摘要:
Electrophotographic compositions containing zinc oxide dispersed in a certain resin binder mixture and sensitized with a cyanine dye having a particular structure provide high sensitivity in the 780-840 nm wavelength range, excellent thermal stability, long dark decay time and near-white appearance. The compositions are particularly useful for non-transfer electrophotography and for electrostatic printing applications.
摘要:
A process for preparing polyamides which comprises condensing an aromatic or aliphatic diamine and an aromatic or aliphatic diacid or an amino acid in the presence of one or more aryl phosphoryl azide compounds.
摘要:
A process for forming random copolymers which comprises forming a polymer melt containing one or more polyamides and one or more aryl phosphoryl azide compounds, such as diphenyl phosphoryl azide; and heating said melt for a period of time sufficient to form the desired amount of the copolymer.
摘要:
Process of detecting the presence of certain gases, including certain pollutants, in small concentrations; or to cause partial polymerization of certain polyacetylene compositions for use in time/temperature history indicators or radiation dosage indicators. The process involves contacting a reactive gas, such as a nitrogen oxide, a halide or ozone, with a crystalline substituted acetylenic monomer containing at least two conjugated triple bonds and substituents having at least one atom of oxygen or nitrogen. In particular the acetylenic compound is 2,4-hexadiyne-1,6-bis(phenylurethane) crystallized from tetrahydrofuran or acetone.
摘要:
An etchable electrophotographic printing plate comprising a coating on a surface of an electroconductive support such as grained, anodized aluminum of effective amounts of photoconductive ZnO and of a sensitizing dye dispersed in an organic resin binder comprised of about 60-90 wt. % of C.sub.2 -C.sub.4 alkenyl C.sub.2 -C.sub.8 alkanoate, about 5-30 wt. % of di(C.sub.1 -C.sub.8 alkyl) C.sub.4 -C.sub.8 alkenedionate, about 2-8 wt. % of C.sub.3 -C.sub.8 alkenoic acid or C.sub.4 -C.sub.8 alkenedioic acid, and about 0.5-5.0 wt. % of a cross-linking agent. The preferred thermally cross-linkable organic resin binder is a random copolymer of 70 wt. % vinyl acetate, 24 wt. % dibutyl maleate; 5 wt. % acrylic acid and 1 wt. % glycidyl methacrylate. The etchable printing plate of the present invention is environmentally safe, has excellent shelf life and high sensitivity to actinic radiation. A process of image-wise exposure of the etchable electrophotographic printing plate to a low-power laser combined with an environmentally-safe aqueous etchant to prepare a printing plate that provided 100,000 good quality impressions is also disclosed.
摘要:
This invention relates to a process for blow molding polyamide compositions where the molten polyamide includes an effective amount of one or more aryl phosphoryl azide compounds.
摘要:
A photoactivated time-temperature indicator is based on diacetylenic salts. A thermally unreactive ("inactive") diacetylenic salt (or a mixture of such salts) is mixed, in a polymeric matrix, with a material that generates acid upon exposure to light. Photoexcitation, preferably by UV or near UV light, causes the formation of a thermal reactive ("active") free diacetylenic acid. Following this activation step, a progressive color development occurs at a rate that increases with temperature. The indicator is useful for monitoring the freshness of perishable products, particularly those that require refrigeration.
摘要:
A process for preparing a co-poly(amide/peptide) by reacting polymeric or oligomeric polypeptides and polymeric or oligomeric polyamides in the presence of an effective amount of one or more aryl phosphoryl azide compounds.
摘要:
An activatable time-temperature indicator consists of an oxygen-sensitive reaction product of a triarylmethane dye and a decolorant that is coated on a substrate and covered by an oxygen barrier. Optinally, an oxygen-permeable layer is between the coating and the oxygen barrier. The indicator is activated by removing the oxygen barrier. Following this activation step, a progressive color development occurs at a rate that increases with temperature. The indicator is useful for monitoring the freshness of perishable products, particularly those stored at sub-ambient temperature.
摘要:
A kit and method for detecting lithium ions in a sample. The kit includes a lithium ion selective color indicator which is a leuco precursor of an arylmethane dye dispersed in a matrix. In use, the color indicator is contacted with a sample and any color change therein is monitored. A color change in the indicator indicates the presence of lithium ions in the sample.