DAMPENING COMPOSITION FOR PLANOGRAPHIC PRINTING

PURPOSE:To provide an additive for dampening water capable of being replaced with isopropyl alcohol, by containing a hydrophylic polymer substance containing a carboxyl group and a hydroxyl group obtained by saponifying a copolymer prepared by copolymerizing acrylic acid and vinyl acetate. CONSTITUT...

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Bibliographische Detailangaben
1. Verfasser:	MAKINO KATSUAKI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS LINING MACHINES MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING,INKING, DAMPING, OR THE LIKE METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM PRINTING PRINTING PLATES OR FOILS STAMPS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	PURPOSE:To provide an additive for dampening water capable of being replaced with isopropyl alcohol, by containing a hydrophylic polymer substance containing a carboxyl group and a hydroxyl group obtained by saponifying a copolymer prepared by copolymerizing acrylic acid and vinyl acetate. CONSTITUTION:A hydrophylic polymer substance containing a carboxyl group and a hydroxyl group, which is obtained by saponifying a copolymer consisting of acrylic acid and vinyl acetate, is used. As the hydrophylic polymer substance wherein the carboxyl group (-COOH) and the hydroxyl group (-OH) are present in the same molecule, a copolymer of acrylic acid [CH2=CH(COOH)] and vinyl alcohol [CH=CH(OH)] is used. That is, -COOH is introduced from acrylic acid and OH is introduced from vinyl alcohol. The upper limit of the average polymerization degree of the polymer substance is determined by solubility to water and pref. about 5,000 and the lower limit thereof is pref. about 500 from the aspect of orientation property to the surface of a plate, that is, covering effect. The upper limit of a OH/COOH ratio is about 5(mol/mol) and the lower limit thereof is pref. 0.5(mol/mol).