Patents Represented by Attorney Carol J. Cavender
  • Patent number: 4996351
    Abstract: This invention is a process for removing volatile impurities from a crude isocyanate compound which is prepared in the phosgenation of a primary amine, comprising heating said crude isocyanate compound to a temperature to volatilize said volatile impurities in the presence of an acidic material containing a plurality of strong acid groups. The process permits faster, more complete removal of hydrolyzable chloride impurities than conventional processes.
    Type: Grant
    Filed: January 27, 1987
    Date of Patent: February 26, 1991
    Assignee: The Dow Chemical Company
    Inventors: John L. Nafziger, Mark J. Hazelrigg
  • Patent number: 4981877
    Abstract: A compatabilized active hydrogen compound-alkylene glycol composition comprises components (A) a relatively high equivalent weight material having an average of at least about 1.8 active hydrogen containing groups per molecule and a weight from about 500 to about 5000 per active hydrogen containing group; (B) an alkylene glycol which is incompatible with component (A) at the relative proportions thereof present in the composition; said composition having dissolved therein; (C) a compatibilizing amount of at least one thiourea compound. Preferably the composition also contains at least one transition metal salt of a carboxylic acid wherein said metal is selected from Groups I-B, II-B, V-A, IV-B, V-B, VI-B, VII-B or VIII of the Periodic Table of the Elements. The composition preferably also contains a sufficient quantity of at least one amine group-containing material that the salt is soluble in said composition.
    Type: Grant
    Filed: August 25, 1989
    Date of Patent: January 1, 1991
    Assignee: The Dow Chemical Company
    Inventor: Robert Carswell
  • Patent number: 4980388
    Abstract: A polyurea foam is formed from a reaction mixture comprising at least one polyisocyanate component and an active hydrogen component, wherein active hydrogen compounds of relatively high equivalent weight have an average of about 1.5 to about 10 active hydrogen-containing groups per molecule, of which active hydrogen-containing groups: an average of (a) from about 5 to about 60 percent are primary or secondary aliphatic amine groups or (b) at least about 25 percent are primary aromatic, Lewis acid-blocked primary aliphatic, secondary aliphatic or aromatic amine groups or mixtures thereof. Carbon dioxide is adducted to said active hydrogen component. The adduct releases carbon dioxide to blow the foam.
    Type: Grant
    Filed: October 17, 1988
    Date of Patent: December 25, 1990
    Assignee: The Dow Chemical Company
    Inventors: Ronald M. Herrington, Robert B. Turner, James R. Porter, Ralph D. Priester, Jr.
  • Patent number: 4977156
    Abstract: Amino piperazine esters, preferably of the formula: ##STR1## wherein x is 0 or 1 and each R is independently hydrogen or inert substitution, are produced by reacting an (optionally substituted) N-(2-aminoethyl) piperazine with an (optionally substituted) alkylene carbonate. The novel compounds are biocides that retard the growth of fungi and are also useful in preparing polymers.
    Type: Grant
    Filed: July 26, 1988
    Date of Patent: December 11, 1990
    Assignee: The Dow Chemical Company
    Inventors: Jimmy Myers, Wilfred W. Wilson
  • Patent number: 4970333
    Abstract: The production of esters via the reaction of an epoxide with a carboxylic acid hasbeen shown to give improved activity when a strong base macroporous anion exchange resin having an acrylic backbone is used in place of a styrene-divinylbenzene based anion exchange resin having an equivalent exchange capacity. Excellent results are obtained when acrylic acid and propylene oxide are reacted together in the presence of strong base macroporous anion exchange resins which have an acrylic backbone.
    Type: Grant
    Filed: October 29, 1987
    Date of Patent: November 13, 1990
    Assignee: The Dow Chemical Company
    Inventors: James A. Rabon, Jr., William C. Pike, Clinton J. Boriack
  • Patent number: 4943626
    Abstract: Polyether active hydrogen compounds having at least two terminal active hydrogen groups on primary carbon atoms are prepared by (a) forming polyoxyalkylene molecules each having at least one active hydrogen precursor, (b) linking at least two of the polyoxyalkylene molecules, and (c) converting the active hydrogen precursor groups to active hydrogen groups on primary carbon atoms. The polyoxyalkylene molecule is formed by exposing a reaction mixture comprising at least one alkylene oxide and at least one protective initiator to conditions effective for the polymerization of the alkylene oxides. Linking is accomplished at polyether chain ends distal to the protected active hydrogen precursor groups, such that the active hydrogen precursors remain on the linked polyether chains until they are converted to active hydrogen groups.
    Type: Grant
    Filed: July 29, 1988
    Date of Patent: July 24, 1990
    Assignee: The Dow Chemical Company
    Inventors: James E. McGrath, Youngtai Yoo, Robert B. Turner, Diane M. Lewis
  • Patent number: 4912142
    Abstract: This invention is an antistatic thermoplastic, phase-segregated polyurethane containing, as an antistatic additive an effective amount of a monovalent metal tetraphenylboron salt, in the substantial absence of a fatty acid salt, a C.sub.6 -C.sub.30 carboxylic acid ester or phosphate ester compound.Suprisingly, it has been found that, with this particular type of polyurethane, tetraphenylboron salts are very effective antistatic additives even in the absence of enhancer compounds as were previously employed. Accordingly, the antistatic polyurethane is useful for applications such as electronics components and packaging, and other applications where static dissipative ability is needed or desirable.
    Type: Grant
    Filed: November 16, 1988
    Date of Patent: March 27, 1990
    Assignee: The Dow Chemical Company
    Inventors: Robbert M. Vermeulen, Donald M. Maschmeyer
  • Patent number: 4904704
    Abstract: A method of treating toluene diisocyanate distillation residues comprising reacting the residues with at least about 0.5 equivalents, based on hydrolyzable chloride concentration of the residues, of an epoxy compound at a temperature of from about 155 to about C. to produce a treated distillation residue having a hydrolyzable chloride level of less than about 800 parts per million (ppm) is taught. The product of the method is useful, for instance, in producing rigid foams with low K Factors.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: February 27, 1990
    Assignee: The Dow Chemical Company
    Inventors: John L. Nafziger, Steven B. Lowenkron, Charles E. Koehler, Debkumar Bhattacharjee
  • Patent number: 4722942
    Abstract: This invention is an active hydrogen-containing composition suitable for the production of flexible polyurethane foam when reacted with a polyisocyanate, said composition comprising,(a) a polyol having an average functionality of about 2.0 to about 4.0, having at least about 50% of its active hydroxyl groups in the form of primary hydroxyl groups, and an equivalent weight from about 500 to about 5000;(b) from about 0.5 to about 5 parts, per 100 parts by weight of component (a) of a crosslinker selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, methylene bis(o-chloroaniline) and mixtures thereof; and(c) at least about 0.
    Type: Grant
    Filed: February 27, 1987
    Date of Patent: February 2, 1988
    Assignee: The Dow Chemical Company
    Inventors: Jerram B. Nichols, Hans R. Friedli, Stephen R. Burks