Abstract: A reflector includes a base body exhibiting dielectric property at least at its surface. A reflecting layer made of aluminum is formed on one surface of the base body by vacuum deposition. A light-transmitting water-insoluble inorganic oxide layer is formed on the aluminum reflecting layer. The light-transmitting inorganic oxide layer has its micropores sealed by sealing agent comprising H.sub.2 O or a carboxylate of an iron family element having a low valence.

Abstract: A reflector includes a base body made of a metallic material having substantially the same ionization potential as that of aluminum. A reflecting layer made of aluminum is formed over one surface of the base body by vacuum deposition. A light-transmitting water-insoluble inorganic oxide layer is formed on the aluminum reflecting layer. The light-transmitting inorganic oxide layer has its micropores sealed by H.sub.2 O a carboxylate of an iron family element having a low valence.

Abstract: A reflector has a base body which is made of a metallic material having an ionization potential substantially higher than that of aluminum. An aluminum reflecting layer is formed on one surface of the base body by vacuum deposition. Furthermore, a light-transmitting water-insoluble inorganic oxide layer is formed on the aluminum reflecting layer. The light-transmitting inorganic oxide layer has its micropores sealed by H.sub.2 O or a carboxylate of an iron family element having a low valence. An insulating layer is formed to cover at least the other surface and the peripheral side of the base body.

Abstract: A urea compound having carboxylate radical is obtained by reaction of aminoaminocarboxylate represented by the formula: ##STR1## (where R.sub.1 l is a hydrocarbon-based radical, and R.sub.2 is ethylene radical or a substituted ethylene radical) with diisocyanate, optionally in the presence of diamine and/or water. The reaction may be achieved by interfacial polymerization, solution polymerization, or solvent-free polymerization.