Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With non-fiber material added to product
Patent
1981-05-21
1982-08-31
Smith, William F.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With non-fiber material added to product
162 11, 162 24, 162 26, 162 28, 162 71, 162 72, 162 76, 162158, 1621643, 1621646, 162166, 1621683, 162175, D21B 116
Patent
active
043471005
ABSTRACT:
An additive comprising an anionic organic surface active agent is incorporated into mechanical or thermomechanical pulp at an elevated temperature and pressure. The additive causes dispersion of lignin and retards redeposition of lignin so that the bursting strength of the paper formed from the pulp is improved. The preferred additives are higher molecular weight anionic organic polyelectrolytes or polymers, particularly polymeric sulfonates. Further improvement in bursting strength is achieved by the wet end addition of a cationic organic polyelectrolyte or polymer, with or without starch. Lower molecular weight anionic organic detergents can also be used but should be rinsed from the pulp before forming paper.
REFERENCES:
patent: 1983008 (1934-12-01), Snyder
patent: 1991335 (1935-02-01), Reddish
patent: 2072487 (1937-03-01), Snyder
patent: 2197463 (1940-04-01), Bradner
patent: 2668110 (1954-02-01), Spencer
patent: 3597310 (1971-08-01), Sumi et al.
patent: 3773610 (1973-11-01), Shouvlin et al.
patent: 3819470 (1974-06-01), Shaw et al.
patent: 3839215 (1974-10-01), Mulders
patent: 4062721 (1977-12-01), Guyer et al.
patent: 4145246 (1979-03-01), Goheen et al.
patent: 4152199 (1979-05-01), Hamerstrand et al.
Schwartz et al., "Surface Active Agents & Detergents", vol. II, pp. 155-159 (1958).
Smith William F.
The Chemithon Corporation
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