Abstract: An acrylic rubber composition comprising 5 to 12.5 parts by weight of silica and 5 to 15 parts by weight of graphite as fillers, based on 100 parts by weight of ultracold-resistant acrylic rubber having a glass transition point Tg of ?42° C. or less. Due to the use of ultracold-resistant acrylic rubber, the use environment temperature, i.e., ?30 to +150° C., is satisfied. In addition, the respective use of specific amounts of silica and graphite as fillers allows the formation of bonded piston seals that have roll processability and adhesion equivalent to or higher than those of the existing seals, and that satisfy compression set characteristics.

Abstract: The present invention is directed to a heterophasic polypropylene composition (HC) comprising a modified polypropylene composition (mPP), a process for preparing said heterophasic polypropylene composition (HC) and an article comprising said heterophasic polypropylene composition (HC). The present invention is further directed to the use of a composition comprising a peroxide (PO) and a crosslinking agent (CA) to reduce tigerskin of a polypropylene composition (PP).

Abstract: An insulating resin composition for a DC power cable improves DC electrical properties and extrusion stability, and includes (A) a low-density polyethylene having a complex viscosity ?*100, which is measured at 130° C. and a frequency of 100 rad/s, of 600 to 1,300 Pa·s, wherein a ratio (?*0.1/?*100) of a complex viscosity ?*0.1, which is measured at 130° C. and a frequency of 0.1 rad/s, to the complex viscosity ?*100 is 4 or more; (B) a modified polyethylene; and (C) a stabilizer including a mixture of a hindered phenol antioxidant and a thioether antioxidant. The amount of carbonyl groups introduced into the resin composition through the component (B) is 7×10?6 to 1.3×10?5 mol/g relative to the total mass of the component (A), the component (B), and the component (C).

Abstract: Embodiments described herein provide a coating composition including an aqueous acrylic/polyurethane dispersion. The aqueous acrylic/polyurethane dispersion is produced from at least one isocyanate component, a polyol mixture, and at least one acrylate solvent. The polyol mixture includes a polyester polyol and at least two different oleo-based polyols. The coating composition exhibits improved chemical resistance without sacrificing other properties, such as hardness and abrasion resistance.

Abstract: Provided are a secondary battery separator having good heat durability, high adhesion property with the electrode active material layer formed on the current collector, and good anti-blocking property, and a secondary battery having such a secondary battery separator. The secondary battery separator of the present invention includes an organic separator layer, a heat-durable layer formed adjacent to at least one surface of the organic separator layer, and an adhesive layer formed on the heat-durable layer, wherein the heat-durable layer contains non-conductive particles and a binder, and the adhesive layer contains a particulate polymer having a glass transition temperature (Tg) of 10 to 100° C.

Abstract: In one embodiment, a single component waterborne coating composition includes water; a branched polyester polyurethane dispersion; a polycarbonate polyurethane dispersion blend including a branched polycarbonate PUD and an unbranched, hydroxyl functional, polycarbonate polyurethane dispersion; and a fluorinated acrylic latex resin. In another embodiment, the fluorinated acrylic latex resin may be replaced with a hybrid resin selected from the group consisting of a fluorinated acrylic and polyester polyurethane dispersion hybrid resin and a fluorinated acrylic and polycarbonate polyurethane dispersion hybrid resin.

Abstract: A rubber composition comprises, per 100 parts by weight of a diene rubber containing from 35% to 89% by weight of a modified conjugated diene polymer rubber and from 11% to 40% by weight of a butadiene rubber, from 3 to 60 parts by weight of an aromatic modified terpene resin and from 100 to 150 parts by weight of a filler. A ratio of the compounded amount of the aromatic modified terpene resin to the compounded amount of the butadiene rubber is from 0.5 to 1.3. An aromatic vinyl unit content is from 38% to 48% by weight of the modified conjugated diene polymer rubber, with a vinyl unit content being from 20% to 35% by weight of the modified conjugated diene polymer rubber, and a weight-average molecular weight of the modified conjugated diene polymer rubber being from 600,000 to 1,000,000.

Abstract: A resin composition constituting dielectric resin films of a film capacitor includes a first atom group including at least one functional group selected from among a methylene group, an aromatic ring and an ether group and having a relatively small molar polarizability, and a second atom group including at least one functional group selected from among a hydroxyl group, an amino group and a carbonyl group and having a relatively large molar polarizability. The resin composition satisfies the condition that a value calculated from the formula (sum of absorption band intensities of first atom group)/(sum of absorption band intensities of second atom group) is 1.0 or more. Herein, as absorption band intensities of the functional groups, peak intensities detected in specific wavenumber ranges are employed.

