Low toxicity high temperature PMR polyimide
Patent 5171822 Issued on December 15, 1992. Estimated Expiration Date: 
February 5, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 5, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesProcess for forming end-capped polyamic acids polyimides 5015727 InventorAssigneeApplicationNo. 651062 filed on 02/05/1991US Classes:528/188, Reactant contains three or more carboxylic acid groups or is derivative thereof528/125, From ketone-containing phenolic reactant or with ketone-containing reactant528/126, Polymerizing in the presence of a specified material other than reactant528/128, With nonphenolic or nonketone reactant528/170, Imide-containing reactant528/172, Nitrogen-containing compound is a reactant other than wherein nitrogen is solely present as a carboxylic acid derivative528/173, Carboxylic acid or derivative is a reactant528/176, With polycarboxylic acid or derivative as reactant528/183, Nitrogen reactant contains at least one amino-nitrogen atom528/185, Phenolic reactant contains at least two aryl rings and two diverse phenolic to oxygen bonds528/220, FROM KETONE OR KETENE REACTANT528/229, Nitrogen-containing reactant contains an amine group528/350, From carboxylic acid having three or more carboxylic acid groups or derivatives thereof, and an organic amine, or from an organic amine salt of a tri-or higher carboxylic acid528/351, Polymerizing in the presence of a specified material other than a reactant528/353Carboxylic acid contains at least four carboxylic acid groups or is a derivative of a carboxylic acid containing at least four carboxylic groupsExaminersPrimary: Kight, III, JohnAssistant: Hampton-Hightower, P. Attorney, Agent or FirmInternational ClassesC08G 073/10C08G 008/02 C08G 069/26 AbstractAn improved low toxicity polymerization of monomer reactants (PMR) system has 3,4'-oxydianiline as the key monomer reactant. One variation of this system, LaRC-RP46, is prepared by reacting together monomethyl ester or 5-norbornene-2,3-dicarboxylic acid (NE), 3,4'-oxydianiline (3,4'-ODA), and dimethyl ester of 3,3',4,4'-benzophenonetetracarboxylic acid (BTDE); this combination is then treated with heat. This new matrix resin is readily processed into a high quality graphite fiber reinforced composite with excellent reproducibility. The flexibility of the ether linkage in 3,4'-ODA provides high toughness. The composite retains excellent mechanical properties both at 316° C. and at 371° C. The development of LaRC-RP46 will significantly extend the applications of PMR type polyimides.Field of SearchReactant contains three or more carboxylic acid groups or is derivative thereofNitrogen reactant contains at least one amino-nitrogen atom Phenolic reactant contains at least two aryl rings and two diverse phenolic to oxygen bonds From ketone-containing phenolic reactant or with ketone-containing reactant Polymerizing in the presence of a specified material other than reactant With nonphenolic or nonketone reactant Carboxylic acid or derivative is a reactant Nitrogen-containing compound is a reactant other than wherein nitrogen is solely present as a carboxylic acid derivative Imide-containing reactant With polycarboxylic acid or derivative as reactant FROM KETONE OR KETENE REACTANT Nitrogen-containing reactant contains an amine group Polymerizing in the presence of a specified material other than a reactant From carboxylic acid having three or more carboxylic acid groups or derivatives thereof, and an organic amine, or from an organic amine salt of a tri-or higher carboxylic acid Carboxylic acid contains at least four carboxylic acid groups or is a derivative of a carboxylic acid containing at least four carboxylic groups | |
