摘要:
A PROCESS IS DESCRIBED FOR PREPARING SOLUBLE POLY(VINYL ESTERS) FROM POLY(VINYL ALCOHOL) AND HIGH MOLECULAR WEIGHT ACID CHLORIDES. THIS PROCEDURE IS ESPECIALLY USEFUL FOR PREPARING LIGHT-SENSITIVE POLYMERS.
摘要:
NOVEL LIGHT-SENSITIVE POLYMERS CONTAIN AS THE LIGHT-SENSITIVE MOIETY A SIDE CHAIN WHICH CONTAINS TOW ETHYLENICALLY UNSATURATED GROUPS CONJUGATED TO EACH OTHER THROUGH AN ARYLENE GROUP. PHOTOSENSITIVE COMPOSITIONS AND ELEMENTS PREPARED WITH THESE POLYMERS ARE USEFUL IN THE PREPARATION OF PHOTOMECHANICAL IMAGES SUCH AS PHOTORESISTS AND LITHOGRAPHIC PRINTING PLATES.
摘要:
PHOTOGRAPHIC ELEMENTS HAVING A SUPPORT COATED WITH A LIGHT-SENSITIVE LAYER INCLUDING A BLEACHING AGENT AND A DITHIOLIUM SALT WHICH, UPON EXPOSURE. THE SULFUR ATOMS OF THE DITHIOLIUM SALT NUCLEUS CAN HAVE EITHER A 1,2- OR A 1,3-RELATIONSHIP, AND ALL CARBON ATOMS IN THE NUCLEUS CAN BE SUBSTITUTED WITH SUCH GROUPS AS HYDROGEN ATOMS, ALKYL RADICALS, AMINO RADICALS, MONO- OR POLYCYCLIC ARYL RADICALS AND OXYGEN- OR SULFUR-CONTAINING HETEROCYCLIC RADICALS. ADDITIONALLY, THE DITHIOLIUM NUCLEUS CAN FORM PART OF A FUSED RING AROMATIC STRUCTURE IN WHICH ANY OR ALL OF THE RINGS CAN BE SUBSTITUTED WITH ANY OF THE ABOVE-NOTED SUBSTITUENTS. THE BLEACHING AGENT IS A COMPOUND HAVING A THIOCARBONYL GROUP SUCH AS A THIOUREA COMPOUND.