On condensation of the Schiff-base with formaldehyde and
resorcinol, the aromatic ring protons appeared in the range 6.79-7.76 ppm as a multiplet signals and the azomethine proton appeared at 8.46 ppm.
Table 1.--Phenol
resorcinol formaldehyde (PRF) adhesive formula and physical properties.
PCAWDF was mainly composed of HPAM, formaldehyde,
resorcinol, and thiourea.
Carbon aerogels were prepared in which instead of
resorcinol the researchers used the potassium salt of 2,4-dihydroxybenzoic acid (dHBA) in the sol-gel process, producing K+-doped hydrogels.
Mamedov and co-workers studied the oxidation of
resorcinol in an alkaline medium [10].
The results of this robustness study (Table 4) presented the method to be robust for the analysis of
resorcinol from any formulation at a concentration as low as 1.92 [micro]g x [mL.sup.-1] (Table 2).
Available for retailers' store brand programs, the line of natural products contains no ammonia, parabens or
resorcinol. It both deposits and extracts color, adding to the original shade while lightening hair color up to two shades at a time.
Hazardous substances found in the wastes, soils, groundwater and surface water include volatile and semi-volatile organic compounds, metals, sulfonic acids and
resorcinol, a component of adhesive systems.
The 22 endocrine-disrupting substances ChemSec added to the SIN list are: 3-benzylidene camphor, 4-meth-ylbenzylidene camphor, 4-nitrophenol, p-nitrophenol, benzophenone-l, benzophenone-2, benzophenone-3, butyl-paraben, dicyclohexyl phthalate, diethyl phthalate, dihexyl phthalate, ethylhexyl methoxycinnamate, metam natrium, methyl tertiary butyl ether (MTBE), pentachlorophenol, perchloroethylene, propylparaben, quadrosilan,
resorcinol, tert-butylhydroxyanisole (BHA), thiram, and zineb.