Films, preimpregnated tapes and composites made from polyimide "Salt-like" Solutions
Patent 6222007 Issued on April 24, 2001. Estimated Expiration Date: 
May 29, 2018. 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.
May 29, 2018. 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 ReferencesResin impregnation process Moulding of composite materials High temperature stable polyetherimides from oxydiphthalic dianhydride and a mixture of m- and p-phenylene diamines and diaminodiphenyl ether Polyimide film Copolyimide ODPA/BPDA/4,4'-ODA or P-PDA Polyimide molding powder, coating, adhesive and matrix resin Direct process for preparing semi-crystalline polyimides Melt-processible polyimides with high Tg Solvent resistant copolyimide Solutions of polyimide-forming substances and their use as coating compositions Patent #: 5478917 InventorsAssigneeApplicationNo. 093826 filed on 05/29/1998US Classes:528/353, Carboxylic acid contains at least four carboxylic acid groups or is a derivative of a carboxylic acid containing at least four carboxylic groups264/45.1, Composite article making264/165, FORMING CONTINUOUS OR INDEFINITE LENGTH WORK264/170, By chemical additive to molding material or treating bath264/171.1, Layered, stratified traversely of length, or multiphase macrostructure containing material (e.g., conjugate, composite, islands-in-sea, core-sheath, etc.)264/171.21, Producing ribbon, tape, or sheet (e.g., extrusion, etc.)264/331.11, Synthetic resin containing264/331.12, Polymer having heterocyclic group or polymer derived from monomer having heterocyclic group except heterocyclic derived solely from carboxylic acid (i.e., cyclic imide, lactam, lactone, or anhydride)264/331.21, Carboxylic acid or derivative428/395, Polyamide, polyimide or polyester428/411.1, COMPOSITE (NONSTRUCTURAL LAMINATE)428/473.5, Of polyimide528/125, From ketone-containing phenolic reactant or with ketone-containing reactant528/128, With nonphenolic or nonketone 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 reactant528/179, Polymerizing in the presence of a specified material other than a reactant and other than Group IA or Group IIA material as sole metal atom528/188, Reactant contains three or more carboxylic acid groups or is derivative thereof528/220, FROM KETONE OR KETENE REACTANT528/229, Nitrogen-containing reactant contains an amine group528/350From 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 acidExaminersPrimary: Hampton-Hightower, P.International ClassC08G 073/10AbstractHigh quality films, preimpregnated tape (prepegs) and composites have been fabricated from polyimide precursor "salt-like" solutions. These "salt-like" solutions have a low viscosity (5,000 to 10,000 cp) and a high solids content (50-65% by weight) and can be coated onto reinforcing fiber to produce prepegs with excellent tack and drape at 12-15% residual solvent (~4-6% water from thermal imidization reaction). The processing of these types of prepegs significantly overcomes solvent removal problems and allows excellent fiber wet out. In addition, the physical characteristics of the polyimide precursor "salt-like" solutions permits processing into high-performance materials through the use of standard prepregging and composite fabrication equipment. The resultant composites are of high quality.Field of SearchCarboxylic acid contains at least four carboxylic acid groups or is a derivative of a carboxylic acid containing at least four carboxylic groupsFrom ketone-containing phenolic reactant or with ketone-containing reactant With nonphenolic or nonketone reactant Reactant contains three or more carboxylic acid groups or is derivative thereof Polymerizing in the presence of a specified material other than a reactant and other than Group IA or Group IIA material as sole metal atom Nitrogen-containing compound is a reactant other than wherein nitrogen is solely present as a carboxylic acid derivative Carboxylic acid or derivative is a reactant FROM KETONE OR KETENE REACTANT Nitrogen-containing reactant contains an amine group 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 COMPOSITE (NONSTRUCTURAL LAMINATE) Of polyimide Polyamide, polyimide or polyester Synthetic resin containing Polymer having heterocyclic group or polymer derived from monomer having heterocyclic group except heterocyclic derived solely from carboxylic acid (i.e., cyclic imide, lactam, lactone, or anhydride) Carboxylic acid or derivative Composite article making FORMING CONTINUOUS OR INDEFINITE LENGTH WORK By chemical additive to molding material or treating bath Layered, stratified traversely of length, or multiphase macrostructure containing material (e.g., conjugate, composite, islands-in-sea, core-sheath, etc.) Producing ribbon, tape, or sheet (e.g., extrusion, etc.) | |
