Method for producing paper with a high substance weight
First Claim
1. A process for producing paper of high basis weight comprising draining a paper pulp comprising waste paper on a wire in the presence of a combination of at least two polymers as a retention and drainage aid system, forming sheets, and drying the sheets, which comprises forming the sheets in the absence of finely divided inorganic flocculants and in the presence of retention and drainage aids comprising (a) at least one amino-containing polymer and (b) at least one branched cationic polyacrylamide having an ionic regain of >
- 20%wherein the basis weight of the paper is at least 300 g/m2 andwherein the amino-containing polymer is a polyethylenimine or a modified polyethylenimine.
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Accused Products
Abstract
A process for producing paper of high basis weight by draining a paper pulp on a wire in the presence of a combination of at least two polymers as a retention and drainage aid system, forming sheets, and drying the sheets, which comprises forming the sheets in the absence of finely divided inorganic flocculants and using as retention and drainage aids
(a) at least one amino-containing polymer
and
(b) at least one branched cationic polyacrylamide.
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Citations
11 Claims
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1. A process for producing paper of high basis weight comprising draining a paper pulp comprising waste paper on a wire in the presence of a combination of at least two polymers as a retention and drainage aid system, forming sheets, and drying the sheets, which comprises forming the sheets in the absence of finely divided inorganic flocculants and in the presence of retention and drainage aids comprising (a) at least one amino-containing polymer and (b) at least one branched cationic polyacrylamide having an ionic regain of >
- 20%
wherein the basis weight of the paper is at least 300 g/m2 and wherein the amino-containing polymer is a polyethylenimine or a modified polyethylenimine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- 20%
Specification