摘要:
The invention relates to novel benzotriazole UV-absorbers having a long wavelength shifted absorption spectrum with significant absorbance up to 410-420 nm. Further aspects of the invention are a process for their preparation, a UV stabilized composition containing the new UV-absorbers and the use of the new compounds as UV-light stabilizers for organic materials.
摘要:
The invention relates to a method and to a shearing and compacting press for the production of pressed parts, preferably packages (20) from waste material, especially scrap and sheet clippings. The material used is pre-compacted in a first compacting step. In a second compacting step, the material, which has been pre-compacted to the width of the package, is subjected to intermediate compacting until the height of the package (20) is reached. In a third compacting step, final compacting of the material to the final width or length of the package (20) is carried out. According to the invention, the material is pre-compacted with a continuos force and optionally sheared until the compressor (3.1) reaches its final position. The compressor (3.2) is securely adjusted and guided to its end position on a parallel plane. Subsequently, the compressor (3.3) is guided in a position in which the compressor (3.1) releases the opening of the package chamber (2.3) when the compressor (3.1) is driven back. Finally, the compressor (3.1, 3.2, 3.3) is subjected to a pressure that is lower than the maximum pressure available in the compressors (3.1, 3.2, 3.3) at the beginning of the working and return strokes. The compressor (3.1) is subjected to maximum pressure for shearing and/or the compressors (3.2, 3.3) are supplied with maximum pressure to end pressing. The invention is also characterized in that the pressing pressure for the compressors (3.1, 3.2, 3.3) is gradually controlled depending on the degree of compression or the corresponding length.
摘要:
Halogen-free epoxy resins that arise from the addition of an epoxy component to a phenol component with base catalysis are disclosed, whereby the molar mass can be adjusted by means of the molar ratios of the initial materials. The resulting resins can be used in the field of electronics, both as molding compounds and as circuit board materials and adhesives.
摘要:
A curable composition consisting of at least 2 components (a) and (b), wherein(a) is a liquid oligomer or polymer having a molecular weight of 200-50,000 and containing dicarboxylic anhydride groups, and(b) is a compound of formula I ##STR1## wherein A is linear or branched C.sub.2 -C.sub.20 alkylene, C.sub.5 -C.sub.7 cycloalkylene, C.sub.7 -C.sub.10 bicycloalkylene, or C.sub.1 -C.sub.30 alkylene containing one or more than one C.sub.5 -C.sub.7 cycloalkylene group or C.sub.7 -C.sub.30 bicycloalkylene group in the main or side chain, which cycloalkylene and bicycloalkylene groups can be unsubstituted or substituted by one or several C.sub.1 -C.sub.6 alkyl groups, and R.sub.1 and R.sub.2 are independently of each other C.sub.1 -C.sub.18 alkyl, C.sub.4 -C.sub.10 cycloalkyl or C.sub.7 -C.sub.24 -aralkyl, which cycloalkyl and aralkyl groups can be unsubstituted or substituted by one or more than one C.sub.1 -C.sub.6 alkyl group,has a long pot life at room temperature and is suitable for the preparation of moulded articles, primers and insulating layers.
摘要:
In a device comprising an amplifier with short circuit protection, and a resistor-capacitor (RC) filter connected to the amplifier output, an inductor is arranged in parallel with the filter resistor to protect the resistor.
摘要:
An attenuating structure composed of an epoxy resin which cationically cures with UV initiation is proposed for a surface wave component. The solvent-free epoxy resin is based on a cycloaliphatic epoxide and is applied to the wafer by screen printing. When the wafers are sawn up, sawing through can be carried out without detaching or splintering off the attenuating material. Attenuation and corrosion behavior of the attenuating structures fulfill the requirements for surface wave filters.
摘要:
The invention concerns separating materials for thin-layer chromatography, the materials having a sorbent layer formed from sorbent particles and disposed on a carrier. A reflection intensifier, preferably magnesium tungstate and/or Bi.sub.2 O.sub.3, is added to the sorbent layer. This addition comprises at least 10 wt % relative to the amount of sorbent. In preferred embodiments, the particle size of the reflection intensifier is 3 to 5 .mu.m and the amount of the reflection intensifier is 0.6 to 15 times the amount of sorbent. These separating materials are particularly suitable for the in-situ measurement of FTIR spectra. The invention also concerns the use of these separating materials for the in-situ measurement of FTIR spectra.