Abstract: Provided is a resin blend including a first resin and a second resin, the second resin having a hydrophobic functional group in a side chain and having a surface energy difference of 0.1 to 20 mN/m from the first resin at 25° C., wherein the resin blend is capable of forming a layer separation structure. Also, provided are a pellet, a method for preparing the same, and a resin molding article having a specific layer separation structure. The resin blend may not only improve mechanical properties and surface hardness of the molding article but also shorten process time, increase productivity and reduce production cost by omitting an additional surface coating step.

Abstract: Nanoparticles of functionalized, cross-linked vinyl polymer, usable as reinforcing filler in a polymeric matrix. The vinyl polymer is a copolymer of at least the following monomers, which are all copolymerizable by free-radical polymerization: a non-aromatic vinyl monomer “A”; a monomer “B” bearing a function Z of formula ?Si—X, where X represents a hydroxyl or hydrolysable group; and a cross-linking monomer “C” which is at least bifunctional from the point of view of the polymerization. The vinyl polymer is preferably a polymethacrylate, in particular a copolymer of methyl methacrylate (monomer A), trimethoxysilylpropyl methacrylate (monomer B) and ethylene glycol dimethacrylate (monomer C), being in the form of nanobeads the diameter of which is of between 10 and 100 nm.

Abstract: Disclosed herein are biodegradable hydrogel scaffolds for use in tissue engineering. The hydrogel scaffolds are composed of synthetic terpolymers complexed with polyvinyl alcohol (PVA), which facilitate cell-sheet and tissue growth. In the presence of a monosaccharide, the PVA-hydrogel is dissolved and cell-sheets are released for harvesting. Further disclosed herein are methods for producing PVA hydrogels which support tissue growth. Tissue engineering applications and methods are also disclosed.

Abstract: Provided is a resin blend including a first resin and a second resin, the second resin having a hydrophobic functional group in a side chain and having a surface energy difference of 0.1 to 20 mN/m from the first resin at 25° C., the resin blend being capable of forming a layer separation structure. Also, provided are a pellet, a method for preparing the same, and a resin molding article having a specific layer separation structure. The resin blend may not only improve mechanical properties and surface hardness of the molding article but also shorten process time, increase productivity and reduce production cost by omitting an additional surface coating step.

Abstract: In an elastomer composition, which preferably comprises an isoprene elastomer, use of an inorganic filler with a compound having the following formula (I), and which is optionally, in all or part, in a polymerized form: wherein R is R6 or OR8; wherein R1, R2, R3, R4, R5, and R6, independently from each other, are chosen from: hydrogen, alkyl, aryl, alkaryl, aralkyl, cycloalkyl, heterocycloalkyl, and alkenyl groups; and wherein R7 and R8, independently from each other, are chosen from: hydrogen, alkyl, aryl, alkaryl, aralkyl, cycloalkyl, alkenyl groups, and metals selected from the group consisting of Na, Li, and Ca.

Abstract: Disclosed is a polymer including a polymer polymerized of a phosphorous-based monomer, a polymer polymerized of a nitrogen-based monomer, or a polymer polymerized of the phosphorous-based monomer and the nitrogen-based monomer. The phosphorous-based monomer has the formula as follows: and the nitrogen-based monomer has the formula as follows: R1 and R3 consists of hydrogen, a phenyl group, a C7-12 alkyl phenyl group, a C1-12 alkyl group, a C2-12 ether group, a C1-12 alkoxyl group, or a C1-12 hydroxylalkyl group, respectively. R2 and R4 consists of a phenylene group, a C7-12 alkyl phenylene group, a C1-12 alkylene group, a C2-12 ether group, a C1-12 alkylene glycol group, or a C1-12 hydroxylalkylene group, respectively.

Abstract: A block copolymer composition containing a diblock copolymer blend including a first poly(methyl methacrylate)-b-poly((trimethylsilyl)methyl methacrylate) diblock copolymer; and, a second poly(methyl methacrylate)-b-poly((trimethylsilyl)methyl methacrylate) diblock copolymer. Also provided are substrates treated with the block copolymer composition.

