Edward J Dombrowski

US Patent:

6537410, Mar 25, 2003

Filed:

Dec 21, 2000

Appl. No.:

09/745700

Inventors:

Michael J. Arnost - North Andover MA
Alain Bouchard - Boston MA
Yongqi Deng - Newton MA
Edward J. Dombrowski - Bellingham MA
Russell A. Gaudiana - Merrimack NH
Serajul Haque - Randolph MA
Fariza B. Hasan - Waltham MA
John L. Marshall - Lexington MA
Stephen J. Telfer - Arlington MA
William T. Vetterling - Lexington MA
Michael S. Viola - Burlington MA

Assignee:

Polaroid Corporation - Waltham MA

International Classification:

B41M 530

US Classification:

156235, 106 3129, 428195

Abstract:

There is described a thermal recording system which utilizes a donor element comprising a substrate and a thermal transfer material layer having a dye-containing phase which is amorphous and wherein the dye or dyes present in the amorphous phase form a continuous film. Imagewise heating of the medium transfers portions of the transfer layer to a receiver sheet, thus forming an image. The transfer layer may also include a non-dye phase comprising a thermal solvent. During the heating of the donor element, the crystalline thermal solvent melts and dissolves or liquefies at least a portion of the dye-containing phase, thereby lowering the temperature at which transfer of the transfer layer occurs.

US Patent:

57504636, May 12, 1998

Filed:

Apr 22, 1997

Appl. No.:

8/837701

Inventors:

Edward J. Dombrowski - Bellingham MA
Robert L. Jones - Dracut MA
John C. Warner - Norwood MA
Jiyue Yang - Warwick NY

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

B41M 532

US Classification:

503204

Abstract:

There is described a novel thermographic recording film, and more specifically, a novel image-forming system incorporated therein which employs both thiolactone and silver reduction chemistries. Thermographic recording films comprising the novel image-forming system of the present invention exhibit excellent thermal sensitivity and visual color saturation, enhanced image density, and desirable visual minimum optical densities.

US Patent:

51962977, Mar 23, 1993

Filed:

Dec 5, 1986

Appl. No.:

6/935534

Inventors:

Edward J. Dombrowski - Allston MA
James R. Freedman - Newton Centre MA
Patrick F. King - North Quincy MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

G03C 173
G03C 1494
B41M 530
B41M 534

US Classification:

430338

Abstract:

This invention relates to novel recording materials which employ color-forming di- and triarylmethane compounds possessing certain S-containing ring-closing moieties, namely, or thiolactone, dithiolactone or thioether ring-closing moiety and to a method of forming color by contacting these dye precursor compounds with a Lewis acid material capable of opening the thiolactone, dithiolactone or thioether ring-closing moiety whereby the compound is rendered colored, that is, converted to its chromophore color.

US Patent:

54895669, Feb 6, 1996

Filed:

Jan 10, 1994

Appl. No.:

8/179516

Inventors:

Edward J. Dombrowski - Bellingham MA
John R. McPherson - West Newton MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

B41M 532

US Classification:

503207

Abstract:

There is described, in thermographic recording films, the use of a compound containing at least two epoxide moieties in the protective layer and/or in a layer on top of the protective layer of thermographic recording films to reduce gouging and streaking of the printed image film and to reduce head build-up on the thermal printhead.

US Patent:

52781275, Jan 11, 1994

Filed:

Jan 27, 1993

Appl. No.:

8/009829

Inventors:

Edward J. Dombrowski - Bellingham MA
John R. McPherson - West Newton MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

B41M 532

US Classification:

503207

Abstract:

This invention relates to the use of a compound containing at least two epoxide moieties in the protective topcoat layer and/or in a layer on top of the protective topcoat layer of certain thermographic recording films to reduce gouging and streaking of the printed image film and to reduce head build-up on the thermal printhead.

US Patent:

54808553, Jan 2, 1996

Filed:

Feb 8, 1994

Appl. No.:

8/193223

Inventors:

Edward J. Dombrowski - Bellingham MA
Robert L. Jones - Dracut MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

B41M 540

US Classification:

503207

Abstract:

This invention relates to thermographic recording films including both a topcoat and a washcoat. The washcoat comprises at least one quaternary ammonium salt including at least one hydroxyl functional group, and a compound containing at least two epoxide moieties. The subject washcoat, in conjunction with the topcoat, reduces printer head build-up and streaking of the printed image film while simultaneously increases the anti-stat and slip properties of the film.

US Patent:

49045725, Feb 27, 1990

Filed:

Apr 18, 1988

Appl. No.:

7/182966

Inventors:

Edward J. Dombrowski - Cambridge MA
Patrick F. King - North Quincy MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

G03C 140

US Classification:

430332

Abstract:

This invention relates to the use of 3,5-dihydroxybenzoic acid as an organic acidic reagent in thermographic recording materials comprising a di- or triarylmethane thiolactone dye precursor, silver behenate and a polymeric binder, and in a further embodiment, relates to coating compositions useful in the preparation of the recording materials.

US Patent:

57504644, May 12, 1998

Filed:

Apr 22, 1997

Appl. No.:

8/837775

Inventors:

Edward J. Dombrowski - Bellingham MA
Donna J. Guarrera - Addlestone, GB2
Robert L. Jones - Dracut MA
Mark R. Mischke - Arlington MA
John C. Warner - Norwood MA
Jiyue Yang - Warwick NY

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

B41M 532

US Classification:

503204

Abstract:

There is described a novel thermographic recording film, and more specifically, a novel image-forming system incorporated therein comprising at least one layer and including and a Lewis acid material, a di- or triarylmethane thiolactone dye precursor, an acidic organic material, a binder and a thermal stabilizer. Thermographic recording films comprising the novel image-forming system of the present invention exhibit excellent thermal stability, and desirable minimum optical densities, indicative of substantially less premature image development at elevated environmental temperatures. Embodiments of the invention wherein the thermographic recording films further include a light insensitive organic silver salt, a reducing agent, a binder and, preferably, a toning agent, show substantially enhanced image density.