Abstract: Clean running printing plates for flexographic printing may be prepared by the co-photopolymerization of a mixture comprising a liquid, acrylate or methacrylate-terminated polyurethane oligomer, an ethylenically unsaturated compound, and a photopolymerization initiator. The liquid oligomer is preferably the acrylated or methacrylated reaction product of a diisocyanate, a liquid hydrophobic polyalkylene oxide, and a diol that is at least one of polypropylene oxide and a copolymer of ethylene oxide and propylene oxide, where reaction with a hydroxy-containing acrylate or methacrylate compound incorporates terminal acrylate or methacrylate groups into the oligomer. The photopolymerizable blend may be used to form printing plates for flexographic printing, where the plates have a reduced tendency to pick up paper fibers, dust and dried ink during the printing process. Methodology for preparing the printing plates, and printing with the printing plates of the invention is also provided.

Abstract: Clean running printing plates for flexographic printing may be prepared by the co-photopolymerization of a mixture comprising a liquid, acrylate or methacrylate-terminated polyurethane oligomer, an ethylenically unsaturated compound, and a photopolymerization initiator. The liquid oligomer is preferably the acrylated or methacrylated reaction product of a diisocyanate, a liquid hydrophobic polyalkylene oxide, and a diol that is at least one of polypropylene oxide and a copolymer of ethylene oxide and propylene oxide, where reaction with a hydroxy-containing acrylate or methacrylate compound incorporates terminal acrylate or methacrylate groups into the oligomer. The photopolymerizable blend may be used to form printing plates for flexographic printing, where the plates have a reduced tendency to pick up paper fibers, dust and dried ink during the printing process. Methodology for preparing the printing plates, and printing with the printing plates of the invention is also provided.

Abstract: A photosensitive resin composition includes a urethane oligomer prepared from a hydroxy-functionalized acrylate and/or methacrylate, at least one diol, and 2,4-toluene diisocyanate and 2,6-toluene diisocyanate in a 65:35 weight ratio. The resin composition additionally contains a monomer having at least one acrylate or methacrylate group, and a photoreactive initiator. The photosensitive resin composition may be cured to provide a soft photopolymer printing plate, particularly well suited for printing on corrugated bard.

Abstract: A composition and method for polymerization of cycloolefins using a feed stream including an iodide containing activator to form a substantially cross-linked polymeric product. The polymeric product may be formed by polymerization in an intricately shaped mold and/or be of ultra-low density. High glass transition temperature and fiber reinforced products are formed.

Abstract: A composition and method for polymerization of cycloolefins using a feed stream including dialkylaluminum iodide and the cross-linked polymer produced. The polymer product may be formed by polymerization in an intricately shaped mold and/or be of ultra-low density. A trialkylaluminum compound or a dialkylaluminum chloride are preferably included with dialkylaluminum iodide.

Abstract: Disclosed is an improved method of making a cellular crosslinked polymer with a metathesis-catalyst system where a metathesis-catalyst is activated with an alkylaluminum iodide compound.In a preferred embodiment, two parts of the metathesis-catalyst system form the basis for two solutions, a catalyst/monomer solution and an alkylaluminum iodide activator/monomer solution. At least one solution also contains a blowing agent. The solutions are combined in one place, such as the mixing head of a reaction injection molding machine, and then injected into another place, such as a mold, where the monomer reacts to form a cellular crosslinked polymer.

Abstract: Disclosed is an improved method of making a cellular crosslinked polymer with a metathesis-catalyst system where a metathesis-catalyst is activated with an alkylaluminum iodide compound.In a preferred embodiment, two parts of the metathesis-catalyst system form the basis for two solutions, a catalyst/monomer solution and an alkylaluminum iodide activator/monomer solution. At least one solution also contains a blowing agent. The solutions are combined in one place, such as the mixing head of a reaction injection molding machine, and then injected into another place, such as a mold, where the monomer reacts to form a cellular crosslinked polymer.