHANE PHASE-CHANGE NANOCAPSULE, PHASE-CHANGE POLYURETHANE POURING SEALANT AND PREPARATION METHOD THEREFOR
#40Two-Component Polyurethane Dispersion Adhesives
#41One-Component Moisture-Curable Adhesive Compsition
#42ADHESIVE COATING COMPOSITION FOR ELECTRICAL STEEL SHEET, ELECTRICAL STEEL SHEET LAMINATE AND MANUFACTURING METHOD THEREFOR
#43LIQUID MOISTURE CURABLE POLYURETHANE WITH IMPROVED ADHESION TO ALUMINUM
#44ONE-COMPONENT POLYURETHANE ADHESIVE COMPOSITION
#45URETHANE RESIN-FORMING COMPOSITION, ADHESIVE AGENT, CURED PRODUCT, AND PRODUCTION METHOD FOR CURED PRODUCT
#46POLYURETHANE POLYMERS COMPRISING POLYSACCHARIDES
#47ELECTRICAL STEEL SHEET AND LAMINATE THEREOF
#48One-component moisture-curable adhesive composition
#49TWO-COMPONENT POLYURETHANE ADHESIVE COMPOSITION
#50POLYMERIZATION OF A SILANE-MODIFIED POLYMER, WHICH IS PRODUCED BY MEANS OF A RADICAL CHAIN POLYMERIZATION, IN A POLYOL OR IN A PREPOLYMER WITH TERMINAL ISOCYANATE GROUPS, AND USE THEREOF IN POLYURETHANE FORMULATIONS
#51ADHESIVE FOR COLLECTING HUMAN BODY SAMPLE FROM POROUS SURFACE
#52Moisture-Curable Polyurethane Hot Melt Adhesive Composition
#53MOISTURE RESISTANT TWO-COMPONENT ADHESIVE COMPOSITION
#542-COMPONENT TYPE URETHANE-BASED ADHESIVE COMPOSITION
#55ONE-COMPONENT POLYURETHANE ADHESIVE
#56ONE-PACK TYPE ADHESIVE AGENT COMPOSITION AND CURED PRODUCT
#57TWO-PACK TYPE ADHESIVE COMPOSITION AND CURED OBJECT
#58TWO COMPONENT (2K) CURABLE ADHESIVE COMPOSITION
#59RAPID-CURING TWO-COMPONENT COMPOSITION OF SILYLATED POLYMERS HAVING A LONG OPEN TIME
#60STRUCTURAL POLYURETHANE ADHESIVE
#61MASTIC FOR EXTREME WEATHER CONDITIONS IN TERMS OF TEMPERATURE AND HUMIDITY
#62AQUEOUS DISPERSION OF POLYURETHANE
#63STRUCTURAL POLYURETHANE ADHESIVE
#64URETHANE ADHESIVE COMPOSITION
#65ANAEROBICALLY CURABLE COMPOSITIONS
#66ADHESIVE COATING COMPOSITION FOR ELECTRICAL STEEL SHEET, ELECTRICAL STEEL SHEET LAMINATE, AND METHOD FOR MANUFACTURING SAME
#67ONE-COMPONENT SPRAY FOAM COMPOSITIONS AND DISPENSERS THEREOF
#68URETHANE-BASED ADHESIVE COMPOSITION
#69POLYURETHANE ADHESIVE COMPOSITION AND METHOD FOR PREPARING SAME
#70BLOCKED POLYURETHANE TOUGHENERS FOR EPOXY ADHESIVES
#71DE-BONDABLE POLYURETHANE ADHESIVES BASED ON THERMALLY EXPANDABLE MICROSPHERES
#72SEMI-CRYSTALLINE TWO-PART POLYURETHANE ADHESIVES FROM AMORPHOUS COMPONENTS
#73Two-component polyurethane foam adhesive, a process for preparing the same and an article made therefrom
#74LOW FREE POLYURETHANE PREPOLYMER COMPOSITION FOR REACTIVE HOT MELT ADHESIVES
#75Adhesive for processing a microelectronic substrate, and related methods
#76Thermally Stable Filled Polyurethane Reactive Hot Melt
#77A THERMOPLASTIC COMPOSITION HAVING IMPROVED MECHANICAL PROPERTIES
#78AQUEOUS DISPERSION LIQUID, ADHESIVE AGENT COMPOSITION, ADHESIVE AGENT, AFFIXING MATERIAL, AND ADHESIVE TAPE
#79Grain-finished leather-like sheet
#80Adhesive composition
#81OIL RESISTANT ADHESIVE COMPOSITION
#82MOISTURE-CURING POLYURETHANE COMPOSITION
#83CYCLOALIPHATIC ALDIMINE MIXTURE
#84POLYURETHANE COMPOSITION
#85POLYOL COMPOUNDS AND ADHESIVE COMPOSITIONS PREPARED WITH THE SAME
#86LIQUID MOISTURE CURABLE POLYURETHANE WITH IMPROVED ADHESION TO ALUMINUM
#87Polyurethane Elastic Fiber, Winding Body Therefor, Gather Member and Hygienic Material
#88COMPOUND FOR OPTICAL MATERIALS, CURABLE COMPOSITION, CURED BODY, AND OPTICAL ARTICLE
#89Urethane Adhesive Composition
#90SOLVENTLESS ADHESIVE COMPOSITION
#91ALKYLENE-OXIDE-ADDED POLYOL COMPOSITION, POLYURETHANE USING SAME, AND HOT-MELT ADHESIVE COMPRISING SAME
#92Adhesive tape
