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公开(公告)号：US3508687A
公开(公告)日：1970-04-28
申请号：US3508687D
申请日：1968-07-02
Applicant: HOECHST AG
Inventor： BURGSTALLER GOTTFRIED
CPC classification number: B65G65/463 , B65D88/68
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公开(公告)号：DE3270126D1
公开(公告)日：1986-04-30
申请号：DE3270126
申请日：1982-09-03
Applicant: HOECHST AG
Inventor： KUHLS JURGEN DR , WEISS EDUARD , BURGSTALLER GOTTFRIED
Abstract: A process for the continuous agglomeration of granular tetrafluoroethylene polymer powders which cannot be processed from the melt to give molding powders having a high bulk density, an improved powder flow and particle stability and a narrow particle size distribution is described. In this process, the powder to be agglomerated is first introduced uniformly into a pretreatment stage and is dispersed and pre-agglomerated in this stage in the liquid agglomeration medium, composed of water and an organic liquid capable of wetting polytetrafluoroethylene, is then agglomerated to the desired average particle diameter in an agglomeration stage and is finally treated further in an after-treatment stage in order to develop the final shape of the particles. Finally, the powder is separated from the liquid medium and is dried. This makes it possible to obtain, in an economical manner and with excellent processing properties, high-grade agglomerated molding powders of such tetrafluoroethylene polymers, in particular of such polymers which have been modified with small quantities of perfluoro-(alkyl-vinyl) ethers.
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公开(公告)号：CA1184728A
公开(公告)日：1985-04-02
申请号：CA410946
申请日：1982-09-08
Applicant: HOECHST AG
Inventor： KUHLS JUERGEN , WEISS EDUARD , BURGSTALLER GOTTFRIED
Abstract: of the disclosure: A process for the continuous agglomeration of granular tetrafluoroethylene polymer powders which cannot be processed from the melt to give molding powders having a high bulk density, an improved powder flow and particle stability and a narrow particle size distribution is described. In this process, the powder to be agglomerated is first introduced uniformly into a pretreatment stage and is dispersed and pre-agglomerated in this stage in the liquid agglomeration medium, composed of water and an organic liquid capable of wetting polytetrafluoroethylene, is then agglomerated to the desired average particle diameter in an agglomeration stage and is finally treated further in an after-treatment stage in order to develop the final shape of the particles. Finally, the powder is separated from the liquid medium and is dried. This makes it possible to obtain, in an economical manner and with excellent processing properties, high-grade agglomerated molding powders of such tetrafluoroethylene polymers, in particular of such polymers which have been modified with small quantities of perfluoro-(alkyl-vinyl) ethers.
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公开(公告)号：CA948183A
公开(公告)日：1974-05-28
申请号：CA105465
申请日：1971-02-16
Applicant: HOECHST AG
Inventor： SANBERGER LUDWIG , BURGSTALLER GOTTFRIED
Abstract: 1329177 Plate heat exchangers FARBWERKE HOECHST AG 19 April 1971 [17 Feb 1970] 21981/71 Heading F4S In a plate heat exchanger comprising separating sheets 3 disposed between adjacent grooved plates 1, 2, heat exchange between two media flowing through the grooves takes place through the separating sheets 3. The plates 1, 2 and the sheets 3 are made of polytetrafluoroethylene. The heat exchange media are led into and removed from the respective arrays of grooves in the plates via socket connections (9, 10, Fig. 4) provided in end plates 4, 8 or the heat exchanger stack. The plates 4 are of steel; the plates 8, which are of polytetrafluoroethylene, have distribution channels therein. A series arrangement, as shown, or parallel arrangement (see Fig. 2) may be used to distribute the media to the respective arrays of grooves in the stack.
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公开(公告)号：DE3015092A1
公开(公告)日：1981-10-22
申请号：DE3015092
申请日：1980-04-19
Applicant: HOECHST AG
Inventor： BURGSTALLER GOTTFRIED , FREUDENREICH REINHOLD
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Patent Agency Ranking
公开(公告)号：CA873729A
公开(公告)日：1971-06-22
申请号：CA873729D
Applicant: HOECHST AG
Inventor： BURGSTALLER GOTTFRIED
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公开(公告)号：DE3160150D1
公开(公告)日：1983-05-11
申请号：DE3160150
申请日：1981-04-09
Applicant: HOECHST AG
Inventor： BURGSTALLER GOTTFRIED , FREUDENREICH REINHOLD
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公开(公告)号：DE3135598A1
公开(公告)日：1983-03-17
申请号：DE3135598
申请日：1981-09-09
Applicant: HOECHST AG
Abstract: A process for the continuous agglomeration of granular tetrafluoroethylene polymer powders which cannot be processed from the melt to give molding powders having a high bulk density, an improved powder flow and particle stability and a narrow particle size distribution is described. In this process, the powder to be agglomerated is first introduced uniformly into a pretreatment stage and is dispersed and pre-agglomerated in this stage in the liquid agglomeration medium, composed of water and an organic liquid capable of wetting polytetrafluoroethylene, is then agglomerated to the desired average particle diameter in an agglomeration stage and is finally treated further in an after-treatment stage in order to develop the final shape of the particles. Finally, the powder is separated from the liquid medium and is dried. This makes it possible to obtain, in an economical manner and with excellent processing properties, high-grade agglomerated molding powders of such tetrafluoroethylene polymers, in particular of such polymers which have been modified with small quantities of perfluoro-(alkyl-vinyl) ethers.
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公开(公告)号：DK134273B
公开(公告)日：1976-10-11
申请号：DK342168
申请日：1968-07-12
Applicant: HOECHST AG
Inventor： BURGSTALLER GOTTFRIED
Abstract: 1,175,784. Hoppers. FARBWERKE HOECHST A.G. 15 July, 1968 [13 July, 1967], No. 33575/68. Headings B8A and B8S. Material in hopper 1, which is rotated by motor 2 engaging gear 3 and supported on rollers 4 is stirred by agitating screw 7 which moves the material upwards whilst conveyer screw 8 discharges the material downwards through shoot 9. The shaft of screw 7 is formed hollow to receive the shaft of screw 8 and the two may be driven, via a clutch 14 (not shown), together or separately to provide flexibility.
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公开(公告)号：BR8205249A
公开(公告)日：1983-08-16
申请号：BR8205249
申请日：1982-09-08
Applicant: HOECHST AG
Inventor： KUHLS JURGEN , WEISS EDUARD , BURGSTALLER GOTTFRIED
Abstract: A process for the continuous agglomeration of granular tetrafluoroethylene polymer powders which cannot be processed from the melt to give molding powders having a high bulk density, an improved powder flow and particle stability and a narrow particle size distribution is described. In this process, the powder to be agglomerated is first introduced uniformly into a pretreatment stage and is dispersed and pre-agglomerated in this stage in the liquid agglomeration medium, composed of water and an organic liquid capable of wetting polytetrafluoroethylene, is then agglomerated to the desired average particle diameter in an agglomeration stage and is finally treated further in an after-treatment stage in order to develop the final shape of the particles. Finally, the powder is separated from the liquid medium and is dried. This makes it possible to obtain, in an economical manner and with excellent processing properties, high-grade agglomerated molding powders of such tetrafluoroethylene polymers, in particular of such polymers which have been modified with small quantities of perfluoro-(alkyl-vinyl) ethers.
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