Use of cover sheet and interposed flexible film with block copolymer composition
First Claim
Patent Images
1. A photosensitive element which comprises a sheet support;
- a layer of a photosensitive, elastomeric composition coated on said support having a thickness of from about 0.0005 to about 0.250 inch, said composition comprising(1) at least 30% by weight of at least one solvent-soluble, thermoplastic, elastomeric block copolymer containing at least two thermoplastic, nonelastomeric polymer blocks having a glass transition temperature above 25°
C. and an average molecular weight of 2000-100,000, and between said thermoplastic, nonelastomeric polymer blocks an elastomeric polymer block having a glass transition temperature below 10°
C. and an average molecular weight of about 25,000 to 1,000,000.(2) at least 1% by weight of an addition-polymerizable ethylenically unsaturated compound containing at least one terminal ethylenical group, and(3) a polymerization-effective amount of polymerization initiator activatable by actinic radiation;
a flexible cover sheet; and
a flexible, polymeric film interposed between said cover sheet and the surface of said layer.
1 Assignment
0 Petitions
Accused Products
Abstract
Photosensitive elements comprising a layer of a solvent-soluble, thermoplastic, elastomeric, block copolymer, a nongaseous ethylenically unsaturated compound, and an addition polymerization initiator activatable by actinic light interposed between a support and cover sheet, a flexible polymeric film, e.g., polyamide, being interposed between the cover sheet and the surface of the layer. The elements are useful in preparing printing plates, particularly flexographic printing plates, and other relief images.
188 Citations
8 Claims
-
1. A photosensitive element which comprises a sheet support;
- a layer of a photosensitive, elastomeric composition coated on said support having a thickness of from about 0.0005 to about 0.250 inch, said composition comprising
(1) at least 30% by weight of at least one solvent-soluble, thermoplastic, elastomeric block copolymer containing at least two thermoplastic, nonelastomeric polymer blocks having a glass transition temperature above 25°
C. and an average molecular weight of 2000-100,000, and between said thermoplastic, nonelastomeric polymer blocks an elastomeric polymer block having a glass transition temperature below 10°
C. and an average molecular weight of about 25,000 to 1,000,000.(2) at least 1% by weight of an addition-polymerizable ethylenically unsaturated compound containing at least one terminal ethylenical group, and (3) a polymerization-effective amount of polymerization initiator activatable by actinic radiation; a flexible cover sheet; and
a flexible, polymeric film interposed between said cover sheet and the surface of said layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- a layer of a photosensitive, elastomeric composition coated on said support having a thickness of from about 0.0005 to about 0.250 inch, said composition comprising
-
8. A photosensitive element which comprises a sheet support;
- a layer of a photosensitive, elastomeric composition coated on said support having a thickness of from about 0.0005 to about 0.250 inch, said composition comprising
(1) at least 30% by weight of at least one solvent-soluble, thermoplastic, elastomeric block copolymer containing at least two thermoplastic, nonelastomeric polymer blocks having a glass transition temperature above 25°
C. and an average molecular weight of 2000-100,000, and between said thermoplastic, nonelastomeric polymer blocks an elastomeric polymer block having a glass transition temperature below 10°
C. and an average molecular weight of about 25,000 to 1,000,000.(2) at least 1% by weight of an addition-polymerizable ethylenically unsaturated compound containing two terminal ethylenic groups, and (3) a polymerization-effective amount of polymerization initiator activatable by actinic radiation; a flexible cover sheet; and
a flexible, polymeric film interposed between said cover sheet and the surface of said layer.
- a layer of a photosensitive, elastomeric composition coated on said support having a thickness of from about 0.0005 to about 0.250 inch, said composition comprising
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeE. I. du Pont de Nemours and Company (Corteva, Inc.)
-
Original AssigneeE. I. du Pont de Nemours and Company (Corteva, Inc.)
-
InventorsBrennan, James F., Chen, Gwendyline Y. Y. T.
-
Primary Examiner(s)BRAMMER, JACK
-
Application NumberUS06/222,713Time in Patent Office456 DaysField of Search430/271, 430/273, 430/281, 430/288, 430/905, 204/159.14, 204/159.18US Class Current430/271.1CPC Class CodesG03F 7/032 with bindersG03F 7/033 the binders being polymers ...Y10S 430/106 Binder containing
