Patents by Inventor Donald A. Tomalia

Donald A. Tomalia 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).

  • Patent number: 4331785
    Abstract: Compounds represented by the formula ##STR1## and addition polymers thereof where m is an integer from 2 to about 10, X- is chlorine, hydroxy, carboxy or-AC-R).dbd.CH.sub.2-R is hydrogen or methyl, -R' is an ethylene or propylene group and-AC-R).dbd.CH.sub.2is one of ##STR2## These compounds and their addition polymers form complexes with alkali metal or alkaline earth metal salts and permit the concentration of aqueous solutions of said salts. For example, a compound of the formula ##STR3## is polymerized with an azobis(isobutyronitrile) catalyst to form addition polymers of the repeating unit ##STR4## When cross-linked, rendering it water-insoluble, such an addition polymer concentrates an aqueous solution of sodium chloride when contacted with same at about 0.degree. C.
    Type: Grant
    Filed: December 28, 1979
    Date of Patent: May 25, 1982
    Assignee: The Dow Chemical Co.
    Inventors: Thomas A. Chamberlin, Donald A. Tomalia
  • Patent number: 4287052
    Abstract: In the beneficiation of phosphate ore by flotation of siliceous material, the use of an alkyl-substituted phenyl ether amine or a hydroxyalkylated derivative thereof as a collector affords improved separation of phosphate from the siliceous matter.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: September 1, 1981
    Assignee: The Dow Chemical Company
    Inventors: Robert E. Hefner, Jr., Donald A. Tomalia
  • Patent number: 4267350
    Abstract: A novel imidazolinium salt is prepared by (1) reacting N-aminoalkyl-imidazoline, N-hydroxyalkyl-imidazoline, or N-substituted-imidazoline with an .alpha.,.beta.-unsaturated ester of a carboxylic acid, (2) reacting the resulting ester imidazoline with a primary or secondary amine and (3) quaternizing the resulting amido imidazoline product by reacting it with an alkylating agent. This imidazolinium salt is useful as a fabric softening agent.
    Type: Grant
    Filed: December 12, 1979
    Date of Patent: May 12, 1981
    Assignee: The Dow Chemical Company
    Inventors: Donald A. Tomalia, Fredric L. Buchholz
  • Patent number: 4265825
    Abstract: N-(haloalkyl)sulfonamides represented by the formula ##STR1## wherein R.sub.1 is a C.sub.1 -C.sub.20 aryl, alkaryl, aralkyl or alkyl group; R.sub.2, R.sub.3 and R.sub.4 are each independently hydrogen or methyl groups; n is the integer 0 or 1 and X is a chloro, bromo or iodo group, are prepared by reacting an N-(haloalkyl)sulfonyl imide with a C.sub.1 -C.sub.6 alkanol.
    Type: Grant
    Filed: September 17, 1979
    Date of Patent: May 5, 1981
    Assignee: The Dow Chemical Company
    Inventors: Peter W. Owen, Zita K. Harmon, Donald A. Tomalia
  • Patent number: 4261925
    Abstract: Surfactants having an HLB of from about 12 to about 20, preferably 14 to about 20, are disclosed which correspond to formulas I and II: ##STR1## wherein: R.sub.1 is a nonpolymerizable hydrocarbyl or inertly-substituted hydrocarbyl group of at least 8 carbon atoms; R.sub.2 is hydrogen or alkyl; X is ##STR2## Y is a terminal inorganic or organic group; and n is at least 2.
    Type: Grant
    Filed: April 5, 1978
    Date of Patent: April 14, 1981
    Assignee: The Dow Chemical Company
    Inventors: Donald A. Tomalia, James D. Huffines
  • Patent number: 4257970
    Abstract: Novel N-(haloalkyl)sulfonyl imides represented by the formula ##STR1## are prepared by the reaction of a 2-alkyl- or 2-aryl-oxazoline or oxazine with an arylene or alkane sulfonyl halide. In the formula for the novel sulfonyl imide, R.sub.1 and R.sub.2 are each independently C.sub.1 -C.sub.20 aryl, alkaryl or alkyl groups; R.sub.3, R.sub.4 and R.sub.5 are each hydrogen or methyl groups; n is the integer 0 or 1 and X is a chloro, bromo or iodo group. These novel sulfonyl imides are particularly useful in the preparation of N-(2-chloroethyl)- and N-(3-chloropropyl)sulfonamides.
