초록 ▼

The present invention is directed to polyimide systems which simultaneously offer low toxicity, a high glass transition temperature, excellent thermal oxidative stability, and desirable processing characteristics. These various polyimide systems include mixtures of monomeric reactants, polyimide-pre

The present invention is directed to polyimide systems which simultaneously offer low toxicity, a high glass transition temperature, excellent thermal oxidative stability, and desirable processing characteristics. These various polyimide systems include mixtures of monomeric reactants, polyimide-precursor reaction products, polyimides, and polyimide-containing articles. In one aspect of the invention, the mixture of monomeric reactants includes at least one dia-nhydride or a derivative thereof, and at least one diamine. The diamine may be 4,4'-[1,4-phenylene-bis(1-methylethylidene)]bisaniline, 4,4'-[1,3-phenylene-bis(1-methylethylidene)]bisaniline, and/or a derivative thereof. The diamine also may include a phenylenediamine, 2,2-bis[4-(4-aminophenoxyl)phenyl]propane, 4,4'(1,4-phenylene-bismethylene)bisaniline, and/or a derivative thereof. In addition, the mixture may include a reactive end-capping agent and/or a non-reactive end-capping agent. Also, if desired, the mixture of monomeric reactants may be a dry mix or a solution. The invention also is directed to articles formed from mixtures of monomeric reactants, articles formed from polyimide-precursor reaction products, and articles formed from polyimides themselves. Non-limiting examples include a powder, a neat resin, a coating, a film, a membrane, a foam, an adhesive, a fiber, a composite, a laminate, a prepreg, a part, and a bushing.

대표청구항 ▼

[ What is claimed is:] [1.] A mixture of monomeric reactants, comprising:an aromatic dianhydride or a derivative thereof; anda diamine selected from the group consisting of 4,4'-[1,4-phenylene-bis(1-menthylethylidene)] bisaniline, 4,4-[1,3-phenylene-bis(1-methylethylidene)]bisaniline, a derivative t

[ What is claimed is:] [1.] A mixture of monomeric reactants, comprising:an aromatic dianhydride or a derivative thereof; anda diamine selected from the group consisting of 4,4'-[1,4-phenylene-bis(1-menthylethylidene)] bisaniline, 4,4-[1,3-phenylene-bis(1-methylethylidene)]bisaniline, a derivative thereof, and combinations thereof,with the proviso that the mixture not include more than one type of aromatic dianhydride, the mixture not include a diaminosiloxane, and the mixture not include a diaryl substituted acetylene end-capping agent.