Chemistry and Biochemistry

Search CurateND

Search criteria:

Department or Unit: Chemistry and Biochemistry remove ×
Clear all

List of files deposited in CurateND that match your search criteria

  • Inventor(s):
    Gaetano Francis D'Alelio
    Patent Number:
    US 5290908 B2
    Description:

    Aromatic polyimides with acetylenic end groups are cured by coupling together thermally or catalytically using cuprous salts as catalysts to increase molecular weight with little or no by-product formation. These polyimides can be shaped and formed prior to the coupling. The acetylenic end-capped aromatic polyimides are formed by the reaction of an aromatic dianhydride, an acetylenic organic monoamine compound which will provide the reactive end groups and optionally an aromatic diamine.

    Date Issued:
    1994-03-01
    Resource Type
    Patent
  • Inventor(s):
    Gaetano Francis D'Alelio
    Patent Number:
    US 3998786 B2
    Description:

    A process for preparing substantially completely cyclized aromatic polyimides, either monomeric, oligomeric or polymeric, is provided. The process involved the reaction of a mixture of at least one tetracarboxylic acid dianhydride and at least one aromatic diamine in at least one aromatic phenol, preferably cresols, in the presence of an organic azeotroping agent such as a cyclic hydrocarbon, preferably benzene, until substantially all of the water of reaction is eliminated. Other monomers, e…

    Date Issued:
    1976-12-21
    Resource Type
    Patent
  • Inventor(s):
    Gaetano Francis D'Alelio
    Patent Number:
    US 4197397 B2
    Description:

    Aromatic polyimides with anhydride end groups are chain-extended (molecular weight increased) by reacting them with aromatic diamines or diamine terminated imide oligomers. The reaction can either be at a temperature above the melting point of the reactants or in solvents for the reactants. These polyimides can be shaped and formed prior to chain-extending.

    Date Issued:
    1980-04-08
    Resource Type
    Patent
  • Inventor(s):
    Gaetano Francis D'Alelio
    Patent Number:
    US 4537947 B2
    Description:

    Aromatic polyimides with various functional end-groups such as –CH.dbd.CH.sub.2, –C.tbd.CH, –CN and –CHO are chain-extended (molecular weight increased) by reacting the functional groups with aromatic bis-dipoles. A representative bis-dipole is 1,4-benzene-dinitrile oxide. These polyimides can be shaped and formed prior to chain extending. The aromatic polyimides appropriate for chain-extending are formed by the reaction of aromatic dianhydrides, aromatic amines and monoamines which conta…

    Date Issued:
    1985-08-27
    Resource Type
    Patent
  • Inventor(s):
    Gaetano Francis D'Alelio
    Patent Number:
    US 4026833 B2
    Description:

    Aromatic polyimides with anhydride end groups are chain-extended (molecular weight increased) by reacting them with aromatic polyisocyanates such as tolylene-2,4-diisocyanate. These polyimides can be shaped and formed prior to chain-extending. Thermally stable, polyimide foams are formed by the reaction. The aromatic polyimides appropriate for chain-extending are formed by the reaction of aromatic diamines with a molar excess of aromatic dianhydrides.

    Date Issued:
    1977-05-31
    Resource Type
    Patent
  • Inventor(s):
    Gaetano Francis D'Alelio
    Patent Number:
    US 3897395 B2
    Description:

    Aromatic polyimides with reactive end groups are cured by coupling together by addition or condensation to increase molecular weight with little or no by-product formation. These polyimides can be shaped and formed prior to the coupling. The aromatic polyimides appropriate for coupling are formed by the reaction of an aromatic dianhydride and an aromatic diamine in ratios to provide the appropriate end groups, or by including in the reaction mixture a compound which will provide reactive end …

    Date Issued:
    1975-07-29
    Resource Type
    Patent
  • Inventor(s):
    Gaetano Francis D'Alelio
    Patent Number:
    US 3996196 B2
    Description:

    Polyimide-metallo-phthalocyanines and processes for their preparation are provided. The products have the structural formula: ##STR1## where R’ is an aromatic organic radical, the two carbon atoms attached thereto being attached to separate and adjacent carbon atoms in the aromatic radical, M is derived from a polyvalent metal or its salt, said polyvalent metal having an atomic number of at least 12 and G is an aromatic imide of the formula: ##STR2## WHEREIN Ar is a divalent aromatic orga…

    Date Issued:
    1976-12-07
    Resource Type
    Patent
  • Inventor(s):
    Gaetano Francis D'Alelio
    Patent Number:
    US 3562218 B2
    Description:

    The copolymers disclosed herein are of acetylenic acrylates and methacrylates having the formula CH2=C®C)) -Z CECH wherein R represents hydrogen or methyl and Z represents a divalent hydrocarbon radical of at least 2 carbon atoms. Polymerization of the acetylenic acrylates and methacrylates in free radical polymerizations generally result in crosslinked or gelled products since the free radicals will activate polymerization through the acetylenic as well as through the acrylic unsaturation….

    Date Issued:
    1971-02-09
    Resource Type
    Patent
  • Inventor(s):
    Gaetano Francis D'Alelio
    Patent Number:
    US 3562236 B2
    Description:

    The compounds disclosed herein are acetylenic methacrylates having the formula

    CH2 = C(CH3)COO-Z-C=CH

    wherein Z represents a divalent hydrocarbon radical having at least 2 carbon atoms. Because of their terminal acetylenic radical these compounds are very reactive and capable of producing various acetylenic derivatives. Moreover, the methyl group in the methacrylate portion of the ester gives this compound much greater stability than possessed by the corresponding acrylates. This stability…

    Date Issued:
    1971-02-09
    Resource Type
    Patent