The present invention relates to a new photo-initiating composition for red and near infrared-induced photopolymerization, method of using same in photopolymerization reactions and polymers obtained by such method.

Disclosed herein is a fiber having a sheath including a polymer and a core including a non-cholesteric liquid crystal. The sheath is transparent to visible light. The fiber may an average diameter of no more than 10 microns, and at least 90% of the fiber has a diameter within 20% of the average diameter. The sheath may include a compound capable of photoisomerization that extends into the core. The interference color of the fiber may be reversibly changed by exposure to light or a temperature change.

Disclosed herein is a fiber having a sheath including a polymer and a core including a non-cholesteric liquid crystal. The sheath is transparent to visible light. The fiber may an average diameter of no more than 10 microns, and at least 90% of the fiber has a diameter within 20% of the average diameter. The sheath may include a compound capable of photoisomerization that extends into the core. The interference color of the fiber may be reversibly changed by exposure to light or a temperature change.

First embodiment of a (meth)acrylic copolymer in the present invention includes following: a (meth)acrylic copolymer having at least one kind of constitutional unit selected from the group consisting of a constitutional unit (A1) having at least one kind of structure (I) selected from the group consisting of structures represented by the following formula (1), formula (2), or formula (3) and a constitutional unit (A2) having a triorganosilyloxycarbonyl group and a constitutional unit (B) derived from a macromonomer (b): ##STR00001## (where, X represents —O—, —S—, or —NR.sup.14—, R.sup.14 represents a hydrogen atom or an alkyl group, R.sup.1 and R.sup.2 each represent a hydrogen atom or an alkyl group having from 1 to 10 carbon atoms, R.sup.3 and R.sup.5 each represent an alkyl group having from 1 to 20 carbon atoms, a cycloalkyl group, or an aryl group, and R.sup.4 and R.sup.6 each represent an alkylene group having from 1 to 10 carbon atoms).

First embodiment of a (meth)acrylic copolymer in the present invention includes following: a (meth)acrylic copolymer having at least one kind of constitutional unit selected from the group consisting of a constitutional unit (A1) having at least one kind of structure (I) selected from the group consisting of structures represented by the following formula (1), formula (2), or formula (3) and a constitutional unit (A2) having a triorganosilyloxycarbonyl group and a constitutional unit (B) derived from a macromonomer (b): ##STR00001## (where, X represents —O—, —S—, or —NR.sup.14—, R.sup.14 represents a hydrogen atom or an alkyl group, R.sup.1 and R.sup.2 each represent a hydrogen atom or an alkyl group having from 1 to 10 carbon atoms, R.sup.3 and R.sup.5 each represent an alkyl group having from 1 to 20 carbon atoms, a cycloalkyl group, or an aryl group, and R.sup.4 and R.sup.6 each represent an alkylene group having from 1 to 10 carbon atoms).

To provide a composition excellent in self-healing ability, and to provide a method for producing the composition. The composition contains a diene-based rubber, an anthracene compound having at least one substituent selected from the group consisting of a nitrile oxide group, an azido group, and a thiol group, the anthracene compound being incorporated into the diene-based rubber, and a crosslinking agent having two or more dienophile structures.

To provide a composition excellent in self-healing ability, and to provide a method for producing the composition. The composition contains a diene-based rubber, an anthracene compound having at least one substituent selected from the group consisting of a nitrile oxide group, an azido group, and a thiol group, the anthracene compound being incorporated into the diene-based rubber, and a crosslinking agent having two or more dienophile structures.

To provide a composition excellent in self-healing ability, and to provide a method for producing the composition. The composition contains a diene-based rubber, an anthracene compound having at least one substituent selected from the group consisting of a nitrile oxide group, an azido group, and a thiol group, the anthracene compound being incorporated into the diene-based rubber, and a crosslinking agent having two or more dienophile structures.

Two-part cyanoacrylate compositions, methods for making same, and uses therefor are described. The compositions can be used to bond a variety of substrates including plastics and metals. The compositions remain effective after thermal ageing and humid ageing.

A heat curable resin composition which allows voids to be removed by heating and vacuum operation after reflow soldering, and a circuit board with an electronic component mounted thereon are provided. The heat curable resin composition of the present embodiment includes a liquid epoxy resin, a hemiacetal ester derived from monocarboxylic acid and polyvinyl ether, a curing agent, and a filler.