William H. Chambers
Electrician in Wilmington, DE
License number
Delaware TH-0005472
Issued Date
Apr 21, 2010
Expiration Date
Apr 21, 2011
Category
Electrical Examiners
Type
Homeowner's Permit
Address
Address
2
Wilmington, DE 19805
Professional information
Photopolymerizable Compositions Based On Salt-Forming Polymers And Polyhydroxy Polyethers
US Patent:
4245031, Jan 13, 1981
Filed:
Sep 18, 1979
Appl. No.:
6/076621
Inventors:
William J. Chambers - Wilmington DE
Assignee:
E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:
G03C 168
US Classification:
430288
Abstract:
Photopolymerizable compositions containing
(1) a polymer having a plurality of salt-forming groups,
(2) an ethylenically unsaturated compound having at least one complementary salt-forming group,
(3) an ethylenically unsaturated diester polyhydroxy polyether of the formula ##STR1## where R is H or CH. sub. 3 ; R. sup. 1 is H or an alkyl group of 1-4 carbon atoms; n is 1-15; p is 0 or 1; and when p is 1, R. sup. 2 is H or CH. sub. 3, and R. sup. 3 is H, CH. sub. 3 or C. sub. 2 H. sub. 5 ; and
(4) a radiation-sensitive, free-radical generating system
provide photopolymerizable elements which have outstanding photospeeds and are relatively insensitive to oxygen.
Elements And Method Which Use Photopolymerizable Compositions Based On Salt-Forming Polymers And Polyhydroxy Polyethers
US Patent:
4291115, Sep 22, 1981
Filed:
Sep 17, 1980
Appl. No.:
6/188223
Inventors:
William J. Chambers - Wilmington DE
Assignee:
E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:
G03C 168, G03C 590
US Classification:
430271
Abstract:
Photopolymerizable compositions containing
(1) a polymer having a plurality of salt-forming groups,
(2) an ethylenically unsaturated compound having at least one complementary salt-forming group,
(3) an ethylenically unsaturated diester polyhydroxy polyether of the formula ##STR1## where R is H or CH. sub. 3 ; R. sup. 1 is H or an alkyl group of 1-4 carbon atoms; n is 1-15; p is 0 or 1; and when p is 1, R. sup. 2 is H or CH. sub. 3, and R. sup. 3 is H, CH. sub. 3 or C. sub. 2 H. sub. 5 ; and
(4) a radiation-sensitive, free-radical generating system
provide photopolymerizable elements which have outstanding photospeeds and are relatively insensitive to oxygen.
Radiation Sensitive Element Having A Thin Photopolymerizable Layer
US Patent:
4264708, Apr 28, 1981
Filed:
Mar 26, 1980
Appl. No.:
6/134229
Inventors:
William J. Chambers - Wilmington DE
Christina N. Lazaridis - Wilmington DE
Christina N. Lazaridis - Wilmington DE
Assignee:
E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:
G03C 168
US Classification:
430278
Abstract:
A photopolymerizable element, preferably a lithographic plate, is provided. This element comprises a substrate bearing a photopolymerizable layer having a weight of about 1 to about 90 mg/dm. sup. 2, said layer comprising:
(1) at least one ethylenically unsaturated diester polyhydroxy polyether of the formula ##STR1## wherein R is H or CH. sub. 3 ; R. sup. 4 is H or an alkyl of 1-4 carbon atoms; n is 1-15; p is 0 or 1; and, when p is 1, R. sup. 5 is H or CH. sub. 3, and R. sup. 6 is H, CH. sub. 3 or C. sub. 2 H. sub. 5 ;
(2) an organic, radiation-sensitive, free-radical generating system comprising 2,4,5-triarylimidazolyl dimer and p-aminophenyl ketone; and
(3) a macromolecular, organic, polymeric binder.
A polymeric image is formed by imagewise exposing the layer to actinic radiation and then developing the resulting image such as by removing unexposed portions of the layer with a solvent.
Methods Of Imaging Photopolymerizable Materials Containing Diester Polyether
US Patent:
4308338, Dec 29, 1981
Filed:
Dec 4, 1980
Appl. No.:
6/212859
Inventors:
William J. Chambers - Wilmington DE
Christina N. Lazaridis - Wilmington DE
Christina N. Lazaridis - Wilmington DE
Assignee:
E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:
G03C 500
US Classification:
430300
Abstract:
A photopolymerizable element, preferably a lithographic plate, is provided. This element comprises a substrate bearing a photopolymerizable layer having a weight of about 1 to about 90 mg/dm. sup. 2, said layer comprising:
(1) at least one ethylenically unsaturated diester polyhydroxy polyether of the formula ##STR1## wherein R is H or CH. sub. 3 ; R. sup. 4 is H or an alkyl of 1-4 carbon atoms; n is 1-15; p is 0 or 1; and, when p is 1, R. sup. 5 is H or CH. sub. 3, and R. sup. 6 is H, CH. sub. 3 or C. sub. 2 H. sub. 5 ;
(2) an organic, radiation-sensitive, free-radical generating system comprising 2,4,5-triarylimidazolyl dimer and p-aminophenyl ketone; and
(3) a macromolecular, organic, polymeric binder.
