Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1997-10-27
1999-11-23
Fortuna, Jose
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621641, 1621646, 162166, 162175, 162165, 162178, 524247, 524249, 528157, 528158, C08G 1240, D21H 1751
Patent
active
059893915
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a product obtained by reacting a sulfonated amino resin and an amino group-containing substance, a sol of the product and a process for producing it. The present invention also relates to a papermaking process which comprises sheeting an aqueous papermaking stock containing cellulose fibers or cellulose fiber and an inorganic filler material, followed by removal of water and drying, characterized by use of a product obtained by reacting a sulfonated amino resin and an amino group-containing substance, whereby the retention of cellulose fibers and an inorganic filler material during sheeting is sufficiently improved, and drainage is improved without lowering the strength or the quality of a paper sheet, to improve the production efficiency during sheeting and during drying.
BACKGROUND ART
A zeta potential regulator for papermaking which contains a sulfonic acid group-containing melamine-formaldehyde condensate as an active ingredient is proposed in Japanese Unexamined Patent Publication No. 259699/1985. The publication discloses that the sulfonic acid group-containing melamine-formaldehyde condensate is obtained by condensing 1 part by mol of melamine or a mixture of melamine and another condensable compound, 2 to 4 parts by mol of formaldehyde or an equivalent mols of a formaldehyde donor, and from 0.5 to 2 parts by mol of a bisulfite and a sulfite or an equivalent mols of a bisulfite or sulfite donor in a molar ratio of formaldehyde to the bisulfite or the sulfite of from 4.5:1 to 2:1.
Many sulfonated amino resins have been proposed as water reducing agents for concrete. Japanese Examined Patent Publication No. 13991/1977 proposes an aqueous solution of a sulfonic acid group-containing melamine-formaldehyde condensate obtained by reacting a melamine-urea mixture, formaldehyde and an alkali sulfite in an aqueous solution in a molar ratio of 1:2.7 to 3.2:0.9 to 1.1. Japanese Examined Patent Publication No. 43699/1989 proposes a sulfonic acid group-containing melamine-formaldehyde condensate obtained by condensing melamine, formaldehyde and a sulfite in an aqueous medium in a molar ratio of 1:2.2 to 3.2:0.3 to 1.0.
The above-mentioned sulfonic acid group-containing melamine-formaldehyde condensates are not so effective as a retention aid during sheeting, and have a drawback that it is inferior in slump retention, though they are very effective as a water reducing agent for concrete. The sulfonic acid group-containing melamine-formaldehyde condensates has another drawback that their application and amount are limited because of the remaining free formaldehyde. In addition, it is difficult to obtain a sulfonic acid group-containing melamine-formaldehyde condensate having a high viscosity by the methods disclosed in the above publications.
No report has been made about a product obtained by reacting a sulfonated amino resin and an amino group-containing substance.
The first aspect of the present invention provides a product obtained by reacting a sulfonated amino resin and an amino group-containing substance which solves the above-mentioned drawbacks of prior art and is a novel material useful in many ways, and a process for its production.
The present inventors have found that an amino group-containing substance such as melamine can be easily dissolved in an aqueous solution of a sulfonated amino resin, and accomplished the first aspect of the present invention as a result of extensive researches. Namely, the first aspect of the present invention provides a product obtained by reacting a sulfonated amino resin and an amino group-containing substance which is useful in a wide variety of industries, e.g., as a retention aid in production of paper made mainly of cellulose fibers, or cellulose fibers and inorganic filler materials, as a flocculant in waste water treatment, as a water reducing agent in preparation of hydraulic inorganic materials such as cement and gypsum, as an admixture for the earth pressure shield tunneling method, and as a dispersant for coa
REFERENCES:
patent: 2564925 (1951-08-01), Pollard
patent: 2949396 (1960-08-01), Bonzagni
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patent: 3340237 (1967-09-01), Sellet
patent: 4430469 (1984-02-01), Burge et al.
patent: 5286347 (1994-02-01), Richardson
Ema Kiyomi
Kaneko Michie
Sugiyama Takaichi
Urahata Hisanobu
Watanabe Yoshitane
Fortuna Jose
Nissan Chemical Industries Ltd.
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