| 摘要 |
Polyvinyl chloride is stabilized by a mixture of a urea and an aminocrotonic acid ester. Preferred ureas are urea, N,N-dimethylurea and thiourea. The preferred acid esters are methyl, ethyl, isopropyl, butyl, octyl and dodecyl aminocrotonate. Each of the substances may be added in an amount of from 0,02 to 2% by weight of the mixture. The preferred ratio of ester/urea is 1:2. Other ingredients may be added. |
