Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1982-02-16
1984-05-01
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621643, 1621646, 162169, 162170, 162189, 162191, D21H 332
Patent
active
044459726
ABSTRACT:
A new process for manufacturing sheets made of fibrous material containing latex is characterized in that the pulp containing the fibrous material is prepared in the following way:--adjustment of the pH between 4 and 5.5 and preferably between 4 and 4.5,--addition of an electrolyte, the polarity of which is of the opposite sign to that of the latex used,--addition of a foam inhibitor,--re-adjustment of the pH between 4 and 5.5, if necessary,--addition, preferably by injection, of latex,--second addition of an electrolyte having the same characteristics as indicated above,--possibly addition of resins (phenoplasts or aminoplasts),--re-adjustment of the pH to the previously indicated value, if necessary.
The new sheets obtained by this process find use in the field of paper manufacture.
REFERENCES:
patent: 2601597 (1952-06-01), Daniel et al.
patent: 4274916 (1981-06-01), Grose
Chemical Abstracts, 93:30875b (1980).
Chemical Abstracts, 93:97203z (1980).
Alince, B. et al "Colloidal Aspects of the Retention of Positively Charged Additives" Tappi,vol. 61, No. 11, pp. 111-114 (Nov. 1978).
Chin Peter
Papeteries de Jean d'Heurs
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