A polymeric image is formed by imagewise exposing the layer to actinic radiation and then developing the resulting image such as by removing unexposed portions of the layer with a solvent.
Photosensitive Composition And Method For Forming A Neutral Black Image
US Patent:
4520093, May 28, 1985
Filed:
Jan 30, 1984
Appl. No.:
6/575062
Inventors:
William J. Chambers - Wilmington DE
Assignee:
E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:
G03C 500
US Classification:
430292
Abstract:
A photosensitive composition, a photosensitive element employing said composition, and an improved photoimaging method that utilizes the disclosed composition. The improved method concerns a photosensitive element, formed from a photosensitive composition having a substrate layered with silver halide particles in operative association with a polymeric coupler, latently imaged, developed to render the imaged area insoluble, and washed to remove the undeveloped portion of the layer, wherein the improvement comprises addition of selected dispersed pigments to the polymeric coupler so that the optical density of the final image is neutral black.
Photosensitive Polyaldehydes And Use In Photoimaging
US Patent:
4108839, Aug 22, 1978
Filed:
Jan 21, 1977
Appl. No.:
5/760935
Inventors:
William John Chambers - Wilmington DE
Robert Paul Foss - Hockessin DE
Robert Paul Foss - Hockessin DE
Assignee:
E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:
C08G 228, C08G 232, C08G 236
US Classification:
528270
Abstract:
Photosensitive polyaldehydes are provided which have the formula: ##STR1## WHEREIN R is a photosensitive end group selected from ##STR2## R. sup. 1 is H or n-alkyl of 1-5 carbon atoms, preferably H, R. sup. 2 is (a) n-alkanoyl of 1-4 carbon atoms or (b) n-alkanoyl of 1-4 carbon atoms or ##STR3## when R. sup. 1 is H, and n is a positive integer of about 10-4000. The polyaldehydes are prepared by the anionic polymerization of the appropriate aldehyde with an initiating amount of an alkali metal or tetraalkylammonium alkoxide of RO in the above formula.
The polyaldehydes are useful in articles and methods of relief imaging and in lithographic plates.
Soil-Repellent Coating Compositions
US Patent:
3940359, Feb 24, 1976
Filed:
May 8, 1974
Appl. No.:
5/468199
Inventors:
William John Chambers - Wilmington DE
Assignee:
E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:
C08L 2712
US Classification:
260 296F
Abstract:
Aqueous dispersions are disclosed containing up to 50% of particulate solids having a particle size less than 1. mu. and consisting essentially of
A. 4 parts by weight of particles of hydrous metal oxides such as silica, alumina or aluminum-modified silica, and
B. from 1 to 16 parts by weight of particles of a polymer containing from 0. 5% to 92% by weight of --CF. sub. 3 groups, and preferably having a Knoop hardness of at least 5.
The dispersions can be used to coat fabrics, painted surfaces and the like to enhance soil repellancy.
Photosensitive Article Having Polyaldehydes And Its Use In Photoimaging
US Patent:
4150989, Apr 24, 1979
Filed:
Oct 6, 1977
Appl. No.:
5/841827
Inventors:
William J. Chambers - Wilmington DE
Robert P. Foss - Hockessin DE
Robert P. Foss - Hockessin DE
Assignee:
E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:
G03C 500, G03C 168, G03C 178
US Classification:
96 351
Abstract:
Photosensitive polyaldehydes are provided which have the formula: ##STR1## wherein R is a photosensitive end group selected from ##STR2## R. sup. 1 is H or n-alkyl of 1-5 carbon atoms, preferably H, R. sup. 2 is (a) n-alkanoyl of 1-4 carbon atoms or (b) n-alkanoyl of 1-4 carbon atoms or ##STR3## when R. sup. 1 is H, and N IS A POSITIVE INTEGER OF ABOUT 10-4000.
The polyaldehydes are prepared by the anionic polymerization of the appropriate aldehyde with an initiating amount of an alkali metal or tetraalkylammonium alkoxide of RO in the above formula.
The polyaldehydes are useful in articles and methods of relief imaging and in lithographic plates.
Photoimaging Process
US Patent:
4335197, Jun 15, 1982
Filed:
Nov 25, 1980
Appl. No.:
6/210232
Inventors:
William J. Chambers - Wilmington DE
Louis Plambeck - Wilmington DE
Louis Plambeck - Wilmington DE
Assignee:
E. I. Du Pont de Nemours and Company - Wilmington DE
International Classification:
G03C 500
US Classification:
430271
Abstract:
A method for producing a photopolymer image comprising (a) exposing, imagewise, a photosensitive element to actinic radiation, said element comprising a substrate coated with a photosensitive layer containing dispersed silver halide particles in operative association with a continuous film-forming phase of polymeric coupler, said coupler having (i) a number average molecular weight of about 2,000 to 100,000, (ii) a content of about 10 to 100 milliequivalents per 100 g of polymeric coupler of acidic methylene coupler groups and about 15 to 175 milliequivalents per 100 g of polymeric coupler of at least one of carboxylic, sulfonic and phosphonic acid groups, and (iii) the ability to couple with a monofunctional developing agent thus becoming water-insoluble; (b) developing (insolubilizing) the latent image; and (c) removing the undeveloped, soluble portion of the photosensitive element by washing with aqueous solvent.