Abstract: A photo-curable composition including (A) a cationic polymerizable compound, (B) a sensitizing colorant represented by the following formula (I), and (C) an onium salt; an ink composition containing the photo-curable composition; an inkjet recording method using the ink composition are provided, and in formula (I), X represents O, S or NR, R represents a hydrogen atom, an alkyl group, or an acyl group, n represents 0 or 1, each of R1 to R8 independently represents a hydrogen atom, or a monovalent substituent.

Abstract: The present invention relates to an aminimide compound having a structure represented by the following general formula (I) in the molecule thereof, relates to a curable composition using the aminimide compound and relates to a method for curing the composition; in which R0 represents a hydrogen atom, an alkyl group which may have an optional substituent, an aryl group which may have an optional substituent, or a heterocyclic residue which may have an optional substituent. R1, R2 and R3 each independently represent a hydrogen atom, or an optional substituent. However, at least two of R1, R2 and R3 may bond to each other to form a cyclic structure.

Abstract: The disclose provides pressure-sensitive adhesives and adhesive sealants prepared from modified, crosslinked isobutylene copolymers, and tape articles prepared therefrom.

Abstract: A photocurable composition is provided that includes a polymerizable compound, a photopolymerization initiator that is an acylphosphine oxide and/or an alpha-aminoacetophenone, a compound represented by Formula (I) below, and an amine compound. There are also provided a photocurable ink, a process for producing a photocured material, and an inkjet recording method.

Abstract: The present invention is related to novel photoinitiators, in particular to photoinitiators comprising amino groups within the molecule.

Abstract: A radiation curable composition comprising a curable compound, a photo-initiator and a co-initiator, characterized in that said co-initiator is a oligomer or polymer having a repeating unit, said repeating unit comprising at least two tertiary amines, and said polymer being prepared by the polycondensation of di- or oligofunctional Michael acceptors with mono- or oligofunctional aliphatic primary amines or with di- or oligofunctional aliphatic secondary amines or with a mixture thereof.

Abstract: The invention provides a polymerizable composition including an oxime ester photopolymerization initiator, an organic acid anhydride having a molecular weight of 300 or less, and a polymerizable compound.

Abstract: The present invention relates to a photo-curable and thermo-curable resin composition and a dry film solder resist make it possible to provide the dry film solder resist having superior heat-resistance and dimensional stability while exhibiting more improved alkali developing property. The resin composition may comprises an acid-modified oligomer having carboxyl group (—COOH) and photo-curable functional group; a photo-polymerizable monomer comprising a compound having a structure of that 3- or more functional epoxy acrylate groups are bonded to a heterocyclic structure containing nitrogen, and a functional group having carboxyl group is bonded to at least one epoxy acrylate group; a thermo-curable binder having thermo-curable functional group; and a photo-initiator.

Abstract: An alkali development-type solder resist includes (A) a carboxyl group-containing photosensitive resin obtained by reacting (a) a compound having two or more cyclic ether or thioether groups in the molecule with (b) an unsaturated monocarboxylic acid, reacting the product with (c) a polybasic acid anhydride, reacting the resulting resin with (d) a compound having a cyclic ether group and an ethylenic unsaturated group in the molecule, and reacting the product additionally with (c) a polybasic acid anhydride, (B) an oxime ester-based photopolymerization initiator containing a specific oxime ester group, (C) a compound having two or more ethylenic unsaturated groups in the molecule, and (D) a thermosetting component, wherein the dry film obtained by applying the composition has an absorbance of 0.3 to 1.2 per 25 ?m of the film thickness at a wavelength of 350 to 375 nm.

Abstract: Curable, phase-change compositions and inks used for printing three-dimensional objects including a curable monomer, a photoinitiator, a wax and a gellant, where the composition of the cured formulation has a room temperature modulus of from about 0.01 to about 5 Gpa. The curable monomer includes acrylic monomer, polybutadiene adducted with maleic anhydride, aliphatic urethane acrylate, polyester acrylate, 3-acryloxypropyltrimethoxysilane, or acryloxypropyl t-structured siloxane.

