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公开(公告)号：DE3234174A1
公开(公告)日：1984-03-15
申请号：DE3234174
申请日：1982-09-15
Applicant: BASF AG
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公开(公告)号：DE3231797A1
公开(公告)日：1984-03-01
申请号：DE3231797
申请日：1982-08-26
Applicant: BASF AG
Inventor： SADLOWSKI JUERGEN DR , WALTER MANFRED DR , HILT ALBRECHT DR
Abstract: A process for the isolation of trioxane from trioxane-containing oxymethylene polymers comprises the following process steps: A) trioxane vapours are removed in gas form from the oxymethylene polymer in a degassing zone at a temperature between 70 and 300 DEG C and a pressure between 0.005 and 50 bar without any solvent or inert gas being added; B) the trioxane vapours are diverted through a vapour line, the vapour temperature being kept above the condensation point; C) if necessary, the trioxane vapours are compressed to a pressure above 1 bar in a compression zone and kept at this pressure at a temperature above the condensation point of the vapours; D) gaseous trioxane is condensed from the vapours in a condensation zone at a pressure above 1 bar, it being possible to remove uncondensed impurities, in particular formaldehyde, in gaseous form; E) if necessary, the trioxane is purified in a purification zone.
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公开(公告)号：DE59302659D1
公开(公告)日：1996-06-27
申请号：DE59302659
申请日：1993-06-16
Applicant: BASF AG
Inventor： WITT MICHAEL DR , WALTER MANFRED DR
Abstract: Bead-formed expandable styrene polymers are obtained by suspension polymerisation of styrene with addition of from 1 to 10% by weight of C3- to C7-hydrocarbons and/or carbon dioxide as blowing agent and optionally conventional additives, where the suspension stabiliser used is a mixture of magnesium pyrophosphate, a sulphonate group-containing extender and an alkali or alkaline-earth metal carboxylate, magnesium pyrophosphate being prepared directly before the polymerisation by combining an aqueous solution with an alkali metal pyrophosphate with at least the stoichiometrically necessary amount of a magnesium salt.
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公开(公告)号：AT135386T
公开(公告)日：1996-03-15
申请号：AT91119699
申请日：1991-11-19
Applicant: BASF AG
Inventor： WALTER MANFRED DR , HUSEMANN WOLFRAM DR , NAEGELE DIETER DR
Abstract: Expandable styrene polymers of high expandability comprise a) a styrene polymer having a viscosity, measured in toluene, of from 55 to 80 [ml/g] and a melt flow index MFI (190 DEG C., 3.8 kp) of from 7.5 to 30 [g/10 min], b) from 1 to 10% by weight, based on a), of a C3- to C6-hydrocarbon as blowing agent, and, if desired, c) conventional assistants in effective amounts.
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公开(公告)号：DE59204561D1
公开(公告)日：1996-01-18
申请号：DE59204561
申请日：1992-07-03
Applicant: BASF AG
Inventor： WALTER MANFRED DR
Abstract: The invention relates to an expandable styrene polymer, comprising (a) a styrene polymer, (b) from 1 to 10% by weight, based on (a), of a blowing agent or blowing agent mixture, (c) from 0.02 to 0.25% by weight, based on (a), of a first coating containing a coating composition comprising (c1) a bisamide made from a C2-C8-alkylenediamine and an aliphatic C6-C20-carboxylic acid and (c2) a conventional antistatic, in a (c1):(C2) weight ratio of from 1 to 50, and, if desired, further coating compositions or coating composition mixtures and conventional additives in effective amounts, and to a process for the preparation of screen fractions of bead-form, expandable styrene polymers prepared by suspension polymerization.
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Patent Agency Ranking
公开(公告)号：ES2077122T3
公开(公告)日：1995-11-16
申请号：ES91112581
申请日：1991-07-26
Applicant: BASF AG
Inventor： WALTER MANFRED DR , WASSMER KARL-HEINZ DR , LORENZ MARIA DR
Abstract: Bead-form, antistatic, expandable styrene polymers containing …… a) a styrene polymer, … b) from 0.5 to 3% by weight, based on a), of a coating containing …… b1)from 10 to 70% by weight of finely divided silica, … b2)from 20 to 80% by weight of a hydroxyl-containing quaternary ammonium salt and, if desired, … b3)from 0.05 to 20% by weight of a conventional adhesion promoter and … b4)from 10 to 30% by weight of a conventional agent for shortening the cooling time, …… c) from 1 to 8% by weight, based on a), of a C3- to C6-hydrocarbon as blowing agent, and, if desired, … d) conventional additives in effective amounts. …
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公开(公告)号：DE59106578D1
公开(公告)日：1995-11-02
申请号：DE59106578
申请日：1991-07-26
Applicant: BASF AG
Inventor： WALTER MANFRED DR , WASSMER KARL-HEINZ DR , LORENZ MARIA DR
Abstract: Bead-form, antistatic, expandable styrene polymers containing …… a) a styrene polymer, … b) from 0.5 to 3% by weight, based on a), of a coating containing …… b1)from 10 to 70% by weight of finely divided silica, … b2)from 20 to 80% by weight of a hydroxyl-containing quaternary ammonium salt and, if desired, … b3)from 0.05 to 20% by weight of a conventional adhesion promoter and … b4)from 10 to 30% by weight of a conventional agent for shortening the cooling time, …… c) from 1 to 8% by weight, based on a), of a C3- to C6-hydrocarbon as blowing agent, and, if desired, … d) conventional additives in effective amounts. …
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公开(公告)号：DE3628561C2
公开(公告)日：1994-11-10
申请号：DE3628561
申请日：1986-08-22
Applicant: BASF AG
Inventor： GOERRISSEN HEINER DR , SAENGER DIETRICH DR , SCHUETTE WILHELM DR , WALTER MANFRED DR
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公开(公告)号：ES2052808T3
公开(公告)日：1994-07-16
申请号：ES89108685
申请日：1989-05-13
Applicant: BASF AG
Inventor： WEBER HEINZ DR , NINTZ ECKHARD DR , WALTER MANFRED DR , BALLWEBER DIETER , OSTERMAYER BERTRAM DR
Abstract: Expandable polymers in particle form for the preparation of foams having high heat distortion resistance contain from 20 to 94.9% by weight of a styrene polymer, from 0.1 to 75% by weight of a polyphenylene ether and from 5 to 20% by weight of a blowing agent mixture of aliphatic or cycloaliphatic hydrocarbons on the one hand and aromatic hydrocarbons, alcohols, ketones, ethers, esters and/or chlorohydrocarbons on the other hand.
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公开(公告)号：DE4123252A1
公开(公告)日：1993-01-14
申请号：DE4123252
申请日：1991-07-13
Applicant: BASF AG
Inventor： WALTER MANFRED DR
Abstract: The invention relates to an expandable styrene polymer, comprising (a) a styrene polymer, (b) from 1 to 10% by weight, based on (a), of a blowing agent or blowing agent mixture, (c) from 0.02 to 0.25% by weight, based on (a), of a first coating containing a coating composition comprising (c1) a bisamide made from a C2-C8-alkylenediamine and an aliphatic C6-C20-carboxylic acid and (c2) a conventional antistatic, in a (c1):(C2) weight ratio of from 1 to 50, and, if desired, further coating compositions or coating composition mixtures and conventional additives in effective amounts, and to a process for the preparation of screen fractions of bead-form, expandable styrene polymers prepared by suspension polymerization.
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