摘要:
The present invention relates to a process for the preparation of methacrylic acid or methacrylic esters, comprising the process steps of IA) preparation of 3-hydroxyisobutyric acid by a process comprising the process step of bringing a cell which has been genetically modified in comparison with its wild type in such a way that it is capable of forming more 3-hydroxyisobutyric acid, or polyhydroxyalkanoates based on 3-hydroxyisobutyric acid in comparison with its wild type, into contact with a nutrient medium comprising, as carbon source, carbohydrates, glycerol, carbon dioxide, methanol, L-valine or L-glutamate under conditions under which 3-hydroxyisobutyric acid or polyhydroxyalkanoates based on 3-hydroxyisobutyric acid are formed from the carbon source, if appropriate, isolation of the 3-hydroxyisobutyric acid from the nutrient medium and also, if appropriate, neutralization of the 3-hydroxyisobutyric acid, IB) dehydration of the 3-hydroxyisobutyric acid with formation of methacrylic acid and also, where appropriate, esterification methacrylic acid. The invention also relates to a process for the preparation of polymethacrylic acid or polymethacrylic esters.
摘要:
A drilling device, which is adjustable at least between a clamping configuration, a drilling configuration and a screwing configuration, includes a machine housing and a machine spindle, which is drivable with the aid of a motor. A drill chuck having a jaw holder, in which clamping jaws are guided, which are adjustable with the aid of a threaded connection provided between an entrainer and a threaded sleeve is provided. A drill spindle, which is drivable by the motor via a planetary gear set, is disposed on the side facing the machine spindle and includes a sun wheel, a planet carrier, which carries at least one planet wheel, and a ring wheel, which has at least one cam, which interacts with at least one clutch element, which is fixed with respect to the ring gear in the drilling configuration. The at least one clutch element is supported with respect to the ring wheel, movable against a clamping spring force of a clamping spring, and the at least one clutch element is movably supported against a screw spring force, in the screwing configuration, the screw spring force resulting from a series connection of the clamping spring and a screw spring.
摘要:
A chuck having a chuck body in which clamping jaws are movably carried in radially extending guide seats. The clamping jaws include a base jaw and a top jaw arranged on the base jaw in a tongue and groove, and include at least one sensor for sensing the clamping force, whereby the sensor is associated with the tongue and groove.
摘要:
The present invention relates to a process for hydrolysis of acetone cyanohydrin (ACH) by means of sulphuric acid within the ACH sulpho process for preparation of methacrylic acid (MAA) or methyl methacrylate (MMA).
摘要:
The subject matter of the invention is a detector system for detecting magnetic bodies in the human organism, which comprises at least two sensor assemblies, wherein each sensor assembly has one, two or three anisotropic magnetic resistance sensors, of which the axes of weak magnetisation point in different directions in pairs, and each sensor assembly has a spacing of 0.5 to 50 cm from the sensor assembly or the other sensor assemblies, and at least two sensor assemblies are tilted at an angle of 0 to 45° with respect to one another, and in addition a method for detecting the magnetic flux produced by a magnetic body in the human organism, and the use of the detector system according to the invention for detecting swallowed magnetic bodies and the disintegration of the same in the digestive system.
摘要:
The invention relates to a device for producing a reinforced foam material and for receiving a textile semifinished product in a hook. To this end, the device has a first subunit having a transport device and a second subunit having a receiving device. The transport device is designed to convey the textile semifinished product into the receiving device, and the first subunit and the second subunit are designed such that the textile semifinished product can be presented in defined length by a relative movement of the first subunit relative to the second subunit. Furthermore, the receiving device of the second subunit is set up such that the textile semifinished product can be placed in the hooks by a relative movement of the receiving device relative to the hook.
摘要:
A method of producing a trafficway marking, the method including applying a cold plastic to a trafficway surface, to obtain the trafficway marking, where, in less than 5 minutes after the applying, the trafficway marking can withstand the passage of traffic, and where the cold plastic includes from 15% to 45% by weight of a reactive resin; from 1% to 5% by weight of a mixture comprising an initiator; from 7% to 15% by weight of an inorganic pigment; and from 50% to 60% by weight of a mineral filler.
摘要:
The invention relates to surface enhancements for composite mouldings made from polymeric materials and to the use thereof in solar systems. These solar systems may be solar reflectors for concentrating solar radiation, flexible photovoltaic composite films, or CPV (Concentrated Photovoltaics) lenses for concentrating solar radiation.The surface enhancement comprises a self-healing coating based on crosslinkable fluoropolymers, e.g. PFEVE (polyfluoroethylene alkylvinyl ethers). These coatings exhibit good optical properties, can be used in outdoor applications, more particularly in solar applications, over very long periods of time, exhibit self-cleaning properties, and in particular are self-healing in relation to mechanical damage—such as scratching.