    Type: Grant
    Filed: September 17, 1979
    Date of Patent: March 24, 1981
    Assignee: The Dow Chemical Company
    Inventor: Donald A. Tomalia
  • Patent number: 4256855
    Abstract: Compounds represented by the formula ##STR1## and addition polymers thereof where m is an integer from 2 to about 10, x--is chlorine, hydroxy, carboxy or--AC--R).dbd.CH.sub.2--R is hydrogen or methyl, --R' is an ethylene or propylene group and--AC--R).dbd.CH.sub.2is one of ##STR2## These compounds and their addition polymers form complexes with alkali metal or alkaline earth metal salts and permit the concentration of aqueous solutions of said salts. For example, a compound of the formula ##STR3## is polymerized with an azobis(isobutyronitrile) catalyst to form addition polymers of the repeating unit ##STR4## When cross-linked, rendering it water-insoluble, such an addition polymer concentrates an aqueous solution of sodium chloride when contacted with same at about 0.degree. C.
    Type: Grant
    Filed: November 16, 1978
    Date of Patent: March 17, 1981
    Assignee: The Dow Chemical Company
    Inventors: Thomas A. Chamberlin, Donald A. Tomalia
  • Patent number: 4245063
    Abstract: A thermosetting powder coating composition is disclosed herein. The composition comprises a solid pulverulent mixture of (A) a substantially linear vinyl addition interpolymer having a plurality of pendant 2-oxazoline and/or 2-oxazine groups, a number average molecular weight of from about 5,000 to about 25,000, and a melting point of from about 60.degree. C. to 90.degree. C., and (B) a solid polycarboxylic acid melting in the range of 70.degree. C. to 175.degree. C. which is included in an amount of from 0.75 to 1.25 carboxy equivalents per pendant oxazoline or oxazine group on the interpolymer. The utility of the above composition as a powder coating is further enhanced by inclusion of a plasticizer (e.g., a long chain monocarboxylic acid) and in practice, the powder compositions also normally include pigments and minor amounts of flow control agents. The instant powder coatings are applied by conventional techniques and cured at temperatures normally in the range of from about 150.degree. C. to about 200.
    Type: Grant
    Filed: October 16, 1978
    Date of Patent: January 13, 1981
    Assignee: The Dow Chemical Company
    Inventors: Bruce P. Thill, Donald A. Tomalia
  • Patent number: 4139539
    Abstract: Compounds represented by the formula ##STR1## AND ADDITION POLYMERS THEREOF WHERE M IS AN INTEGER FROM 2 TO ABOUT 10, X-- is chlorine, hydroxy, carboxy or--AC--(R).dbd.CH.sub.2--r is hydrogen or methyl, --R-- is an ethylene or propylene group and--AC--(R).dbd.CH.sub.2is one of ##STR2## These compounds and their addition polymers form complexes with alkali metal or alkaline earth metal salts and permit the concentration of aqueous solutions of said salts. For example, a compound of the formula ##STR3## is polymerized with an azobis(isobutyronitrile) catalyst to form addition polymers of the repeating unit ##STR4## When cross-linked, rendering it water-insoluble, such an addition polymer concentrates an aqueous solution of sodium chloride when contacted with same at about 0.degree. C.
    Type: Grant
    Filed: December 17, 1976
    Date of Patent: February 13, 1979
    Assignee: The Dow Chemical Company
    Inventors: Thomas A. Chamberlin, Donald A. Tomalia
  • Patent number: 4112067
    Abstract: Dermatitis caused by exposure of the skin to a plant of the genus Rhus is treated and controlled by the topical application of an effective amount of a polyamine or polytertiaryamide.
    Type: Grant
    Filed: February 17, 1977
    Date of Patent: September 5, 1978
    Assignee: The Dow Chemical Company
    Inventors: Donald A. Tomalia, Yancey J. Dickert, Leslie P. McCarty
  • Patent number: 4016192
    Abstract: Ethylenically-unsaturated products are obtained by (a) reacting acrylic acid and 2-oxazoline or a 2-alkyl or aryl-2-oxazoline in an inert liquid reaction medium and (b) recovering the desired product from (a) by heating the reaction mixture under reduced pressure to strip away the liquid diluent and volatile components, thus leaving the desired product as a non-volatile residue. The reaction products can be cross-linked by conventional techniques (e.g. freeradical initiation) to form useful coatings and adhesives. For example, the product produced by heating equal molar amounts of acrylic acid and 2-ethyl-2-oxazoline in benzene gave an ethylenically-unsaturated oligomeric product having a number average molecular weight of 253 and a weight average molecular weight of 460 in approximately 95 percent yield.
