Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1990-10-16
1993-03-02
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621641, 1621681, 162179, D21H 1715
Patent
active
051906163
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to self-emulsifying sizing agents, which are particularly able to have long shelf stability and easily formable emulsifiable liquid by mixing water.
BACKGROUND ART
As a reactive sizing agent which is usable for paper industry, alkenylsuccinic anhydrides and ketene dimers are known ("Pulp and Chemistry and Chemical Technology" Third Edition, JOHN WILEY & SONS, Inc. NEW YORK (1981).
.alpha.-Olefin-maleic anhydride copolymers are also disclosed in Japanese Patent Publication No. 62-25798/1987.
As emulsifying agents, addition products of ethylene oxides to higher alcohols, alkylphenols, higher fatty acids or the like. (Oil chemistry, vol. 10, p.282 (1961) are usually used, and these addition products have free hydroxyl groups.
As a treating agent for sizing paper, an emulsifiable liquid which is obtained by mixing a sizing agent and an emulsifying agent and then by mixing the mixture and water is usable.
Accordingly, if a mixture of a sizing agent and an emulsifying agent has long shelf stability, it is conveniently usable for sizing paper. However, since the conventional emulsifying agent has free hydroxyl groups, there are problems that the emulsifying agent and the sizing agent are reacted and the sizing effect is lowered during the mixture is preserved.
Furthermore, since the conventional sizing agent has remarkable hydrophobic nature, it is required to emulsify the sizing agent with an emulsifying agent. The emulsifying agent has hydrophilic nature, so that the mixture of the sizing agent and the emulsifying agent often shows insufficient sizing effect.
An object of the present invention is to provide sizing agents which are easily emulsifiable by mixing water, which have excellent sizing effect, long shelf stability and little lowered sizing effect.
Another object of the present invention is to provide emulsifying agents which have long shelf stability even if the emulsifying agents are mixed with conventional alkenylsuccinic anhydrides or ketene dimers, and have little lowered sizing effect during the mixtures are preserved.
DISCLOSURE OF INVENTION
The inventors of the present invention earnestly studied and they found that copolymers of polyoxyalkylene alkenyl ethers having a specific structure and maleic anhydride are stable and self-emulsifiable and have excellent sizing effect. Further, they found that the copolymers act so as to emulsify alkenylsuccinic anhydrides or ketene dimers which have used as sizing agents, and that the copolymers have good stability even if they are mixed with alkenylsuccinic anhydrides or ketene dimers, because there is no reaction between the copolymers and the sizing agents.
Namely, the present invention resides in a self-emulsifying sizing agent which comprises a copolymer of polyoxyalkylene alkenyl ether and maleic anhydride, the polyoxyalkylene alkenyl ether being represented by the general formula (1): ##STR1## wherein Z is a residue of compounds having 2-8 hydroxy groups, AO is one or more oxyalkylene groups of 2-18 carbon atoms, however, the bond may be under a random or blocking condition when AO is two oxyalkylene groups or more, R is an alkenyl group of 2-5 carbon atoms, R.sup.1 is a hydrocarbon or an acyl group of 1-24 carbon atoms, a.gtoreq.0, b.gtoreq.0, c.gtoreq.0, l=1-2, m=0-7, 0 .ltoreq.n/(l+m+n).ltoreq.1/3, al+bm+cn=1-500 and l+m+n=2-8.
In the general formula (1), as the compounds having 2-8 hydroxy groups in which Z is a residue, glycols such as ethylene glycol, propylene glycol, butylene glycol, hexylene glycol, styrene glycol, alkylene glycol of 8-18 carbon atoms, and neopentyl glycol, polyols such as glycerin, diglycerin, polyglycerin, trimethyrolethane, trimethyrolpropane, 1,3,5-pentanetriol, erythritol, pentaerythritol, dipentaerythritol, sorbitol, sorbitan, sorbide, a condensate of sorbitol and glycerin, adonitol, arabitol, xylitol, mannitol, or their partially etherified compounds or their partially esterified compounds, sugars such as xylose, arabinose, ribose, ramnose, glucose, fructose, galac
REFERENCES:
patent: 4529447 (1985-07-01), Okada et al.
patent: 4946904 (1990-08-01), Akimoto et al.
patent: 4946918 (1990-08-01), Akiyama et al.
Akimoto Shin-ichi
Honda Susumu
Takahashi Fujio
Takahashi Hideki
Yasukohchi Tohru
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