DR. JOHN WESLEY HARDIN, M.D.
Student, Health Care at Deaconess Rd, Boston, MA

5516620, May 14, 1996

Nov 1, 1993

8/146710

Chieh-Min Cheng - Arlington MA
Anthony C. Giudice - Wakefield MA
John M. Hardin - Jamaica Plain MA
Leonard C. Wan - Chestnut Hill MA

Polaroid Corporation - Cambridge MA

G03C 172

430138

A lithographic printing plate for use on a printing press, with minimal or no additional processing after exposure to actinic radiation, comprises a printing plate substrate, a polymeric resist layer capable of imagewise photodegradation or photohardening, and a plurality of microencapsulated developers capable of blanket-wise promoting the washing out of either exposed or unexposed areas of the polymeric resist. The microencapsulated developers may be integrated into the polymeric resist layer, or may form a separate layer deposited atop the polymeric resist layer, or may be coated onto a separate sheet support capable of being brought into face-to-face contact with conventional printing plates.

5607816, Mar 4, 1997

Sep 21, 1995

8/531853

Maurice J. Fitzgerald - Canton MA
John M. Hardin - Jamaica Plain MA
Frederick R. Kearney - Walpole MA

Polaroid Corporation - Cambridge MA

G03F 730

4302711

Described is the use of a plasticizing-permeation enhancing additive in negative-working, on-press developable lithographic printing plates. Briefly, a plasticizer, which is dispersible or soluble in press fountain and ink solutions and soluble in acrylic monomers and oligomers, are incorporated into a plate's photoresist at concentrations sufficient to enhance said resist's permeability to or diffusion by press solutions. Such additives make the photoresist more permeable to fountain solution prior to crosslinking, while being easily extracted with ink and fountain solution after crosslinking. In certain embodiments, a surfactant is added to facilitate the dispersion of hydrophobic remnants of removed resist material in the fountain solution, and thereby reduce scumming. Lithium salts may also be incorporated into the photoresist to disrupt hydrogen bonding of, for example, urethane acrylate polymers which tend to associate by hydrogen bonding.

5561029, Oct 1, 1996

Apr 28, 1995

8/430461

Maurice J. Fitzgerald - Canton MA
Frederick R. Kearney - Walpole MA
William C. Schwarzel - Billerica MA
Donna J. Guarrera - Norwood MA
John M. Hardin - Jamaica Plain MA
John C. Warner - Norwood MA

Polaroid Corporation - Cambridge MA

G03F 7031

4302811

The present invention sets forth the incorporation of a substituted 2-phenyl-4,6-bis (trichloromethyl)-1,3,5-triazine in photoresists of lithographic printing plates for the purpose of promoting their shelf-life, room light stability, and developability. The present invention provides a photocurable composition comprising at least a photopolymerizable ethylenically unsaturated monomer having at least one terminal ethylenic group and capable of forming a polymer upon exposure to actinic radiation; and an s-triazine capable of initiating free radical polymerization of the photopolymerizable ethylenically unsaturated monomer and being represented by the following general formula [I]: ##STR1## wherein R. sub. 1 is either OR. sub. 4 or NR. sub. 5 R. sub. 6, wherein R. sub. 5 and R. sub.

5997993, Dec 7, 1999

Nov 20, 1997

8/975279

Daoshen Bi - Burlington MA
John M. Hardin - Jamaica Plain MA

Polaroid Corporation - Cambridge MA

B32B 300

428195

The present invention provides a lithographic printing plate precursor element capable of being used on a printing press immediately after imagewise exposure without the requirement of bath processing. A preferred embodiment has in order (a) a substrate; and (b) a photoresist photohardenable upon imagewise exposure to actinic radiation, the photoresist comprising (i) a macromolecular organic binder; (ii) a photopolymerizable ethylenically unsaturated monomer having at least one terminal ethylenic group capable of forming a high polymer by chain-propagated polymerization, and (iii) a polymerization initiator activatable by actinic radiation; and (c) an on-press removable polyphosphate-containing overcoat. The polyphosphate-containing overcoat imparts the plate with a non-tacky surface and an enhanced resistance to the adverse influence of ambient humidity.

5677110, Oct 14, 1997

Feb 29, 1996

8/609057

Joseph Hanlon - Bradenton FL
John M. Hardin - Jamaica Plain MA
Eugene L. Langlais - Norfolk MA
Yi-Hua Tsao - Waltham MA

Polaroid Corporation - Cambridge MA

G03F 711, G03F 730

430302

The present invention is directed to a method for the on-press development and printing of images. The method generally comprises the steps of providing a lithographic printing plate precursor element comprising a lithographic hydrophilic printing plate substrate, a photohardenable photoresist, and a layer of polymeric protective overcoat; imagewise exposing the precursor element to actinic radiation through said photoresist and overcoat layer sufficiently to photoharden the photoresist in exposed regions and provide a latent image in said photoresist layer; placing the precursor element onto a lithographic printing press; and running the press, whereby printing fluid effects removal of the overcoat and development of said latent image. In particular modes of practices, the method utilizes an overcoat having incorporated therein a water or fountain soluble or dispersible crystalline compound. The overcoat can be used as an oxygen barrier and/or to provide a non-tacky surface on the printing plate.

5620827, Apr 15, 1997

Jun 6, 1995

8/469475

Chieh-Min Cheng - Arlington MA
Anthony C. Giudice - Wakefield MA
John M. Hardin - Jamaica Plain MA
Leonard C. Wan - Chestnut Hill MA

Polaroid Corporation - Cambridge MA

G03C 172

430138

A lithographic printing plate precursor for use on a printing press, with minimal or no additional processing after exposure to actinic radiation, comprises a printing plate substrate, a polymeric resist layer capable of imagewise photodegradation or photohardening, and a plurality of microencapsulated developers capable of blanket-wise promoting the washing out of either exposed or unexposed areas of the polymeric resist. The microencapsulated developers may be integrated into the polymeric resist layer, or may form a separate layer deposited atop the polymeric resist layer, or may be coated onto a separate sheet support capable of being brought into face-to-face contact with conventional printing plates.

5677108, Oct 14, 1997

Apr 28, 1995

8/430876

Joseph Hanlon - Lowell MA
John M. Hardin - Jamaica Plain MA
Yi-Hua Tsao - Waltham MA

Polaroid Corporation - Cambridge MA

G03F 711

4302731

The present invention provides a quenching overcoat useful for application onto a lithographic printing plate, the overcoat having incorporated therein a water or fountain soluble or dispersible crystalline compound. The overcoat may be used as an oxygen barrier and/or to provide a non-tacky surface on the printing plate. By the incorporation of the crystalline compound, on-press removability of the overcoat is facilitated.