A polymer which has M.sub.n at least 4,000 and comprises polymerized units of a compound of formula NAr.sup.1A.sup.2A.sup.3, wherein Ar.sup.1, Ar.sup.2 and Ar.sup.3 independently are C.sub.6-C.sub.40 aromatic substituents; Ar.sup.1, Ar.sup.2 and Ar.sup.3 collectively contain no more than one nitrogen atom and at least one of Ar.sup.1, Ar.sup.2 and Ar.sup.3 contains a vinyl group attached to an aromatic ring.

Provided are a monofunctional phenolic compound used for producing an active ester resin capable of forming a cured product having excellent dielectric properties and excellent heat resistance, an active ester resin and a method for producing the active ester resin, and a thermosetting resin composition and a cured product of the thermosetting resin composition. Specifically, provided are a monofunctional phenolic compound including one or more vinylbenzyl groups and an active ester resin including a vinylbenzyl structure attached to a terminal group of the molecular chain and derived from the monofunctional phenolic compound. The vinylbenzyl structure preferably includes a vinylbenzyl-modified aryloxycarbonyl group.

Provided are a monofunctional phenolic compound used for producing an active ester resin capable of forming a cured product having excellent dielectric properties and excellent heat resistance, an active ester resin and a method for producing the active ester resin, and a thermosetting resin composition and a cured product of the thermosetting resin composition. Specifically, provided are a monofunctional phenolic compound including one or more vinylbenzyl groups and an active ester resin including a vinylbenzyl structure attached to a terminal group of the molecular chain and derived from the monofunctional phenolic compound. The vinylbenzyl structure preferably includes a vinylbenzyl-modified aryloxycarbonyl group.

An aspect of the present invention is a resin composition containing at least one of a polyphenylene ether compound (A), having at least one of a group represented by the following Formula (1) and a group represented by the following Formula (2) in the molecule, and a maleimide compound (B); and ceramic particles (C) including aluminum titanate particles (C1).

##STR00001##

In Formula (1), p represents 0 to 10, Ar represents an arylene group, and R.sub.1 to R.sub.3 each independently represent a hydrogen atom or an alkyl group.

##STR00002##

In Formula (2), R.sub.4 represents a hydrogen atom or an alkyl group.

A resin composition contains a polyphenylene ether compound (A) having at least one of a group represented by the following Formula (1) and a group represented by the following Formula (2) in the molecule, a curing agent (B), a titanate compound filler (C), and a silica filler (D), in which the content ratio of the titanate compound filler (C) to the silica filler (D) is 10:90 to 90:10 as a mass ratio.

##STR00001##

In Formula (1), p represents 0 to 10, Ar represents an arylene group, and R.sub.1 to R.sub.3 each independently represent a hydrogen atom or an alkyl group.

##STR00002##

In Formula (2), R.sub.4 represents a hydrogen atom or an alkyl group.

The problem addressed was that of providing novel polymers which are preparable with a low level of complexity, with the possibility of controlled influence on the physicochemical properties thereof within wide limits in the course of synthesis, and which are usable as active media in electrical charge storage elements for high storage capacity, long lifetime and stable charging/discharging plateaus. 9,10-Bis(1,3-dithiol-2-ylidene)-9,10-dihydroanthracene polymers consisting of an oligomeric or polymeric compound of the general formula I have been found. ##STR00001##

The problem addressed was that of providing novel polymers which are preparable with a low level of complexity, with the possibility of controlled influence on the physicochemical properties thereof within wide limits in the course of synthesis, and which are usable as active media in electrical charge storage elements for high storage capacity, long lifetime and stable charging/discharging plateaus. 9,10-Bis(1,3-dithiol-2-ylidene)-9,10-dihydroanthracene polymers consisting of an oligomeric or polymeric compound of the general formula I have been found. ##STR00001##

A composition of matter includes a mixture of styrene derivative monomers and methacrylate/acrylate derivative monomers, which have one or more urethane, carbamate, amide, and/or amine functional groups, and initiators, and the compositions are used to achieve composition control of the forming polymer, with the mole fraction of acrylate/methacrylate and styrene moieties in the forming polymer determined preferably by the chemistry and composition of the feeding monomers rather than the viscosity of the monomers.

A curable composition capable of manufacturing a cured product having a high refractive index is provided. The curable composition contains a polymerizable compound represented by formula (1) and inorganic particles. In formula (1), L.sub.a represents a divalent linking group, and the divalent linking group includes at least one of a divalent aromatic group, a divalent polycyclic aliphatic group and an alkylene group having an aromatic group, Ar represents an aromatic group, and R represents an aromatic group optionally having one or more substituents or a polycyclic aliphatic group optionally having one or more substituents.

##STR00001##

A method of capturing a basic, nitrogen-containing compound is provided. The basic, nitrogen-containing compound is captured by sorption (e.g., adsorption) on a sulfonic-acid containing polymeric material. The sulfonic acid-containing polymeric material is formed from a polymerizable composition that contains a free-radically polymerizable spirobisindane monomer. Additionally, a polymeric material is provided that is a reaction product of a sulfonic acid-containing polymeric material having at least one SO3H group and a basic, nitrogen-containing compound of formula Q. This polymeric material has at least one group of formula SO.sub.3.sup.(QH.sup.+).