Abstract: A waterborne coating composition contains a film forming binder dispersed in an aqueous carrier; wherein the binder is an admixture including (A) about 40-60% by weight of an acrylic silane polymer derived from a monomer blend including alkyl (meth)acrylate monomers and at least one silane containing alkyl (meth)acrylate monomer; and (B) about 60-40% by weight of a polyurethane/acrylic hybrid dispersion. The composition is useful for plastic and metal substrates.

Abstract: A resin composition for vibration damping material for a vibration damping material exhibiting high vibration damping performance in a wider temperature range and a vibration damping material using the same are provided. The resin composition contains 100 parts by weight of a resin component A as a matrix and 5 to 300 parts by weight of a resin component B dispersed in the matrix. The resin component B has two or more cyclic structures selected from the group consisting of an aromatic hydrocarbon group, an aliphatic cyclic hydrocarbon group, and a heteroaromatic group, and is in a glassy state at use temperature.

Abstract: Provided is a resin blend including a first resin and a second resin, the second resin having a hydrophobic functional group in a side chain and having a surface energy difference of 0.1 to 20 mN/m from the first resin at 25° C., the resin blend being capable of forming a layer separation structure. Also, provided are a pellet, a method for preparing the same, and a resin molding articlemolding article having a specific layer separation structure. The resin blend may not only improve mechanical properties and surface hardness of the molding articlemolding article but also shorten process time, increase productivity and reduce production cost by omitting an additional surface coating step.

Abstract: An aromatic vinyl-based thermoplastic resin composition includes a rubber-modified acrylic graft copolymer and a branched aromatic vinyl copolymer resin including a silicon compound.

Abstract: The present invention relates to polyethylene compositions comprising one or more ethylene polymers and one or more dendritic hydrocarbon polymer modifiers, in particular, this invention further relates to polyethylene blends comprising one or more ethylene polymers and one or more dendritic hydrocarbon polymer modifiers, wherein the modifier has: 1) a g? value less than 0.75; 2) a Cayley tree topology with a layer number of 2 or more more; and 3) a average Mw between the branch points of 1,500 g/mol or more.

Abstract: Described herein is the synthesis of adhesive complex coacervates and their use thereof. The adhesive complex coacervates are composed of a mixture of one or more polycations and one or more polyanions. The polycations and polyanions in the adhesive complex coacervate are crosslinked with one another by covalent bonds upon curing. The adhesive complex coacervates have several desirable features when compared to conventional bioadhesives, which are effective in water-based applications. The adhesive complex coacervates described herein exhibit good interfacial tension in water when applied to a substrate (i.e., they spread over the interface rather than being beaded up). Additionally, the ability of the complex coacervate to crosslink intermolecularly increases the cohesive strength of the adhesive complex coacervate.

Abstract: Rubber composition based on at least one diene elastomer, a polymer filler as reinforcing filler, a coupling agent providing the bond between the polymer filler and the elastomer. The polymer filler comprises nanoparticles of non-aromatic vinnyl polymer (“NAVP”) bearing a function Z of formula ?Si—X, X representing a hydroxyl or hydrolysable group. The NAVP is in particular a copolymer of methyl methacrylate, trimethoxysilylpropyl methacrylate and ethylene glycol dimethacrylate, in the form of nanobeads the diameter of which is between 10 and 100 nm.

Abstract: The present invention is directed to a first polypropylene composition comprising a propylene copolymer as matrix phase (A) comprising a homo/random/block copolymer consisting of a) a propylene homopolymer (A1); b) a propylene random copolymer (A2); and c) an ethylene-propylene rubber (EPR) (A3) and a polyolefin (B) dispersed in the matrix phase (A), which comprises hydrolysable silicon-containing groups. The present invention is furthermore directed to a second polypropylene composition comprising a matrix phase (A) comprising a propylene homo- or copolymer with an impact strength at +23° C. of at least 40.0 kJ/m2 in a Charpy notched test according to ISO 179-1eA:2000 and a polyolefin (B) dispersed in the matrix phase (A), which comprises hydrolysable silicon-containing groups. The invention is furthermore directed to a production process for the polypropylene compositions and an article made thereof.

Abstract: A resin composition includes a phosphorus-based acrylic copolymer (A) including (a1) an acrylic monomer represented by Formula 1 and (a2) a phosphorus-based acrylic monomer represented by Formula 2 as defined in the specification. The resin composition can have flame retardancy, heat resistance, mechanical properties, and/or flowability, while maintaining properties of high transparency and scratch resistance.

