| 摘要 |
<p>Dicarboxylic acids and dicarboxylic acid derivatives which contain an N,N-imidazolidine-4,5-dione ring and have the formula: (I) in which R is alkylene, cyclohexylene, phenylene or benzylene, R1 and R2 each represent hydrogen, alkyl, cycloalkyl or phenyl or together represent C4 to C7 alkylene and X represents carboxyl, nitrite, chlorocarbonyl, phenoxycarbonyl or alkoxycarbonyl, are useful monomers for the manufacture of polymers, in particular polyesters.</p> |
