Phosphorus Flame Retardants for Polymeric Materials from Gallic Acid and Other Naturally Occurring Multihydroxybenzoic Acids

Table 8

Flammability characteristics for blends of phosphorus esters of methyl 3,5-dihydroxybenzoate with DGEBA epoxy.

Compound	% phosphorus	PHRR (W/g)	THR (kJ/g)	LOI (% O2)	UL 94 rating	% additive
Epoxy	0%	677.7	29.8	19	NR	0
35DHB-DEP	1%	470.9	25.7	23.6	NR	7.1
	2%	348.7	18.9	23.4	NR	14.2
35DHB-DPP	1%	505.4	23.3	24.6	NR	10.2
	2%	330.1	20.1	24.6	NR	20.4
35DHB-DOPO	1%	620.3	22.5	30.8	NR	9.6
	2%	518.8	22.6	33.3	V2	19.2