Abstract: The present technology provides at least one prepolymer comprising a polyisocyanate and a ring-containing isocyanate reactive component as a load-bearing capacity improvement agent in flexible polyurethane foam manufacture. The ring-containing component eliminates and/or reduces the need for a copolymer polyol containing suspended solids in the manufacture of flexible foam products. This can reduce production costs, reactivity variations, filter plugging, color variations, foam shrinkage/tightness, foam irregularity, and foam malodor while maintaining an adequate load-bearing capacity.

Abstract: The invention concerns isocyanate compositions exhibiting good mixing properties. The compositions comprise for successive or simultaneous addition: an isocyanate sub-composition comprising by weight not more than 5% of diisocyanate monomers and monomers derived from amino acids and comprising an isocyanate function content not more than 55%; a compound selected among the compounds bearing dihydrocarbylsilylene groups bonded to a metalloid of the chalcogen column or to an atom of the nitrogen column, the content in such groups being not less than 0.1 wt. % expressed in silicon atom weight relative to the amount of monomers corresponding to units derived therefrom. The invention is applicable to the coatings industry, in particular paints and adhesives.

Abstract: This invention provides a blend which comprises (i) at least one aromatic primary diamine, with which has been blended a color-minimizing amount of at least one N,N-dmydrocarbylhydroxylamine, wherein the aromatic primary diamine is in the form of one benzene ring having two primary amino groups on the ling, which amino groups are meta or para relative to each other, and in which each position ortho to a primary amino group bears an alkyl group, and (ii) at least one aromatic secondary diamine having a Gardner color number no more than about 7, wherein said aromatic secondary diamine either is in the form of one benzene ring having two secondary amino groups on the ring, or is in the form of two benzene rings connected by an alkylene bridge and having one secondary amino group on each ring. Optionally, at least one N,N-dihydrocarbylhydroxylamine has been blended with the aromatic secondary diamine.

Abstract: The present invention relates to mixtures for preparing transparent plastics, encompassing a) a prepolymer prepared from compounds of the formula (I) and (II) ?where each R1, independently of the others, is hydrogen or a methyl radical, ?each R2, independently of the others, is a linear or branched, aliphatic or cycloaliphatic radical, or a substituted or unsubstituted aromatic or heteroaromatic radical, and each of m and n, independently of the other, is a whole number greater than or equal to 0, where m+n>0, and from compounds of the formula (III), or from alkyl dithiols or from polythiols, preferably HS—R3—SH (III) ?where R3, identical with or different from R2, can be as defined for R2, and b) at least one monomer (A) capable of free-radical polymerization and having at least 2 methacrylate groups, and c) aromatic vinyl compounds, such as styrene, and d) if appropriate, a monomer capable of free-radical polymerization and having at least two terminal olefinic groups whose reactivity differs, a

Abstract: Disclosed herein is a thermally curable mixture, comprising at least one phosphonic diester (A), at least one diphosphonic diester (A), or at least one phosphonic diester and at least one diphosphonic diester (A); and at least one compound (B) which can be reacted by transesterification, transamidation, self-condensation of N-hydroxyalkylamino groups, self-condensation of N-alkoxyalkylamino groups, transacctalization of N-alkoxyalkylamino groups, acctalization of N-hydroxyalkylamino groups, or a combination thereof. Also disclosed is a process for making the thermally curable mixture, and a cured material comprising the product of thermally curing the mixture.

Abstract: Disclosed herein is a silane-functional mixture, comprising at least one phosphonic diester (A), at least one diphosphonic diester (A), or at least one phosphonic diester and one diphosphonic diester (A), and at least one compound (B) comprising at least two condensable silane groups.

Abstract: An amine aqueous solution for forming an active layer of a polyamide reverse osmosis composite membrane is prepared, which consists of 0.1 through 20 weight % of polyfunctional aromatic amine monomer, 0.1 through 20 weight % of multi-functional tertiary alcohol amine, 0.1 through 20 weight % of strong acid, and 40 through 99.7 weight % of water.

