| PATENT ASSIGNEE'S COUNTRY | UK |
| UPDATE | 09.99 |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT CLAIMS |
(1) Flocculating cellulosic suspension with a water soluble cationic first polymer retention aid to form cellulosic flocs (2) Mechanically degrading the flocs (3) Reflocculating the suspension by adding a soln of a water soluble anionic second polymeric retention aid made by polymn water soluble anionic ethylenically unsaturated monomer charge under polymn conditions (4) Forming a sheet by draining the reflocculated suspension (5) Drying the sheet characterised in that the water soluble anionic polymeric retention aid (a) Is a branched water soluble polymer made by including branching agent in the monomer charge (b) Has intrinsic visc. > 3 dl/g (c) Has a tan delta rheological oscillation value on a 1.5% soln at 0.005 Hz of > 0.5, or has a deionised SLV visc. number > 3 times the salted SLV visc. number of the polymer made under the same polymn conditions from the same monomer charge in the absence of branching agent |
| PATENT PHOTOCOPY | Available on request |
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