Recovery From Photographic Film Patents (Class 536/40)
  • Process for preparing carboxyalkyl cellulose esters
    Patent number: 5792856
    Abstract: This invention provides certain carboxymethyl cellulose (CMC) esters of higher acids (e.g., CMC acetate propionate, CMC propionate, CMC acetate butyrate, and CMC butyrate). These new ether derivatives of cellulose esters exhibit solubility in a wide range of organic solvents, compatibility with a variety of resins, and ease of dispersion in a water-borne formulation and are useful in coating compositions as binder resins and rheology modifiers.
    Type: Grant
    Filed: May 22, 1997
    Date of Patent: August 11, 1998
    Inventors: John Michael Allen, Alan Kent Wilson, Paul Lee Lucas, Larry Gerald Curtis
  • Chemical process for the denitration of nitrocellulose
    Patent number: 4814439
    Abstract: An improved chemical process is provided for the disposal of scrap nitroculose. The process involves the use of organic sulfhydryl-containing compounds to effect the nitrogen release from the nitrocellulose polymer. The nitrogen released by the application of this procedure is in the form of inorganic nitrite ions. The process is in effect a nucleophilic attack on the nitrocellulose, and is accompanied by cleavage or breakage of the cellulose chain.
    Type: Grant
    Filed: August 17, 1987
    Date of Patent: March 21, 1989
    Assignee: The United States of America as repesented by the Secretary of the Army
    Inventors: Kenneth Gold, Bruce W. Brodman
  • Regenerated cellulose film recovery process
    Patent number: 4098996
    Abstract: Waste raw uncoated and/or coated (such as saran, nitrocellulose and vinyl) regenerated cellulose film is treated to recover its plasticizer and cellulose components for recycling in the manufacture of regenerated cellulose film. The platicizer is first recovered from comminuted waste film particles via extraction with water. The moist comminuted film particles are then converted to viscose, from which coating solids, if any, are removed. The viscose is thereafter employed in the manufacture of regenerated cellulose film.
    Type: Grant
    Filed: February 22, 1977
    Date of Patent: July 4, 1978
    Assignee: FMC Corporation
    Inventors: Daniel John Ryan, Edward Andrew Wielicki