Abstract: The invention relates to mixtures for producing transparent plastics, comprising a) a prepolymer, produced from the compounds of formulae (I) and (II), wherein R1 independently represents hydrogen or a methyl group, R2 independently represents a linear or branched, aliphatic or cycloaliphatic group or a substituted or unsubstituted aromatic or heteroaromatic group and m and n independently represent an integer greater or equal 0, with m+1>0, and compounds of formula (III), alkyldithiols or polythiols, preferably HS—R3—SH (III), wherein R3 is equal or different from R2 and can have the meaning indicated in R2, and b) at least one radically polymerizable monomer (A) having at least two methacrylate groups and c) aromatic vinyl compounds, such as styrene and d) optionally a radically polymerizable monomer having at least two terminal olefinic groups that have different reactivity, and/or e) optionally at least one monomer (B) from the group of methacrylates, preferably 2-hydroxyethylmethacrylate.

Abstract: The present invention relates to a composition comprising a mixture of wood particles and non-wood plant particles for the manufacture composite boards or the like. The present invention also relates to methods of preparing composite boards. As described herein, the composition allows the production of panels, boards or logs that can be used in the construction of buildings, houses and furniture.

Abstract: A mixture and method for the storage and delivery of at least one gas are disclosed herein. In one aspect, there is provided a mixture for the storage and delivery of at least one gas comprising: an ionic liquid comprising an anion and a cation; and at least one gas that is disposed within and is reversibly chemically reacted with the ionic liquid. In another aspect, there is provided a method for delivering at least one gas from a mixture comprising an ionic liquid and at least one gas comprising: reacting the at least one gas and the ionic liquid to provide the mixture and separating the at least one gas from the mixture wherein the at least one gas after the separating step is substantially the same as the at least one gas prior to the reacting step.

Abstract: The present invention relates to 1-alkoxy-polyalkyl-peridine derivatives containing a structural element of formula (I) G1, G2, G3, G4 are independently C1-C6alkyl with the proviso that at least one is not methyl or G1 and G2 or G3 and G4, or G1 and G2 and G3 and G4 together form a C5-C12cycloalkyl group; G5, G6 independently are H, C1-C18alkyl, phenyl, naphthyl or a group COOC1-C18alkyl and X represents a group such that the free radical X• derived from X is capable of initiating polymerization of ethylenically unsaturated monomers, with the proviso that compounds A1 and A2 are excluded Further subjects of the invention are a polymerizable composition comprising a) at least one ethylenically unsaturated monomer and b) a 1-alkoxy-polyalkyl-piperidine derivative, a process for polymerizing ethylenically unsaturated monomers, and the use of 1-alkoxy-polyalkyl-piperidine derivatives for controlled polymerization.

Abstract: Difunctional oxazoline resins, which may be produced in a convenient one-step reaction from an arylalkylene dinitrile by reaction with an amino alcohol, are used in compositions with an additional curable compound or resin containing one or more carbon to carbon double bonds. The composition can be cured to a thermoset material, the curing mechanism occurring by the zwitterion polymerization of the bisoxazoline resin with the resin containing the one or more carbon to carbon double bonds. The reaction occurs without the need for curing initiators.

Abstract: Disclosed are methods for making aldehydes and ketones comprising allowing the corresponding primary or secondary alcohol to react in the presence of trichoroisocyanuric acid, a compound of formula R1SR2 and a base. In one embodiment, the alcohol is a compound of formula (I): wherein R3 is a protecting group. Also disclosed are methods for making 3-O-protected morphine dienol carboxylates comprising allowing a compound of formula (I) to oxidize in the presence of a chlorine-containing compound and a compound of formula R1SR2; and allowing the product of the oxidation step to react with an acylating agent.

Abstract: The invention relates to amphiphilic, nanoscalar particles comprising lipophilic hydrolyzable groups on their surface. The invention also relates to methods for producing amphiphilic, nanoscalar particles and to compositions containing said particles.

Abstract: A slurry rheology modifier comprises a first water-soluble low-molecular compound [referred to hereinafter as compound (A)] and a second water-soluble low-molecular compound [referred to hereinafter as compound (B)] being different from the compound (A), wherein the viscosity of an aqueous solution at 20° C. prepared by mixing an aqueous solution SA (with a viscosity at 20° C. of 100 mPa·s or less) of compound (A) with an aqueous solution SB (with a viscosity at 20° C. of 100 mPa·s or less) of compound (B) in the ratio of 50/50 by weight can be at least twice as high as the viscosity of either aqueous solution before mixed.

