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    81.
    发明专利
    未知

    公开(公告)号：FI873677A

    公开(公告)日：1988-02-28

    申请号：FI873677

    申请日：1987-08-25

    Applicant: HOECHST AG

    Inventor： PEIFFER HERBERT ,  CRASS GUENTHER ,  DIETZ WOLFGANG

    IPC: B29C47/88 ,  B29L7/00 ,  B29C

    Abstract: A molten film extruded from a slot die onto a take-off drum in a cooling system is first cooled on the circumferential surface of the take-off drum and by the ambient air, is subsequently passed into the water bath of a water trough in which the take-off drum is immersed, and finally is transferred from the water bath of the water trough into a post-cooling water bath, in which the film solidifies to an intermediate film having a desired final temperature of approximately 40 DEG C. When the film leaves the take-off drum, the partially solidified molten film has a mean temperature Tu of between 100 DEG C. and 120 DEG C. For optimization of the dwell time of the molten film in the cooling system and in the post-cooling water bath, the drum diameter D of the take-off drum and the length L of the post-cooling water bath are determined by a specific relationship.

    Biaxially oriented polypropylene film having improved mechanical and barrier properties
    85.
    发明专利
    Biaxially oriented polypropylene film having improved mechanical and barrier properties 未知

    公开(公告)号：AU717452B2

    公开(公告)日：2000-03-23

    申请号：AU5465596

    申请日：1996-05-30

    Applicant: HOECHST AG

    Inventor： PEIFFER HERBERT ,  BUSCH DETLEF ,  DRIES THOMAS ,  SCHLOGL GUNTER ,  WINTER ANDREAS

    IPC: B29C47/06 ,  B29C55/12 ,  B29K23/00 ,  B29L7/00 ,  B29L9/00 ,  B32B27/18 ,  B32B27/32 ,  C08F8/00 ,  C08F10/06 ,  C08J5/18 ,  C08L23/10 ,  C08J5/22 ,  C08F110/06

    Abstract: Biaxially oriented polypropylene film with at least one base layer contg. polypropylene has (a) isotactic block length between two structural defects of more than 40 (statistical average), (b) n-heptane-insol. component of the polypropylene with an isotacticity (by C-NMR spectrometry) of at least 95%, (c) mol. wt. ratio Mw/Mn of less than 4 and (d) polypropylene contg. less than 1% n-heptane-soluble component. Also claimed is a process for the prodn. of this film. Pref. the base layer (A) has elastic moduli of more than 2400 and more than 3800 N/mm in the machine direction and transverse direction respectively. (A) contains polypropylene in which the heptane-insol. component has an isotacticity of at least 96%, pref. at least 97%, and a Mw/Mn ratio of less than 3.0, pref. less than 2.7. The film may have outer layer(s) (B) of olefinic polymer on one or pref. both sides and interlayer(s) (C) of olefinic polymer between base and outer layers. Layer (A) contains an antistatic agent, (B) contain(s) lubricants and/or antiblocking agents, and (A), (B) and/or (C) contain neutralising agents and/or stabilisers; interlayer(s) (C) may contain neutralising agents, stabilisers, antistatics and/or antiblocking agents. Layers (B) may or may not be sealable. The total film thickness is 4-100 microns, with the base layer (A) making up 40-60% of this. Alternatively, the film may consist of a single layer.

    Biaxially oriented polypropylene film having improved water vapor and oxygen barrier properties
    87.
    发明专利
    Biaxially oriented polypropylene film having improved water vapor and oxygen barrier properties 未知

    公开(公告)号：AU717316B2

    公开(公告)日：2000-03-23

    申请号：AU5466096

    申请日：1996-05-30

    Applicant: HOECHST AG

    Inventor： PEIFFER HERBERT ,  BUSCH DETLEF ,  DRIES THOMAS ,  SCHLOGL GUNTER ,  WINTER ANDREAS

    IPC: B29C47/06 ,  B29C55/12 ,  B29K23/00 ,  B29L7/00 ,  B32B27/18 ,  B32B27/32 ,  C08F8/00 ,  C08F10/06 ,  C08J5/18 ,  C08L23/10 ,  C08F110/06 ,  C08J5/22

    Abstract: A biaxially-oriented polypropylene film has at least one base layer contg. polypropylene with the following properties: (i) a statistical ave. for the isotactic block length between 2 chain breaks of at least 40; (ii) an n-heptane insols. fraction having a chain-isotacticity index (measured by 13C NMR spectroscopy) of at least 95 (esp. at least 97)%; (iii) an Mw/Mn ratio below 4, esp. below 2.7; (iv) an n-heptane soluble fraction below 1%; and (v) a water vapour transmission no more than 24/micron thickness Äg/m .dÜ and an O2 transmission no more than 34,000/meter thickness Äcm /(m .d.bar)Ü. Claimed prodn. is by multi-layer melt extrusion, followed by cooling on a roller and orienting at ratios 3-9:1 lengthwise and 4-12:1 transversely. Pref. the film is 4-100 microns thick,being solely of the above polypropylene layer(s) or having its thickness 40-60% made up of such layer(s). Any other layers (on one or both sides of the polypropylene base layer(s) are of polyolefins which can be heat-sealable. The various layers can also contain neutralising agents, stabilisers, antistats and/or anti-blocking agents. Appropriate polypropylene for the base layer(s) is obtd. using metallocene catalysts.

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