Abstract:
The present invention provides a method of preparing starch or a starch derivative in the form of granules for use as a substrate strengthener, the method including the step of heating the granules to the point just before, just at or just after they rupture.
Abstract:
Aqueous dispersions of water-soluble polymers of N-vinyl carboxylic acid amides that comprise the following in relation to 100 parts by weight of water: (A) 5-80 parts by weight of a water-soluble polymer containing N-vinylformamide and/or N-vinyl acetamide with particle sizes ranging from 50 nm 2 mu m and (B) 1-50 parts by weight of at least one polymer dispersion agent that is incompatible with the water-soluble polymers (A) in an aqueous solution. The invention also relates to a method for the production of said dispersions by polymerization of (A) 5-80 parts by weight of N-vinyl formamide and/or N-vinylacetamide, optionally together with other monoethylenically unsaturated monomers that form water-soluble polymers, and (B) 1-50 parts by weight of at least one polymer dispersion agent that is incompatible with the polymers formed from the monomers (A) in an aqueous solution, in 100 parts by weight of water at temperatures ranging from 30-95 DEG C in the presence of 0.001-5.0 wt. % in relation to the monomers used. The invention further relates to the use of aqueous dispersions of water-soluble polymers as dehydrating agents.
Abstract:
The object of the invention is a novel cationic starch which consists of natural products such as starch and betaine. In the product, betaine is covalently bound via an ester bond to a part of the hydroxyl groups of the starch, when the product has structural formula (I), wherein St represents the polymeric structure of the starch.
Abstract:
Composition comprising crosslinked, thermosetting, water soluble polymer having nonionic moieties derived from acrylamide, methacrylamide or both; anionic moieties derived from alpha , beta -unsaturated carboxylic acids having from 3 to 5 carbon atoms and salts thereof; and optionally cationic moieties derived from unsaturated monomers containing amino groups or quaternary ammonium groups, said polymer having aldehyde functionality.
Abstract:
An impulse-dried paper having a three-dimensional pattern of alternating raised and recessed portions which is conveyed to the paper in connection with the impulse drying. The paper contains at least 0,05 % by weight, calculated on the dry fiber weight, of one one more additives which in connection with impulse drying undergoes a chemical reaction so that they contribute in stabilizing the pattern structure that has been conveyed to the paper at the impulse drying. An example of such an additive is a wet strength agent.
Abstract:
Additives for addition to starting materials in cellulose based products for imparting strength and crepe. Additives for use in paper production which impart strength to the product and which can be used in creping adhesives. Enzyme activated resins for use in paper production. Enzyme-activated adhesives for use in paper production. Paper products comprising the aforementioned additives or resins. Methods for imparting strength or crepe to paper products.
Abstract:
Process for the oxidation of the oxidizable galactose type of alcohol in oxidizable galactose type of alcohol configuration containing polymer, such as guar, with galactose oxidase in the presence of oxidation promoting chemicals.
Abstract:
The invention relates to a method for internally-sizing paper, paperboard and cardboard, using resin size and aqueous polymer sizing agent dispersions as fixing agents for the resin size.
Abstract:
The invention relates to a composition for enhancing the strength or sizing properties of a cellulosic fiber, comprising a) a self-emulsifying isocyanate and b) a coupling agent. The invention also relates to a kit of the composition, a process for enhancing the strength or sizing of a cellulosic fiber, products made from the process, and modified cellulosic fiber. The coupling agent and self-emulsifiable isocyanante can be added at a number of points in the paper making process. In one embodiment, the coupling agent and self-emulsifiable isocyanate are independently added to the cellulosic fiber at any point between the exit of the machine chest (5) and the screens (11) just prior to the headbox. In one embodiment, the coupling agent and self-emulsifiable isocyanate are added to the cellulosic fiber before or after the screens (11). In one embodiment, the coupling agent and self-emulsifiable isocyanate are added to the cellulosic fiber at the stuff or headbox (6). In a prefered embodiment, the self-emulsifiable isocyanate and coupling agent are added at the fan pump (8). Even more preferably, the self-emulsifiable isocyanate is added just prior to the fan pump (8) and the coupling agent just after the fan pump (8). The coupling agent and self-emulsifiable isocyanate can be added at the same point, either in separate lines or as a premixed composition, or at different points in the process.
Abstract:
The present invention relates to a starch which is modified with at least one cationic polymer and a method for its production, which is characterized in that dry, pourable starch is laid out and the cationic polymer is applied over it without causing the starch particles to stick. The invention further relates to the use of said polymer-modified starches.