Abstract: The present invention provides a novel azo compound, a curable composition comprising a colorant superior in the light-fastness and heat resistance of a dye, pattern-forming characteristics (developing characteristics) and liquid preserving characteristics, a color filter using the curable composition and a method of producing the color filter.

Abstract: A hardener composition and pine bark tannin-containing resin composition are disclosed. The resin composition is formulated to neutral pH in order to reduce the extent of self-polymerisation and provide a satisfactory shelf life. The hardener composition may be mixed with a suitable resin, or the resin composition mixed with a suitable hardener to produce a cold set adhesive which is particularly useful for bonding wood.

Abstract: One embodiment of the invention provides a method including molding composite panels that are UV resistant, substantially free of fiber readout, and have visible fibers from epoxy compositions comprising resins having aromatic rings.

Abstract: The present invention has for its object to provide an emulsion polymer resin composition adapted to give a coating film having an excellent appearance in terms of gloss, image sharpness, and apparent thickness, be satisfactory in curability and storage stability, contribute to cost reduction, express satisfactory coating film properties such as hardness, high impact resistance, scratch resistance, acid rain resistance, and weather resistance, and be conducive to a reduced VOC level, a curable composition comprising the above emulsion polymer resin composition and a crosslinking agent, and a cured coating film formed from the above curable composition. The present invention is an emulsion polymer resin composition which contains a hydroxyl group and a functional group reactive with the hydroxyl group within the same particle and has a weight average molecular weight of not less than 10000 but not more than 500000.

Abstract: The present invention relates to selected 1-alkoxy-2,2,6,6 tetramethyl piperidine, 1-alkoxy-2,2 diethyl-6,6 dimethyl piperidine and 1-alkoxy-2,6 diethyl-2,3,6 dimethyl piperidine derivatives which are substituted in the 4 position by two oxygen atoms forming an open chain or cyclic ketal structure, a polymerizable composition comprising a) at least one ethylenically unsaturated monomer and b) said piperidine derivatives. Further aspects of the present invention are a process for polymerizing ethylenically unsaturated monomers, and the use of 1-alkoxy-2,2,6,6 tetramethyl piperidine, 1-alkoxy-2,2 diethyl-6,6 dimethyl piperidine and 1-alkoxy-2,6 diethyl-2,3,6 dimethyl piperidine derivatives which are substituted in the 4 position by two oxygen atoms forming an open chain or cyclic ketal structure for controlled polymerization.

Abstract: Resorcinol-blocked isocyanate compositions are derived from the reaction between a resorcinol compound and at least two different isocyanate compounds. The resorcinol-blocked isocyanate compositions may have two or more unblocking temperatures and/or melting characteristics that may provide some unique properties, such as improved adhesion of rubber reinforcing materials to rubber materials or compounds. The resorcinol-blocked isocyanate compositions can be used in fabric dipping formulations and/or rubber compositions with improved properties.

Abstract: The present invention relates to selected 1-alkoxy-2,2 diethyl-6,6 dimethyl piperidine and 1-alkoxy-2,6 diethyl-2,3,6 trimethyl piperidine derivatives which are substituted in the 4 position by an oxygen or nitrogen atom; a polymerizable composition comprising a) at least one ethylenically unsaturated monomer and b) said piperidine derivatives. Further aspects of the present invention are a process for polymerizing ethylenically unsaturated monomers, and the use of 1-alkoxy-2,2 diethyl-6,6 dimethyl piperidine and 1-alkoxy-2,6 diethyl-2,6 dimethyl piperidine derivatives which are substituted in the 4 position by an oxygen or nitrogen atom for controlled polymerization. The intermediate N-oxyl derivatives, a composition of the N-oxyl derivatives with ethylenically unsaturated monomers and a free radical initiator, as well as a process for polymerization are also subjects of the present invention.

Abstract: An epoxy resin composition comprising an epoxy resin, a hardening agent and a hardening accelerator as an indispensable ingredients is provided wherein the hardened resin has a high translucency and has little discoloration under high temperature and high humidity and is excellent at heat resistance and light fastness by compounding a phosphonium compound represented by the following formula (I) as a hardening accelerator.

