Patents Assigned to Elf Atochem N.A., Inc.
  • Scorch retarded, crosslinkable compositions of peroxide or azo compound curable thermoplastic polymers, elastomeric polymers or mixtures thereof containing hydroquinones, sulfur accelerators and peroxides or azo compounds
    Patent number: 6069208
    Abstract: A crosslinkable composition of a polymeric thermoplastic and/or elastomeric material which is susceptible to scorching when processed at elevated temperatures, prior to crosslinking, in the presence of a free radical initiator, is protected against such scorching by the incorporation therein of a mixture of at least one hydroquinone compound and a sulfur accelerator. This mixture may also contain at least one monomeric allylic, methacrylic, acrylic or diene type coagent. The mixture exhibits a synergistic effect resulting in improved scorch protection for peroxide cured systems when compared with the protection afforded by the components singly.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: May 30, 2000
    Assignee: ELF Atochem N.A., Inc.
    Inventors: Michael Fred Novits, Chester Joseph Kmiec, Edward Phillip Hibbard
  • Protection of lead-containing anodes during chromium electroplating
    Patent number: 5453175
    Abstract: The present invention provides an improved method for electroplating chromium, using lead anodes, while achieving the advantages of using methanesulfonic acid without suffering the excessive anode-corrosion characteristics associated with that acid. Accordingly, chromium is electrodeposited from a bath containing chromic acid, sulfate ion and an alkylpolysulfonic acid containing from one to about three carbon atoms. The preferred alkylpolysulfonic acid is methanedisulfonic acid.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: September 26, 1995
    Assignee: Elf Atochem N. A., Inc.
    Inventor: Kenneth R. Newby
  • Preparation of propanone-1,3-disulfonic acid
    Patent number: 5430180
    Abstract: Propanone-1,3-disulfonic acid (acetone disulfonic acid) may be prepared by reacting chlorosulfonic acid with acetone preferably in the presence of a solvent for the reactants, such as methylene chloride, although a neat reaction is possible. The reactants and reaction conditions prior to separation should be substantially anhydrous, but water may be added after reaction to separate the product as an aqueous solution.
    Type: Grant
    Filed: February 16, 1994
    Date of Patent: July 4, 1995
    Assignee: Elf Atochem N.A., Inc.
    Inventor: Stanley R. Sandler
  • Process for preparing color-stable tertiary butyldiethanolamine
    Patent number: 5424482
    Abstract: Tertiary-butyldiethanolamine subject to color deterioration is purified and stabilized against color formation by vacuum distilling said amine at a pressure within the range of 1 to 50 mm.
    Type: Grant
    Filed: August 8, 1991
    Date of Patent: June 13, 1995
    Assignee: Elf Atochem N.A., Inc.
    Inventors: Thomas H. Overgaard, Louis P. Verduce
  • Epoxy resins containing bound light stabilizing groups
    Patent number: 5318851
    Abstract: Curable compositions which are precursors for cured or partially cured light stabilized epoxy resins which are the product of the reaction of some or all of the epoxy groups of an epoxy resin with an N-(2,2,6,6-tetraalkyl-4-piperidinyl)amic acid hydrazide as well as the cured or partially cured reaction products thereof together with processes for their use and articles of manufacture produced thereby are disclosed.
    Type: Grant
    Filed: April 2, 1993
    Date of Patent: June 7, 1994
    Assignee: Elf Atochem N.A., Inc.
    Inventors: Arthur L. Baron, Ronald E. MacLeay, Jennifer P. Kmiec
  • HF extraction of R365 from R141B
    Patent number: 5208398
    Abstract: Separation of a mixture of R365 and R141b by liquid-liquid extraction with HF.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: May 4, 1993
    Assignee: Elf Atochem N.A., Inc.
    Inventor: John A. Wismer