| 摘要 |
Thermally stable polyurethanes contg. polyurethane elastomer, solvent (DMF) and a small amt. (0.01-3 wt.% based on elastomer) of (cyclo)aliphatic aromatic cpds. and (cyclo)aliphatic diamines, contg. a carboxyl grp. The additive contg. >=1 COOH is X-Y (where X is H, COOH, or where R is 1-12C aliphatic, 5-8C cycloaliphatic, 6-14C aromatic, 1-24C aliphatic diamine, 5-8C cycloaliphatic diamine; R1, R2, R3 are H, OH, COOH, CH2COOH or 1-24C alkyl or 6-14C aromatic; and Y is COOH, CH2COOH or). The solns. are more stable on storage at high temp. |