Abstract: The present invention relates to a process for the preparation of R- and S-lipoic acid and R- and S-dihydrolipoic acid comprising (a) reaction of where MS is SO2—R? and R and R? independently of one another are C1–C6-alkyl, C3–C8-cycloalkyl, C3–C8-cycloalkylalkyl, aryl or aralkyl, with sodium sulfide and sulfur in methanol. The invention especially relates to processes for preparing pure R- or S-dihydrolipoic acid, which is either used directly or processed further to give R- and S-lipoic acid. The process also serves for the production of pharmaceuticals. The present invention further relates to a solution of sodium sulfide trihydrate and sulfur in methanol, the sulfur being present in a molar excess over the sodium sulfide trihydrate, and a kit which comprises the solution according to the invention.

Abstract: A polymeric linking agent enables the manufacture of photovoltaic cells on flexible substrates, including, for example, polymeric substrates. Photovoltaic cells may be fabricated by a relatively simple continuous manufacturing process, for example, a roll-to-roll process, instead of a batch process.

Abstract: The present invention provides a process for making a viscous reaction product and making this into a solid or suspendable component, so that it can be incorporated in solid and liquid compositions such as cleaning compositions or for example fabric care compositions. The process comprises the steps of: a) reacting at least two compounds with one another to form a first active material to form a viscous mixed product which has a viscosity of at least 500 cps or even at least 1000 cps at 20° C., thereby preferably mixing this with a second active material; b) mixing the product of step a) with a liquid carrier material, (which can then be suspended in a liquid composition); or if slid components are required, step b) being followed by: c) mixing the mixture of step b) with a solid granulation agent to form a solid component; d) optionally forming the solid component of step c) into granules.

Abstract: A silane composition for preparing a semiconductor thin films of a solar cell is disclosed. The silane composition contains a polysilane compound represented by the formula SinRm (n is an integer of 3 or more, m is an integer of n to (2n+2) and an m number of R's are each independently a hydrogen atom, alkyl group, phenyl group or halogen atom, with the proviso that when all the m number of R's are hydrogen atoms and m=2n, n is an integer of 7 or more), and at least one silane compound selected from cyclopentasilane, cyclohexasilane and silylcyclopentasilane.

Abstract: Two new surfactant molecules are reported which contain thermally labile Diels-Alder adducts connecting the polar and non-polar sections of each molecule. The two surfactants possess identical non-polar dodecyl tail segments but exhibit different polar headgroups. The surfactants become soluble in water when anionic salts are formed through the deprotonation of the surfactant headgroups by the addition of potassium hydroxide. When either surfactant is exposed to temperature above about 60° C., the retro Diels-Alder reaction occurs, yielding hydrophilic and hydrophobic fragments and the aqueous solutions of the surfactants subsequently exhibit loss of all surface-active behavior.

Abstract: Volatile liquid precursors are provided for use in the formation of alkali metal-containing materials. The compound includes an alkali metal and an amide ligand and is a liquid at a temperature of less than about 70° C.

Abstract: The synthesis, processing and test of improved lead zirconate titanate (PZT) precursor materials useful for making bulk, thick films and thin films of PZT are provided. PZT is an oxide ceramic extensively used for its piezoelectric properties. A variety of devices made from piezoelectric PZT are known. A soluble spin-on precursor is provided that is compatible with and soluble in non-toxic and environmentally benign solvents (including water), has high stability and long shelf life, and provides high quality PZT films.

Abstract: In accordance with the present invention, there are provided novel thermosetting resin compositions which do not require solvent to provide a system having suitable viscosity for convenient handling. Invention compositions have the benefit of undergoing rapid cure. The resulting thermosets are stable to elevated temperatures, are highly flexible, have low moisture uptake and are consequently useful in a variety of applications, e.g., in adhesive applications since they display good adhesion to both the substrate and the device attached thereto.

Abstract: The invention relates to a redox initiator system which allows dental formulations to be cured in acidic medium by way of a free-radical polymerization and which ensures a high level of adhesion of the polymerizing composition to the hard substances of the teeth, namely enamel and, in particular, dentine. The redox initiator system comprises the following constituents: (A) from 14.9 to 50% by weight of a barbituric acid or thiobarbituric acid and/or of a barbituric or thiobarbituric acid derivative, (B) from 30 to 75% by weight of a peroxodisulfate compound and/or peroxodiphosphate compound, (C) from 10 to 35% by weight of a sulfinic acid compound, and (D) from 0.1 to 5% by weight of a copper compound.

