Photoresin printing plate for use in printing a corrugated board
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsShohei Nakamura, Kuniaki Minonishi
Life of this patent
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Abstract
A photoresin printing plate having a Shore A hardness at 20.degree. C. of 25 to 60, an impact resilience at 20.degree. C. of 35% or more as measured by a falling ball method and a surface tack at 20.degree. C. of 40 g/cm or less has been found not only to be capable of providing prints having an image of high precision but also to be capable of releasing the paper dust or the like, which has adhered to the printing plate, in a short period of time during the printing operation, so that it did not become necessary to interrupt the printing operation in order to clean the printing plate, which leads to an efficient production of the prints.
Claims21
A photoresin printing plate for use in printing a corrugated board, having a Shore A hardness at 20.degree. C. of 25 to 60, an impact resilience at 20.degree. C. of 35% or more as measured by a falling ball method and a surface tack at 20.degree. C. of 40 g/cm or less, said printing plate being prepared by providing a photosensitive resin layer of a liquid photosensitive resin composition on a substrate and subjecting the layer to image-wise exposure to actinic radiation, followed by the development thereof, wherein said liquid photosensitive resin composition comprises (A) an unsaturated polyurethane prepolymer, (B) an ethylenically unsaturated compound and (C) a photopolymerization initiator,
- said unsaturated polyurethane prepolymer being obtained by the reaction of a diol having a number average molecular weight of 700 to 5,000 with a compound having at least two isocyanate groups and a compound containing in the molecule thereof at least one functional group having an active hydrogen atom and at least one ethylenically unsaturated double bond,
- said diol consisting of a polyether diol comprising at least 20% by weight, based on the total weight of the polyether diol, of polytetramethylene glycol.
A method for printing a corrugate board, which comprises printing a corrugate board by means of a photoresin printing plate having a Shore A hardness at 20.degree. C. of 25 to 60, an impact resilience at 20.degree. C. of 35% or more as measured by a falling ball method and a surface tack at 20.degree. C. of 40 g/cm or less, said printing plate being prepared by providing a photosensitive resin layer of a liquid photosensitive resin composition on a substrate and subjecting the layer to image-wise exposure to actinic radiation, followed by the development thereof, wherein said liquid photosensitive resin composition comprises (A) an unsaturated polyurethane prepolymer, (B) an ethylenically unsaturated compound and (C) a photopolymerization initiator,
- said unsaturated polyurethane prepolymer being obtained by the reaction of a diol having a number average molecular weight of 700 to 5,000 with a compound having at least two isocyanate groups and a compound containing in the molecule thereof at least one functional group having an active hydrogen atom and at least one ethylenically unsaturated double bond,
- said diol consisting of a polyether diol comprising at least 20% by weight, based on the total weight of the polyether diol, of polytetramethylene glycol.
A method for printing a corrugated board, which comprises printing a corrugated board by means of a photoresin printing plate having a Shore A hardness at 20.degree. C. of 25 to 60, an impact resilience at 20.degree. C. of 35% or more as measured by a falling ball method and a surface tack at 20.degree. C. of 40 g/cm or less, said printing plate being prepared by providing a photosensitive resin layer of a liquid photosensitive resin composition on a substrate and subjecting the layer to image-wise exposure to actinic radiation, followed by the development thereof, wherein said liquid photosensitive resin composition comprises (A) an unsaturated polyurethane prepolymer, (B) an ethylenically unsaturated compound and (C) a photopolymerization initiator,
- said unsaturated polyurethane prepolymer being obtained by the reaction of a diol having a number average molecular weight of 700 to 5,000 with a compound having at least two isocyanate groups and a compound containing in the molecule thereof at least one functional group having an active hydrogen atom and at least one ethylenically unsaturated double bond,
- said diol consisting essentially of a polyether diol comprising at least 20% by weight, based on the total weight of the polyether diol, of polytetramethylene glycol having a molecular weight 700-5,000.
A photoresin printing plate for use in printing a corrugated board, having a Shore A hardness at 20.degree. C. of 25 to 60, an impact resilience at 20.degree. C. of 35% or more as measured by a falling ball method and a surface tack at 20.degree. C. of 40 g/cm or less, said printing plate being prepared by providing a photosensitive resin layer of a liquid photosensitive resin composition on a substrate and subjecting the layer to image-wise exposure to actinic radiation, followed by the development thereof, wherein said liquid photosensitive resin composition comprises (A) an unsaturated polyurethane prepolymer, (B) an ethylenically unsaturated compound and (C) a photopolymerization initiator,
- said unsaturated polyurethane prepolymer being obtained by the reaction of a diol having a number average molecular weight of 700 to 5,000 with a compound having at least two isocyanate groups and a compound containing in the molecule thereof at least one functional group having an active hydrogen atom and at least one ethylenically unsaturated double bond,
- said diol comprising at least 20% by weight, based on the total weight of the diol, of polytetramethylene glycol having a molecular weight of 700 to 5,000.
A photoresin printing plate for use in printing a corrugated board, having a Shore A hardness at 20.degree. C. of 25 to 60, an impact resilience at 20.degree. C. of 35% or more as measured by a falling ball method and a surface tack at 20.degree. C. of 40 g/cm or less, said printing plate being prepared by providing a photosensitive resin layer of a liquid photosensitive resin composition on a substrate and subjecting the layer to image-wise exposure to actinic radiation, followed by the development thereof, wherein said liquid photosensitive resin composition consists essentially of (A) an unsaturated polyurethane prepolymer, (B) an ethylenically unsaturated compound and (C) a photopolymerization initiator,
- said unsaturated polyurethane prepolymer being obtained by the reaction of a diol having a number average molecular weight of 700 to 5,000 with a compound having at least two isocyanate groups and a compound containing in the molecule thereof at least one functional group having an active hydrogen atom and at least one ethylenically unsaturated double bond,
- said diol comprising at least 20% by weight, based on the total weight of the diol, of polytetramethylene glycol having a molecular weight of 700 to 5,000.
Dependencies are inferred from the claim text.