#93ISOCYANATE-TERMINATED PREPOLYMERS BASED ON POLYOXYMETHYLENE-POLYOXYALKYLENE BLOCK COPOLYMERS, PROCESS FOR THE PREPARATION AND USE THEREOF
#94HEAT-CROSSLINKABLE ADHESIVE COMPOSITION FORMING A HEAT-STABLE ADHESIVE SEAL
#95Two-part urethane adhesive composition
#96POLYOL COMPOUNDS AND ADHESIVE COMPOSITIONS PREPARED WITH THE SAME
#97Process for Forming a Laminate
#98PROCESS FOR PREPARING SILYLATED IONIC COPOLYURETHANES WITH IMPROVED ELASTICITY
#99ALKOXYSILANE FUNCTIONAL POLYURETHANE-UREA FOR ADHESIVE OR COATING
#100SILANE FUNCTIONALIZED ROSINS
#101SWITCHABLE ADHESIVE COMPOSITIONS
#102Composite Polyurethane Condom and Preparation Method Thereof
#103MODIFIED POLYURETHANE PREPOLYMER, TWO-COMPONENT POLYURETHANE ADHESIVE AND PREPARATION METHOD THEREOF
#104HIGH-TEMPERATURE CROSS-LINKING DISPERSION
#105Polyurethane adhesive composition for carbon emission reduction and method of preparing same
#106SILANE GROUP-CONTAINING BRANCHED POLYMER
#107STRUCTURAL POLYURETHANE ADHESIVE
#108ALDIMINES AND USES THEREOF
#109LINEAR ISOCYANATE GROUP-CONTAINING POLYMER
#110POLYURETHANE-BASED UV-CURABLE COMPOSITION, ADHESIVE FILM COMPRISING THE SAME, ADHESIVE TAPE AND BONDED MEMBER
#111Polyol compositions and methods
#112ASSEMBLY OF METAL PIPES WITH TWO-COMPONENT POLYURETHANE ADHESIVE
#113Urethane-Based Adhesive Composition
#114A POLYURETHANE COMPOSITION HAVING LOW TOTAL VOC CONTENT CAPABLE OF RAPID CURING WITH NO NEED OF PRIMER
#115LOW-TEMPERATURE CURABLE COMPOSITION
#116MOISTURE-CURABLE POLYURETHANE HOTMELT ADHESIVE HAVING HIGH INITIAL STRENGTH
#117Two-Part Compositions Including a Uretdione-Containing Material and Inorganic Filler, Products, and Methods
#118LAMINATE AND SKIN MATERIAL FOR VEHICLE INTERIOR MEMBER
#119IONIC SILYLATED COPOLYURETHANE AND MASTIC COMPOSITION COMPRISING SAME
#120Polyurethane based switchable adhesives
#121HIGH CREEP RECOVERY, LOW MODULUS POLYMER SYSTEMS AND METHODS OF MAKING THEM
#122Retort adhesive composition
#123STRUCTURAL POLYURETHANE ADHESIVE
#124RETORT ADHESIVE COMPOSITION
#125LOW FREE POLYURETHANE PREPOLYMER COMPOSITION
#126Polyurethane Hot Melt Adhesive Composition, and Preparation Method Thereof
#127Thermally Conductive Polyurethane Adhesive Composition
#128Two-component curing adhesive, laminated film, laminated film-manufacturing apparatus, and method for manufacturing laminated film
#129Water-emulsifiable isocyanates with improved properties
#130METHOD FOR REDUCING COEFFICIENT OF FRICTION OF A LAMINATE COMPRISING A POLYURETHANE ADHESIVE
#131Polyurethane hot melt adhesive for low temperature application
#132ACCELERATE CURE POLYURETHANE ADHESIVE COMPOSITION
#133Adhesive Selection Method, Adhesion Complex, and Production Method for Adhesion Complex
#134COMPOSITIONS AND ADHESIVE ARTICLES INCLUDING POROUS POLYMERIC PARTICLES AND METHODS OF COATING SUBSTRATES
#135Solventless adhesive composition and method for preparing the same
#136CURABLE COATING COMPOSITIONS
#137TWO-COMPONENT ADHESIVE COMPOSITIONS, ARTICLES PREPARED WITH SAME AND PREPARATION METHODS THEREOF
#138Two-Component Solvent-Based Adhesive Composition
#139Moisture curable adhesive compositions
#140Polyetherpolyol with Low Content of Cyclic Oligomers
#141ADHESIVE AND FLEXIBLE DISPLAY USING THE SAME
#142THERMALLY BONDABLE ADHESIVE TAPE BACKING
#143FILM COATING METHOD USING ENGRAVING ROLLER SYSTEM
#144Adhesive composition
#145Two-pack curable urethane adhesive
#146Two-part curable adhesive composition
#147Two-component solvent-less adhesive composition
#148LAMINATES THAT CONSIST OF METAL AND A POLYMER INTERMEDIATE LAYER MADE OF THERMOPLASTIC POLYURETHANE
