| 摘要 |
An amine salt of a partially esterified highly carboxylated polymer is used in a substantially non-polar solvent as a viscosifier for liquid or semi-liquid compositions such as drilling muds, coating compositions etc. A preferred polymer is a co-polymer of maleic anhydride and isobutylene and the ester is preferably formed from a long chain alcohol, the amine salt preferably being formed from a long chain amine. |
