Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1987-08-19
1988-06-14
Nielsen, Earl
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
525507, 5253592, 528405, 528 99, 549517, C08G 5906
Patent
active
047512806
ABSTRACT:
Epoxy resins are prepared by (a) adding an alkali metal hydroxide solution to a mixture containing an excess of an epihalohydrin, a phenolic hydroxyl-containing or an aromatic amine-containing compound and an organic solvent which codistills with water and the epihalohydrin, (b) conducting the reaction under reduced pressure while continuously removing water by codistillation, (c) separating the water from the distillate and returning the epihalohydrin and organic solvent to the reaction mixture, (d) drying the reaction mixture, (e) removing insoluble materials by suitable mechanical separation means, (f) washing the resin/epihalohydrin/organic solvent mixture with water so as to substantially remove water soluble materials, (g) drying the epihalohydrin/resin mixture, and (h) recovering the resultant epoxy resin from the resin/epihalohydrin/organic solvent mixture by any suitable means. This process produces an epoxy resin which is low in hydrolyzable halide and total halide.
REFERENCES:
patent: 3145191 (1964-08-01), Perfetti
patent: 3876615 (1975-04-01), Vargin et al.
patent: 4132718 (1979-01-01), Vargin et al.
patent: 4499255 (1985-02-01), Wang et al.
Gammill Benny B.
Pham Ha Q.
Krass Frederick
Nielsen Earl
The Dow Chemical Company
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