The purpose of the present invention is to provide a weather-resistant hard coat composition for a metal, the composition being capable of efficiently forming a coating film excelling in weather resistance, scratch resistance, and flexibility. The present invention provides: a weather-resistant hard coat composition for a metal, the composition containing a polyorganosilsesquioxane having a constituent unit represented by Formula (1); a cured product thereof; and a coated metal substrate having a metal substrate and a coating film formed on at least one surface of the metal substrate. The coating film is a layer of a cured product of the weather-resistant hard coat composition for a metal. [In Formula (1), R.sup.1 represents a group containing an active energy ray-curable functional group.]

[R.sup.1SiO.sub.3/2]  (1)

Provided are a window film composition, a flexible window film formed therefrom and a flexible display device containing the same, the composition comprising: a crosslinking agent represented by RX-X—Z—Y-RY (RX and RY each independently represent a glycidyl group, a glycidyl group-containing functional group, an alicyclic epoxy group or an alicyclic epoxy group-containing functional group); an epoxy group-containing siloxane resin; and an initiator.

Provided is a polyorganosilsesquioxane capable of forming, when cured, a cured product that offers high surface hardness and good heat resistance, is highly flexible, and has excellent processability. The present invention relates to a polyorganosilsesquioxane including a constitutional unit represented by Formula (1). The polyorganosilsesquioxane includes a constitutional unit represented by Formula (I) and a constitutional unit represented by Formula (II) in a mole ratio of the constitutional unit represented by Formula (I) to the constitutional unit represented by Formula (II) of 5 or more. The polyorganosilsesquioxane has a total proportion of the constitutional unit represented by Formula (1) and a constitutional unit represented by Formula (4) of 55% to 100% by mole based on the total amount (100% by mole) of all siloxane constitutional units. The polyorganosilsesquioxane has a number-average molecular weight of 1000 to 3000 and a molecular-weight dispersity (weight-average molecular weight to number-average molecular weight ratio) of 1.0 to 3.0.

[R.sup.1SiO.sub.3/2]  (1)

[Chem. 2]

[R.sup.aSiO.sub.3/2]  (I)

[Chem. 3]

[R.sup.bSiO(OR.sup.c)]  (II)

[Chem. 4]

[R.sup.1SiO(OR.sup.c)]  (4)

Adhesion promoters, Curable compositions containing the adhesion promoters, cured compositions that are formed from the curable compositions, and articles containing the cured compositions are provided. The adhesion promoter has at least one epoxide group and a plurality of hydrolyzable silyl groups. The curable compositions include an adhesion promoter, an epoxy resin, and a curing agent for the epoxy resin that has at least two amino groups that are primary and/or secondary amino groups.

To prevent gelling even during storage for a long time period under high temperature or room temperature, and to achieve rapid curing under a room-temperature condition at the time of photoirradiation, provided are a photocationically curable composition containing a cationically polymerizable monomer and photoacid generators, and being substantially free of a hydrogen ion scavenger, wherein the photoacid generators include: at least one kind of photoacid generator selected from a photoacid generator formed of an ion pair whose anion is a noncoordinating anion, and a photoacid generator formed of a zwitterionic compound whose anionic moiety is a noncoordinating anionic moiety; and at least one kind of photoacid generator selected from a photoacid generator formed of an ion pair whose anion is not a noncoordinating anion and a photoacid generator formed of a zwitterionic compound whose anionic moiety is not a noncoordinating anionic moiety, and a dental curable composition using the same.

A composition that can be used to form an epoxy-based coating for use in wet environments, the coating exhibiting anti-fouling/foul-releasing properties, improved corrosion resistance, increased mechanical strength, or bending strength of at least 10 mm (relative to a control coating).

Provided is a polyorganosilsesquioxane capable of forming, when cured, a cured product that offers high surface hardness and good heat resistance, is highly flexible, and has excellent processability. The present invention relates to a polyorganosilsesquioxane including a constitutional unit represented by Formula (1). The polyorganosilsesquioxane includes a constitutional unit represented by Formula (I) and a constitutional unit represented by Formula (II) in a mole ratio of the constitutional unit represented by Formula (I) to the constitutional unit represented by Formula (II) of 5 or more. The polyorganosilsesquioxane has a total proportion of the constitutional unit represented by Formula (1) and a constitutional unit represented by Formula (4) of 55% to 100% by mole based on the total amount (100% by mole) of all siloxane constitutional units. The polyorganosilsesquioxane has a number-average molecular weight of 1000 to 3000 and a molecular-weight dispersity (weight-average molecular weight to number-average molecular weight ratio) of 1.0 to 3.0.
[R.sup.1SiO.sub.3/2]  (1)
[Chem. 2]
[R.sup.aSiO.sub.3/2]  (I)
[Chem. 3]
[R.sup.bSiO(OR.sup.c)]  (II)
[Chem. 4]
[R.sup.1SiO(OR.sup.c)]  (4)

A purpose of the present invention is to provide a photosensitive resin composition which retains satisfactory image resolution and gives cured objects reduced in wet-heat dissolution or contamination and having satisfactory wet-heat adhesiveness. The photosensitive resin composition of the present invention comprises: (A) a cationic photopolymerization initiator which comprises a salt of a cation with an anion represented by formula (1) (wherein R.sub.1 to R.sub.4 each independently represent a C1.sub.−18 alkyl or C.sub.6-14 aryl group, provided that at least one of R.sub.1 to R.sub.4 represents a C.sub.6-14 aryl group); and (B) an epoxy compound. R.sub.1 to R.sub.4 may be each independently either a phenyl group having one or more perfluoroalkyl groups as substituents or a phenyl group having one or more fluorine atoms as substituents. R.sub.1 to R.sub.4 may be each independently a pentafluorophenyl or bis(trifluoromethyl)phenyl group. ##STR00001##

Provided are [1] a coating composition containing inorganic oxide particles (A), an epoxy compound (b1) having an organosilane moiety, a polyglycerol polyglycidyl ether (b2) having three or more epoxy groups, and a photocationic polymerization initiator (C), [2] a spectacle lens including a hard coat layer obtainable by curing the coating composition described in [1] above and a substrate, and [3] a method for producing a spectacle lens, including a step of applying the coating composition described in [1] above onto a substrate and a step of curing the applied coating composition by irradiation with light.

Provided is an epoxy resin composition that gives a cured product having excellent adhesion to metal and low dielectric characteristics, and that has good workability during use and high storage stability. Specifically, provided is an epoxy resin composition comprising a specific epoxy resin and a specific phenol-based curing agent.