Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Reexamination Certificate
2006-05-09
2006-05-09
Truong, Duc (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
C528S137000, C528S145000, C528S422000, C528S491000, C528S493000, C528S495000, C528S501000, C528S503000
Reexamination Certificate
active
07041772
ABSTRACT:
The present invention discloses a process for producing a benzoxazine resin which comprises the steps of reacting a phenol compound, an aldehyde compound and a primary amine in the presence of an organic solvent to synthesize a benzoxazine resin and removing generated condensation water and the organic solvent from a system under heating and a reduced pressure, wherein a pressure in the reaction system at the time of removal is set to 260 mmHg or higher.
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Ning, et al., “Phenolic Materials via Ring-Opening Polymerization: Synthesis and Characterization of Bisphenol-A Based Benzoxazines and Their Polymers”, Journal of Polymer Science: Part A: Polymer Chemistry, 1994, vol. 32, pp. 1121-1129.
Aizawa Teruki
Hirai Yasuyuki
Numata Syunichi
Hitachi Chemical Co. Ltd.
Truong Duc
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