Compositions: coating or plastic – Coating or plastic compositions – O-containing organic compound
Patent
1998-05-04
1999-12-14
Nutter, Nathan M.
Compositions: coating or plastic
Coating or plastic compositions
O-containing organic compound
106213, 106243, 162158, 162175, 524 47, 524 65, D21H 1717, D21H 1723, D21H 1729, D21H 1772, D21H 2116
Patent
active
060011661
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to aqueous alkyldiketene dispersions comprising an alkyldiketene, cationic starch and anionic dispersants, and to the use of the aqueous alkyldiketene dispersions as body size in the manufacture of paper, paperboard and cardboard and also for making cellulose fibers hydrophobic.
2. Description of the Background
EP-B-0 353 212 discloses sizes in the form of aqueous emulsions comprising a hydrophobic cellulose-reactive size, e.g. fatty alkyldiketene, and a cationic starch having an amylopectin content of at least 85% and a degree of cationization (D.S.) of from 0.045 to 0.4. The proportion of amylopectin in the cationic starch is preferably from 98 to 100%.
EP-B-0 369 328 discloses aqueous alkyldiketene dispersions containing up to 30% by weight of ketenedimer. Further essential constituents of these alkyldiketene dispersions are cationic starch, preferably cationic waxy maize starch, aluminum sulfate, carboxylic acids having from 1 to 10 carbon atoms, and sulfonates such as the sodium salt of ligninsulfonic acid or condensation products of formaldehyde and naphthalenesulfonic acids.
EP-B-0 437 764 discloses stabilized aqueous alkyldiketene dispersions comprising, apart from an alkyldiketene, a protective colloid and an ester of a long-chain carboxylic acid and a long-chain alcohol. Preferred protective colloids are cationic starches. In addition, sorbitan esters, soaps, synthetic detergents and thickeners such as polymers of acrylamide, vinylpyrrolidone and N-vinyl-2-methylimidazoline can also be used.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide novel aqueous alkyldiketene dispersions which have a long shelf life and, if possible, are shear stable and have a high concentration of dispersed alkyldiketene.
We have found that this object is achieved by means of aqueous alkyldiketene dispersions comprising an alkyldiketene, cationic starch and anionic dispersants, if the cationic starch has an amylopectin content of at least 95% by weight and the anionic dispersants present in the dispersions are naphthalenesulfonic acid and formaldehyde, sulfonated polystyrene, salts and mixtures of said polymers and at least 10 carbon atoms, phosphoric monoesters or diesters of alcohols having at least 10 carbon atoms, sulfuric monoesters of alkoxylated alcohols having at least 10 carbon atoms, phosphoric monoesters or diesters of alkoxylated alcohols having at least 10 carbon atoms, C.sub.12 -C.sub.30 -alkylsulfonic acids, salts and mixtures of said compounds.
The present invention also provides for the use of the above-described aqueous alkyldiketene dispersions as body size in the manufacture of paper, paperboard and cardboard and for making cellulose fibers hydrophobic.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The preparation of the aqueous alkyldiketene dispersions preferably starts from C.sub.14 -C.sub.22 -alkyldiketenes or from mixtures of such alkyldiketenes. Alkyldiketenes are known and commercially available. They are prepared, for example, from the corresponding carboxylic acid chlorides by elimination of hydrogen chloride using tertiary amines. Suitable fatty alkyldiketenes are, for example, tetradecyldiketene, palmityldiketene, stearyldiketene and behenyldiketene. Also suitable are diketenes having different alkyl groups, e.g. stearylpalmityldiketene, behenylstearyldiketene, behenyloleyldiketene or palmitylbehenyldiketene. Preference is given to using stearyldiketene, palmityldiketene, behenyldiketene or mixtures of stearyldiketene and palmityldiketene or mixtures of behenyldiketene and stearyldiketene. The diketenes are present in the aqueous emulsions in concentrations of, for example, from 10 to 45% by weight, preferably from 15 to 25% by weight.
The alkyldiketenes are emulsified in water in the presence of cationic starch which, according to the present invention, has an amylopectin content of at least 95% by weight, preferably from 98 to 100% by weight. Such starches can be obt
REFERENCES:
patent: 4861376 (1989-08-01), Edwards et al.
patent: 5154763 (1992-10-01), Ksoll et al.
Database Paperchem, The Institute of Paper Science and Technology, Atlanta, GA., US, Goshiki, K., et al.: "Sizing Composition for Papermaking", XP002024597 siehe Zusammenfassung & JAP. Kokai 250,499/89. Oct. 5, 1998 8 P. CL. D21H3/02. Filed: Jap. Appln. 74,592/88 (Mar. 30, 1988).
Bonn Johann
Ettl Roland
Lorencak Primoz
Reuther Wolfgang
BASF - Aktiengesellschaft
Nutter Nathan M.
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