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US 4,366,302 AGranted
Imide-anhydrides and epoxy resin systems containing such compounds
AssigneeLord Corporation
InventorsRaj N. Gounder, John T. Geary
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AssigneeLord Corporation
InventorsRaj N. Gounder, John T. Geary
Estimating the term…
Imide-anhydrides having the structure ##STR1## wherein 1 and 2 are certain cycloaliphatic or aromatic groups and Z is selected from certain imide-anhydride and other substituents have been found to provide cured epoxy resin systems characterized by high temperature stability and excellent mechanical and physical properties.
A room temperature-stable two-pack epoxy resin system consisting essentially of
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
In which the condensed system contains two hetero rings: ortho-condensed systems
Nitrogen containing compounds: imines; Imides
Heterocyclic compounds
Macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds
Term ended 15 Jun 2001 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
This invention relates to epoxy resin compositions. More particularly, the invention relates to epoxy resin compositions which are curable at ambient temperatures to afford products having useful properties at high temperatures.
2. Description of the Prior Art
The following examples will serve to illustrate the invention. Unless otherwise noted, all amounts are in parts by weight.
Cyclobutane tetracarboxylicdianhydride (CBTCDA) is reacted with para-phenylenediamine (PPDA) in a mole ratio of 2:1 according to the following procedure:
A solution of PPDA in dimethylformide (DMF) was introduced dropwise into a solution of CBTCDA at room temperature after four hours, a dark brown solid amide-acid precipitate is formed having the structure: ##STR11## A mixture containing pyridine and acetic anhydride in a weight ratio of 3:2 is added to the amide-acid reaction product (B) and the temperature is raised to 80.degree. C. The amide acid (B) is thus condensed to the imide anhydride (A). The imide anhydride (A) obtained is in solution and is separated by distilling off the solvents and drying in an air-circulated oven.