Abstract: The invention provides an infiltrant for dental application that comprises crosslinking monomers. In accordance with the invention the infiltrant has a penetration coefficient PC>50 cm/s, and comprises 0.05%-20% by weight of acid-group-containing monomers.

Abstract: The invention relates to the use of polyorganosiloxanes having 3 or more siloxane units, which has (i) at least one organic component R1, where R1 has at least one carbon-carbon multiple bond, and (ii) at least one hydrocarbon component R2, where R2 has a chain length of 5 to 50 carbon atoms. The polyorganosiloxanes are used in the processing and vulcanization of rubber and are incorporated reactively into it. They give rise to a lowering in the viscosity of the rubber in the course of processing and in some cases to an improvement in the mechanical properties of the vulcanized rubber.

Abstract: Subject of the invention is a hybrid particle comprising at least two vinyl polymers (vinyl polymers A and B), wherein vinyl polymer A comprises colloidal SiO2 particles with an average particle size from 1 to 150 nm and vinyl polymer B is capable of crosslinking hybrid particles to one another.

Abstract: A preferably pulverulent dispersing agent comprising as the component having a dispersing action the combination of (a) at least one representative of polycarboxylate ethers with a weight content of from 0.1 to 20%, (b) at least one representative of polycarboxylate esters with a weight content of from 0 to 20% and (c) at least one representative of non-charged copolymers with a weight content of from 0.1 to 20%, which is accessible by co-spray drying the individual components and which is suitable for controlling the flowability of aqueous chemical construction suspensions is claimed. By the dispersing agents which form in situ according to the invention, a controllable subsequent dosing of dispersing agent can be achieved without an additional process step.

Abstract: The invention relates to a method for producing hybrid-particles containing polymer and SiO2-particles, wherein a) in a first polymerization step in aqueous medium a water-insoluble phase containing one or more monomeric and colloidal SiO2-particles having an average particle diameter of 1 to 150 nm are polymerized, and b) in a second polymerization step in aqueous medium one or more monomers are polymerized in the presence of the polymer obtained in the first polymerization step.

Abstract: Compositions comprising a polymer resin comprising at least one copolymer with hydrolysable groups, an amino acid or diearboxylic acid water-generating organic compound, and a catalyst that comprises a metal atom and at least two ligands taken from the set alkyloxy and earhcxylate are used to form articles that moisture-cure through in-situ generation of water via ring-closing dehydration reactions.

Abstract: A polymer composition, including: a first copolymer, including a first monomer unit derived from a monomer of Formula A: (R1SiO1.5)x(R2SiO1.5)y??Formula A wherein R1 is a polymerizable functional group, R2 is a non-polymerizable group, x is a positive integer, and y is a positive integer, provided that x+y=2n, wherein n is an integer greater than or equal to 3; a second monomer unit copolymerizable with the first monomer unit; and a second polymer having no monomer units derived from a monomer of Formula A; wherein the content of the monomer unit of Formula A is 4 wt % or less, based on the total weight of the polymer components of the polymer composition.

Abstract: Nanoparticles of functionalised, cross-linked vinyl polymer, usable as reinforcing filler in a polymeric matrix. The vinyl polymer is a copolymer of at least the following monomers, which are all copolymerisable by free-radical polymerisation: a non-aromatic vinyl monomer “A”; a monomer “B” bearing a function Z of formula ?Si—X, where X represents a hydroxyl or hydrolysable group; and a cross-linking monomer “C” which is at least bifunctional from the point of view of the polymerisation. The vinyl polymer is preferably a polymethacrylate, in particular a copolymer of methyl methacrylate (monomer A), trimethoxysilyipropyl methacrylate (monomer B) and ethylene glycol dimethacrylate (monomer C), being in the form of nanobeads the diameter of which is of between 10 and 100 nm.

Abstract: Norbornene-based biocidal polymers having primary, secondary or tertiary amine or phosphine end groups, the parent monomers, processes for preparing the monomers and polymers, and their use.