    Type: Grant
    Filed: December 30, 1974
    Date of Patent: April 5, 1977
    Assignee: The Dow Chemical Company
    Inventors: Donald A. Tomalia, Bruce P. Thill, Thomas W. Regulski
  • Patent number: 4013480
    Abstract: Novel cellulosic sizing agents are described. They are ring-opened aziridinyl homopolymers of ##EQU1## wherein R.sub.1 and R.sub.2 are hydrogen or lower alkyl; R.sub.3 is hydrogen or methyl; R.sub.4 is an organic hydrophobic group (e.g., C.sub.8 -C.sub.24 alkyl radical); and X is oxygen or amido nitrogen. The above homopolymers can also be blended with cationic starch to form useful sizing compositions. These sizing agents are normally employed as aqueous emulsions. E.g., paper having excellent sizing properties was prepared from a paper pulp containing a mixture of cationic starch and poly[stearyl 3-(1-aziridinyl)propionate].
    Type: Grant
    Filed: January 10, 1974
    Date of Patent: March 22, 1977
    Assignee: The Dow Chemical Company
    Inventors: Lewis E. Chumbley, Lawrence L. Sams, II, Russell T. McFadden, Juan Longoria, III, Donald A. Tomalia, Robert J. Thomas, James W. Lalk
  • Patent number: 4011376
    Abstract: Novel products corresponding to the formula ##STR1## are produced by reacting an allyl halide (e.g., allyl chloride) or a vinylbenzyl halide (e.g., vinylbenzyl chloride) with an oxazoline or an oxazine. The novel compounds are polymerizable monomers and can be used to complex phenols.
    Type: Grant
    Filed: March 3, 1975
    Date of Patent: March 8, 1977
    Assignee: The Dow Chemical Company
    Inventors: Donald A. Tomalia, Elizabeth A. Zubritsky
  • Patent number: 3996237
    Abstract: New esters are described having the formula ##STR1## wherein R is a chemical bond or an inert linking group such as alkylene, oxa-alkylene, thia-alkylene, arylene, alkenylene or the like, R' and R" are H or lower alkyl and n is 2-3. They are made by the reaction of a bis-oxazoline or -oxazine with an equimolar amount of an acrylic acid: ##STR2## The compounds (I) are acrylic esters and are polymerizable and copolymerizable by the same general techniques used with other acrylic esters, thus producing solid resins useful as molding and coating materials. The oxazoline and oxazine rings in such resins are reactive with carboxyl groups; hence, the resins can be mixed with carboxy-containing polymers to form mixtures that readily cure upon mmold heat treatment to form hard, water-resistant and solvent-resistant, infusible resins.
    Type: Grant
    Filed: July 17, 1974
    Date of Patent: December 7, 1976
    Assignee: The Dow Chemical Company
    Inventor: Donald A. Tomalia
  • Patent number: 3996204
    Abstract: Novel N-(m or p-vinylbenzyl)aziridines are disclosed which correspond to the structural formula ##EQU1## wherein R and R' are hydrogen or lower alkyl. They are highly reactive difunctional monomers which can be homopolymerized or copolymerized to form many useful polymers.
    Type: Grant
    Filed: February 19, 1974
    Date of Patent: December 7, 1976
    Assignee: The Dow Chemical Company
    Inventors: Donald A. Tomalia, Jerry D. DeVrieze
  • Patent number: RE29027
    Abstract: This invention concerns linear, curable polymeric materials prepared by reaction of a polyepoxide with an excess of di-2-oxazoline, and to cured products produced therefrom which are particularly suited as self-adherent corrosion and chemical resistant coatings for metals.
    Type: Grant
    Filed: May 2, 1975
    Date of Patent: November 2, 1976
    Assignee: The Dow Chemical Company
    Inventors: John A. Alford, Ben A. Tefertiller, Jr., Donald A. Tomalia