Abstract: A polymeric linking agent enables the manufacture of photovoltaic cells on flexible substrates, including, for example, polymeric substrates. Photovoltaic cells may be fabricated by a relatively simple continuous manufacturing process, for example, a roll-to-roll process, instead of a batch process.

Abstract: A method whereby polyunsaturated components of fatty acids are conjugated and selectively polymerized in the presence of monounsaturated components, mainly oleic acid. Separation techniques are employed to isolate oleic acid and the linoleic acid-based dimer/trimer acids produced.

Abstract: In accordance with the present invention, there are provided novel thermosetting resin compositions which do not require solvent to provide a system having suitable viscosity for convenient handling. Invention compositions have the benefit of undergoing rapid cure. The resulting thermosets are stable to elevated temperatures, are highly flexible, have low moisture uptake and are consequently useful in a variety of applications, e.g., in adhesive applications since they display good adhesion to both the substrate and the device attached thereto.

Abstract: An epoxy resin hardener having a cure temperature of between about 60° C. and 100° C. comprises a mixture of: a) an imidazole or a trihydric compound having methylol groups at the 2- and 6-positions formed by reacting a 4-alkylphenol with 2 moles of formaldehyde, b) trimethylopropane, and c) tetramethylguanidine or a tetramethylguanidine derived from the reaction of a monepoxide, a diepoxide, a phenol and formaldehyde, or a dihydric phenol and formaldehyde.

Abstract: The invention relates to compositions comprising an ester of a polyol and a mixture of fatty acids, wherein at least a part (I) of the esterified fatty acids has a chain length of 5-12 carbon atoms and another part (II) of the esterified fatty acids has a chain length of 16-22 carbon atoms, and wherein the composition has a viscosity of 7000 mm 2 /s or less, when tested according to ASTM (D2531). Such compositions have unexpected good low temperature properties, in particular a good rheology after having been kept for a prolonged time at a low temperature (e.g. at −30° C.). These compositions are suitable for use as (part of) hydraulic fluid in applications at low temperatures.

Abstract: Perfluoroalkyl-substituted amines, acids, amino acids and thioether acid compounds containing a perfluoroalkyl-iodoalkyl or perfluoroalkyl-alkene group as well as derivatives thereof, are described. They are useful as surfactants in a variety of applications where low surface tensions are required, including coating formulations for glass, wood, metal, cement, paper, textiles, as foam control agents in polyurethane foams and especially in aqueous fire-fighting formulations.

Abstract: A stabilized monomer composition containing at least one ethylenically unsaturated monomer and a combination of N,N-diethylhydroxylamine an N-nitroso-N-phenylhydroxylamine or its salt in a weight ratio of from 1:1 to 10:1 permits the synthesis of 2-hydroxyalkyl (meth)acrylates in particularly high yields and remains stable during prolonged storage.

Abstract: A composition for optical material according to the present invention comprises as essential components, (a) a compound having in one molecule at least one group selected from the group consisting of isocyanate group and isothiocyanate group; (b) a compound having at least one mercapto group in one molecule; and (c) at least one inorganic component selected from the group consisting of sulfur, selenium, and inorganic compounds containing sulfur and/or selenium. A material produced by curing the composition by polymerization has a sufficiently high mechanical strength, and well-balanced optical, properties, i.e., high refractive index and large Abbe's number, and is suitable as an optical material.

Abstract: A composition for fabricating phase-change-material microcapsule and a method for fabricating microcapsule are provided. The composition at least includes 5% to 40% weight percentage of waterborne polyurethane aqueous solution, phase change material, monomer and solid wax. The lipophilic monomer solves in the phase change material and the weight percentage is between about 3% and 12% and the weight ratio of lipophilic monomer to waterborne polyurethane is between about 25% and 50%. The composition is emulsified by stirring and several stages heating process is performed to fabricate the microcapsules.

Abstract: A cellulose-based fire retardant composition is made by (1) adding cellulose to water, thereby forming a solution; (2) adding liquid ammonia to the solution; and (3) subsequently adding solid diammonium phosphate to the solution, thereby forming a viscous cellulose-based fire retardant liquid.

Abstract: A thermal cutoff member and compositions used to manufacture such members are described herein as including at least two organic compounds which, when sufficiently combined, give rise to a component which has a lower melt transition temperature than the initial organic compounds prior to combining the same. The thermal cutoff member is generally utilized in a thermal cutoff construction having an electrical switching unit that changes its operating condition when the member therein melts by being heated to a certain temperature for the particular material that forms the member being utilized.

