Patents by Inventor Robert K. Barr

Robert K. Barr has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Photoimageable compositions having improved stripping properties in aqueous alkaline solutions
    Patent number: 5922509
    Abstract: A negative-acting photoimageable composition useful as a photoresist comprises an acid-functional binder polymer, a photopolymerizable component, and a photoinitiator chemical system, in which the binder polymer has a multi-modal molecular weight distribution used to promote faster photoresist stripping times and a smaller stripped particle size. The combination of faster stripping times and smaller stripped particle size allows for fully aqueous, environmentally friendly, stripping of the photoresist from overplated circuit boards.
    Type: Grant
    Filed: March 18, 1998
    Date of Patent: July 13, 1999
    Assignee: Morton International, Inc.
    Inventors: Randall W. Kautz, Robert K. Barr
  • Waterborne photoresists having binders with sulfonic acid functionality
    Patent number: 5411837
    Abstract: A waterborne photoimageable composition or photoresist comprises a latex binder polymer having acid acid functionality to render it developable in alkaline aqueous solution, at least about 50 mole percent of the acid functionality being sulfonic acid moieties, a photopolymerizeable monomer fraction, and a photoinitiator chemical system.
    Type: Grant
    Filed: May 12, 1994
    Date of Patent: May 2, 1995
    Assignee: Morton International, Inc.
    Inventors: Stephen E. Bottomley, Daniel E. Lundy, Betsy Dadah, Robert K. Barr
  • Waterborne photoresists having binders neutralized with amino acrylates
    Patent number: 5393643
    Abstract: A waterborne photoimageable composition or photoresist comprises a latex binder polymer having acid functionality to render it developable in alkaline aqueous solution, which acid functionality is neutralized to at least about 1 mole percent with an amino acrylate, a photopolymerizeable monomer fraction, and a photoinitiator chemical system.
    Type: Grant
    Filed: May 4, 1994
    Date of Patent: February 28, 1995
    Assignee: Morton International, Inc.
    Inventors: Daniel E. Lundy, Robert K. Barr, Thanh N. Tran
  • Waterborne photoresists having non-ionic fluorocarbon surfactants
    Patent number: 5389495
    Abstract: A waterborne photoimageable composition or photoresist comprises a latex binder polymer having sufficient carboxylic acid functionality to render it developable in alkaline aqueous solution, a photopolymerizeable monomer fraction, a photoinitiator chemical system and surfactant which is a fluoroaliphatic oxyethylene adduct.
    Type: Grant
    Filed: April 6, 1994
    Date of Patent: February 14, 1995
    Assignee: Morton International, Inc.
    Inventor: Robert K. Barr
  • Waterborne photoresists having polysiloxanes
    Patent number: 5387494
    Abstract: A waterborne photoimageable composition or photoresist comprises a latex binder polymer having sufficient carboxylic acid functionality to render it developable in alkaline aqueous solution, a photopolymerizeable monomer fraction, a photoinitiator chemical system and a poly(siloxane(s)).
    Type: Grant
    Filed: March 30, 1994
    Date of Patent: February 7, 1995
    Assignee: Morton International, Inc.
    Inventors: Robert K. Barr, Gene A. Derrico
  • Waterbone photoresists having associate thickeners
    Patent number: 5364737
    Abstract: A waterborne photoimageable composition or photoresist comprises a latex binder polymer having sufficient carboxylic acid functionality to render it developable in alkaline aqueous solution, a photopolymerizeable monomer fraction, a photoinitiator and a polyether polyurethane associate thickener which supports an emulsion of the monomer fraction in aqueous medium. The carboxylic acid functionality of the latex binder polymer is neutralized at from 0 to about 20%.
    Type: Grant
    Filed: February 18, 1994
    Date of Patent: November 15, 1994
    Assignee: Morton International, Inc.
    Inventor: Robert K. Barr
  • Photoimageable composition having improved adhesion promoter
    Patent number: 5320933
    Abstract: A photoimageable composition contains from 0.5 to 5 wt. percent of a compound of the formula: ##STR1## wherein R=alkyl, aryl, aralkyl, alkenyl, alkynyl, and substituted forms thereofX=OR', SR', NR'.sub.2, R'R'=H, R, CO--R,G=nothing or C.sub.1 -C.sub.8 alipathic hydrocarbon, andY=COOH, PO.sub.3 H, SO.sub.3 H, SO.sub.2 H and SOH. X'=R'to promote adhesion of the photoimageable composition to metal.
    Type: Grant
    Filed: November 20, 1992
    Date of Patent: June 14, 1994
    Assignee: Morton International, Inc.
    Inventors: Daniel E. Lundy, Robert K. Barr, James G. Shelnut