公开(公告)号：DE3015089A1

公开(公告)日：1981-10-22

申请号：DE3015089

申请日：1980-04-19

Applicant: BASF AG

Inventor： JUZA DIRK DIPL CHEM DR ,  STEIN DIETER DIPL CHEM DR

IPC: B01J8/08 ,  C08F2/34 ,  C08F4/64 ,  C08F10/06 ,  C08F110/06 ,  C08F210/06

Abstract: A process for the preparation of propylene homopolymers or copolymers by polymerizing the monomer or monomers in the gas phase in a centric stirred bed of finely divided polymer, with removal of the heat of polymerization by evaporative cooling, the temperature in the polymerization zone being regulated by measuring the temperature continuously and causing any change therein to trigger a change in the amount of liquid monomer, evaporating in the reaction zone, which is introduced per unit time, in which process (1) the radius and height of the centric stirred bed are in a particular ratio to one another, (2) the finely divided polymer in the centric stirred bed is caused to move upward in the peripheral zone of the bed and downward in the central zone of the bed, (3) the temperature in the polymerization zone is regulated by simultaneously measuring it at (3.1) one or more points of the inner part of the stirred bed and (3.2) one or more points of the outer part of the stirred bed and (4) the actual temperatures T determined simultaneously at the individual points of measurement are combined to give a temperature parameter TM and the difference of this parameter from the intended value triggers the regulating sequence, or the temperature differences DELTA T between the actual and intended temperatures, measured simultaneously at the individual points of measurement, are combined to give a difference parameter DELTA TM and this parameter triggers the regulating operation.

公开(公告)号：DE2610069A1

公开(公告)日：1977-09-22

申请号：DE2610069

申请日：1976-03-11

Applicant: BASF AG

Inventor： FAHRBACH GERHARD DIPL CHEM DR ,  GERBERDING KARL DIPL CHEM DR ,  SEILER ERHARD DIPL CHEM DR ,  STEIN DIETER DIPL CHEM DR

IPC: C08G81/02 ,  C08F297/04

公开(公告)号：DE2535093A1

公开(公告)日：1977-06-30

申请号：DE2535093

申请日：1975-08-06

Applicant: BASF AG

Inventor： ECHTE ADOLF DIPL CHEM DR ,  STEIN DIETER DIPL CHEM DR ,  GAUSEPOHL HERMANN DIPL CHEM DR

IPC: C08F212/02 ,  C08F291/02 ,  C08F12/00 ,  C08F297/00

Abstract: A vinyl aromatic cpd. is (co)polymerised, opt. in presence of a rubbery component, in presence of 0.001-0.5 (0.005-0.05) wt.%, w.r.t. monomer(s) of a cpd. (I) of formula H2C=C(R1)-CO-O-R-O-OC-C(R1)=CH2, R1 is H or (m)ethyl and R is -CnH2n-, in which n = 2-20, or -R2(O-R2-)m in which m=1-20 and R2 is 1-4C (un)branched alkylene. Polymers with the same index of viscosity may be obtd. at higher polymerisation temp. The monomer is esp. styrene and substd. styrenes. Claimed I are butane diol diacrylate and di(m)ethacrylate. In an example, polystyrene was obtd. at 0.154 kg/litre/hour in presence of butane diol diacrylate, and at 0.0812 in absence of the acrylate.

公开(公告)号：DE2457740A1

公开(公告)日：1976-06-16

申请号：DE2457740

申请日：1974-12-06

Applicant: BASF AG

Inventor： FALKENSTEIN GEORG DIPL CHEM DR ,  STEIN DIETER DIPL CHEM DR ,  HAAF FRANZ DIPL CHEM DR ,  HEINZ GERHARD DIPL CHEM DR ,  SCHOEN ERNST DIPL CHEM DR

IPC: C08G18/62 ,  C08L75/04 ,  C08G18/63

Abstract: (Cellular)polyurethanes are prepd. from a mixt. of A) >=1 polyisocyanate, B) >=1 polyhydroxy cpd. of ave.mol.wt. 500-7,000 chosen from polyether- and polyester-polyols and opt. D) other conventional additives, the novelty being that a polymer (C) is included in the mixt.; C) is a (partially crosslinked polymer of particle size 500-5,000 angstroms which is dispersed in B) in an amt. of 1-40wt.%. The mixt. has low viscosity improving the workability. The use of the crosslinked polymer improves the solvent resistance of the polyurethanes and their physical characteristics esp. tensile strength/load capacity, compression strength, tear strength, low temp. flexibility, etc., are enhanced. As lacquers, elastomers, flexible and rigid foams. The foam may be used for (car)upholstery, crash pads, shoe soles, etc.

公开(公告)号：DE2457727A1

公开(公告)日：1976-06-16

申请号：DE2457727

申请日：1974-12-06

Applicant: BASF AG

Inventor： FALKENSTEIN GEORG DIPL CHEM DR ,  STEIN DIETER DIPL CHEM DR ,  HAAF FRANZ DIPL CHEM DR ,  HEINZ GERHARD DIPL CHEM DR ,  SCHOEN ERNST DIPL CHEM DR

IPC: C08G18/62 ,  C08L75/04 ,  C08G18/63

Abstract: (Cellular)polyurethanes are prepd. from a mixt. of A) >=1 polyisocyanate, B) >=1 polyhydroxy cpd. of ave.mol.wt. 500-7,000 chosen from polyether-and polyester-polyols and opt. D) other conventional additives the novelty being that a polymer (C) is included in the mixt.; C) is a (partially) crosslinked polymer of particle size 500-5,000 angstroms which is dispersed in B) in an amt. of 1-40wt.%. The mixt. has low viscosity improving the workability. The use of the crosslinked polymer improves the solvent resistance of the polyurethanes and their physical characteristics esp. tensile strength, load capacity, compression strength, tear strength, low temp. flexibility etc., are enhanced. The polyurethanes may be used as lacquers, elastomers, flexible and rigid foams. The foams may be used for (car) upholstery, crash pads, shoe soles, etc.

公开(公告)号：DE2424374A1

公开(公告)日：1975-12-11

申请号：DE2424374

申请日：1974-05-20

Applicant: BASF AG

Inventor： WURMB ROLF DIPL CHEM DR ,  KUNDE JOACHIM DIPL CHEM DR ,  STEIN DIETER DIPL CHEM DR ,  GAUSEPOHL HERMANN DIPL CHEM DR ,  THEYSOHN RAINER DIPL CHEM DR

IPC: C08K7/02 ,  C08L25/04 ,  C08K5/01