Abstract: A water processable photopolymer composition for use in the manufacture of flexographic photopolymer printing plates is disclosed. The composition includes a flexible polymer having an affinity for water combined with a combination of hydrophilic and hydrophobic ethylenically unsaturated crosslinking agents or a single crosslinking agent containing both groups, a photoinitiator and swell enhancing components.

Abstract: A gas chromatograph measures the gas concentration levels of fault gases contained in the gas within a headspace above the electrical insulating oil supply contained in a power transformer. An on-line fault detection system involves gas samples taken from transformers at a utility site in sequence with automatically controlled timer valves which open to draw a gas sample from each transformer headspace and then transfer the gas directly to a single gas chromatograph. The gas chromatograph includes an integrator which calculates the concentration level of each fault gas in the gas sample. The resulting fault gas data are fed to a computer programmed with a partition function based on Henry's Law to convert the headspace fault gas data to fault gas concentration levels within the transformer oil.

Abstract: The invention involves a photosensitive composition and a printing element made from the photosensitive composition as well as a method of making the printing element. The photosensitive composition is made from a blend of a crosslinking photoinitiator with an asymmetric, multi-branched, block copolymer containing (a) a polymer block A having at least predominantly a polymerized alkenyl arene block, (b) a polymer block B having at least predominantly a polymerized conjugated diene block, (c) a polymer block C having at least predominantly a polymerized conjugated diene block, and (d) the residue of a multifunctional coupling agent. Block A and block B form the structure A-B and the multifunctional coupling agent is between at least one block C and the block B of at least one A-B. The photosensitive composition may optionally include an ethylenically unsaturated crosslinking agent.

Abstract: The invention relates to the use of effective amounts of UV absorbers in a thermoplastic, elastomeric, composition layer of a photosensitive printing element, wherein said layer comprises a thermoplastic, elastomeric, asymmetric, star-shaped block copolymer, to produce enhanced exposure latitude, as well as a method of producing a printing plate with the printing element. The UV absorbers most likely act as internal scavengers of scattered UV light and thereby enhance the exposure latitude of the printing element. The invention also relates to the photosensitive composition of the element.

Abstract: A photosensitive elastomeric composition which comprises a high molecular weight elastomeric diene polymer having a number average molecular weight (Mn) of about 30,000 to 125,000, and a Mooney viscosity (ML-4 at 100.degree. C.) of 35 or higher; a low molecular weight diene polymer having a number average molecular weight of about 1,000 to 25,000; a photopolymerizable, ethylenically unsaturated cross-linking agent; and an addition polymerization initiator activatable by actinic radiation.

Abstract: A photopolymer elastomeric article designed to be used primarily in a flexographic printing system comprising: a polymer matrix made up of a mixture of syndiotactic 1,2-polybutadiene and cis-1,4-polyisoprene; a photoinitiator, which is a compound, which when irradiated, will initiate polymerization and/or crosslinking; and optionally, 0-3 phr of photopolymerizable, ethylenically unsaturated crosslinking agent, as typified by esters of acrylic or methacrylic acid.

Abstract: An elastomeric article suitable for flexographic printing comprising an elastomeric natural or synthetic dienoid polymer or copolymer, a photopolymerizable, ethylenically unsaturated crosslinking agent and a photoinitiator, portions of said article having been exposed to a photopolymerizable-effective amount of actinic radiation through an image bearing transparency having clear and opaque areas, and processed to remove the soluble portion of said plate situated beneath the opaque areas of the transparency during exposure, and said processed plate having been treated with iodine so as to render its printing surface tack-free and resistant to hardening when further exposed to actinic radiation.

Abstract: A photopolymer elastomeric article designed to be used primarily in a flexographic printing system comprising three constituents: a chlorosulfonated polyethylene polymer matrix, a photopolymerizable, ethylenically unsaturated crosslinking agent, as typified by esters of acrylic or methacrylic acid and a photoinitiator, which is a compound, which when irradiated, will initiate polymerization and/or crosslinking.

Abstract: A pneumatic tire of the tubeless type, embodying a layer of puncture sealant composition based on:A. a major proportion of a low molecular weight elastomer (e.g., depolymerized natural rubber) in admixture with a tackifying or plasticizing substance (e.g., a resinous reaction product of a mineral oil purification residue with formaldehyde) andB. a minor proportion of a high molecular weight elastomer (e.g., cis-polyisoprene);Containing a crosslinking agent (e.g., tetra-n-butyl titanate) in an amount sufficient to give a partial cure.

Abstract: A pneumatic tire of the tubeless type, embodying a layer of puncture sealant composition based on a major proportion of low molecular weight liquid elastomer with a minor proportion of a high molecular weight elastomer, containing a crosslinking agent in an amount sufficient to give a partial cure. An example of the composition of the invention is a blend of 60 parts of depolymerized natural rubber and 40 parts of cis-polyisoprene, partially crosslinked by the action of 6 parts of tetra-n-butyl titanate so as to provide a gel content of about 40%.

Abstract: A composition comprising thermoplastic copolymers of styrene or substituted styrene with acrylonitrile or substituted acrylonitriles or acrylonitrile-butadiene-styrene polymers in admixture with a combination of a discontinuous glass fiber and a particulate filler.