| 摘要 |
<p>1. Thickened aqueous acid solutions having an acid concentration by weight lower than, or equal to, 30%, a pH lower than, or equal to 2, and presenting a viscosity higher than 1 millipascal per second as determined at 20 degrees C with a Brookfield viscosimeter, model RVT, equipped with a suitable shaft rotating at the speed of 50 rotations per minute, stable in time, characterised in that they are thickened by the hydrochloric acid salified dimethylaminoethyl methacrylate homopolymer having an intrinsic viscosity of between 4 and 6 dl/g, as determined in a NaCl molar solution at 20 degrees C.</p> |
