Abstract:
An acid-fortified rosin is reacted with a water-soluble polyalkylenepolyamine. The product is a modified rosin polyamidopolyamine. The product can be partially or completely neutralized with a rosin, thereby forming a rosin soap of the polyamidopolyamine. The products can be emulsified in water, and are cationic, anionic or non-ionic depending on the pH of the water. The emulsions are sizing agents for paper.
Abstract:
Improved sizing compositions for cellulosic products, e.g., paper, are provided by combining first and second composition components while at least the second component is finely divided into fine liquid or solid particles. Component combination in this manner serves to provide especially effective sizing compositions.The first component comprises a material which provides both ammonia and ammonium salt when combined with other materials in the composition. Such ammonia-ammonium salt-providing material comprises at least one material selected from the group consisting of ammonia, or a precursor thereof; ammonium salts, or a precursor thereof; a reaction product of urea and at least one selected Lewis acid; and mixtures of these materials.The second component comprises a saponified, partially saponified or unsaponified rosin that is modified with either an .alpha., .beta.-unsaturated aliphatic acid generally containing from about 3 to 10 carbon atoms, an anhydride of such acids, or mixtures thereof.The improved sizing compositions produced comprise ammonia, ammonium salt and modified rosin, which components are present in sizing-effective or sizing-enhancing amounts, such that a total acidity of the composition of at least about 1000 parts per million is realized.
Abstract:
This invention relates to improved rosin sizes, and to improved methods for preparing sized paper. In one embodiment, sized paper is prepared by adding the improved rosin size and a polyamine retention aid to a pulp slurry before sheet formation, without the use of aluminum sulfate. In another embodiment, paper is surface-sized with the improved rosin size in the absence of both aluminum sulfate and retention aids.
Abstract:
Process for making erasable paper by forming a paper web, contacting the formed web with a parchmentized solution, removing excess acid, at least partially drying the web, and applying to a surface of the paper one or more sizing agents which are low molecular weight polyesters made by reaction of rosin and maleic anhydride adducts with polyhydric alcohols, and are preferably polyesters of rosin-maleic anhydride adducts with aliphatic polyols, and are applied alone or in combination with certain additives. The invention also includes the product of the foregoing process.
Abstract:
Improved sizing compositions for cellulosic products, e.g., paper, are provided by combining first and second composition components while at least the second component is finely divided into fine liquid or solid particles. Component combination in this manner serves to provide especially effective sizing compositions.The first component comprises a material which provides both ammonia and ammonium salt when combined with other materials in the composition. Such ammonia-ammonium salt-providing material comprises at least one material selected from the group consisting of ammonia, or a precursor thereof; ammonium salts, or a precursor thereof; a reaction product of urea and at least one selected Lewis acid; and mixtures of these materials.The second component comprises a saponified, partially saponified or unsaponified rosin that is modified with either an .alpha., .beta.-unsaturated aliphatic acid generally containing from about 3 to 10 carbon atoms, an anhydride of such acids, or mixtures thereof.The improved sizing compositions produced comprise ammonia, ammonium salt and modified rosin, which components are present in sizing-effective or sizing-enhancing amounts, such that a total acidity of the composition of at least about 1000 parts per million is realized.
Abstract:
Described are sizing compositions in the form of aqueous dispersions comprising a hydrophobic cellulose-reactive sizing agent such as a ketene dimer, fortified rosin and a water-soluble, nitrogen-containing cationic dispersing agent. The compositions are highly efficient internal or surface sizing agents for paper and maximize the advantages of each sizing component while minimizing the disadvantages.
Abstract:
Stable aqueous dispersions which are useful as one-shot sizing agents for paper, i.e. which do not require the separate addition of a flocculating agent, are prepared by combining a rosin dispersion, aluminum sulfate, and an alkali in a prescribed manner. The dispersions may also contain an added stabilizer such as a starch derivative, hydroxyethyl cellulose, or polyvinyl pyrrolidone if desired. These compositions can be used for either internal or external sizing.