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Silica sols and use of the sols
| Details |
Inventors: Andersson, Kjell; Larsson, Bo; Lindgren, Erik;
Assignee: Eka Nobel, AB (Bohus, SE)
Primary Examiner: Chin; Peter
Assistant Examiner:
Attorney, Agent or Firm: Mancini; Ralph J., Morris; Louis A.
Silica sols with a high content of microgel and particles with a specific surface area within the range 300 to 700 m.sup.2 /g, preferably 400 to 650 m.sup.2 /g. The sols can be prepared by acidification or a water glass solution and alkalization at a certain dry content, alternatively to a certain pH. The sols are particularly suitable for use as additives in papermaking in combination with cationic polymers and especially in combination with cationic acrylamide based polymers. |
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DETAILED DESCRIPTION We claim: 1.
Silica sols having an S-value within the range from 15 to 40 percent comprising anionic silica particles, said silica particles being non-aluminum modified, and having a specific surface area within the range of from 300 to 700 m.
sup.
2/ g.
2.
The silica sols of claim 1 wherein the silica particles have a specific surface area within the range of from 400 to 650 m.
sup.
2/ g.
3.
The silica sols of claim 1 wherein the sol has an S-value within the range of from 15 to 35 percent.
4.
The silica sols of claim 1, wherein the sols have a dry content, calculated as SiO.
sub.
2, of from 5 to 30 percent by weight.
5.
A process for the production of paper, which comprises: (a) providing a suspension containing cellulose fibers, and optional fillers; (b) adding to said suspension a cationic or amphoteric polymer retention and/or dewatering aid, said polymer being added in an amount of at least 0.
01 kg/ton, based on dry fibers and optional fillers; (c) adding to said suspension a silica sol comprising anionic silica particles, said silica particles being non-aluminum modified and having a specific surface area within the range of from 300 to 700 m.
sup.
2 /g, said silica sol having an S-value within the range of from 15 to 40 percent, wherein said silica sol is added to the suspension in an amount of at least 0.
01 kg/ton, calculated as SiO.
sub.
2 on dry fibers and optional fillers; and (d) thereafter forming and dewatering the obtained suspension on a wire to form paper.
6.
The process of claim 5 wherein the silica sol particles have a specific surface area within the range from 400 to 650 m.
sup.
2 /g.
7.
The process of claim 5, wherein the sol has an S-value within the range of form 15 to 35 percent.
8.
The process of claim 5, wherein said polymer is a cationic acrylamide based polymer.
9.
Silica sols having an S-value within the range of from 15 to 40 percent comprising anionic silica particles, said silica particles being aluminum modified and having a specific surface area within the range of from 300 to 700 m
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Manufacturing Materials 