Abstract: [Object] To provide a recording method by which the occurrence of bleeding and repelling in a cured layer can be suppressed during overprinting. [Solution] In a recording method, a first ink composition containing a colorant, a photopolymerizable compound, and a photopolymerization initiator is ejected from a recording head onto a recording medium; light is emitted from a light source to the first ink composition that has adhered to the recording medium with the result that the first ink composition is cured at a cure rate that is in the range from 70 to 95%; a second ink composition containing a colorant, a photopolymerizable compound, and a photopolymerization initiator is ejected from a recording head to the first ink composition that has been cured on the recording medium; and light is emitted from a light source to the second ink composition.

Abstract: An energy ray-curable inkjet ink composition comprising polymerizable compounds containing a monofunctional monomer, (A) a reactive oligomer having a rate of elongation of 130% or more and a weight average molecular weight of not less than 800 and less than 3,000 and (B) a reactive oligomer having a rate of elongation of 130% or more and a weight average molecular weight of not less than 3,000 and not more than 8,000, provided that one of the reactive oligomers (A) and (B) is not more than difunctional and the other is not less than difunctional, at least one polymerization initiator selected from the group consisting of (C) an acylphosphine oxide initiator and (D) an ?-aminoalkylphenone initiator, a surface tension modifier, and a colorant.

Abstract: A polymerizable Norrish Type II photoinitiators includes an optionally substituted benzophenone group or an optionally substituted thioxanthone group exhibiting improved compatibility with and solubility in radiation curable compositions. Radiation curable compositions and inkjet inks can contain these polymerizable Norrish Type II photoinitiators, exhibiting low extractable amounts of the photoinitiators and their residues after curing.

Abstract: A polymerizable Norrish Type II photoinitiator according to Formula (I): . Radiation curable compositions and inkjet inks containing the polymerizable Norrish Type II photoinitiator of Formula (I) exhibit improved compatibility with and solubility in radiation curable compositions and inkjet inks, and exhibit low extractable amounts of the photoinitiator and its residues after curing.

Abstract: Disclosed is a sealant composition for a liquid crystal display device, the sealant composition including a (meta) acrylate compound as expressed in Chemical Formula 1 below

Abstract: A multifunctional Type II photoinitiator according to Formula (I): wherein X represents a structural moiety according to Formula (II): wherein: A represents a Norrish Type II initiating group; and L represents a divalent linking group positioning the Norrish Type II initiating group A and the CR2R3-group in a 1-5 to a 1-9 position wherein position 1 is defined as the first atom in the aromatic or alicyclic ring of A to which L is covalently bonded and the position 5 to 9 is defined as the carbon atom of the CR2R3-group to which L is covalently bonded, with the proviso that L does not contain an amine. Radiation curable compositions and inks include the multifunctional Type II photoinitiator.

Abstract: A curable composition for imprints excellent in adhesiveness to a substrate is disclosed. The composition comprises an oxime ester compound (A) and a polymerizable monomer (B), and the content of the polymerizable monomer (B) falls within a range of 80% by mass or more, relative to all ingredients of the composition except for a solvent.

Abstract: Stable, highly filled cationic dental compositions useful for the production of dental prostheses and dental restoration materials contain: (1) at least one compound which is reactive cationically when activated, advantageously at least one UV- and cationically reactive oxirane-functionalized silicone; (2) at least one dental filler, advantageously SiO2; (3) at least one organic polymer or copolymer dispersant having an amine index less than or equal to 100 mg of potassium hydroxide per gram of dispersant, advantageously a polyurethane/acrylate copolymer or alkylammonium salt thereof; (4) at least one cationic photoinitiator, advantageously iodonium borate; and (5) optionally, at least one photosensitizer.

Abstract: Dental compositions are described which are photocurable by radiation with a wavelength greater than 390 nm. The compositions include a cationically active compound, a dental filler, optionally a dispersant, a cationic photoinitiator and a photosensitizer which is a thioxanthone salt substituted by at least one group containing an ammonium function. The composition has the advantage of remedying the color stability problems of finished dental products after crosslinking.

Abstract: An object of the present invention is to provide a sulfonium salt that has sufficient photosensitivity by active energy rays, such as visible light, ultraviolet rays, electron beams, and X-rays. The present invention is a sulfonium salt represented by formula (1). It is noted that R1 is a group represented by formula (2); R2 and R3 each represent an aryl group having 6 to 30 carbon atoms, a heterocyclic hydrocarbon group having 4 to 30 carbon atoms, an alkyl group having 1 to 30 carbon atoms, an alkenyl group having 2 to 30 carbon atoms, or an alkynyl group having 2 to 30 carbon atoms; X? represents a monovalent polyatomic anion; R4 to R6 each represent an alkyl group, or the like; k represents an integer of 0 to 4; m represents an integer of 0 to 3; n represents an integer of 0 to 4; and A represents a group represented by —S—, —O—, —SO—, —SO2—, or —CO—.