Abstract: A reaction mixture that is especially suited to generate heat in a controllable manner. The reaction mixture includes exothermic generating particles having a water soluble coating made from polyethylene glycol with a molecular weight between 2000 and 6000; a volatile component, a buffer, an anti-foaming agent, and optionally including an aqueous solution and a thickening agent. The reaction components are mixed together and the mixture increases in temperature to a Set Temperature within a predetermined time, and the mixture remains at the Set Temperature for a longer period of time. In this manner, volatile components can be controllably released to the surrounding environment. The volatile components can be, for example, a perfume, a fragrance, an insect repellent, a fumigant, a disinfectant, a bactericide, an insecticide, a pesticide, a germicide, an acaricide, a sterilizer, a deodorizer, a fogging agent and mixtures of these. Apparatuses and methods that use these reaction mixtures are also disclosed.

Abstract: Described is a polymerizable organic composition comprising: (a) a radically polymerizable gel-free prepolymer of (i) at least one first polymerizable monomer having at least two radically polymerizable ethylenically unsaturated groups, e.g., divinyl benzene, and (ii) at least one first polythiol monomer having at least two thiol groups, e.g., thioglycerol bis(mercaptoacetate); and (b) at least one second polymerizable monomer having at least two radically polymerizable ethylenically unsaturated groups, e.g., divinyl benzene and/or methacrylic anhydride, the first and second radically polymerizable monomers each being substantially free of norbornene groups. The molar equivalent ratio of ethylenically unsaturated groups of (a)(i) to the thiol groups of (a)(ii) is no greater than 1:1. The described polymerizable composition has reduced shrinkage, and a polymerizate prepared therefrom has a refractive index of at least 1.57 and an Abbe number of at least 33.

Abstract: There are provided a pigment-containing coloring material stably dispersible in a high concentration in various organic solvents, and a process for producing the same. The production process of the coloring material is characterized by comprising the steps of: providing a solution comprising (1) a soluble pigment precursor which is convertible into an insoluble pigment, (2) a solvent capable of dissolving the soluble pigment precursor therein, and (3) a stabilizing agent comprising an organic compound having a structure or a functional group capable of stabilizing the dispersibility of the insolubilized pigment in the solvent; and converting said soluble pigment precursor into an insoluble pigment to obtain the coloring material containing the insolubilized pigment dispersed stably in the solvent.

Abstract: Pyrimidine-based crosslinking agents for thermally curable compositions, especially thermally curing coating materials, adhesive, sealing compounds or compounds for producing moldings.

Abstract: Fire extinguishing compositions and methods for extinguishing, controlling, or preventing fires are described wherein the extinguishing agent is a fluorinated ketone having up to two hydrogen atoms, alone, or in admixture with a co-extinguishing agent selected from hydrofluorocarbons, hydrochlorofluorocarbons, perfluorocarbons, perfluoropolyethers, hydrofluoroethers, hydrofluoropolyethers, chlorofluorocarbons, bromofluorocarbons, bromochlorofluorocarbons, iodofluorocarbons, hydrobromofluorocarbons, and mixtures thereof.

Abstract: The invention is a reactive hot melt adhesive composition comprising a cationically polymerizable compound, on the average per molecule, having one or more cyclic ether groups such as epoxy groups, a phthalate diester compound expressed by the following formula (2) and a cationic photo-initiator: wherein in the formula (2), R5 indicates (ChH2hO)iH and R6 indicates (CkH2kO)lH or (CkH2kO)lCkH2k+1, provided that h, i, k and l each are an integer of 1 or more. The present invention provides a reactive hot melt adhesive, in which a curing reaction progresses under application of actinic radiation.

Abstract: A curing composition comprising (1) a fluorine-containing curing monomer containing a fluorinated alkyl group having not less than 6 carbon atoms, (2) a fluorine-containing curing monomer containing a fluorinated alkyl group having not more than 5 carbon atoms, and (3) a polyfunctional curing monomer, the weight ratio of said fluorine-containing curing monomer (1) to said fluorine-containing curing monomer (2) ranging from 75/25 to 99/1. The composition is coated on an optical fiber base and cured by active energy rays to provide a core/clad optical fiber excellent in transparency, mechanical strength, environmental resistance, and optical characteristics.