Abstract:
A process for the modification of alpha -olefin (co)polymers to introduce branching, is disclosed. More particularly, the present invention relates to a process of branching alpha -olefins by contacting said alpha -olefins with a peroxide compound containing an activated unsaturated group at a temperature above 120 DEG C. The process may be carried out under a nitrogen atmosphere or in the melt form under an oxygen-containing atmosphere.
Abstract:
Novel polymeric peroxycarbonates are disclosed. Also disclosed are initiator compositions comprising one or more of the above-identified polymeric peroxycarbonates and a process for making these polymeric peroxycarbonates.
Abstract:
Use of a porous, preferably dimensionally stable, material for the extraction of hydrophobic constituents, such as benzene, toluene, xylene and/or chlorinated hydrocarbons, from an aqueous solution, the material containing a hydrophobic substance exhibiting great affinity for the constituents to be extracted from the water, characterised in that the material has a surface which will be wetted more readily by the hydrophobic substance immobilised in the pores having an average diameter in the range of 0.1 to 50 (my)m than by the aqueous solution, with the proviso that at least 60 % of this substance can be extracted from the pores by a liquid wholly made up of the constituents to be extracted.
Abstract:
The invention relates to a non-linear optically active polyurethane comprising a polymeric main chain and a donor-(pi)-acceptor sidegroup, with the sidegroup comprising a rigid donor group which is also part of the polymeric main chain. By incorporating rigid donor groups into the non-linear optically active polyurethane a high glass transition temperature (Tg above 170 C) is obtained, and hence increased thermal stability. The invention further relates to non-linear optically active polyurethanes having a Tg above 170 C, and to non-linear optically active waveguides comprising non-linear optically active polyurethanes according to the invention. Suitable rigid donor groups include nitrogen- or sulphur-containing alicyclic groups. In particular, dihydroxy pyrrolidine groups in which the nitrogen atom is directly coupled to the (pi)-acceptor group and dithiafulvene groups were found to be highly suitable for obtaining non-linear optically active polyurethanes of good thermal stability and polarizability.
Abstract:
Disclosed is a method of obtaining an aqueous pharmaceutical composition containing 50 miligrams or more per milliliter of composition a compound of the formula: H-MetO2-Glu-His-Phe-D-Lys-Phe-OH. The composition is surprisingly stable in comparison to aqueous compositions containing less of the compound, and has a greater intranasal bioavailability.
Abstract:
Process for treating a substrate, namely a fibre or a fibrous product, with a superabsorbent material, in which process there is applied to the surface of the substrate, which is not an aramid fibre, a layer of a water-in-oil emulsion which contains a superabsorbent material in its aqueous phase, so that there is applied to the substrate, calculated on its dry weight, 0.3 to 40 wt.% of the superabsorbent material, after which the liquid constituents of the emulsion are wholly or partially removed from the substrate.
Abstract:
A process is disclosed for preparing tertiary butylamine. Isobutene and ammonia are reacted with a special silica-alumina catalyst in very specific conditions, so that the tert-butylamine thus obtained has at least 99.5 % purity and can thus be directly used (further processed) without being finely distilled, once the low boiling educts have been separated (recycled).
Abstract:
Blends of a poly(ethylene terephthalate) matrix and a thermotropic liquid crystalline segmented block copolymer comprising rod (e.g., aromatic ester mesogen units containing flexible alkylene spacers) and flexible coil polymer blocks of poly(butylene terephthalate) can be used as molding compositions or in the formation of fibers and films.
Abstract:
The invention relates to a polymeric optical amplifier doped with lanthanide ions, which are present in the amplifier in the form of a complex. The invention also relates to novel electrically neutral lanthanide complexes which can be applied with advantage in the above-described polymeric optical amplifiers. These complexes comprise host molecules which readily complex with the lanthanide and fully encapsulate it.
Abstract:
The present invention relates to a tire wherein at least one of the tread, steel-cord skim stock, sidewall and carcass portions contains a rubber composition formed by curing a blend of a. natural rubber, polyisoprene or a mixture thereof, b. butadiene rubber, styrene-butadiene rubber or a mixture thereof, c. carbon black, d. activator, e. zinc oxide, f. sulfur or a sulfur donor, and g. curing accelerator, characterized in that said rubber composition has a heat buildup of 20-35 DEG C. These tires exhibit one or more improvements in a wide variety of properties. The present invention relates also to a belt which contains such a rubber composition, characterized in that said rubber composition has a heat buildup of 10-25 DEG C. These belts exhibit also one or more improvements in a variety of properties.