http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-110128321-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D209-48 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D209-48 |
| filingDate | 2019-05-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2021-02-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2021-02-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-110128321-B |
| titleOfInvention | Preparation method of low-yellowness diether diphthalimide |
| abstract | The invention relates to a preparation method of low-yellowness diether diphthalimide, which comprises the following steps: (A) reacting diphenol with strong base in non-polar solvent to prepare diphenol; (B) performing nucleophilic reaction on the product obtained in the step A and phthalimide in a polar aprotic solvent; (C) and (B) introducing methyl chloride and/or ethyl chloride gas into the system after the reaction is finished to obtain the diether diphthalimide. The invention adopts methyl chloride and/or ethyl chloride gas to react with residual phenolic hydroxyl/phenolate end groups to generate stable alkyl, and solves the problems of yellowing color and easy oxidation yellowing of the diether diphthalimide product in the prior production technology process. |
| priorityDate | 2019-05-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 63.