Provided is a cyclopentene ring-opening copolymer comprising a structural unit derived from cyclopentene and a structural unit derived from a norbornene compound with three or more rings, wherein the content of the structural unit derived from a norbornene compound with three or more rings is 40 to 80 wt % in relation to the whole of the repeating structural units in the cyclopentene ring-opening copolymer.

Aspects of the present disclosure generally describe polyarylether ketones and methods of use. In some aspects, a composition includes one or more polymers of formula (IV): ##STR00001##

The present invention is generally related to various types of compositions that comprise a polyindane resin. In particular, the polyindane resins may be utilized in various polymer-based and elastomer-based formulations in order to enhance several properties and characteristics of those formulations. More specifically, adhesive formulations are provided that comprise at least one polyindane resin, which may be used to replace or enhance the functionality of existing hydrocarbon resins typically used in adhesive formulations. Compositions comprising at least one thermoplastic elastomer and at least one polyindane resin are also provided.

The disclosure is related to compositions including viscoelastic materials. The compositions are suitable for use in earpieces such as in-ear earpieces.

Aspects of the present disclosure generally describe polyarylether ketones and methods of use. In some aspects, a composition includes one or more polymers of formulae (I), (II), or (III): ##STR00001##

The present invention provides: a copolymer (A) which is a copolymer obtained by copolymerizing one or plural cycloolefin monomers and one or plural acyclic olefin monomers, or by copolymerizing two or more cycloolefin monomers, wherein a glass transition temperature (Tg) is 100 C. or higher, a refractive index is 1.545 or higher, and an Abbe's number is 50 or larger; a polymer (B) selected from: a ring-opening homopolymer obtained by ring-opening polymerization of only a monomer represented by formula (I), a ring-opening copolymer obtained by ring-opening copolymerization of the monomer represented by formula (I) and a monomer capable of ring-opening copolymerization with the monomer represented by formula (I), a hydrogenated product of the ring-opening homopolymer and a hydrogenated product of the ring-opening copolymer; a forming material containing the copolymer (A) or the polymer (B); and a resin formed article obtained by forming the forming material.

##STR00001##

Disclosed is a polybenzoxazime precursor and a method of preparing the same. The polybenzoxazime precursor is used to prepare a hardened material having improved thermal characteristics, having high thermal and flame-retardant characteristics while maintaining its excellent electrical characteristics, or having high thermal and electrical characteristics, thus being available for use in a copper clad laminate, a semiconductor encapsulate, a printed circuit board, an adhesive, a paint, and a mold.

A copolymer including a structural unit represented by Chemical Formula 1 ##STR00001##
wherein the copolymer is capable of improving luminous efficiency and durability, particularly, an improvement in luminescence life-span, of an electroluminescence device, particularly a quantum dot electroluminescence device.