http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-112592476-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_a52af89e67b7b044f04d055c573de211 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G73-22 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G73-22 |
| filingDate | 2020-09-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_66e8e958eb0e0002f258e90cc346d0a2 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_edcfd89ca75658ff3ae44c6ae23ff740 |
| publicationDate | 2021-04-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-112592476-A |
| titleOfInvention | Method for producing polybenzoxazole precursor and polybenzoxazole precursor |
| abstract | The present invention relates to a method for producing a polybenzoxazole precursor and a polybenzoxazole precursor. [Problem] To provide a method for obtaining a polybenzoxazole precursor with a sufficiently reduced residual halogen in good yield while suppressing discharge of waste liquid. [Solution] A method for producing a polybenzoxazole precursor, comprising the steps of: reacting a dicarboxylic acid dihalide and bis(o-aminophenol) in an aprotic polar solvent to obtain polyphenylene The process of the crude product of the oxazole precursor; the obtained crude product of the polybenzoxazole precursor is washed with one or more solvents selected from the group consisting of water and methanol as appropriate, and then dissolved in a primary alcohol ( Among them, the process of obtaining an alcohol solution by adding one or more alcohols among secondary alcohols (except methanol) and secondary alcohols; and adding the obtained alcohol solution to water or an organic acid aqueous solution to precipitate the polybenzoxazole precursor. process. |
| priorityDate | 2019-10-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 94.