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    2.
    发明专利
    未知

    公开(公告)号：DE4118277A1

    公开(公告)日：1992-12-10

    申请号：DE4118277

    申请日：1991-06-04

    Applicant: BASF AG

    Inventor： STERZEL HANS-JOSEF DR ,  MEYER MARION DR

    IPC: B29C43/00 ,  B29C43/10 ,  B29C67/24 ,  C08J9/24 ,  C08J9/26

    Abstract: A process for the thermoplastic processing and sintering of non-plasticisable polymers, characterised in that the pulverulent, non-plasticisable polymers are dispersed in a melt of a polyacetal or a mixture of polyacetals, the resultant mixture is cooled and granulated, the granules are fed to thermoplastic processing, mouldings are produced by injection moulding or films or profiles are produced by extrusion, the mouldings are exposed to an atmosphere containing an acidic gas, thus depolymerising the polyacetal, and the porous moulding which remains is covered on all sides by a gas/liquid-impermeable film, heated in an autoclave and sintered isostatically under pressure on all sides to give the finished part.

    4.
    发明专利
    未知

    公开(公告)号：DE59203084D1

    公开(公告)日：1995-09-07

    申请号：DE59203084

    申请日：1992-05-19

    Applicant: BASF AG

    Inventor： STERZEL HANS-JOSEF DR ,  MEYER MARION DR

    IPC: B29C43/00 ,  B29C43/10 ,  B29C67/24 ,  C08J9/24 ,  C08J9/26

    Abstract: A process for the thermoplastic processing and sintering of non-plasticisable polymers, characterised in that the pulverulent, non-plasticisable polymers are dispersed in a melt of a polyacetal or a mixture of polyacetals, the resultant mixture is cooled and granulated, the granules are fed to thermoplastic processing, mouldings are produced by injection moulding or films or profiles are produced by extrusion, the mouldings are exposed to an atmosphere containing an acidic gas, thus depolymerising the polyacetal, and the porous moulding which remains is covered on all sides by a gas/liquid-impermeable film, heated in an autoclave and sintered isostatically under pressure on all sides to give the finished part.

    5.
    发明专利
    未知

    公开(公告)号：DE59101468D1

    公开(公告)日：1994-06-01

    申请号：DE59101468

    申请日：1991-02-14

    Applicant: BASF AG

    Inventor： STERZEL HANS-JOSEF DR ,  TER MAAT JOHAN HERMAN HENDRIK ,  EBENHOECH JOHAN DR ,  MEYER MARION DR

    IPC: C04B35/632 ,  C04B35/00 ,  C04B35/634 ,  C08L59/00 ,  C08L63/00 ,  C08L71/00 ,  C08L75/04 ,  C08L77/00

    Abstract: Thermoplastic compositions for the production of ceramic mouldings, containing A) 40-65% by volume of a sinterable, inorganic, non-metallic powder, B) 35-60% by volume of a mixture of B1) 70-90% by weight of a polyoxymethylene homopolymer or copolymer containing up to 10 mol% of comonomer units, and B2) 10-30% by weight of a polyoxymethylene copolymer having a comonomer content of from 20 to 99 mol% of poly-1,3-dioxolane, poly-1,3-dioxane or poly-1,3-dioxepane, or of a polymer homogeneously dissolved in B1) or dispersed in B1) with a mean particle size of less than 1 mu m, or mixtures thereof, as binder, and C) 0-5% by volume of a dispersion aid.

    8.
    发明专利
    未知

    公开(公告)号：ES2075530T3

    公开(公告)日：1995-10-01

    申请号：ES92108390

    申请日：1992-05-19

    Applicant: BASF AG

    Inventor： STERZEL HANS-JOSEF DR ,  MEYER MARION DR

    IPC: B29C43/00 ,  B29C43/10 ,  B29C67/24 ,  C08J9/24 ,  C08J9/26

    Abstract: A process for the thermoplastic processing and sintering of non-plasticisable polymers, characterised in that the pulverulent, non-plasticisable polymers are dispersed in a melt of a polyacetal or a mixture of polyacetals, the resultant mixture is cooled and granulated, the granules are fed to thermoplastic processing, mouldings are produced by injection moulding or films or profiles are produced by extrusion, the mouldings are exposed to an atmosphere containing an acidic gas, thus depolymerising the polyacetal, and the porous moulding which remains is covered on all sides by a gas/liquid-impermeable film, heated in an autoclave and sintered isostatically under pressure on all sides to give the finished part.

    Compsn. for crack-free, dimensionally accurate ceramics
    10.
    发明专利
    Compsn. for crack-free, dimensionally accurate ceramics 未知

    公开(公告)号：DE4021741A1

    公开(公告)日：1992-01-09

    申请号：DE4021741

    申请日：1990-07-07

    Applicant: BASF AG

    Inventor： STERZEL HANS-JOSEF DR ,  EBENHOECH JOHAN DR ,  MEYER MARION DR

    IPC: C04B35/634 ,  C08L59/00 ,  C08L63/00 ,  C08L71/00 ,  C08L75/04 ,  C08L77/00

    Abstract: Thermoplastic compsn. for use in the mfr. of ceramic shaped articles comprises: (A) 40-65 vol% of a sinterable, inorganic, non-metallic powder; (B) 35-60 vol% of a binder comprising (B1) 70-90 wt.% of a polyoxymethylene homo- or co-polymer contg. up to 10 mol% comonomer units; and (B2) 10-30 wt.% of (i) a polyoxymethylene copolymer with a comonomer content of 20-99 mol% poly-1,3-dioxolane, poly-1,3-dioxane or poly-1,3-dioxepan or (ii) a polymer which is homogeneously dissolved in (B1) and/or a polymer which is dispersed as particles of ave. size below 1 micron in (B1); and (C) 0-5 vol% of a dispersing aid. Also claimed is the de-bindering subsequent to injection moulding or extrusion by treating at 20-160 deg.C for 0.1-24 hrs. in a gaseous acid-contg. atmos. when (B2(i)) is used or by treating in such at atmos. at 20-180 deg.C for 0.1-24 hrs., followed by heating at 250-500 deg.C for 0.1-12 hrs. when (B2(ii)) is used. Powder (A) is pref. Al203, Zr02, Y203, SiC, Si3N4, TiB and/or AlN. Component (B2(ii)) of the binder is pref. an aliphatic polyurethane, aliphatic non-crosslinked polyepoxide, poly(2-6C alkylene oxide), aliphatic polyamide and/or a polyacrylate.

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