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US 6,646,064 B2Granted
Reacting epoxy resin with p-containing dihydric phenol or naphthol
AssigneeNational Science Council
InventorsChun-Shan Wang, Jeng-Yueh Shieh
Life of this patent
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Abstract
A method for imparting flame retardance to an epoxy resin comprises reacting an epoxy resin with a phosphorus-containing dihydric phenol or naphthol derived from the reaction of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (i.e., DOPO) with a benzoquinone or naphthoquinone.
Claims5
A method for improving flame-retardant properties and flexural strength of an epoxy resin comprising reacting said epoxy resin with a phosphorus-containing dihydric phenol or naphthol having the following formula (III):
- wherein
- wherein R1 is hydrogen or C1-4 hydrocarbon group, in which an epoxide group of said epoxy resin is reacted with a hydroxyl group of said phosphorus-containing dihydric phenol or naphthol so that an open ring reaction of said epoxide group is carried out.
Dependencies are inferred from the claim text.