Abstract: The present invention relates to a polyolefin composition comprising (A) a crosslinkable polyolefin with hydrolysable silane groups which upon hydrolysation form an acid or a base, characterised in that the acid or base generates a gel content of at least 40% after 40 hours in the 90° C. cross-linking test, wherein the acid or base is added in an amount of 4.5 mmol/kg to an ethylene/vinyltrimethoxysilane copolymer with a MFR2=2 g/10 min, a density of 923 g/cm3, and 2 wt. % of vinyltrimethoxysilane and then is cross-linked in a waterbath at 90° C., and to a polyolefin composition comprising (i) a crosslinkable polyolefin with hydrolysable silane groups, and (ii) a non-polymeric compound with hydrolysable silane groups which upon hydrolysation form an acid or a base, characterised in that the acid or base generates a gel content of at least 40% after 40 hours in the 90° C. cross-linking test, wherein the acid or base is added in an amount of 4.

Abstract: The adhesive composition of the invention contains (a) organic fine particles comprising at least one selected from the group consisting of alkyl (meth)acrylate ester-butadiene-styrene copolymer or complexes thereof, alkyl (meth)acrylate ester-silicone copolymer or complexes thereof and silicone-(meth)acrylic acid copolymer or complexes thereof.

Abstract: The invention relates to a polymer composition containing 3 to 90% by weight of a copolymer H and 3 to 90% by weight of a copolymer K, the copolymers H and K each having polyether macromonomer structural units and acid monomer structural units, which are present in the copolymers H and K in each case in a molar ratio of 1:20 to 1:1, and at least 20 mol % of all structural units of the copolymer H and at least 25 mol % of all structural units of the copolymer K being present in each case in the form of acid monomer structural units, at least 60 mol % of the polyether macromonomer structural units of the copolymer H being represented by the isoprenol polyether derivative structural units and at least 60 mol % of the polyether macromonomer structural units of the copolymer K being represented by the vinyloxy polyether derivative structural units.

Abstract: The invention relates to a polymer composition containing 3 to 95% by weight of a copolymer H and 3 to 95% by weight of a copolymer K, the copolymers H and K each having polyether macromonomer structural units and acid monomer structural units, which are present in the copolymers H and K in each case in a molar ratio of 1:20 to 1:1, and at least 20 mol % of all structural units of the copolymer H and at least 25 mol % of all structural units of the copolymer K being present in each case in the form of acid monomer structural units, the polyether macromonomer structural units of the copolymers H and K having side chains containing in each case at least 5 ether oxygen atoms, the number of ether oxygen atoms per side chain of the polyether macromonomer structural units of the copolymers H and K varying in each case in such a way that the corresponding frequency distribution diagrams, in which the number of ether oxygen atoms per side chain of a polyether macromonomer structural unit is plotted in each case along

Abstract: A seal for a valve for use in a pharmaceutical dispensing device, which seal is formed from a blend comprising: a thermoplastic elastomer including a propylene component with isotactic crystallinity; and a polymer selected from one or more of polypropylene, polyethylene and copolymers thereof.

Abstract: A method for preparing multi-functional high-trans elastomeric polymers that have various applications such as in vulcanizable rubber compositions, moisture curable resin compositions, as well as other areas.

Abstract: The present invention provides an aqueous metallic coating composition comprising: (A) an aqueous film-forming resin; (B) a curing agent; (C) a phosphoric acid group-containing resin having an acid value of 10 to 200 mg KOH/g and obtained by copolymerizing a phosphoric acid group-containing polymerizable unsaturated monomer (a) represented by formula (1) with other polymerizable unsaturated monomer(s) (b); (D) a nitrogen-containing compound represented by formula (2); and (E) a metallic pigment. The present invention further provides a method for forming a multilayer coating film using the aqueous metallic coating composition.

Abstract: The present invention relates to a polyolefin composition comprising an olefin homo- or copolymer (A) in an amount of 90 wt. % or more, and an olefin homo- or copolymer (B) comprising hydrolysable silicon-containing groups, wherein olefin homo- or copolymer (B) is present in the composition in an amount of from 0.01 to 2 wt. %.

Abstract: A multi-component article with controllable degradation and/or disintegration, comprising: a first part (A) which comprises at least one polyolefin combined with at least one prodegradation/prodisintegration agent; and; a second part (B) which comprises at least one polyolefin combined with at least one prodegradation/prodisintegration agent, provided that said first and said second parts differ at least by either one of type of polyolefin, type of prodegradation/prodisintegration agent and level of prodegradation/prodisintegration agent, the types of polyolefin and of prodegradation/prodisintegration agent and the levels of prodegradation/prodisintegration agent being selected so as said part (B) degrades more slowly than said part (A), and said part (B) at least partially covers said part (A).

