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: 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 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: Microfiber webs comprising at least one cycloolefin polymer are produced by melt-blowing.

Abstract: The present invention describes a novel transparent polymer mixture with modified relaxation behavior and modified shrinkage behavior, comprising cycloolefin polymers. The polymer mixture comprises at least one amorphous polyolefin. The polymer mixture is used to produce mono- or biaxially oriented films, blister packs, or mixtures with other plastics, particularly with polyolefins. The polymer mixture is used in injection molding, injection blow molding or blow extrusion.

Abstract: The present invention relates to a thermoformable composite film, a process for producing a thermoformable composite film, the use of a solvent-free adhesive for applying a thermoplastic film to a film comprising cycloolefin copolymer in order to produce a thermoformable composite film, an extrusion coated film and a process for producing an extrusion coated film and use of the film as a packaging material.

Abstract: The present invention describes a novel transparent polymer mixture with modified relaxation behavior and modified shrinkage behavior, comprising cycloolefin polymers. The polymer mixture comprises at least one amorphous polyolefin. The polymer mixture is used to produce mono- or biaxially oriented films, blister packs, or mixtures with other plastics, particularly with polyolefins. The polymer mixture is used in injection molding, injection blow molding or blow extrusion.

Abstract: Polymer alloy comprising a) one or more cycloolefin copolymers and b) one or more types of core/shell particles.

Abstract: The present invention relates to a polymer composition comprising one or more cycloolefin copolymers and one or more suitably formulated additives, having improved resistance to stress cracking in air or else in contact with media which give rise to stress cracking.

Abstract: This invention relates to a process for metalizing polyolefin film in which at least one outermost layer of the unmetalized polyolefin film has at least about 90% cycloolefin polymer that has not been subjected to a process for increasing surface tension before metalization. The metalized films are useful as dielectrics in capacitors.

Abstract: Electrets can be produced from cycloolefin copolymers (COCs), and charges applied thereto are stable for long periods, even at high temperatures and high relative humidities. The reduction here in a positive charge applied to the COCs is smaller than that of negative charges applied to the COCs. The stability over time of the charges applied is impaired by adding polar additives, such as inorganic silicon compounds. Films, fibers or nonwovens produced from electrets can be processed to give filters.

Abstract: The present invention relates to a mono- or multilayer film, where the film consists of a cycloolefin copolymer or mixtures of cycloolefin copolymers and one or more thermoplastics, and where, at 85% relative humidity and a temperature of about 23° C., the film has a water vapor permeation of ≦0.035 g*mm/m2d, a puncture resistance of ≦300 N/mm and a thickness of ≦100 &mgr;m.

Abstract: The present invention relates to a thermoformable composite film comprising at least one film which comprises cycloolefin copolymer and comprising, laminated to at least one side of this film, a thermoplastic film. The thermoformable film is obtainable by using a solvent-free single-component adhesive to apply the thermoplastic film laminated to the film which comprises cycloolefin copolymer. The film which is laminated is a PVDC-containing thermoplastic film. The thickness of the entire film is from 100 to 500 &mgr;m, the thickness of PVDC film is from 5 to 150 &mgr;m and the thickness of the COC film is from 50 to 400 &mgr;m. The thermoformable composite film is used to produce blister packs.

Abstract: The present invention relates to foams comprising cycloolefin copolymers. The foam of the invention comprises at least one cycloolefin copolymer which comprises from 0.1 to 100% by weight, based on the total mass of the cycloolefin copolymer, of polymerized units derived from one or more polycyclic olefins having one or more norbornene units and from 0 to 99% by weight, based on the total mass of the cycloolefin copolymer, of polymerized units derived from one or more acyclic olefins of the formula  where Ri, Rii, Riii and Riv are identical or different and are each a hydrogen atom, a linear, branched, saturated or unsaturated C1-C20-hydrocarbon radical or a C6-C18-aryl radical and from 0 to 99% by weight, based on the total mass of the cycloolefin copolymer, of polymerized units of one or more monocyclic olefins of the formula VIII  where n is a number from 2 to 10, and voids which can contain one or more gaseous substances.

Abstract: The present invention relates to a polymer blend comprising one or more cycloolefin copolymers and one or more types of core-shell particles or one or more copolymers which are composed to some extent of rubbers with low glass transition temperatures, or a combination of one or more types of core-shell particles and of one or more copolymers which are composed to some extent of rubbers with low glass transition temperatures.

Abstract: The invention relates to a film having more than one layer and made from cycloolefin polymers and having a base layer and at least one outer layer, the base layer being built up essentially from a cycloolefin polymer COP having a glass transition temperature Tg and the outer layer being built up essentially from a mixture of cycloolefin polymers, wherein the mixture of cycloolefin polymers comprises at least two cycloolefin polymers COP.sub.1 and COP.sub.2 whose glass transition temperatures Tg.sub.1 and Tg.sub.2 differ by at least 5.degree. C., where Tg.sub.2 -Tg.sub.1 .gtoreq.5.degree. C. and at the same time the condition Tg.sub.2 -Tg.gtoreq.5.degree. C. is fulfilled.

Abstract: Polymer alloy comprising a) one or more cycloolefin copolymers and b) one or more types of core/shell particles having a diameter of 0.01 to 0.7 micrometer.

Abstract: The present invention relates to a cycloolefin polymer having a solution viscosity <0.25 dl/g, comprising polymerized units of at least one cycloolefin and, if desired, polymerized units of one or more acyclic olefins, wherein the cycloolefin polymer has at one or both ends an olefinically unsaturated group having at least 3 carbon atoms.

Abstract: The present invention relates to a cycloolefin polymer having a solution viscosity >0.25 dl/g and containing polymerized units of at least one cycloolefin and, if desired, polymerized units of one or more acyclic olefins, wherein the cycloolefin polymer has at one or both ends an olefinically unsaturated group having at least 3 carbon atoms.

Abstract: The present invention relates to a cycloolefin polymer having a solution viscosity >0.25 dl/g and containing polymerized units of at least one cycloolefin and, if desired, polymerized units of one or more acyclic olefins, wherein the cycloolefin polymer has at one or both ends an olefinically unsaturated group having at least 3 carbon atoms.