Abstract: A process for the production of an aqueous sol containing silica-based particles which comprises (a) acidifying an aqueous silicate solution to a pH of from 1 to 4 to form an acid sol; (b) alkalizing the acid sol at an SiO2 content within the range of from 4.5 to 8% by weight; (c) allowing particle growth of the alkalized sol for at least 10 minutes; or heat-treating the alkalized sol at a temperature of a least 30° C.; (d) alkalizing the obtained sol to a pH of at least 10.0; and (e) optionally concentrating the sol obtained according to (b), (c) or (d) to provide an aqueous sol containing silica-based particles and having a specific surface area of at least 90 m2/g aqueous sol; as well as an aqueous sol containing silica-based particles obtainable by the process.

Abstract: A process for sizing paper comprising adding to an aqueous suspension containing cellulosic fibers, and optional fillers, an anionic or cationic sizing dispersion, and a sizing promoter comprising a cationic organic polymer having an aromatic group; and an anionic polymer having an aromatic group selected from step-growth polymers, polysaccharides and naturally occurring aromatic polymers, wherein the sizing dispersion and sizing promoter are added separately to the aqueous suspension.

Abstract: A process for sizing paper comprising adding to an aqueous suspension containing cellulosic fibers, and optional fillers, a sizing dispersion comprising a polymer having an aromatic group, and a sizing promoter comprising a polymer having an aromatic group, wherein the sizing dispersion and the sizing promoter are added separately to the aqueous suspension.

Abstract: An aqueous dispersion of a sizing agent comprising starch having aromatic groups and a condensed sulfonate, wherein the starch contains less than 95 weight % of amylopectin.

Abstract: A process for the production of paper in which cellulosic fibers are treated with microparticles comprising shell-formed carbon allotrope particles, paper obtainable from this process, and a drainage and/or retention agent comprising at least partially hydrophilic, anionic microparticles comprising shell-formed carbon allotrope particles.

Abstract: A method of manufacturing a shell element (13) for an electronic device, said shell element (13) having a front (5) and at least one part that is angled in relation to said front (5). The shell element (13) further comprises a formed sheet (6) that constitutes at least a part of the outer surface of said front (5) and at least a part of said part that is angled in relation to the front of the shell element (13). The method comprises the steps of first forming a sheet (1) to a desired shape including a part that is angled in relation to a front part (5) and then injection moulding a plastics material on the back of the formed sheet (6). At least one area of the angled part of the formed sheet (6) is provided with an undercut (7) at the latest during injection moulding of the plastics material on the back of the formed sheet (6).

Abstract: A shielding device is formed by a wall having a top edge arranged to fasten a foil comprising an electrically conducting material. In order to fasten the foil, the wall can be provided with teeth at its top section. Also the wall(s) can be formed with arbitrary angles with respect to each other when forming a whole shielding device. The cover can be formed by one large or several smaller pieces. The cover is fastened to the walls by means of an adhesive, glue or soldering and an electrical contact is provided by the teeth projecting from the wall(s).

Abstract: A method of manufacturing a shell element (13) for an electronic device, said shell element (13) having a front (5) and at least one part that is angled in relation to said front (5). The shell element (13) further comprises a formed sheet (6) that constitutes at least a part of the outer surface of said front (5) and at least a part of said part that is angled in relation to the front of the shell element (13). The method comprises the steps of first forming a sheet (1) to a desired shape including a part that is angled in relation to a front part (5) and then injection molding a plastics material on the back of the formed sheet (6). At least one opening (7) is provided in the angled part of the formed sheet (6) before the plastics material is injection molded on the back of the formed sheet (6) and the at least one opening (7) is left open during the injection molding of a plastics material on the back of the formed sheet (6).

Abstract: The invention concerns a method of protecting a surface of a carbonatic material from corrosion, the method comprising treatment of the material surface with an acidic cationic silica sol, the pH of the sol preferably being from about 4 to about 7. The invention also concerns a new silica sol useful for performing the method and a method of preparing the new silica sol. Further, the invention concerns carbonatic material comprising a surface layer of silica, the surface of the silica particles comprising a polyvalent metal oxide/hydroxide.

Abstract: The invention relates to a process for the production of paper from a suspension of cellulose containing fibers, and optional fillers, comprising adding to the suspension a low molecular weight cationic organic polymer, a high molecular weight cationic or amphoteric polymer and anionic inorganic particles, forming and draining the suspension on a wire, wherein the low molecular weight polymer has a molecular weight below 700,000 and the high molecular weight polymer has a molecular weight above 1,000,000, said polymers being simultaneously added to the suspension.

Abstract: Heat-generating power transistors (3) hanging from a circuit board (2) are mounted pressed flush against the inside surface of a heat dissipating thin sheet metal box (1), by using spring metal band clips (4) completely mountable from outside the metal box (1), by insertion of a foot end (4b) of each clip into a first slot (6) in the box and snapping an opposite end (4a), bent to form a spring fluke, into a second parallel slot (5). Slots (6,5) and a clip recessing trough (7) between them can be stamped in the thin sheet metal box bottom (1b).

Abstract: The invention relates to a process for the production of paper from a suspension of cellulose containing fibers, and optional fillers, comprising adding to the suspension a low molecular weight cationic organic polymer, a high molecular weight cationic or amphoteric polymer and anionic inorganic particles, forming and draining the suspension on a wire, wherein the low molecular weight polymer has a molecular weight below 700,000 and the high molecular weight polymer has a molecular weight above 1,000,000, said polymers being simultaneously added to the suspension.

Abstract: A method of protecting a porous material sensitive to corrosion caused by pollutants in the atmosphere. The method comprises treating the surface of the material with an agent containing more than 90% by weight of silica sol. The agent contains substantially no solid particles with a diameter exceeding about 1 micron. Porous building materials comprising a layer of gelled silica sol present in the pores below the material surface are prepared by the method.