Patents Represented by Attorney Raymond B. Ledlie
  • Patent number: 4079029
    Abstract: Water swellable absorbent articles, made from latexes having a copolymerized crosslinker, together with methods for their preparation, and a composition containing a copolymerized crosslinker useful to make said articles are disclosed. The articles are crosslinked by heating and/or removing substantially all of the water from the precursor composition.The absorbent articles are useful as surgical sponges, diapers, tampons, meat trays, bath mats and the like.
    Type: Grant
    Filed: August 5, 1974
    Date of Patent: March 14, 1978
    Assignee: The Dow Chemical Company
    Inventor: James Richard Gross
  • Patent number: 4057521
    Abstract: Water swellable absorbent articles, made from copolymers having a copolymerized crosslinker, together with methods for their preparation, and a composition containing a copolymerized crosslinker useful to make said articles are disclosed. The articles are crosslinked by heating and/or removing substantially all of the water from the precursor composition.The absorbent articles are useful as surgical sponges, diapers, tampons, meat trays, bath mats and the like.
    Type: Grant
    Filed: August 5, 1974
    Date of Patent: November 8, 1977
    Assignee: The Dow Chemical Company
    Inventor: James R. Gross
  • Patent number: 4056502
    Abstract: Water swellable absorbent articles, made from polyelectrolytes, containing free carboxylic groups, together with methods for their preparation, and a composition useful to make said articles are disclosed. The composition contains bis-oxazolines or bis imino oxazolidines. The articles are crosslinked by heating and/or removing substantially all of the water from the precursor composition.The absorbent articles are useful as surgical sponges, diapers, tampons, meat trays, bath mats and the like.
    Type: Grant
    Filed: August 5, 1974
    Date of Patent: November 1, 1977
    Assignee: The Dow Chemical Company
    Inventor: James R. Gross
  • Patent number: 3996172
    Abstract: Mixtures comprising a low molecular weight polyol having a functionality of from 3 to about 8, a liquid modifier compound having a boiling point above 150.degree. C, such as a fatty acid or fatty oil, a polyisocyanate and a non-amine-containing catalyst, instantly set, after a brief induction period, to a solid, dense, non-elastomeric polymeric product which can be demolded within a period of from less than about 1 minute to about 5 minutes.
    Type: Grant
    Filed: December 17, 1973
    Date of Patent: December 7, 1976
    Assignee: The Dow Chemical Company
    Inventors: Franciszek Olstowski, Donald B. Parrish
  • Patent number: 3996272
    Abstract: This invention relates to a chemical process for preparing pentachloro-2-propanone (pentachloroacetone) and dichloroacetic acid from isopropyl ethers which may be partially chlorinated. The pentachloroacetone process is carried out by reacting the isopropyl ethers with chlorine in the presence of water to produce pentachloroacetone which can then be recovered. Alternatively, if dichloroacetic acid is desired, the pentachloroacetone process may be carried further by reacting the pentachloroacetone with a base-acting material to produce a salt of dichloroacetic acid and then reacting this salt with acid to produce dichloroacetic acid of about 95% purity.
    Type: Grant
    Filed: October 3, 1974
    Date of Patent: December 7, 1976
    Assignee: The Dow Chemical Company
    Inventors: Joanne D. Burger, William L. Howard
  • Patent number: 3976614
    Abstract: Aqueous dispersions of interpolymers containing a base monomer such as styrene or methyl methacrylate, an alkylene glycol monomer such as (tripropylene glycol methyl ether) acrylate and a,b-ethylenically unsaturated carboxylic acid such as acrylic acids are useful as low viscosity coating compositions which can be cured to water resistant coatings.
    Type: Grant
    Filed: December 26, 1974
    Date of Patent: August 24, 1976
    Assignee: The Dow Chemical Company
    Inventors: W. Jay Elms, Dieter H. Klein