Toyo Boseki Kabushiki Kaisha

Tetsuma Kawakami

Kazuya Yoshimoto

Yukimi Yawata

Toru Wada

Keiichi Motoi

Yasuyuki Munekuni

The present invention aims to provide a flexographic printing original plate where, although it is a flexible aqueous developing plate, reproducibility of fine lines is good. A flexographic printing original plate which is a photosensitive printing original plate where at least (A) a supporting member, (B) a photosensitive resin layer, (C) a protective layer for preventing the polymerization inhibition due to oxygen in the photosensitive resin layer and (D) a heat-sensitive mask layer are successively layered, characterized in that, the photosensitive resin layer (B) is a layer which is able to be developed by water, Young's modulus of the protective layer (C) is 4 MPa to 35 MPa, layer thickness of the protective layer (C) is 0.2 &#x3bc;m to 2.0 &#x3bc;m and Young's modulus (MPa) and layer thickness (&#x3bc;m) of the protective layer (C) satisfy the following formula 1:1&#x2266;(Young's modulus)&#xd7;(Layer thickness)&#x2266;18&#x2003;&#x2003;(Formula 1).

Flexographic printing original plate

The present invention provides a photosensitive letterpress printing original plate provided with a heat sensitive mask layer having high light blocking effect and durability yet prepared as a thin film. A photosensitive letterpress printing original plate including at least (A) a supporting member, (B) a photosensitive resin layer, and (C) a heat sensitive mask layer that are successively laminated, wherein the heat sensitive mask layer (C) contains carbon black and, as a dispersion binder therefor, a butyral resin as well as polyamide containing polar group selected from the group consisting of polyamide containing a tertiary amine group, polyamide containing a quaternary ammonium salt group, polyamide containing an ether group and polyamide containing a sulfonic group.

Photosensitive letterpress printing original plate

The present invention provides a flexographic printing original plate having no wrinkle on the plate surface and having no plate surface abnormality due to laser in spite of the fact that it is a flexible water-developable plate. A photosensitive flexographic printing original plate developable by water in which at least a supporting member, a photosensitive resin layer, a protective layer and a heat-sensitive mask layer are successively laminated, characterized in that, the protective layer contains (A) polyvinyl alcohol, (B) plasticizer and (C) water-dispersible latex in the following rate.

The present invention provides a photosensitive flexographic printing original plate provided with a heat sensitive mask layer having high light blocking effect and durability yet prepared as a thin film. A photosensitive flexographic printing original plate including at least (A) a supporting member, (B) a photosensitive resin layer, (C) a protective layer and (D) a heat sensitive mask layer that are successively laminated, wherein the heat sensitive mask layer (D) contains carbon black and, as a dispersion binder therefor, a butyral resin as well as polyamide containing polar group selected from the group consisting of polyamide containing a tertiary amine group, polyamide containing a quaternary ammonium salt group, polyamide containing an ether group and polyamide containing a sulfonic group.

Growing community of inventors

Okayama, Japan

Tetsuma Kawakami