Abstract: The invention relates to a melter, comprising a block (2) having a detachable shell (6), in which there is housed a melting chamber (3) provided with an upper opening that is closed with a hinged and detachable lid (11), the chamber (3) being arranged on lower supports (7), with the freedom to expand upwards, the opening of said chamber (3) incorporating a gasket (8) having an upwardly inclined flexible lip in the outer part on which the shell (6) rests, establishing sealed closure with respect to the chamber (3), whereas on the gasket (8) there is arranged a frame (9) having an upward vertical flange, with respect to which the lid (11) that closes on the gasket (8) is assembled, such that when the chamber (3) expands due to the temperature, the flexible lip allows the expansion maintaining leak-tightness.

Abstract: The invention relates to a melter, comprising a block (2) having a detachable shell (6), in which there is housed a melting chamber (3) provided with an upper opening that is closed with a hinged and detachable lid (11), the chamber (3) being arranged on lower supports (7), with the freedom to expand upwards, the opening of said chamber (3) incorporating a gasket (8) having an upwardly inclined flexible lip in the outer part on which the shell (6) rests, establishing sealed closure with respect to the chamber (3), whereas on the gasket (8) there is arranged a frame (9) having an upward vertical flange, with respect to which the lid (11) that closes on the gasket (8) is assembled, such that when the chamber (3) expands due to the temperature, the flexible lip allows the expansion maintaining leak-tightness.

Abstract: 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 ha

Abstract: 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 polymeric binder;(b) a photoinitiator;(c) a diazonium salt; and(d) a photopolymerizable mixture of(i) a polyfunctional acrylic monomer having from 3 to 6 unsaturated groups; and(ii) a monofunctional acrylic monomer having 1 unsaturated group.

Abstract: 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; and(c) an acrylic monomer having one or more unsaturated groups.

Abstract: This invention relates to a radiation polymerizable composition for use in a photographic element such as a lithographic printing plate comprising in admixturea) a polymeric binder;b) a photoinitiator;c) a diazonium salt; andd) a photopolymerizable mixture ofi) a polyfunctional acrylic monomer having from 3 to 6 unsaturated groups; andii) a monofunctional acrylic monomer having 1 unsaturated group.

Abstract: 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; and(c) an acrylic monomer having one or more unsaturated groups.

Abstract: 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%.

Abstract: 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%.