SOLPIT INDUSTRIES, LTD. Patent applications |
Patent application number | Title | Published |
20130018167 | Solvent-Soluble 6,6-Polyimide Copolymers and Processes for Preparing ThemAANM Itatani; HiroshiAACI Ushiku-shiAACO JPAAGP Itatani; Hiroshi Ushiku-shi JP - Heat-resistant polyimide copolymers having the following four components: pyromellitic dianhydride (PMDA), 1,4-diaminodiphenyl ether (DADE), biphenyltetracarboxylic dianhydride (BPDA), and 2,4-diaminotoluene (DAT) are provided. In an embodiment the molar ratio of (BPDA):(DADE):(PMDA):(DAT) is 2:2:m:m, in which m is an integer of 3, 4 or 5. | 01-17-2013 |
20100273955 | 6,6-Polyimide Copolymers and Processes for Preparing Them - The present invention provides a process for preparing a solvent-soluble polyimide copolymer synthesized from a 6,6-imide segment having an imide oligomer with PMDA at both ends produced by adding 4 molar equivalents of pyromellitic dianhydride (PMDA) and 2 molar equivalents of diaminotoluene (DAT) to an imide oligomer produced by heating 1 molar equivalent of biphenyltetracarboxylic dianhydride (BPDA) and 2 molar equivalents of diaminodiphenyl ether (DADE) at 160-200° C. in the presence of a catalyst in an organic polar solvent. | 10-28-2010 |