摘要:
The invention relates to a process for the preparation of olefin polymers using a modified Ziegler-catalyst. As modifiers cyclic dipeptides are used. Polymers are obtained in a high yield having good crystallinity and good color quality.
摘要:
CRUDE AMORPHOUS POLYOLEFINS ARE PURIFIED IN A SEQUENTIAL TREATMENT PROCESS WITH A REDUCING TYPE INORGANIC COMPOUND, A POLYPHOSPHATE, AND AN ALCOHOL. THE AMORPHOUS POLYOLEFIN ISRECOVERED AS A SAFE-TO-HANDLE, ESSENTIALLY COLOR-FREE AND CATALYST RESIDUE-FREE, USUAL MATERIAL.
摘要:
A FLUID CONTROL SYSTEM IS PROVIDED WHEREBY THE CONTINUOUS TRANSFER OF FLUID FROM A SOURCE LOCATION TO AN ULTIMATE LOCATION IS ACCOMPLISHED WHILE MAINTAINING IN THE SOURCE LOCATION A SUBSTANTIALLY CONSTANT PRESSURE AND WHILE MAINTAINING IN THE ULTIMATE LOCATION A SUBSTANTIALLY CONSTANT TEMPERATURE: BY CONTROLLING THE TRANSFER OF FLUID FROM THE SOURCE LOCATION TO THE ULTIMATE LOCATION IN RESPONSE TO THE PRESSURES IN THE SOURCE LOCATION AND IN THE TRANSFER CONDUIT CONNECTING THE SOURCE LOCATION AND THE ULTIMATE LOCATION; AND BY CONTROLLING THE HEATING OF FLUID IN THE TRANSFER CONDUIT IN RESPONSE TO THE TEMPERATURES IN ULTIMATE LOCATION AND IN THE TRANSFER CONDUIT.
摘要:
A PROCESS FOR THE SEPARATION OF ALPHA-OLEFIN POLYMERS HAVING DIFFERENT STERIC STRUCTURES WHICH COMPRISES ADJUSTING THE CONCENTRATION OF A SOLUTION OF AMORPHOUS POLYMER CONTAINING IN SUSPENSION STEREO-REGULAR CRYSTALLINE POLYMER AND SEMICRYSTALLINE STEREOBLOCK POLYMER TO 10-40 WEIGHT PERCENT OF POLYMER, CENTRIFUGING AND RECOVERING A SUBSTANTIALLY PURE STEREOREGULAR POLYMER, AND A SOLUTION OF AMORPHOUS POLYMER CONTAINING IN SUSPENSION STEREOBLOCK POLYMER, ADJUSTING, IF NECESSARY, THE CONCENTRATION OF THE LATTER SOLUTION TO 5-15 WEIGHT PERCENT POLYMER, FILTERING THE SOLUTION TO RECOVER SUBSTANTIALLY PURE STEREOBLOCK POLYMER, AND A FILRATE CONTAINING AMORPHOUS POLYMER, AND RECOVERING SUBSTANTIALLY PURE AMORPHOUS POLYMER FROM THE FILTRATE.
摘要:
In mono 1-olefin and diolefin polymerization processes, an improved method and apparatus for introducing a catalyst slurry into the polymerization zone which comprises pressurizing a catalyst slurry through a first transport zone to a second transport zone and thereafter sweeping the catalyst slurry through the second transport zone to the polymerization zone.
摘要:
A process for the conversion of olefinic hydrocarbons according to the olefin reaction (e.g., the olefin disproportionation reaction) by contacting the olefinic hydrocarbon with a catalyst comprising a coordination compound of molybdenum or tungsten complexed with NO, together with an organoaluminum adjuvant.
摘要:
A METHOD FOR THE RING OPENING POLYMERIZATION OF UNSATURATED ALICYCLIC COMPOUNDS CONTAINING AT LEAST 4 AND NOT MORE THAN 5 CARBON ATOMS AND ONE DOUBLE BOND IN THE CYCLIC RING AND UNSATURATED ALICYCLIC COMPOUNDS CONTAINING AT LEAST 8 CARBON ATOMS AND AT LEAST ONE DOUBLE BOND IN THE CYCLIC RING IS DISCLOSED WHICH COMPRISES SUBJECTING SUCH UNSATURATED ALICYCLIC COMPOUNDS TO A CATALYST SYSTEM COMPRISING (A) A TUNGSTEN OR MOLYBDENUM HALIDE OR OXYHALIDE, (B) AT LEAST ONE LEWIS ACID OF THE FORMULA MXN WHERE M IS A METAL REPRESENTED BY ALUMINUM, ZINC, GALLIUM, TIN AND ANTIMONY; X IS A HALOGEN SUCH AS BROMINE, CHLORINE, IODINE AND FLUORINE AND N IS AN INTEGER EQUAL TO THE VALENCE OF M AND (C) A REFUCING AGENT SELECTED FROM THE GROUP CONSISTING OF METALS, METAL HYDRIDES, ALKYL SECONDARY AMINES, ALKYL TERTIARY AMINES, SATURATED ALKYL ALCOHOLS, ALKYL PHOSPHINES AND HYDROGEN.
摘要:
Silane compounds of the structure H3Si(SiH2)mH and R4 nSiHn wherein m is 0 to 3 inclusive, n is 0 to 3 inclusive and R is C1 to C10 hydrocarbon are used with supported bis(cyclopentadienyl)chromium (II) catalysts for the polymerization of olefins in order to improve the productivity of the catalyst.
摘要:
IN THE POLYMERIZATION OF AN OLEFIN, E.G., PROPYLENE, EMPLOYING HYDROGEN AS A MODIFIER IN THE POLYMERIZATION REACTION AND EXCESS MONOMER AS SOLVENT TO PRODUCE A DESIRED MELT INDEX POLYMER, RECYCLED UNPOLYMERIZED OR EXCESS MONOMER IS COMPLETELY FREED OF HYDROGEN BY FRACTIONATION OF THE RECOVERED MONOMER STREAM BY SUBMITTING THE SAME TO A DEGASSING OPERATION IN WHICH IN THE PREFERRED MODE OF OPERATION THE STREAM IS HEATED IN A FRACTIONATION ZONE TO EXPEL HYDROGEN THEREFROM AND THE OVERHEAD IS REFRIGERATED TO AVOID UNDUE LOSS OF MONOMER AND ALL OF THE MODIFIER HYDROGEN IS ADDED TO THE POLYMERIZATION REACTION FROM A SINGLE SOURCE.
摘要:
THE SHELF LIFE OF A LIQUID CURABLE RESIN SYSTEM IS INCREASED BY THE ADDITION OF A HINDERED PHENOL, SUCH AS 2,6DITERTIARYBUYLPHENOL OR 2,6-DITERTIARYBURTYL-P-CRESOL. THE LIQUID CURABLE RESIN SYSTEM COMPRISES A COPOLYMER OF MALEIC ANHYDRIDE AND AN ALPHA-OLEFIN SUCH AS HEXENE-1; A LIQUID UNSATURATED MONOEPOXIDE SUCH AS GLYCIDYL ACRYLATE OR GLYCIDYL METHACRYALTE; AND STYRENE. THE SYSTEM PREFERABLY CONTAINS LESS THAN 10 P.P.M. OF WATER.