250 results about "Size composition" patented technology

Surface-modified discontinuous glass fibers are provided for incorporation in a thermoplastic matrix to form a fiber-reinforced composite article by injection or compression molding which displays enhanced mechanical properties, including improved tensile strength. Good binding between the discontinuous glass fibers and the thermoplastic matrix is achieved through the presence of finely roughened surfaces on the fibers of nanoparticles of an inorganic material. Such nanoparticles are provided from an alkaline aqueous size composition containing the nanoparticles dispersed therein (as described). The glass fibers are initially provided in continuous form followed by cutting into discontinuous lengths and drying with the retention of the nanoparticles on the surfaces of the fibers. Improved color in the resulting injection or compression molded thermoplastic discontinuous glass fiber-reinforced composite articles is made possible in combination with enhanced mechanical properties.

The invention relates to polyurethane-polyurea dispersions comprising structural units of formula (I) in which R1 is an aliphatic or cycloaliphatic radical having 2 to 18 C atoms and R2 is an aliphatic radical having 3 to 5 C atoms. Preparation of the polyurethane-polyurea dispersion and use as a size composition is also disclosed.

Methods of making fiber reinforced composite articles are described. The methods may include treating fibers with a sizing composition that includes a polymerization compound, and introducing the treated fibers to a pre-polymerized composition. The combination of the treated fibers and pre-polymerized composition may then undergo a temperature adjustment to a polymerization temperature at which the pre-polymerized composition polymerizes into a plastic around the fibers to form the fiber-reinforced composite article. Techniques for introducing the treated fibers to the pre-polymerized composition may include pultrusion, filament winding, reactive injection molding (RIM), structural reactive injection molding (SRIM), resin transfer molding (RTM), vacuum-assisted resin transfer molding (VARTM), long fiber injection (LFI), sheet molding compound (SMC) molding, bulk molding compound (BMC) molding, a spray-up application, and / or a hand lay-up application, among other techniques.

A method of sizing paper for use in applications which require resistance to liquids comprising incorporating in the paper a size composition comprising one or more alkenyl succinic anhydride (ASA) compounds prepared from the reaction of maleic anhydride and one or more substantially symmetrical C20-C28 internal olefins.

A low VOC sizing composition includes a liquid carrier containing a silane which, upon hydrolysis, produces substantially no significant amount of volatile organic compound and / or the silicon-containing hydrolyzate of the silane. The sizing composition can optionally include one or more of film forming agents, anti-static agents, lubricants, surfactants, emulsifying agents, wetting agents, peroxide, starch, oil, plasticizer, wax, acids or bases.

The specification discloses papers suitable for liquid electrophotographic printing (“LEP”) and a method for making such papers. According to the method, a papermaking furnish containing cellulosic fibers is formed into a fibrous web on a papermaking machine and at least partially dried. The web is then treated with a sizing composition comprising starch, an acrylic acid polymer, an organic material having an HLB value of from about 2 to about 14 such as a polyglycerol ester, and water. The treated web is dried and calendered to a final desired caliper. Since the sizing composition is an aqueous mixture, it may be applied to the web on-line during production of the paper on the papermaking machine, thereby avoiding the expense and inconvenience of conventional off-line methods used to make existing LEP papers. The resulting paper exhibits at least 80% and preferably above 90% toner adhesion as measured by the tape pull tests used for the assessment of papers printed by LEP.

The invention discloses a reverse / direct flotation technology of collophanite. The technology comprises the following steps of: performing ore reduction, ore grinding and size mixing on the silicon calcium type collophanite; adding a carbonate gangue mineral flotation regulator and fatty-acid soap respectively to perform size mixing; performing reverse flotation on the material after the size mixing, wherein the product in the tank is reverse flotation concentrate; dehydrating the reverse flotation concentrate and adding sodium carbonate so as to adjust the pH value to 8-10; performing closed-loop ore grinding and grading on the base flow; enabling the grading overflow to enter a direct flotation stirring tank, and adding water glass and fatty acid soap into the tank respectively to perform size mixing; performing direct flotation on the material subjected to the size mixing, wherein the direct flotation foam product is direct flotation concentrate; and performing concentration, filtration and drying to obtain the finished product of phosphate concentrate. After dehydration (reagent removal), the technology disclosed by the invention can be used for remarkably reducing the amount of sodium carbonate for neutralizing acid water; the sodium carbonate has a dispersion and grinding aid function, and the over-grinding of the material of direct flotation can be reduced; and the fresh surface and proper size composition generated by the ore grinding are favorable for improving the sorted behavior of the direct flotation and improving the sorting efficiency.

The present invention is directed to sizing compositions for glass fibers and glass fiber reinforced thermoplastic resins. The sizing composition comprises a maleic anhydride copolymer. Thermoplastic polyamide resin articles reinforced with glass fibers at least partially coated with a residue of the sizing composition can demonstrate a surprising improvement in strength of the reinforced polyamide resin when lubricated with a fatty acid metal salt and in the hydrolysis resistance when exposed to boiling water / ethylene glycol medium.

A surface-modified fibrous material is provided for incorporation in a thermoplastic matrix to form a fiber-reinforced composite article. Good binding between the fibrous material and the thermoplastic matrix is achieved through the presence of finely roughened surfaces on the fibers of nanoparticles of an inorganic material. Such nanoparticles are provided from an alkaline aqueous size composition containing the nanoparticles dispersed therein (as described). The fibrous material may be provided in continuous or discontinuous form. In a preferred embodiment glass fibers are initially provided in continuous form followed by cutting into discontinuous lengths and drying with the retention of the nanoparticles on the surfaces of the fibers. The surface-roughened fibrous material is incorporated in a thermoplastic matrix as fibrous reinforcement with the application of heat whereby the thermoplastic matrix is rendered melt processable. In preferred embodiments injection or compression molding is utilized. Improved long-fiber thermoplastics also may be formed to advantage.