Reaction equation
[CH2:1]=[O:2].[NH2:3][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.[CH3:10]OCC(O)C>>[O:2]1[C:1]2[CH:10]=[CH:5][CH:6]=[CH:7][C:8]=2[CH:9]=[CH:4][NH:3]1Participants
Conditions
- Temperature
- 105 °C
Procedure
The steps include: in a 2 L four-necked glass reactor equipped with a heating mantle, a temperature controller, an electric mixer and a condenser, 350 g of phenolic resin (C) having high proportion of tri-functional resin monomer and 246 g of paraformaldehyde are dissolved thoroughly in the presence of 816 g of a solvent propylene glycol monomethyl ether at 85° C., 334.4 g of aniline is dropped in the course of 3 hours into the reactor at constant speed by a quantitative pump to proceed the reaction at 85° C. After finishing the dropping addition of aniline, the temperature is kept at 85° C. for aging for 2 hours, then the temperature is raised to 105° C. After water and part of the solvent are removed, a benzoxazine resin solution with 56 wt % solid is obtained. According to gel permeation chromatography (GPC) analysis, the proportion of the tri-functional resin monomer in this benzoxazine resin is up to 60 area percent (Area %) or more.
Workup
- customin a 2 L four-necked glass reactor equipped with a heating mantle
- customthe reaction at 85° C
- customis kept at 85° C.
- customAfter water and part of the solvent are removed
Sources & evidence
- ORD record
- ord-8ac4833d2bde4918a670d509dbef6cb0
- Source dataset
- uspto-grants-2013_09
- Patent number
- US08536283B2
Linked notes
Loading…