摘要:
A composition which consists essentially of the following components: A1) polyamines of formula (I) and/or (II) ##STR1## wherein R.sub.1 and R.sub.2 are each independently of the other a hydrogen atom or a methyl x is an integer from 1 to 3, and y is an integer from 0 to 2, the sum of x and y being up to and including 4, and z is an integer from 0 to 2; or A2) a mixture of polyamines of formula (I) and/or (II) with further polyamines; B) an aliphatic, cycloaliphatic or araliphatic alcohol or a mixture of corresponding alcohols; and C) an alkyl- and/or aralkyl-substituted monophenol or a mixture of corresponding monophenols, component C) constituting 20 to 50 percent of the total weight of the cited components. The compositions are useful as hardeners for epoxy resins to give cured material of particularly good resistance to chemicals.
摘要:
Compounds of formulae I and II ##STR1## wherein D is H or --OR wherein R is phenyl and R.sub.1 to R.sub.4 are H or a substituent such as phenylthio, and one of the substituents R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is a group of formula III--E-CR.sub.5 =C(R.sub.6).sub.2 (III)or R is substituted by a group of formula III, wherein E is a direct bond or --X-C(O)-- wherein X is a linking group, and R.sub.5 and R.sub.6 are each independently of the other H, halogen, C.sub.1 -C.sub.12 alkyl or C.sub.6 -C.sub.10 aryl, can be polymerised to homopolymers or copolymers. The monomers and polymers are reversible photochromic systems which can be used as color indicators, as photochemically modifiable color filters, or for the optical storage of information.
摘要:
There are disclosed compounds ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are each independently of one another hydrogen, a C.sub.1 -C.sub.12 alkyl group, a C.sub.1 -C.sub.12 alkoxy group, a C.sub.5 -C.sub.8 cycloalkyl group, a C.sub.5 -C.sub.8 cycloalkoxy group, a C.sub.5 -C.sub.8 cycloalkylthio group, a C.sub.6 -C.sub.10 aryl group, a C.sub.6 -C.sub.10 aryloxy group, a C.sub.6 -C.sub.10 arylthio group, nitro, halogen, cyano, --COOH, --COOR.sub.7, --NR.sub.8 R.sub.9 or --CONR.sub.8 R.sub.9, where R.sub.7 is C.sub.1 -C.sub.20 alkyl, C.sub.5 -C.sub.8 acycloalkyl, phenyl or phenyl-C.sub.1 -C.sub.4 alkyl, and R.sub.8 and R.sub.9 are each independently of the other hydrogen, C.sub.1 -C.sub.8 alkyl, phenyl or phenyl-C.sub.1 -C.sub.4 alkyl, X is nitrogen or CR.sub.4, Y is nitrogen or CR.sub.5 and Z is nitrogen or CR.sub.6, and R.sub.4, R.sub.5 and R.sub.6 are each independently of one another hydrogen, a straight-chain or branched C.sub.1 -C.sub.12 alkyl group or a C.sub.6 -C.sub.10 aryl group, with the proviso that, if X is CR.sub.4 and Y is CR.sub.5 and Z is nitrogen or CR.sub.6, or if Y is CR.sub.5 and Z is CR.sub.6 and X is nitrogen or CR.sub.4, then each pair of substituents R.sub.4 and R.sub.5 and R.sub.5 and R.sub.6 form a group --CH.dbd.C(R.sub.10)--C(R.sub.11).dbd.CH-- or a tetramethylene group, wherein R.sub.10 and R.sub.11 are each independently of the other hydrogen, C.sub.1 -C.sub.6 alkyl, phenyl or phenyl-C.sub.1 -C.sub.4 alkyl. The compounds are suitable for use as active components in thermal information recording systems, especially for laser-optical information recording media.