Abstract: The present invention relates to pressure-sensitive adhesive compositions which contain (A) hydroxyl group and alkylene oxide group containing acrylic copolymer and (B) a multifunctional isocyanate-based hardener, and form interpenetrating network structures when hardened, and polarizers and liquid crystal displays comprising the same. The pressure-sensitive adhesive compositions of the present invention exhibit superior durability, reliability, and workability and effectively prevent light leakage under high temperature and/or high humidity conditions. Particularly, the present invention provides pressure-sensitive adhesive compositions capable of significantly suppressing light leakage even in large size display devices, and polarizers and liquid crystal displays comprising the same.

Abstract: The invention provides an active energy ray curable liquid composition containing a compound having a bonding group represented by a general formula (I), and a liquid cartridge. ([A] in the formula (I) is a cyclic group represented by a general formula (II), [Y] in the formula (II) is a cyclic linking group having a carbonyl group and a site containing an unsaturated carbon bond adjacent to the carbonyl group, and E in the formula (I) is a bonding group having at least one amide bond and at least one of divalent organic groups which may be substituted.

Abstract: A floor covering includes a wear layer including a resin and a photoinitiator in which the composition of the wear layer is curable by radiation having the strongest wavelength in the UVV range of 400 to 450 nm. The gloss of the wear layer can be controlled by controlling the amount of flatting agent in the composition applied to the surface, the amount of power applied to the surface coated with the composition or the temperature of the surface coated with the composition when the coated surface is subjected to the UVV radiation.

Abstract: Provided are a salt compound, cationic polymerization initiator and cationically polymerizable composition, which have a superior acid-generating capacity and high sensitivity, and are free from coloration. The salt compound is represented by the following general Formula (1): (wherein, R01 to R05 each independently represents a group selected from a hydrogen atom, a fluorine atom and —YR group, one of the R01 to R05 being a —YR group and at least two of the R01 to R05 being fluorine atoms; Y represents an oxygen atom or a sulfur atom; R represents a C1-C4 alkyl group; Ctp+ represents a p-valent cation, the p being 1 or 2; and n represents a coefficient required for maintaining electrical neutrality).

Abstract: An oxime ester compound of formula (I) useful as a photopolymerization initiator. A photopolymerization initiator having the oxime ester compound as an active ingredient is activated through efficient absorption of light of long wavelength, e.g., 405 nm or 365 nm, to exhibit high sensitivity. In formula (I), R1 and R2 are each R11, OR11, COR11, SR11, CONR12R13, or CN; R11, R12, and R13 are each hydrogen, a C1-C20 alkyl group, C6-C30 aryl group, a C7-C30 arylalkyl group, or a C2-C20 heterocyclic group; R3 and R4 are each R11, OR11, SR11, COR11, CONR12R13, NR12COR11, OCOR11, COOR11, SCOR11, OCSR11, COSR11, CSOR11, CN, halogen, or a hydroxyl group; a and b is each 0 to 4; X is oxygen, sulfur, selenium, CR31R32, CO, NR33, or PR34; and R31, R32, R33, and R34 each have the same meaning as R1.

Abstract: Disclosed is an aqueous polyurethane dispersion obtained by dispersing in water a reaction product obtained by reacting a reaction mixture comprising at least one organic, aliphatic, cycloaliphatic or aromatic di, tri or poryisocyanate, at least one isocyanate reactive polycarbonate diol, triol or polyol, at least one compound comprising at least one isocyanate reactive group and at least one free radically polymerisable unsaturated group, and at least one compound comprising at least one isocyanate reactive group and at least one at least dispersing active group, and optionally at least one compound comprising at least two isocyanate reactive groups and having a molecular weight of less than 1000 g/mol.