#149Adhesive, laminated film using thereof and polyol composition for adhesive
#150Two-part curable adhesive composition
#151Adhesive compositions with polyesters comprising 2,2,4,4-tetraalkyl-1,3-cyclobutanediol and methods of making the same
#152Urethane-based adhesive for automobile
#153TWO-COMPONENT ADHESIVE
#154Adhesive compositions with polyesters comprising 2,2,4,4-tetraalkyl-1,3-cyclobutanediol
#155Solventless adhesive composition and process for making and use in forming a laminate
#156Process for forming a laminate
#157POLYOL COMPOSITIONS AND METHODS
#158POLYURETHANE OR POLYURETHANE-UREA COMPOSITIONS WITH REDUCED COLD HARDENING
#159Liquid-state reactive polyurethane adhesive
#160CURABLE RESIN COMPOSITION
#161BLOCKED POLYURETHANE TOUGHENERS FOR EPOXY ADHESIVES
#162Urethane prepolymer, adhesive, skin patch material, adhesive tape, wearable device, and wearable device kit
#163Two-part curable urethane adhesive composition
#164Process for the production of hot melt adhesives having a low emission of monomeric isocyanates
#165Two-pack curable adhesive composition
#166POLYOL COMPOSITIONS FOR HOT MELT ADHESIVES
#167Two-component polyurethane adhesive composition and bonding method thereof
#168ADHESIVE COMPOSITIONS INCLUDING 1,4-CYCLOHEXANEDIMETHANOL AND METHODS OF MAKING THE SAME
#169A FOAM COMPOSITION AND A FOAM COMPOSITE MADE THEREFROM
#170Polymeric material including a uretdione-containing material and an epoxy component, two-part compositions, and methods
#171Drying agent for moisture-curing compositions
#172DRYING AGENT FOR MOISTURE-CURING COMPOSITIONS
#173Isocyanate-group-containing polymer having a low content of monomeric diisocyanates
#174Two-component solventless adhesive compositions and methods of making same
#175Adhesive composition
#176Adhesive composition
#177Adhesive composition
#178Polyurethane Adhesive Having High Chemical Resistance
#179IMPROVED REACTIVE POLYURETHANE SYSTEMS
#180Two-part urethane adhesive composition
#181Two-component adhesive compositions based on isocyanate-terminated silanes, and methods for making same
#182Adhesive printing form attachment layer, method for its manufacture, and printing form attachment cylinder comprising the same
#183Primerless polyurethane adhesive compositions
#184COMPOSITIONS CONTAINING ISOCYANATE FUNCTIONAL PREPOLYMERS AND QUATERNARY AMMONUM MODIFIED NANOCLAYS
#185METHOD FOR FORMING A LAMINATE COMPRISING A TWO-COMPONENT SOLVENTLESS ADHESIVE COMPOSITION INCLUDING AN AMINE-INITIATED POLYL
#186ADHESIVE BOND BETWEEN A THERMOPLASTIC MATERIAL AND AN ELASTOMER COMPOSITION
#187Moisture curable polyurethane adhesive composition
#188Solvent-based primer having a long open time and improved adhesion
#189Bio-based reactive polyurethane hotmelt adhesives
#190Method for manufacturing flexible packaging film
#191Lignin-containing polyurethanes
#192WATER-BASED COMPOSITION WITH CHEMICAL CROSS-LINKING
#193Polyurethane hot-melt adhesive, laminated body using same, and method for producing laminated body
#194Compositions containing hydrophobic modified isocyanate functional prepolymer containing adhesives
#195POLYPROPYLENE BONDING ADHESIVE AND PROCESS
#196Polyurethane-based composition
#197Immobilizing flexible stowage containers
#198POLYURETHANE-BASED ADHESIVE COMPOSITION FOR CONCRETE REINFORCEMENT, AND CONCRETE STRUCTURAL BODY
#199AROMATIC POLYISOCYANATES WITH A HIGH SOLIDS CONTENT
#200POLYURETHANE ADHESIVE COMPOSITIONS
#201ADHESIVE USEFUL FOR INSTALLING VEHICLE WINDOWS
#202Polyurethane adhesive and mixture used for manufacturing plastic athletic track
