摘要:
A composition for finishing, preserving and cleaning lithographic printing plates which is composed of a polyol having a molecular weight in the range of from about 50 to about 3,000; a starch or dextrin hydrophilic film former; an alkyl benzene sulfonate amine salt; a composition of hydrocarbons containing less than about 10% aromatics and having a boiling point in the range of 175.degree. F. to 500.degree. F. and a flash point of above 100.degree. F.; a hydrogen, isooctyl, nonyl, decy or dodecyl substituted phenoxypoly(oxyethylene) ethanol surfactant having an HLB of 8 to 15; a C.sub.12 to C.sub.20 alcohol; mono-, di- or tri- ethanolamine; an organic or inorganic acid and water. The optional inclusion of a buffer salt and bacteriostat is preferred.
摘要:
Provided herein is a brushgraining process to improve the quality of lithographic printing plate substrate surfaces. In the process, the surface is brushed in an aqueous slurry comprising a mixture of particulates of alumina and quartz in a weight ratio range 95:5 to 5:95, with the particulates being in the size range of 1-20 microns. Such a process surprisingly lessens the number of scratches produced on the substrate surface than when compared to using alumina alone or quartz alone or a mixture of alumina and quartz with particle sizes higher than the range disclosed.
摘要:
This invention relates to a radiation polymerizable composition for use in a phtographic element such as a lithographic printing plate comprising in admixturea) a binder resin having the general formula--A--B--C-- wherein a plurality of each of components A, B and C occur in ordered or random sequence in the resin and wherein A is present in said resin at about 5% to about 20% by weight and comprises groups of the formula ##STR1## B is present in said resin at about 4% to about 30% by weight and comprises groups of the formula ##STR2## and C is present in said resin at about 50% to about 91% by weight and comprises acetal groups consisting of groups of the formulae ##STR3## where R is lower alkyl or hydrogen, and wherein said group I is present in component C from about 75% to about 85%, group II is present in component C from about 3% to about 5%; and group III is present in component C from about 10% to about 22%;b) a photoinitiator; andc) a photopolymerizable mixture ofi) a polyfunctional acrylic monomer having two or more unsaturated groups;ii) a monofunctional acrylic monomer having 1 unsaturated group.
摘要:
This invention relates to a radiation polymerizable composition for use in a photographic element such as a lithographic printing plate comprising in admixture(a) a binder resin having the general formula--A--B--C-- wherein a plurality of each of components A, B and C occur in ordered or random sequence in the resin and wherein A is present in said resin at about 5% to about 20% by weight and comprises groups of the formula ##STR1## B is present in said resin at about 4% to about 30% by weight and comprises groups of the formula ##STR2## and C is present in said resin at about 50% to about 91% by weight and comprises acetal groups consisting of groups of the formulae ##STR3## where R is lower alkyl or hydrogen, and wherein said group I is present in component C from about 75% to about 85%, group II is present in component C from about 3% to about 5%; and group III is present in component C from about 10% to about 22%.(b) a photoinitiator;(c) a diazonium salt; and(d) a photopolymerizable mixture of(i) an acrylic monomer having two or more unsaturated groups; and(ii) an oligomer which is prepared by reacting one molar equivalent of a substantially linear polymeric compound having an active hydrogen group at each end thereof with a least two molar equivalents of a diisocyanate compound so as to form a prepolymer having an isocyanate group at each end thereof; and subsequently reacting said prepolymer with at least two equivalents of an ethylenically unsaturated compound having an active hydrogen group to provide said prepolymer with unsaturation at each end thereof.
摘要:
The present invention relates to supports for lithographic printing plates and to a process for producing the same. In particular, the invention relates to aluminum plates having an electrochemically grained and anodized surface which is has a smooth, shiny surface and hence greater image contrast when a lithographic image is formed thereon. The surface has a substantially uniform surface topography comprising peaks and valleys and surface roughness parameters wherein Ra ranges from about 0.10 to about 0.50 microns, Rz ranges from about 0.00 to about 5.00 microns, Rt ranges from about 0.00 to about 6.00 microns and Rp ranges from about 0.00 to about 4.00 microns. The surface preferably has tristimulus color coordinate values wherein L ranges from about 35.00 to about 75.00, a ranges from about -4.00 to about +4.00 and b ranges from about -4.00 to about +4.00.
摘要:
This invention relates to a radiation polymerizable composition for use in a photographic element such as a lithographic printing plate comprising in admixture(a) a binder resin having the general formula--A--B--C-- wherein a plurality of each of components A, B and C occur in ordered or random sequence in the resin and wherein A is present in said resin at about 5% to about 20% by weight and comprises groups of the formula ##STR1## B is present in said resin at about 4% to about 30% by weight and comprises groups of the formula ##STR2## and C is present in said resin at about 50% to about 91% by weight and comprises acetal groups consisting of groups of the formulae ##STR3## where R is lower alkyl or hydrogen, and wherein said group I is present in component C from about 75% to about 85%, group II is present in component C from about 3% to about 5%; and group III is present in component C from about 10% to about 22%.(b) a photoinitiator;(c) a diazonium salt; and(d) a photopolymerizable mixture of(i) an acrylic monomer having two or more unsaturated groups; and(ii) an oligomer which is prepared by reacting one molar equivalent of a substantially linear polymeric compound having an active hydrogen group at each end thereof with at least two molar equivalents of a diisocyanate compound so as to form a prepolymer having an isocyanate group at each end thereof; and subsequently reacting said prepolymer with at least two equivalents of an ethylenically unsaturated compound having an active hydrogen group to provide said prepolymer with unsaturation at each end thereof.
摘要:
This invention relates to light sensitive water soluble diazonium compound condensation products stabilized against degradation caused by heat and/or prolonged storage employing selected amino acids as stabilizers. The invention also relates to presensitized reproduction materials comprising the amino acid stabilized water soluble diazonium compound condensation products.
摘要:
A photographic element comprising a transparent support and a coating on the support comprising a diazonium composition having a light absorbency of about 45% or less, and a colorant composition, said coating having a light transmission of not more than about 0.1%.
摘要:
A color ant dispersion having a pigment, a solvent composition of a C1-C8 aliphatic alcohol, a mono- or di-C1-C8 alkylene glycol C1-C8 alkyl ether, or a cyclic ketone; and an aqueous alkaline soluble or swellable polymeric compound which is the reaction product of a hydroxy containing polymer and an anhydride in the presence of a catalytic amount of a tertiary amine catalyst. The pigment and the polymeric compound are present in a high relative weight ratio of from about 0.75:1.25 to about 1.25:0.75. An admixture of the dispersion, a light sensitive component diazonium compound or photopolymerizable composition and an aqueous alkaline soluble or swellable polymeric binder, when coated and dried onto a substrate, forms a photographic element, which when imagewise exposed and developed has an exceptionally high contrast between image and removed non-image areas.
摘要:
A process for the production of photographic images utilizing a photographic element comprising a transparent support and a coating on the support comprising a diazonium composition having a light absorbency of about 45% or less, and a colorant composition, said coating having a light transmission of not more than about 0.1%.