| 摘要 |
The present invention concerns a water-soluble polymer in bead or powder form, characterised in that it has a Brookfield viscosity greater than 100 cps, and in that it is obtained by inverse suspension or inverse emulsion polymerisation, in the presence of a transfer agent, of monomers of which less than 20 mol% consist of a hydroxyalkyl monomer of formula H2C=CR1R2, R1 being a hydrogen atom or a methyl group and R2 being a hydrocarbon group containing at least one OH pendant group or at least one epoxide group and optionally at least one N or O heteroatom in the hydrocarbon chain; R2 being different from the C(=O)-OH group. |
