Abstract: A novel cycloolefin copolymer that can be employed in the production of molding with fewer defects, for example, fewer gel particles (fish eyes). There is provided a cycloolefin copolymer comprising 80 to 20 mol % of repeating units derived from an ?-olefin monomer and 20 to 80 mol % of repeating units derived from at least one cycloolefin monomer selected from the group consisting of monomer of the general formula (I), monomer of the general formula (II), monomer of the general formula (III), monomer of the general formula (IV) and monomer of the general formula (V), wherein with respect to the repeating units derived from cycloolefin monomer, the proportion thereof being present in the form of dimer (Rd) is 50 mol % or below and the proportion thereof being present in the form of trimer (Rt) 5 mol % or above.

Abstract: It is an object of the invention to provide a separation method of an adherend capable of easily and reliably separating an adherend stuck using an adhesive, a method for recovering an electronic part from an electronic part laminate, and a separation method of laminate glass. The invention provides a separation method of an adherend, which is a method of separating an adherend stuck by using an adhesive, and comprises the steps of: air-tightly sealing the adherend together with a fluid being a gas at a normal temperature and normal pressure in a pressure resistant container, making the inside of the pressure resistant container in a high pressure state, and releasing the pressure of the inside of the pressure resistant container.

Abstract: It is an object of the present invention to provide a method of producing a polyvinyl acetal resin by which a polyvinyl acetal resin having a high acetalization degree can be produced even in a solid catalyst system, a polyvinyl butyral resin produced by the above-mentioned production method of a polyvinyl acetal resin, and a method of producing an esterified polyvinyl alcohol resin by which the esterification can be performed at high efficiency even in a solid catalyst system. The present invention is a method of producing a polyvinyl acetal resin, wherein a solution or a suspension containing a polyvinyl alcohol resin and a carbonyl compound is pressurized in the presence of a solid catalyst.

Abstract: A pressure-sensitive adhesive composition includes a component (i) and a component (ii) and a component (i), the component (i) being a copolymer (I) obtained by hydrogenating a copolymer (I?) having a structure shown by [A-B]n, the component (ii) being a copolymer (II) obtained by hydrogenating a copolymer (II?) including the polymer block A having at least 80% of an aromatic alkenyl compound unit content at a terminal and at least one block B having a specified conjugated diene compound unit content and a specified conjugated diene compound-derived vinyl bond content in the intermediate portion, the mass ratio of component (i) to the component (ii), and that in terms of the total amount of A to B included in the copolymer (I?) and the copolymer (II?) being within given ranges, respectively, 80% or more of conjugated diene compound-derived double bonds included in the copolymers (I?) and (II?) being hydrogenated.

Abstract: It is an object of the invention to provide a method for producing a modified polymer compound and a production apparatus of a modified polymer capable of producing a modified polymer compound with a high purity in a short time, and such a modified polymer compound. The invention provides a method for producing a modified polymer compound, which comprises chemically modifying a polymer compound in a supercritical fluid or a high temperature and high pressure fluid, said modified polymer compound being composed of monomer units obtainable by chemically modifying part of or all of monomer units composed of the polymer compound before modification reaction.

Abstract: A novel cycloolefin copolymer that can be employed in the production of molding with fewer defects, for example, fewer gel particles (fish eyes). There is provided a cycloolefin copolymer comprising 80 to 20 mol % of repeating units derived from an ?-olefin monomer and 20 to 80 mol % of repeating units derived from at least one cycloolefin monomer selected from the group consisting of monomer of the general formula (I), monomer of the general formula (II), monomer of the general formula (III), monomer of the general formula (IV) and monomer of the general formula (V), wherein with respect to the repeating units derived from cycloolefin monomer, the proportion thereof being present in the form of dimer (Rd) is 50 mol % or below and the proportion thereof being present in the form of trimer (Rt) 5 mol % or above.

Abstract: Disclosed is a surface protection film which has excellent initial adhesive force and can be easily removed from an object to which it is adhered. The adhesive force of this surface protection film does not undesirably increase as time passes. Specifically disclosed is a surface protection film wherein a rubber adhesive layer containing a rubber resin is arranged on a polyolefin substrate. The rubber resin is composed of a styrene elastomer which has a block copolymer of a styrene polymer block (A) and an olefin elastomer component (B), a block copolymer of a styrene polymer block (A) and a random copolymer block (B?) of styrene and an olefin, or a hydrogenated product of either of the block copolymers as a main component. The rubber adhesive layer has a tensile storage modulus at a frequency of 10 Hz of not less than 2.5×109 Pa at ?100° C., and a shear storage modulus at a frequency of 10 Hz of from 5×104 to 5×106 Pa at 23° C.

