Photosensitive element having an overcoat which increases photo-

Details Photosensitive element having an overcoat which increases photo- Photosensitive element having an overcoat which increases photo-

1996-08-15

1998-07-28

Hamilton, Cynthia

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

G03F 711

Patent

active

057861277

ABSTRACT:
This invention relates to a novel photosensitive element comprising: a support having a surface; a photosensitive layer on the surface; and a transparent, protective coating on the photosensitive layer. The photosensitive layer comprises a composition of an ethylenically unsaturated compound and a photo-initiator, and is capable of photo-initiated addition polymerization. The PVA-based protective coating is substantially impermeable to atmospheric oxygen. In accordance with this invention, it has been discovered that photo-speed in a photosensitive element is substantially enhanced if this coating contains a acid, and especially if the coating exhibits an acidic pH, preferably less than about 5.5. The protective coating preferably also contains a second polymer which imparts surface hardness and scratch resistance to the protective coating. The coating may further contain a plasticizer to impart flexibility and inhibit cracking and snow-flaking.

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