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公开(公告)号：DE2613352A1
公开(公告)日：1977-10-06
申请号：DE2613352
申请日：1976-03-29
Applicant: BASF AG
Inventor： WALTER MANFRED DIPL CHEM DR , STEIN DIETER DIPL CHEM DR , FAHRBACH GERHARD DIPL CHEM DR , JUNG RUDOLF H DIPL CHEM DR , ECHTE ADOLF DIPL CHEM DR
IPC: C08F291/00 , C08F279/02 , C08F291/02
Abstract: A process for the manufacture of high impact and translucent polystyrene, in which, in a first stage, styrene is prepolymerized in mass or in solution in the presence of a rubber, and the polymerization is then completed in mass, in solution or in aqueous suspension. The prepolymerization is taken to a stage where the amount of styrene converted is from 3 to 10 times the amount of the elastomer constituent of the rubber, and at this conversion the disperse soft-component phase formed should have a mean particle size of less than 1 mu m and should contain from 35 to 65% by weight of free or chemically bonded polystyrene segments. The translucent styrene polymers of high impact strength may be used for packaging purposes.
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公开(公告)号：DE3044118A1
公开(公告)日：1982-06-24
申请号：DE3044118
申请日：1980-11-24
Applicant: BASF AG
Abstract: Polyacetal molding materials which contain, as a stabilizer, from 0.1 to 10% by weight of a melamine resin, the latter being a melamine-formaldehyde condensate, having a mean degree of polymerization of from 1.2 to 6.0 and a melamine:formaldehyde ratio of from 1:2 to 1:5.5, which has been partially etherified with a C1-C4-alkanol so that the ratio melamine:ether radicals is from 1:1.5 to 1:5.0 and the ratio melamine:free methylol groups is from 1:0.5 to 1:3. The molding materials can be converted to moldings which can be used industrially at elevated ambient temperatures.
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公开(公告)号：DE3147309A1
公开(公告)日：1983-06-01
申请号：DE3147309
申请日：1981-11-28
Applicant: BASF AG
Abstract: Oxymethylene polymers are prepared by a continuous process, by mass polymerization of the monomers with the aid of conventional, preferably cationic, initiators, wherein the monomers as well as the resulting polymer are present substantially in molten form during the polymerization.
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公开(公告)号：DE3207773A1
公开(公告)日：1982-09-16
申请号：DE3207773
申请日：1982-03-04
Applicant: BASF AG
Abstract: The invention relates to a process for the continuous bulk polymerisation of trioxane with the aid of cationic polymerisation initiators in a plurality of zones: in the first polymerisation zone A, liquid trioxane is polymerised to a conversion of from 30 to 80% at a pressure of from 2 to 100 bar and at a temperature at the exit to the zone of from 116 to 160 DEG C; in a decompression zone B, the resultant suspension is decompressed to atmospheric pressure, during which from 10 to 60% of the trioxane originally employed evaporates; in a second polymerisation zone C, the polymerisation is continued at a temperature of from 65 to 115 DEG C.
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Patent Agency Ranking
公开(公告)号：DE2942182A1
公开(公告)日：1981-05-07
申请号：DE2942182
申请日：1979-10-18
Applicant: BASF AG
Abstract: Particulate styrene polymers which contain a blowing agent and are surface-coated with a glycerol dialkyl ether, preferably mixed with a glycerol ester. The particles can be foamed, and the foamed particles can be fused to form moldings.
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公开(公告)号：DE2655808A1
公开(公告)日：1978-06-15
申请号：DE2655808
申请日：1976-12-09
Applicant: BASF AG
Inventor： WALTER MANFRED DIPL CHEM DR
Abstract: Particulate self-extinguishing moulding compsns. (A) consist of blowing agent-contg. styrene polymer particles, flame-proofed by coating with an organic Br cpd. having formula (I): (where X are 1-12C aliphatic, aromatic, cycloaliphatic or araliphatic gps. and n is 0 or 1) (A) are used for preparing foams having bulk density 5-100 (10-50) g/l. In an example polystyrene granulate, contg. 6.4% pentane and having average particle dia. 1.5 mm, was coated with powdery bis-tribromomethyl-thiadiazole.
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公开(公告)号：DE3214982A1
公开(公告)日：1983-10-27
申请号：DE3214982
申请日：1982-04-22
Applicant: BASF AG
Inventor： BRANDSTAETTER FRANZ DIPL CHEM , SIMAK PETER DIPL CHEM DR , SADLOWSKI JUERGEN DIPL ING DR , WALTER MANFRED DIPL CHEM DR , ZIEGLER WALTER DIPL CHEM DR
IPC: C08G81/02 , C08L9/00 , C08L23/08 , C08L25/04 , C08L53/02 , C08L69/00 , C08L71/12 , C08F220/26 , C08F293/00
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公开(公告)号：DE3030053A1
公开(公告)日：1982-03-25
申请号：DE3030053
申请日：1980-08-08
Applicant: BASF AG
Inventor： HAHN KLAUS DIPL CHEM DR , RATH HANS PETER DIPL CHEM DR , KRAPF HEINZ DIPL CHEM DR , DEGRAVE ISIDOR DIPL PHYS DR , WALTER MANFRED DIPL CHEM DR
Abstract: Particulate styrene polymers which contain a blowing agent and are surface-coated with from 0.05 to 1% by weight of an ester. The coating agent is a hydroxycarboxylic acid ester, or an ester of a carboxylic acid with an oxyalkylated alcohol; tristearyl citrate is a preferred ester. The styrene polymers can be used to produce foam moldings, with short mold dwell times and good welding of the foam particles.
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公开(公告)号：DE2705696A1
公开(公告)日：1978-08-17
申请号：DE2705696
申请日：1977-02-11
Applicant: BASF AG
Abstract: Parent patent, the prepn. of finely divided expandable styrene polymers comprises allowing organic Br cpds. contg. >=3 aliphatically or cycloaliphatically bonded Br atoms in mol., to act on the expandable polystyrene particles above their softening point. The time available for Br cpd. diffusion into polymer particle is limited so that only a small marginal zone is reached by the Br cpd. In this addn., organic Br cpds., (I), are used which release 0.02-0.6 (0.1-0.3) mol. HBr for each Br equiv. in mol., when hydrolysed 3 hrs. at 100 degrees C in a 1 wt. % soln. in distilled water. Hydrolysis rate of (I) leads to optimum diffusion rate of Br cpd. into polymer particle.
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