Abstract: A photo-crosslinkable polyolefin composition comprises a polyolefin, a source of functionality receptive to crosslinking by UV radiation, a cationic photoinitiator and optionally includes a free-radical photoinitiator, a crosslinking accelerator or sensitizer, and other additives such as compatibilizers, inorganic fillers, nanofillers, glass, polymeric and ceramic microspheres, glass fibres, flame retardants, antioxidants, stabilizers, processing aids, foaming agents and pigments. A method for manufacturing a UV-crosslinked polyolefin article comprises forming an article by extruding, moulding or otherwise forming the UV-crosslinkable polyolefin composition and subjecting the article to UV radiation on-line with the extrusion, moulding or other forming operation.

Abstract: Provided are a photosensitive resin and a photosensitive resin composition comprising the photosensitive resin. The photosensitive resin has the structure of Formula 1, which is described in the specification. The photosensitive resin and the photosensitive resin composition have good sensitivity, improved resistance to heat and chemicals, and excellent storage stability. Further provided are a method for preparing the photosensitive resin and a cured product of the photosensitive resin composition.

Abstract: The present invention relates to a photosensitive resin composition for a color filter and a color filter fabricated using the same. The photosensitive resin composition includes (a) an acrylic-based resin, (b) a photopolymerizable monomer, (c) a photopolymerization initiator, (d) a pigment, and (e) a solvent. The acrylic-based resin is a copolymer including a repeating unit of an ethylenic unsaturated monomer including a carboxyl group and a repeating unit of an ethylenic unsaturated monomer including an alkoxy 4-oxo butanoic acid group. The photosensitive resin composition for a color filter can have residue removing characteristics, and is capable of forming fine pixels and providing a color filter having high resolution.

Abstract: Stable and substantially filled cationic dental compositions are described which include: (1) at least one cationically reactive compound (A); (2) at least one dental filler (B); (3) optionally, at least one dispersant (C) composed of at least one organic polymer or copolymer; (4) at least one cationic photoinitiator (D); and (5) optionally, at least one photosensitizer (E). The dental filler (B) is treated with at least one organosilicon coupling agent (F), and at least one compound (G). The organosilicon coupling agent (F) has at least one reactive function (rfA) directly linked to a silicon atom forming after activation of a chemical bond with the dental filler, and at least one reactive function (rfB) not directly linked to a silicon atom, forming after activation, a chemical bond with a reactive function (rfC) of the compound (G).

Abstract: Benzophenone/thioxanthone derivatives useful as photoinitiators are provided as well as photopolymerizable compositions comprising the benzophenone/thioxanthone derivatives.

Abstract: A photoinitiator compound is functionalized with alkoxy groups so as to be soluble in alkoxy-containing monomers. The photoinitiator has a formula of R1—(OR2)n—OC(?O)—R3, wherein R1—(OR2)n— represents an alkoxy group and R3 represents a photoinitiator structure. The photoinitiator may be used in a composition for incorporation into inks.

Abstract: A method for forming a grating in a photorefractive composition comprising the steps of: providing a photorefractive composition containing a sensitizer and a polymer, wherein the polymer includes a first repeating unit which includes a moiety selected from the group consisting of the formulae (Ia), (Ib) and (Ic) as defined herein; and irradiating the photorefractive composition with a near infrared (NIR) laser, wherein the composition provides long grating holding time and the grating signal can be read out without external bias voltage.

Abstract: Superabsorbent polymer particles having improved surface cross-linking and their use in absorbent articles. The superabsorbent polymer particles comprise a water-absorbing resin and the reaction product of a radiation activatable surface cross-linker. The reaction product of the radiation activatable surface cross-linker is present at the surface of the superabsorbent polymer particle. The radiation activatable surface cross-linker includes at least two radiation activatable groups R, which are covalently bound to each other or to at least one spacer group S.

Abstract: The present invention concerns photopolymerisable systems comprising reactive oligomers and/or monomers having ethylenically unsaturated groups and as photoinitiator at least one hydroxamic ester of Formula (I) or (II) or (III).

Abstract: A radiation-curable composition useful for the production of three-dimensional solid articles is provided. The radiation-curable composition comprises at least one hyperbranched poly(meth)acrylate compound, at least one light sensitizer, and at least one free radical polymerization initiator.

Abstract: An actinic-radiation curable ink composition includes a colorant, a dendritic polymer serving as a polymerizable compound, and a thioxanthone photoinitiator having a plurality of functional groups. The proportion of the thioxanthone photoinitiator is in the range of 3% to 27% by mass with respect to the total mass of the dendritic polymer.

