Poly(ether ketone ketone) (PEKK) composites include reinforcing fibers in a PEKK polymer matrix that includes a PEKK polymer. It was surprisingly discovered that by washing unneutralized PEKK polymer powder with an acid or base, the melt stability of the PEKK polymers can be improved, as compared with PEKK polymers prepared by conventional methods. The PEKK composites are especially well-suited for fabrication of thick composite parts where melt stability is especially important.

A ring-opened copolymer including structural units derived from a norbornene compound having a specific structure and structural units derived from a monocyclic olefin, wherein the proportion of the structural units derived from a norbornene compound is 25 to 90 wt % and the proportion of the structural units derived from a monocyclic olefin is 10 to 75 wt % relative to the total repeating structural units in the ring-opened copolymer, the weight average molecular weight of the ring-opened copolymer is 100,000 to 1,000,000, and the cis/trans ratio of the ring-opened copolymer is 0/100 to 50/50.

A thermoelectric conversion element includes: a thermoelectric conversion layer containing a thiophene polymer, in which a peak intensity of a diffraction angle (2θ) of 7.9° is 5 times or more a peak intensity of a diffraction angle (2θ) of 25.8° in an X-ray diffraction spectrum of the thermoelectric conversion layer.

A ring-opened copolymer composition comprising a ring-opened copolymer containing structural unit derived from a norbornene compound represented by general formula (1) below and structural unit derived from a monocyclic olefin, wherein a content of a norbornene compound represented by general formula (1) is 1 ppm by weight or more and 1000 ppm by weight or less based on the ring-opened copolymer is provided.

##STR00001## wherein R.sup.1 to R.sup.4 are each a hydrogen atom, a hydrocarbon group having 1 to 20 carbon atoms, or a substituent containing a halogen atom, a silicon atom, an oxygen atom or a nitrogen atom, and R.sup.2 and R.sup.3 may be bonded to each other to form a ring, and “m” is 0 or 1.

A high purity raw material is provided with which an organic EL material exhibiting high luminance, high efficiency, low voltage driving, and long lifetime can be synthesized. A method for purifying the raw material and a method for producing a light-emitting material synthesized using the high purity raw material are also provided. A means for solving the problem is a compound which is a raw material for synthesizing an organic EL material. In the compound, the content of an impurity having a molecular weight larger than the molecular weight of the compound is 0.15% or less, and the content of the impurity is a percentage of the sum of peak areas having a retention time shorter than the retention of a peak identified as the compound in a chromatogram of organic solvent-based size-exclusion chromatography relative to the sum of all peak areas.

Disclosed herein are polymer embodiments comprising nanohoop-containing polymer backbones and methods of making and using the same. The disclosed polymer embodiments exhibit unique radial and linear conjugation and can be used in a variety of devices, such as electronic and/or optoelectronic devices.

A method for fabricating an absorbent article on which a conductive paste with good conductivity and adhesion is printed or coated and which is capable of receiving excretions discharged from a user's body is proposed. The method can include: a PEDOT dispersion polymerization step in which a 3,4-ethylenedioxythiophene (EDOT) monomer is polymerized using a dispersion polymerization method to produce poly(3,4-ethylenedioxythiophene) (PEDOT) nanoparticles; a step in which, after polymerization of the PEDOT nanoparticles is completed, residual dispersion stabilizer and oxidizer are removed and the PEDOT nanoparticles are recovered; a step in which the recovered PEDOT nanoparticles are produced into a conductive paste; and a step in which the conductive paste based on the PEDOT nanoparticles is printed or coated.

A process has the ability to produce polyalkenamer-containing compositions. Stages of the process include converting at least one cycloalkene by ring-opening metathetic polymerization to obtain a polyalkenamer-containing product mixture, and working up the product mixture to remove at least one of a monomer and an oligomer of the at least one cycloalkene to obtain the polyalkenamer-containing composition. The working up stage is effected by a diafiltration.

The present invention relates to a process for producing cycloalkenamer-containing compositions and to such cycloalkenamer-containing compositions. The invention further relates to the use of these cycloalkenamer-containing compositions in the field of packaging materials, especially for food and drink.

A process for producing cycloalkenamer-containing compositions involves converting at least one cycloalkene by ring-opening metathetic polymerization to obtain a polyalkenamer-containing product mixture. The product mixture is worked up to remove monomers and oligomers of the cycloalkenes to obtain the polyalkenamer-containing composition by extraction with CO.sub.2. The extraction involves at least two stages: an extraction with liquid CO.sub.2 under the supercritical conditions, and then an extraction with supercritical CO.sub.2. Such cycloalkenamer-containing compositions can be used, for example, in the field of packaging materials, especially for food and drink.