Phosphorus-containing flame-retardant hardener, and epoxy resins cured by the same
AssigneeNational Science Council
InventorsChun-Shan Wang, Jeng-Yueh Shieh
Life of this patent
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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.
Claims14
A cured phosphorus-containing epoxy resin prepared by cross-linking an epoxy resin or an advanced epoxy resin in a molten state of said epoxy resin or an advanced epoxy resin and in the presence of a hardener having a formula selected from the group consisting of (a), (b), (c) and (d):
- wherein
- R1, R2 independently are H, C1~C18 alkyl, C6~C18 aryl, C6~C18 substituted aryl, C6~C18 aryl methylene, or C6~C18 substituted aryl methylene;
- n′=0~11;
- Z=—NH2, —NHR, or —R;
- o=1~3;
- o′=3~10;
- r=0~6;
- R, Q and p are defined as above;
- wherein R is defined as above and n=0–5;
- wherein either all the A or all the A′ in each formula of (a) to (d) are H, and at least one of the A is not H when all the A′ are H in each formula of (a) to (d), and at least one of the A′ is not H when all the A are H in each formula of (a) to (d);
- or a hardener mixture comprising one said hardener having said formula and an additional different hardener for epoxy resin.
Dependencies are inferred from the claim text.