Composition and cured product thereof

A varnish, comprising:

• an olefin-aromatic vinyl compound-aromatic polyene copolymerized oligomer;
• one or more selected from the group consisting of the following (a) to (c):
• (a) a curing agent,
• (b) one or a plurality of resins selected from the group consisting of a hydrocarbon-based elastomer, a polyphenylene ether-based resin, an olefin-aromatic vinyl compound-aromatic polyene copolymer, and an aromatic polyene-based resin, and
• (c) a polar monomer;
• and
• (d) a solvent, and
• wherein the olefin-aromatic vinyl compound-aromatic polyene copolymerized oligomer satisfies all of the following conditions (1) to (4):
• (1) a number average molecular weight of the copolymerized oligomer is 500 or more and less than 12000;
• (2) the aromatic vinyl compound monomer is an aromatic vinyl compound having 8 or more and 20 or less carbon atoms, and a content of a unit of the aromatic vinyl compound monomer is 0 mass % or more and 90 mass % or less;
• (3) the aromatic polyene is one or more selected from the group consisting of polyenes having 5 or more and 20 or less carbon atoms, and a content of the vinyl groups and/or the vinylene groups derived from a unit of the aromatic polyene is 1.5 pieces or more and less than 10 pieces per number average molecular weight;
• and
• (4) the olefin is one or more selected from olefins having 2 or more and 20 or less carbon atoms, and a total of units of the olefin monomer, the aromatic vinyl compound, and the aromatic polyene monomer is 100 mass %.

A molded product, comprising:

• an olefin-aromatic vinyl compound-aromatic polyene copolymerized oligomer satisfying all of the following conditions (1) to (4):
• (1) a number average molecular weight of the copolymerized oligomer is 500 or more and less than 12000;
• (2) the aromatic vinyl compound monomer is an aromatic vinyl compound having 8 or more and 20 or less carbon atoms, and a content of a unit of the aromatic vinyl compound monomer is 0 mass % or more and 90 mass % or less;
• (3) the aromatic polyene is one or more selected from polyenes having 5 or more and 20 or less carbon atoms and having a plurality of vinyl groups and/or vinylene groups in the molecule, and a content of the vinyl groups and/or the vinylene groups derived from a unit of the aromatic polyene is 1.5 pieces or more and less than 10 pieces per number average molecular weight;
• and
• (4) the olefin is one or more selected from olefins having 2 or more and 20 or less carbon atoms, and a total of units of the olefin monomer, the aromatic vinyl compound, and the aromatic polyene monomer is 100 mass %.

A cured product, comprising:

• an olefin-aromatic vinyl compound-aromatic polyene copolymerized oligomer, as a product of a reaction using a single-site-coordinated polymerization catalyst composed of a transition metal compound represented by the following general formula (1) and a co-catalyst:
• wherein M is zirconium or hafnium;
• Cp1 and Cp2 are cyclopentadienyl groups having no substituent, or cyclopentadienyl groups having one or two alkyl substituents having no cyclic structure;
• the Cp1 and Cp2 are the same or different from each other;
• one of the Cp1 and Cp2 groups is optionally an indenyl group having no substituent, or an indenyl group having one or two alkyl substituents having no cyclic structure;
• Y is carbon, silicon, germanium or boron having a bond with Cp1 and Cp2 and having a hydrogen atom or a substituent;
• the substituents are different from each other or the same, and optionally have a cyclic structure;
• X is selected from the group consisting of hydrogen, halogens, alkyl groups and aryl groups, or two X are bonded to each other to form a diene group.

A method for manufacturing a varnish, the method comprising the steps of:

• obtaining an olefin-aromatic vinyl compound-aromatic polyene copolymerized oligomer, as a product of a reaction using a single-site-coordinated polymerization catalyst composed of a transition metal compound represented by the following general formula (1) and a co-catalyst:
• wherein M is zirconium or hafnium;
• Cp1 and Cp2 are cyclopentadienyl groups having no substituent, or cyclopentadienyl groups having one or two alkyl substituents having no cyclic structure;
• the Cp1 and Cp2 are the same or different from each other;
• one of the Cp1 and Cp2 groups is optionally an indenyl group having no substituent, or an indenyl group having one or two alkyl substituents having no cyclic structure;
• Y is carbon, silicon, germanium or boron having a bond with Cp1 and Cp2 and having a hydrogen atom or a substituent;
• the substituents are different from each other or the same, and optionally have a cyclic structure;
• X is selected from the group consisting of hydrogen, halogens, alkyl groups and aryl groups, or two X are bonded to each other to form a diene group;
• and
• adding a solvent to the olefin-aromatic vinyl compound-aromatic polyene copolymerized oligomer to prepare a varnish.