The present invention provides: a light diffusing agent which enables the achievement of a resin molded body having excellent light diffusibility, light transmission properties, surface hardness and the like; a resin composition which contains this light diffusing agent; and a molded body. One embodiment of the present invention provides a light diffusing agent which contains a copolymer that contains a (meth)acrylate constituent unit (A) represented by general formula (1) and a polyvalent vinyl constituent unit (B) that is copolymerizable with the constituent unit (A). ##STR00001##

The present invention provides: a light diffusing agent which enables the achievement of a resin molded body having excellent light diffusibility, light transmission properties, surface hardness and the like; a resin composition which contains this light diffusing agent; and a molded body. One embodiment of the present invention provides a light diffusing agent which contains a copolymer that contains a (meth)acrylate constituent unit (A) represented by general formula (1) and a polyvalent vinyl constituent unit (B) that is copolymerizable with the constituent unit (A). ##STR00001##

A protective film composition includes a polymer having the following formula:

##STR00001##

each of a, b, and cis amole fraction; a+b+c=1; 0.05a/(a+b+c)0.3; 0.1b/(a+b+c)0.6; 0.1c/(a+b+c)0.6; each of R.sup.1, R.sup.2, and R.sup.3 is a hydrogen atom or a methyl group; R.sup.4 is a hydrogen atom, a butyrolactonyl group, or a substituted or unsubstituted C3 to C30 alicyclic hydrocarbon group; and R.sup.5 is a substituted or unsubstituted C6 to C30 linear or cyclic hydrocarbon group. A method of manufacturing a semiconductor package includes forming a sawing protective film on a semiconductor structure by using the protective film composition and sawing the sawing protective film and the semiconductor structure from the sawing protective film.

The present invention provides a SMC of which excessive thickening with time is suppressed while of which sufficient initial thickening by an isocyanate-based thickener is maintained, particularly of which a decrease in flowability at the time of molding to be easily actualized in the case of containing an aromatic vinyl compound such as styrene is suppressed, and which exhibits excellent storage stability and moldability, a molding material for obtaining the SMC, and a fiber-reinforced composite material using the SMC. The invention provides a molding material including: a matrix resin composition containing the following Component (A), the following Component (B), the following Component (D) and the following Component (E); and the following Component (C), in which a proportion of the Component (E) with respect to 100 parts by mass of a sum of the Component (A) and the Component (B) is 0.002 part by mass or more and 0.08 part by mass or less: Component (A): a compound having either or both of a hydroxyl group and a carboxyl group and a polymerizable unsaturated group, Component (B): an aromatic vinyl compound, Component (C): a reinforcing fiber bundle having a fiber length of 5 mm or more and 120 mm or less, Component (D): an isocyanate compound, and Component (E): a metal chelate compound.

Provided are a monomer which can provide a cured product having both high toughness and rigidity, a monomer composition containing the monomer, the monomer composition used as a dental material monomer composition, a dental material composition containing the monomer composition or the dental material monomer composition, a cured product thereof having excellent mechanical properties, a dental material formed by curing the dental material composition, a method for producing the monomer composition, and a method for producing the dental material. A (meth)acrylate (D) is a reaction product of an amine compound (A) having two or more amino groups, an iso(thio)cyanate compound (B) having two or more iso(thio)cyanato groups, and a hydroxy (meth)acrylate compound (C) having one or more polymerizable groups.

Provided are a monomer which can provide a cured product having both high toughness and rigidity, a monomer composition containing the monomer, the monomer composition used as a dental material monomer composition, a dental material composition containing the monomer composition or the dental material monomer composition, a cured product thereof having excellent mechanical properties, a dental material formed by curing the dental material composition, a method for producing the monomer composition, and a method for producing the dental material. A (meth)acrylate (D) is a reaction product of an amine compound (A) having two or more amino groups, an iso(thio)cyanate compound (B) having two or more iso(thio)cyanato groups, and a hydroxy (meth)acrylate compound (C) having one or more polymerizable groups.

An object of the present invention is to provide a curable composition having sufficient polymerization properties even under acidic conditions. The curable composition of the present invention includes (a) a polymerizable monomer having an acidic group, (b) a transition metal compound, (c) at least one compound selected from benzoxazole compounds and benzothiazole compounds, and (d) a reducing agent.

An object of the present invention is to provide a curable composition having sufficient polymerization properties even under acidic conditions. The curable composition of the present invention includes (a) a polymerizable monomer having an acidic group, (b) a transition metal compound, (c) at least one compound selected from benzoxazole compounds and benzothiazole compounds, and (d) a reducing agent.

A composition for model materials (4a) is used for shaping an optically shaped article by an inkjet optical shaping method, comprises a monofunctional monomer (A) and an oligomer (B) as a photocurable component, further, comprises no polyfunctional monomer (C) as a photocurable component, or comprises a polyfunctional monomer (C) as a photocurable component at 3.0 parts by weight based on 100 parts by weight of a whole composition for model materials, the oligomer (B) has a hydroxyl group or an amino group, and a total molar fraction of the hydroxyl group and the amino group in a total amount of the photocurable components is less than 5.0%. The composition for model materials (4a) can afford an optically shaped article that has flexibility, and does not crack even when it is bent.

The present invention relates to novel photoaligning polymer materials, to their use as orienting layer for liquid crystals, which are used for the production of non-structured and structured optical elements, electro-optical elements, multi-layer systems or in nanoelectronics.