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  • 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 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 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 4118377 B2
    Description:

    Processes for increasing the molecular weight of bis-maleimides are provided. The bis-maleimides are reacted with certain cyclic dienes to form reversible adducts. These adducts, upon elimination of the cyclic diene, yield an extension of the bis-maleimides to higher molecular weight polymers, ultimately to thermally stable, infusible polymers. The process can be interrupted to yield tractable polymers which are also convertible to cross-linked, infusible products. Modifications of the proces…

    Date Issued:
    1978-10-03
    Resource Type
    Patent
  • Inventor(s):
    Gaetano Francis D'Alelio
    Patent Number:
    US 4075171 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, at least one aromatic diamine and an .alpha.,.beta.-carboxylic acid monoanhydride 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 w…

    Date Issued:
    1978-02-21
    Resource Type
    Patent
  • Inventor(s):
    Gaetano Francis D'Alelio
    Patent Number:
    US 4060515 B2
    Description:

    Aromatic polyimides with nitrile end groups are chain-extended (molecular weight increased) by polymerization using Lewis acid salts as catalyst. Molecular weights are increased with little or no by-product formation. These polyimides can be shaped and formed prior to the polymerization. The aromatic polyimides appropriate for chain-extending are formed by the reaction of aromatic dianhydrides, aromatic diamines and nitrile compounds such as aminobenzyl cyanide and aminobenzonitrile.

    Date Issued:
    1977-11-29
    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 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 3639348 B2
    Description:

    The copolymers disclosed herein are of propargyl acrylate and methacrylate. Polymerization of propargyl acrylate and methacrylate in free radical systems generally results in crosslinked or gelled products since the free radicals will activate polymerization through the acetylenic as well as through the acrylic unsaturation. Therefore the copolymers are advantageously prepared byanionic polymerization. The comonomers are those which are copolymerizable with acrylates and methacrylates inanion…

    Date Issued:
    1972-02-01
    Resource Type
    Patent
  • Inventor(s):
    Gaetano Francis D'Alelio
    Patent Number:
    US 3562230 B2
    Description:

    The process disclosed herein involves the bromination of copolymers of non-terminal acetylenic methacrylates and the brominated products produced thereby. Acetylenic methacrylate polymers upon dibromination of the acetylene group give ethylenic dibromo derivatives which are hydrolytically stable. In comparison the derivative obtained upon dibromination of a polymer of allyl methacrylate has dibromopropyl methacrylate repeating units which are susceptible to hydrolysis of the bromine. Thus whe…

    Date Issued:
    1971-02-09
    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 4058505 B2
    Description:

    Aromatic polyimides with amine end groups are chain-extended (molecular weight increased) by reacting them with aromatic di- or tri- anhydrides. The reaction can either be at a temperature above the melting point of the reactants or in solvents for the reactants. The polyimides can be shaped and formed prior to chain-extending.

    Date Issued:
    1977-11-15
    Resource Type
    Patent