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    2.
    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.

    Compsn. for crack-free, dimensionally accurate ceramics
    4.
    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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