Abstract: A sealant or filler of the invention for electrical and electronic components comprises a two or more liquid type organopolysiloxane composition curable by a hydrosilylation reaction, the viscosity of the composition being doubled at room temperature during 10 min. or more from the initial value obtained directly after mixing all the components, and being increased at room temperature from 5-fold to 10-fold of the initial viscosity within another 10 min. The sealant or filler for electrical and electronic components can be cured to a sufficient degree at room temperature and improve reliability of the sealed or filled components.

Abstract: A conjugated diene polymer rubber is provided that includes component (A) and component (B) below, component (A) having a content, with the total amount of component (A) and component (B) as 100% by weight, of from 5% to 90% by weight, and component (B) having a content of from 95% to 10% by weight, Component (A): a conjugated diene polymer rubber component modified with a carbonyl group- and substituted amino group-containing compound Component (B): a conjugated diene polymer rubber component modified with a compound represented by formula (IIa) below (R21O)mSi(R22A)nR234-m-n??(IIa) wherein m denotes a number from 1 to 3, n denotes a number from 1 to 3, m+n is from 2 to 4, R21 and R23 denote a hydrocarbyl group, R22 denotes a hydrocarbylene group, A denotes a substituted amino group or an optionally substituted hydrocarbyloxy group, when there are a plurality of R21s the plurality of R21s may be identical to or different from each other, when there are a plurality of R22s the plurality of R22s may be i

Abstract: The present invention is directed to a first polypropylene composition comprising a propylene copolymer as matrix phase (A) comprising a homo/random/block copolymer consisting of a) a propylene homopolymer (A1); b) a propylene random copolymer (A2); and c) an ethylene-propylene rubber (EPR) (A3) and a polyolefin (B) dispersed in the matrix phase (A), which comprises hydrolysable silicon-containing groups. The present invention is furthermore directed to a second polypropylene composition comprising a matrix phase (A) comprising a propylene homo- or copolymer with an impact strength at +23° C. of at least 40.0 kJ/m2 in a Charpy notched test according to ISO 179-1eA:2000 and a polyolefin (B) dispersed in the matrix phase (A), which comprises hydrolysable silicon-containing groups. The invention is furthermore directed to a production process for the polypropylene compositions and an article made thereof.

Abstract: The present invention provides a crosslinkable and expandable elastomeric material based on and/or containing siloxane polymer, the process for manufacturing of such material and the use of such material and its blends and composites.

Abstract: The invention relates to the use of polyorganosiloxanes having 3 or more siloxane units, which has (i) at least one organic component R1, where R1 has at least one carbon-carbon multiple bond, and (ii) at least one hydrocarbon component R2, where R2 has a chain length of 5 to 50 carbon atoms. The polyorganosiloxanes are used in the processing and vulcanization of rubber and are incorporated reactively into it. They give rise to a lowering in the viscosity of the rubber in the course of processing and in some cases to an improvement in the mechanical properties of the vulcanized rubber.

Abstract: The invention provides for processes to produce elastomeric compositions, the processes including contacting at least one elastomer with a processing aid, wherein the processing aid comprises at least one functionalized polymer having at least one anhydride group. The invention also provides for articles such as innerliners for tires produced from the aforementioned elastomeric compositions.

Abstract: A polymer composition, including: a first copolymer, including a first monomer unit derived from a monomer of Formula A: (R1SiO1.5)x(R2SiO1.5)y??Formula A wherein R1 is a polymerizable functional group, R2 is a non-polymerizable group, x is a positive integer, and y is a positive integer, provided that x+y=2n, wherein n is an integer greater than or equal to 3; a second monomer unit copolymerizable with the first monomer unit; and a second polymer having no monomer units derived from a monomer of Formula A; wherein the content of the monomer unit of Formula A is 4 wt % or less, based on the total weight of the polymer components of the polymer composition.

Abstract: An object of the present invention is to provide a curable composition which has excellent handling properties and which is able to form a cured product excellent in transparency, heat resistance, environment resistance and molding processability. The curable composition of the present invention comprises (a) silica fine particles, (b) a (meth)acrylate having at least two ethylenic unsaturated groups and no ring structure, (c) a (meth)acrylate having an ethylenic unsaturated group and an alicyclic structure, and (d) a polymerization initiator, said silica fine particles (a) are surface-treated with a silane compound (e) represented by the following general formula (1) and a silane compound (f) represented by the following general formula (2).