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公开(公告)号：CA2229839A1
公开(公告)日：1998-09-20
申请号：CA2229839
申请日：1998-03-19
Applicant: BASF AG
Inventor： KROLLMANN NORBERT , MERTEN ANNE-KATHRIN , ROTERMUND UDO
Abstract: The present invention relates to thermal insulation gas mixtures comprising cyclopentane and argon for filling cavities.
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公开(公告)号：ZA9610844B
公开(公告)日：1998-06-23
申请号：ZA9610844
申请日：1996-12-23
Applicant: BASF AG
Inventor： KRECH RUEDIGER , ROTERMUND UDO , BOLLMANN HEINZ , HEMPEL RENATE , SCHOLZ WOLFGANG , GENZ MANFRED
Abstract: PCT No. PCT/EP96/05639 Sec. 371 Date Nov. 18, 1998 Sec. 102(e) Date Nov. 18, 1998 PCT Filed Dec. 16, 1996 PCT Pub. No. WO97/23534 PCT Pub. Date Jul. 3, 1997A microcellular PU elastomer having improved dynamic-mechanical properties and based on an isocyanate component consisting essentially of 4,4'-MDI and also further customary constituents has, after heating at from 100 to 120 DEG C. for from 8 to 24 hours, a melting range of from 130 DEG C. as the minimum lower limit to 230 DEG C. as a minimum upper limit, measured by differential scanning calorimetry (DSC) at a heating rate of 20 DEG C./min, and a urea content of from 14 to 18% by weight. A process is also provided for preparing such a microcellular PU elastomer having improved dynamic mechanical properties. The microcellular PU elastomers can be used for producing damping elements.
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公开(公告)号：ZA9610843B
公开(公告)日：1998-06-23
申请号：ZA9610843
申请日：1996-12-23
Applicant: BASF AG
Inventor： KRECH RUEDIGER , ROTERMUND UDO , BOLLMANN HEINZ , HEMPEL RENATE , SCHOLZ WOLFGANG , GENZ MANFRED
Abstract: PCT No. PCT/EP96/05640 Sec. 371 Date Oct. 7, 1998 Sec. 102(e) Date Oct. 7, 1998 PCT Filed Dec. 16, 1996 PCT Pub. No. WO97/23535 PCT Pub. Date Jul. 3, 1997A microcellular PU elastomer having improved dynamic mechanical properties and based on an isocyanate component consisting essentially of 4,4'-MDI and further customary constituents has a physicochemical structure which, in the gel permeation chromatograph (GPC) of a solution of the microcellular polyurethane elastomer prepared at 90 DEG C. in N,N-dimethylformamide containing 1 percent of di-n-butylamine measured against polymethyl methacrylate (PMMA) as standard, displays a signal occurring in addition to low molecular weight main signal and comprising one or more peaks at an (apparent) molar mass of greater than 250,000 g/mol which becomes smaller or disappears on addition of lithium chloride to this solution, and a urea content of from 14 to 18% by weight. A process is also provided for preparing such a microcellular PU elastomer having improved dynamic mechanical properties. The microcellular PU elastomers can be used for producing damping elements.
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公开(公告)号：CA2240464A1
公开(公告)日：1997-07-03
申请号：CA2240464
申请日：1996-12-16
Applicant: BASF AG
Inventor： HEMPEL RENATE , ROTERMUND UDO , BOLLMANN HEINZ , KRECH RUEDIGER , GENZ MANFRED , SCHOLZ WOLFGANG
Abstract: The invention relates to a microcellular PU elastomer with improved dynamicmechanical characteristics, based on an isocyanate component consisting essentially of 4,4'-MDI and other standard components. The elastomer in question has a physical-chemical structure characterised by a one- or two-peak signal next to the low-molecular main signal for an (apparent) molar mass of greater than 250,000 g/mol as measured by gel-permeation chromatography from a solution of the microcellular PU elastomer produced at 90 ~C in N,Ndimethylformamide with 1 % di-n-butylamine, against polymethylmethacrylate (PMMA) as the standard, the signal being reduced or eliminated following addition of lithium chloride to this solution. The elastomer has a urea content of 14-18 wt %. Also disclosed are a process for producing such a microcellular PU elastomer with improved dynamic-mechanical characteristics and the use of said elastomer to produce damping elements.
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