Abstract: It is the object of the present invention to provide a retardation film comprising a norbornene type copolymer, being excellent in heat resistance, low specific gravity, low birefringence, low photoelasticity, and low chromatic dispersion and having high performance of retardation compensation.

Abstract: It is an object of the present invention to provide a method of producing a polyvinyl acetal resin by which a polyvinyl acetal resin having a high acetalization degree can be produced even in a solid catalyst system, a polyvinyl butyral resin produced by the above-mentioned production method of a polyvinyl acetal resin, and a method of producing an esterified polyvinyl alcohol resin by which the esterification can be performed at high efficiency even in a solid catalyst system. The present invention is a method of producing a polyvinyl acetal resin, wherein a solution or a suspension containing a polyvinyl alcohol resin and a carbonyl compound is pressurized in the presence of a solid catalyst.

Abstract: This invention provides a method for producing a polymer alloy, a polymer alloy as well as a molded article, a transparent molded article and an optical film, which is obtainable by using the polymer alloy. The invention is a method for producing a polymer alloy, which comprises at least: a step 1 of mixing two or more resins incompatible with each other at ambient temperature and pressure with a solvent being in a liquid or gas state at ambient temperature and pressure; a step 2 of heating and applying pressure to said solvent into a high-temperature and high-pressure fluid or a supercritical fluid and mixing the solvent in this state; and, a step 3 of cooling the mixture obtained in said step 2 rapidly to the glass transition temperature or less without releasing the pressure of the mixture.

Abstract: It is an object of the invention to provide a separation method of an adherend capable of easily and reliably separating an adherend stuck using an adhesive, a method for recovering an electronic part from an electronic part laminate, and a separation method of laminate glass. The invention provides a separation method of an adherend, which is a method of separating an adherend stuck by using an adhesive, and comprises the steps of: air-tightly sealing the adherend together with a fluid being a gas at a normal temperature and normal pressure in a pressure resistant container, making the inside of the pressure resistant container in a high pressure state, and releasing the pressure of the inside of the pressure resistant container.

Abstract: The present invention aims to provide a method for producing a resin fine particle by which a resin fine particle with high sphericity and even particle diameter can easily be obtained, a resin fine particle obtained by the method for producing a resin fine particle, a polyolefin type resin fine particle, a polyester type resin fine particle, and an acrylic resin fine particle. The present invention is a method for producing a resin fine particle, which comprises a step 1 of heating and/or pressurizing a mixture of a resin and a fluid in which the resin is not dissolved in a normal temperature and normal pressure for making at least one component of the fluid supercritical state or subcritical state and a step 2 of decreasing the temperature of the fluid for releasing the pressure.

Abstract: It is an object of the invention to provide a thermoplastic saturated norbornene resin film, an optical film, a protective film for a polarizer, a retardation film, a polarizing plate obtainable by this, which realizes the compatibility between excellent physical properties and optical characteristics, and a method of producing a thermoplastic saturated norbornene resin film. The invention relates to a thermoplastic saturated norbornene resin film, which is obtainable by using a thermoplastic saturated norbornene resin composition containing a thermoplastic saturated norbornene resin in an amount of 100 parts by weight and a rubber polymer in an amount of 5 to 40 parts by weight, parallel transmittance being 87% or more.

Abstract: It is an object of the invention to provide a method for producing a modified polymer compound and a production apparatus of a modified polymer capable of producing a modified polymer compound with a high purity in a short time, and such a modified polymer compound. The invention provides a method for producing a modified polymer compound, which comprises chemically modifying a polymer compound in a supercritical fluid or a high temperature and high pressure fluid, said modified polymer compound being composed of monomer units obtainable by chemically modifying part of or all of monomer units composed of the polymer compound before modification reaction.

Abstract: This invention provides a method for producing a polymer alloy, a polymer alloy as well as a molded article, a transparent molded article and an optical film, which is obtainable by using the polymer alloy. The invention is a method for producing a polymer alloy, which comprises at least: a step 1 of mixing two or more resins incompatible with each other at ambient temperature and pressure with a solvent being in a liquid or gas state at ambient temperature and pressure; a step 2 of heating and applying pressure to said solvent into a high-temperature and high-pressure fluid or a supercritical fluid and mixing the solvent in this state; and, a step 3 of cooling the mixture obtained in said step 2 rapidly to the glass transition temperature or less without releasing the pressure of the mixture.