Abstract: Radiation curable compositions, such as UV curable ink compositions, contain a polymeric dispersant, a curable material, and a nanoscale pigment particle composition including an organic monoazo laked pigment including at least one functional moiety, and a sterically bulky stabilizer compound including at least one functional group, wherein the functional moiety of the pigment associates non-covalently with the functional group of the stabilizer; and the presence of the associated stabilizer limits the extent of particle growth and aggregation, to afford nanoscale-sized pigment particles.

Abstract: The present invention involves the design of a radiation curable organic pre polymer resin material based on urethane acrylic linkage synthesized from the natural renewable resource cardanol or a derivative thereof, for coating application. These new molecules have a faster and better curing rate compared to the starting renewable resource—cardanol. This is brought about by the hydrogen bonding of the urethane linkage which leads to a pre organization of the molecules in such a way as to bring the cross linkable double bonds closer to each other. The present invention also involves a UV curable formulation of the above mentioned resins along with 2-10 parts by weight of a photopolymerization initiator. The resin, either in a formulation or alone turns into a cross linked film upon photopolymerization in presence of photoinitiator under a UV curable radiation source like a mercury vapor pressure lamp.

Abstract: The present invention pertains to a composition comprising (a) a photolatent base; (b) a blocked isocyanate or blocked isothiocyanate and (c) a hydrogen donor compound; and its applications.

Abstract: Curable compositions based on polyuretidiones, polythiols and photoactivable bases are disclosed. Also a process for generating isocyanate groups by exposing uretidiones to radiation in the range of 100-315 nm is disclosed. The process can be used in a dual curing system for curing compositions that comprise groups that under go photoinduced polymerizations and active hydrogen groups that react with the generated isocyanates.

Abstract: The invention pertains to a photosensitive resin composition, comprising: (A) an alkaline soluble resin; (B) a multi-functional monomer; (C) a photoinitiator; (D) a colorant; and (E) a solvent, wherein said alkaline soluble resin comprises a copolymer obtained from the copolymerization of 5-95 wt % of the monomer of formula (1): and 5-95 wt % of an ethylenically unsaturated monomer containing at least one carboxy group. The inventive photosensitive resin composition possesses good heat resistance, development properties, and adhesion properties and can be used in liquid crystal displays as a photosensitive material for the manufacture of color filters.

Abstract: Compounds of formula (I): [where: R1 is a direct bond, oxygen, a group >CH2, sulphur, a group >C?O, a group —(CH2)2— or a group —N—Ra, where Ra is hydrogen or alkyl; R3, R4, R5 and R6 are hydrogen or substituents ?; R8, R9, R10 and R11 are hydrogen, hydroxy or alkyl; or R9 and R11 are joined to form a fused ring system with the benzene rings to which they are attached; R7 is a direct bond, oxygen or a —CH2— group; p is 0 or 1; substituents ? are: alkyl, alkoxy, alkenyl, halogen, nitrile, hydroxyl, aryl, aralkyl, aryloxy, aralkyloxy, arylalkenyl, cycloalkyl, carboxy, carboxyalkoxy, alkoxycarbonyl, aryloxycarbonyl, alkylcarbonyloxy, alkanesulphonyl, arenesulphonyl, alkanoyl or arylcarbonyl; n is 1 to 12; R12 is hydrogen, methyl or ethyl; A is a group —[O(CHR13CHR14)a]y—, —[O(CH2)bCO]y—, or —[O(CH2)bCO](y?1)—[O(CHR13CHR14)a]—, where: one of R13 and R14 is hydrogen and the other is hydrogen, methyl or ethyl; a is 1 to 2; b is 4 to 5; Q is a residue of a polyhydroxy compound having from 2 to 6 hydroxy gr

Abstract: A material which comprises a polyrotaxane and a polymer and is crosslinked by irradiation with light. In the material, which comprises a first polyrotaxane and a polymer, the first polyrotaxane comprises a first cyclic molecules, a first linear molecule with which the first cyclic molecules are clathrated in a splitted state, and first blocking groups disposed respectively at both ends of the first linear molecule so as to prevent the first cyclic molecules from being released from the first linear molecule. The first polyrotaxane combines with at least part of the polymer through the first cyclic molecules by photocrosslinking reaction.

