摘要:
There is provided particulate silica which can be suitably used as a viscoelasticity modifier such as a thickener which is added to liquid such as water, a liquid resin or paint to adjust its viscoelastic properties such as viscosity and thixotropic nature, a reinforcer or filler for silicone rubber or sealants, a polishing agent for CMP (Chemical Mechanical Polishing) or a surface coating agent for ink-jet printing paper.The particulate silica has a BET specific surface area S of 130 to 380 m2/g, and its fractal shape parameter α1 in an α-value analysis target range of 20 to 30 nm satisfies the following equation (1) and its fractal shape parameter α2 in an α-value analysis target range of 30 to 50 nm satisfies the following equation (2). α1+0.00175S
摘要:
The present invention aims to provide coated printing paper having good printing quality combined with the property of decomposing hazardous substances upon exposure to light and resistance to fading.Coated printing paper comprising a coating layer containing a pigment and an inorganic adhesive and an organic adhesive on a base paper, wherein the coating layer contains 1-30 parts by weight of titanium dioxide having an average secondary particle diameter of 300-2000 nm per 100 parts by weight of the pigment and the coated paper has a PPS roughness of 0.5-5.0 μm.
摘要:
A paper coating includes a combination of a primary pigment and a secondary pigment. The primary pigment includes anionic particles having a particle size distribution where at least 96% of the particles by weight have a particle size less than 2 microns. The secondary pigment is a cationic, grit-free pigment having an average particle size of 3 microns or less. The coating also includes up to 17 weight % of a hydrophilic styrene-butadiene latex based on the weight of the dry pigments and a co-binder. Another embodiment of this invention is a coated base sheet that includes a base sheet to which the above coating has been applied.
摘要:
A process to load a fibrous slurry with a filler, in particular with calcium carbonate (fiber loading). The loaded fibrous slurry is divided into at least two fractions, a light fraction and a heavy fraction, for which purpose hydrocyclones are used in one embodiment. In this case, the different fractions have a different level of loading, that is to say the quantity of precipitated fillers adhering to the fibers is different in each case. There is the possibility of feeding the less highly loaded fibers back into the loading process, in order to increase the level of loading of this fraction further.
摘要:
ASA sizing emulsions are described, as well as emulsifying agents containing starch and a terpolymer of acrylamide/quaternary ammonium compound/glyoxal, and an ASA blend that contains ASA and a co-surfactant blend of anionic surfactant and nonionic surfactant. Processes for sizing paper products with the emulsions are also described.
摘要:
A paper product (20) is provided of at least one sheet of soft degradable paper material at least partially coated or impregnated with a mineral material such as rock dust (11) in a fine particulate form. The mineral material having characteristics which enhance micro-organism activity at the paper product (20) at least under some naturally occurring environmental conditions. Seeds (12) may also be added to the paper product (20).
摘要:
A method of treating paper to have a photo-feel backcoating includes preparing a mixture of a binder and polyethylene particles wherein the polyethylene particles have first and second sizes, and coating the mixture onto a surface of a sheet of paper which is opposite the surface of the sheet which is configured to receive printing thereon.
摘要:
A method for forming calcium carbonate is provided, the method comprising the steps of: (a) milling calcium hydroxide; (b) providing a reactor vessel containing a slurry of the milled calcium hydroxide; and (c) carbonating the slurry of the milled calcium hydroxide by introducing carbon dioxide into the reactor vessel to form basic calcium carbonate by a precipitation reaction, wherein the initial reaction temperature is from about 8° C. to about 15° C.
摘要:
The invention relates to a process for manufacturing paper, in which a filler is pretreated and suspended to form an aqueous slurry, the aqueous slurry obtained is combined with an aqueous suspension containing cellulose fibres to form a stock, the stock obtained is treated at least with a cationic retention agent and the treated stock is filtered to form paper. Retention and optical properties are improved by the filler being pre-treated with inorganic colloidal particles having an average size less than 100 nm.
摘要:
The present invention provides high brightness kaolins exhibiting a Brightness (GE) of at least about 90.0. The hydrous kaolin pigments of the present invention may also have, inter alia, a steepness index (d30/d70×100) of at least about 39 and/or a titania concentration less than or equal to about 0.40% by weight of the pigment on a dry basis. (062) The hydrous kaolin pigment is produced by a process comprising: a) forming an aqueous suspension of a hydrous kaolin clay; b) forming a primary product by subjecting the suspension to classification or a combination of classification and griding; c), separating the kaolin from impurities by selective flocculation; and d) defining the separated kaolin. (063) The hydrous kaolins of the present invention allow coated papers to be produced at high brightness while maintaining acidic conditions on a paper machine. The invention pigmets exhibit brightness levels unexpectedly higher, e.g., about 2 to about 2.5 or more (GE) units brighter, than exhibited by previous high brightness hydrous kaolin pigments, without sacrificing other important paper properties. Paper coated with the inventive pigmants have high brightness, high whiteness, and high fluorescence levels. The present invention encompasses these pigments, compositions comprising them, and any application in which they are used.