#203Composite Elements of Thermal Insulation Material, Adhesive and Outer Layer
#204Structural Two-Component Adhesive
#205Adhesive composition
#206TWO-COMPONENT POLYURETHANE ADHESIVE COMPOSITIONS
#207Improved assembly method in making shoe, and applied correction solution
#208ADHESIVE AND SYNTHETIC LEATHER
#209TWO-COMPONENT SOLVENTLESS ADHESIVE COMPOSITIONS FOR ADHESION TO METAL AND/OR METALLIZED SUBSTRATES
#210ADHESIVE, LAMINATED FILM, AND PRODUCTION METHOD FOR LAMINATED FILM
#211ADHESIVE COMPOSITION
#212MOISTURE-CURABLE POLYURETHANE HOT-MELT ADHESIVE AND PRODUCTION METHOD THEREFOR
#213Moisture curable polyurethane hot melt adhesive composition having low levels of diisocyanate monomer
#214Hot-melt pressure-sensitive adhesive composition based on polyurethane/(meth)acrylic
#215Latent two-part polyurethane adhesives
#216Adhesive and its preparation and application
#217Production of PU foams
#218METHOD FOR PRODUCING POLYURETHANE SANDWICH MOLDED PARTS
#219Compositions based on silane-terminated polymers with improved adhesion on thermoplastics
#220Adhesive based on a special polyurethaneurea with adjustable bonding force, and production and use thereof
#221POLYURETHANE WITH (5-ALKYL -1,3-DIOXOLEN-2-ONE-4-YL) END GROUPS
#222Isocyanate functional adhesive which bonds primerless to silanated acrylic polyol based coatings
#223Adhesive useful for installing vehicle windows
#224Two-component polyurethane adhesive for lamination
#225Thermally Conductive Polyurethane Adhesive with Exceptional Combination of Mechanical Properties
#226Development of graphene composite conductive ink formulation technology
#227Silane-terminated polyurethane crosslinking polymer for high tensile strength adhesive
#228Laminate and skin material for vehicle interior member
#229Method for producing a composition comprising a polyurethane with NCO end groups
#230Physical property improvement of polyurethanes
#231Method of preparing polyurethane hot melt adhesive with high temperature resistance
#232Silane modified polymers and use of the same in adhesive compositions
#233Structural adhesive composition having high elongation and impact resistance
#234Polyurethane adhesive layers for electro-optic assemblies
#235Solvent based adhesive compositions
#236A TWO-COMPONENT POLYURETHANE ADHESIVE
#237Molding method for producing a stator for a screw drilling tool using elastomer material
#238High strength long open time polyurethane reactive hot melt
#239Polymeric material including a uretdione-containing material, two-part compositions, and methods
#240Waterborne polyurethane and preparation method thereof
#241Aqueous polyurethane dispersion adhesive compositions
#242Two-component polyurethane sealant for application at low temperature
#243High-solids content solvent-based adhesive compositions and methods of making same
#244RESIN AND HOT MELT ADHESIVE
#245TWO-COMPONENT SOLVENTLESS ADHESIVE COMPOSITIONS
#246Moisture curable hot melt sealant composition
#247Two-component solventless adhesive compositions
#248Latent curing agent and curable polyurethane composition
#249THREE-COMPONENT POLYURETHANE ADHESIVE COMPOSITIONS
#250CHEMICAL RESISTANCE IN POLYURETHANE DISPERSIONS BY NEUTRALIZATION WITH AMINE
#251ADHESIVE LAYER-EQUIPPED TRANSPARENT SURFACE MATERIAL, DISPLAY DEVICE AND PROCESSES FOR THEIR PRODUCTION
#252Adhesive for processing a microelectronic substrate, and related methods
#253Silane modified polymers with improved characteristics for adhesive compositions
#254Polyurethane adhesive with chemical resistant