Abstract: A photocurable composition is provided that includes a polymerizable compound, a photopolymerization initiator, a compound represented by Formula (I) below, and an amine compound, the photopolymerization initiator comprising an acylphosphine oxide compound and/or an ?-aminoacetophenone compound in Formula (I) above, X denotes O, S, or NR, n denotes 0 or 1, R denotes a hydrogen atom, an alkyl group, or an acyl group, R1, R2, R3, R4, R5, R6, R7, and R8 independently denote a hydrogen atom or a monovalent substituent, and two of R1, R2, R3, and R4 that are adjacent may be bonded to each other to form a ring.

Abstract: A liquid radiation and thermally curing composition characterized in, that said composition comprises at least one ester between at least one tri or polyalcohol and acrylic and/or methacrylic acid, which ester has at least two hydroxyl groups, at least one acrylic or methacrylic double bond, a hydroxyl value of 50-500 mg KOH/g and a double bond concentration of 1-10 mmoles/g, at least one crosslinking agent for hydroxyl functional compounds, which crosslinking agent optionally has at least one olefinic double bond, and an additive package comprising at least one photoinitiator, radical scavenger, light stabilizer, wetting agent and/or leveling agent, and optionally at least one monomeric or oligomeric reactive diluent.

Abstract: Compounds of formula (I): [where: R1 is a direct bond, oxygen, a group >CH2, sulphur, a group >C?O, a group —(CH2)2— or a group —N—Ra, where Ra is hydrogen or alkyl; R3, R4, R5 and R6 are hydrogen or substituents ?; R8, R9, R10 and R11 are hydrogen, hydroxy or alkyl; or R9 and R11 are joined to form a fused ring system with the benzene rings to which they are attached; R7 is a direct bond, oxygen or a —CH2— group; p is 0 or 1; substituents ? are: alkyl, alkoxy, alkenyl, halogen, nitrile, hydroxyl, aryl, aralkyl, aryloxy, aralkyloxy, arylalkenyl, cycloalkyl, carboxy, carboxyalkoxy, alkoxycarbonyl, aryloxycarbonyl, alkylcarbonyloxy, alkanesulphonyl, arenesulphonyl, alkanoyl or arylcarbonyl; n is 1 to 12; R12 is hydrogen, methyl or ethyl; A is a group —[O(CHR13CHR14)a]y—, —[O(CH2)bCO]y—, or —[O(CH2)bCO](y-1)—[O(CHR13CHR14)a]—, where: one of R13 and R14 is hydrogen and the other is hydrogen, methyl or ethyl; a is 1 to 2; b is 4 to 5; Q is a residue of a polyhydroxy compound having from 2 to 6 hydroxy gr

Abstract: The present invention relates to compositions for functional films, and more particularly to compositions for functional films such as a heat ray screening film compatible with hydrolic or alcoholic and anti-hydrolic resin binder, a near infrared screening film, a chrominance correcting film, a conductive film, a magnetic film, a ferromagnetic film, a dielectric film, a ferroelectric film, an electrochromic film, an electroluminescence film, an insulating film, a reflecting film, a reflection preventing film, a catalyst film, a photocatalyst film, a light selectively absorbing film, a hard film, and a heat resisting film, films formed therefrom, and a method of forming the compositions and the films.

Abstract: Stable and substantially filled cationic dental compositions are described which include: (1) at least one cationically reactive compound (A); (2) at least one dental filler (B); (3) optionally, at least one dispersant (C) composed of at least one organic polymer or copolymer; (4) at least one cationic photoinitiator (D); and (5) optionally, at least one photosensitizer (E). The dental filler (B) is treated with at least one organosilicon coupling agent (F), and at least one compound (G). The organosilicon coupling agent (F) has at least one reactive function (rfA) directly linked to a silicon atom forming after activation of a chemical bond with the dental filler, and at least one reactive function (rfB) not directly linked to a silicon atom, forming after activation, a chemical bond with a reactive function (rfC) of the compound (G).

Abstract: Superabsorbent polymer particles with improved surface cross-linking for use in absorbent articles and a process for making the superabsorbent polymer particles. The superabsorbent polymer particles include a water-absorbing resin and the reaction product of a radiation activatable surface cross-linker. The reaction product of the radiation activatable surface cross-linker is present at surfaces of the superabsorbent polymer particles. The radiation activatable surface cross-linker includes at least two radiation activatable groups R, which are covalently bound to each other or to at least one spacer group S.