Phosphorus-containing flame-retardant hardener, and epoxy...

Details Phosphorus-containing flame-retardant hardener, and epoxy... Phosphorus-containing flame-retardant hardener, and epoxy...

2006-01-31

2006-01-31

Sellers, Robert (Department: 1712)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S481000, C525S485000, C525S486000, C525S496000, C525S497000, C525S504000, C525S523000, C525S533000

Reexamination Certificate

active

06992151

ABSTRACT:
The present invention discloses an active-hydrogen-containing curing agent having a phosphorus group, and a flame retardant cured epoxy resin which can be prepared via an addition reaction between the active hydrogen and the epoxide group of an epoxy resin. The cured flame retardant epoxy resin is environmentally friendly and is suitable for printed circuit board and semiconductor encapsulation applications. The phosphorus group of the curing agent has a chemical structure as follows:wherein Ar is a substituted or un-substituted phenyl or phenoxy.

REFERENCES:
patent: 6180695 (2001-01-01), Ito et al.
patent: 6291626 (2001-09-01), Wang et al.
patent: 63-19254 (1988-01-01), None
patent: 04300968 (1992-10-01), None
Chun-Shan Wang and Jeng-Yueh Shieh, “Synthesis and Properties of Epoxy Resins Containing 2-(6-oxid-6H-dibenz(c,e)(1,2)oxaphosphorin-6-yl)1,4-benzenediol,” Polymer, Nov. 1998, vol. 38, No. 23, pp. 5819-5826.
Chun-Shan Wang and Jeng-Yueh Shieh, “Synthesis and Properties of Epoxy Resins Containing 2-(6-oxid-6H-dibenz(c,e)(1,2) oxaphosphorin-6-yl) 1,4-benzenediol, ” Polymer vol. 39, No. 23, pp. 5819-5826, Nov. 1998.

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