| 摘要 |
PCT No. PCT/GB95/00231 Sec. 371 Date Oct. 4, 1995 Sec. 102(e) Date Oct. 4, 1995 PCT Filed Feb. 6, 1995 PCT Pub. No. WO95/21295 PCT Pub. Date Aug. 10, 1995During the manufacture of paper from a cellulosic suspension, retention is improved by adding to the suspension a water soluble cationic polymer containing 0.1 to 15 mole % cationic monomer groups and having an intrinsic viscosity of at least 4 dl/g and then adding a substantially water soluble formaldehyde condensate resin. This resin is preferably a phenol sulphone formaldehyde resin. Preferred phenol sulphone formaldehyde resins are materials wherein at last 70 mole % of the recurring groups are dihydroxyl phenyl sulphone groups free of sulphonic acid groups.
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