摘要:
Bis-hydroxyphenyl-n-alkanes are prepared by contacting dicarboxylic acids or dicarboxylic acid derivatives with fluorine-containing organic sulphonic acids, where appropriate with the addition of a phenolic compound, and converting the alkanediones, which are thus obtainable, into bis-hydroxyphenyl-n-alkanes by hydrogenation and, where appropriate, an additional ether cleavage. The invention also relates to new bis-hydroxyphenyl-n-alkanes and to new alkanediones.
摘要:
The invention relates to SO.sub.3 adducts with imides, which are sparingly soluble or insoluble in water, of the formula ##STR1## in which R.sub.1, R.sub.2 and R have the meaning indicated in the description, a process for the preparation of the adducts and their use as sulphonating agents.
摘要:
Monodisperse cation-exchangers and anon-exchangers are conditioned by a process and thereafter used as catalysts and for the production of bisphenols.
摘要:
For the transmission of heat under vacuum conditions to a workpiece, a carrier is used with gas outlets and gas return openings distributed on its surface. A dynamic gas layer is thus formed between the carrier and the workpiece wherein the gas effects thermal conduction between the carrier and the workpiece. The gas outlets terminate in a distribution space implemented as a groove.
摘要:
An electrical soldering gun for pipe soldering has a plastic case with a pistol grip handle and a single elongated electric heating element extending longitudinally of the case. A first soldering jaw with recesses is disposed on and extends axially of the heating element and has directly hingedly connected in heat exchange relationship therewith with a second jaw provided with complementary recesses for cooperating with the first jaw recesses to receive and grip a pipe to be soldered. The second jaw is connected to a slidable trigger on the casing by a pull rod for manually pivotally moving the second jaw away from the first jaw against the force of a spring associated with the trigger normally biasing the push rod and second jaw toward the first jaw.
摘要:
A flaring tool and flaring apparatus for cylindrically flaring the ends of tubes. The flaring tool is provided in the vicinity of one end thereof with flaring elements that are fixedly connected thereto and have an at least approximately spherical shape. The flaring elements are essentially in point-type contact with the tube and generate high specific deformation forces during flaring. When the flaring tool is rotated about its axis, the tube end is continuously flared. The flaring apparatus has an adapter that can be shifted via a thread connection. The adapter fixedly accommodates the flaring tool, and can be connected to a drive unit.
摘要:
A portable compass saw having an oscillation drive for a push rod, to which a saw blade is attached. The push rod has an angular cross-section, and is guided over part of its length on all sides in a housing. Guide surfaces, themselves formed by parts of the housing, are provided for the purpose of guidance on two opposite sides of the push rod. Roller bearings extending at right angles to the stroke direction are respectively located on the two other sides of the push rod. In the region of the oscillation drive, a pressure member acts on the push rod on the opposite side. This member loads the push rod in the direction toward the oscillation drive. The push rod is consequently guided in a trouble free manner in the housing in, and at right angles to, the direction of the stroke, so that no play occurs which may impair the saw cut.
摘要:
A ply includes a fibrous nonwoven web fabric forming a foundational structure, wherein the foundational structure includes fibers forming first pores and is partially filled with particles, wherein the particles at least partially fill the first pores so as to form regions filled with particles, wherein the particles in the filled regions form second pores such that an average diameter of the particles is greater than an average pore size of more than 50% of the second pores.
摘要:
Described is a façade structure, having a sub-structure that is formed from vertical and/or horizontal profiled supports, is located in front of a building wall or is anchored in a fixed manner in the ground or in the building wall. Façade panels made of ceramic material are secured to the sub-structure via panel holders (13). For securing the panel holder (13) to the sub-structure, the sub-structure has a vertical flange (14), in which a vertical row of holes (16) is realized by a plurality of elongated holes (14l) located one above another, wherein the elongated holes (14l) each extend at an acute angle to the horizontal and are located parallel to one another, and the row of holes (16) is located between two parallel extending guide ribs (14f), which protrude forward from the vertical flange (14f). The securing flange of the panel holder (13) is insertable in an engaging manner between the guide ribs (14f) and has at least one elongated hole (13l), which extends at an angle to the horizontal that is not identical to the angle of the elongated holes (14l) of the row of holes (16) realized in the vertical flange (14) of the sub-structure. For securing the securing flange of the panel holder (13) to the front flange of the sub-structure, a securing element (17) is insertable into the intersection region of the elongated holes.
摘要:
The present invention relates to a process for producing weakly acidic cation exchangers of the polymethacrylic acid type by alkaline saponification of a crosslinked copolymer of alkyl methacrylate and methacrylic acid.