#255Reactive hot-melt adhesive
#256Flame-retardant phosphorus-functional polyether carbonate polyol and method for production thereof
#257High modulus urethane adhesive compositions, manufacture and use thereof
#258Thermally activatable latently reactive adhesive film
#259MULTI-COMPONENT ADHESIVE SYSTEM
#260Contact adhesive product based on polyurethane resin, production thereof, and corresponding contact adhesive
#261Glass bonding adhesive with reduced slippage
#262Cross-linkable silylated polymer-based adhesive compositions
#263TWO COMPONENT POLYURETHANE COMPOSITION
#264Polyurethane or polyurethane-urea aqueous dispersion, preparation method therefor, and use thereof
#265REACTIVE POLYURETHANE HOT-MELT ADHESIVES
#266Two-component polyurethane adhesive
#267Accelerate cure of moisture curable polyurethane adhesive compositions useful for bonding glass
#268Non-hot-melt MDI-based polyurethane composition bearing NCO end groups and having a low content of MDI monomer, comprising at least one isocyanate compound of particular molar volume
#269Adhesive dual-component composition based on polyurethane
#270Adhesive, laminated film using thereof and polyol composition for adhesive
#271One-part moisture-curable polyurethane composition
#272Polyester-free laminating adhesive composition
#273Low-Viscosity, Rapid Curing Laminating Adhesive Composition
#274Reactive hot melt adhesive composition
#275Self-adhesive composition for the bonding of substrates with low surface energy
#276Two-component adhesive compositions and methods of making same
#277Catalyst for curable compositions containing hexahydrotriazine structural units
#278Pressure sensitive adhesive sheet, method for manufacturing thereof, and pressure sensitive adhesive film
#279Pressure sensitive adhesive, curable pressure sensitive adhesive composition, pressure sensitive adhesive sheet and method for manufacturing thereof
#280Acrylic resin powder and resin composition for hot melt adhesives, and method of producing same
#281POLYURETHANE POLYMERS COMPRISING POLYSACCHARIDES
#282REACTIVE POLYURETHANE PLASTICIZERS AND ADHESIVES MADE THEREFROM
#283POLYURETHANE MATERIAL WITH A HIGH TEMPERATURE RESISTANCE
#284Photoresponsive polyurethanes
#285Method for forming a laminate comprising a two-component solventless adhesive composition including an amine-initiated polyl
#286Method for preparing a hydrophobically modified clay
#287High-solids content solvent-based adhesive compositions and methods of making same
#288Adhesive and flexible display using the same
#289Two-component solventless adhesive compositions and methods of making same
#290Two-component solventless adhesive compositions and methods of making same
#291High efficiency laminating adhesive formulations with improved reactivity profile
#292Polyurethane adhesive layers for electro-optic assemblies
#293Single-component thermosetting epoxy resin with improved adhesion
#294Moisture curable hot melt urethane composition, method for producing cured foam of same, synthetic leather and method for producing synthetic leather
#295Curable composition
#296Two-component type urethane-based adhesive composition for an automobile
#297One-component epoxy-modified polyurethane and/or polyurea adhesives having high elongation and excellent thermal stability, and assembly processes using same
#298Adhesive viscoelastomer and its use in stabilized storage containers
#299WATER-DISPERSIBLE POLYISOCYANATES
#300Polyurethane curable composition containing polymer fine particles excellent in mechanical strength