公开(公告)号：AU717318B2

公开(公告)日：2000-03-23

申请号：AU5465496

申请日：1996-05-30

Applicant: HOECHST AG

Inventor： PEIFFER HERBERT ,  BUSCH DETLEF ,  DRIES THOMAS ,  SCHLOGL GUNTER ,  WINTER ANDREAS ,  KOCHEM KARL-HEINZ

IPC: B29C47/06 ,  B29C55/12 ,  B29K7/00 ,  B29K23/00 ,  B32B27/18 ,  B32B27/32 ,  C08F8/00 ,  C08F10/06 ,  C08J5/18 ,  C08L23/10 ,  C08F110/06 ,  C08J5/22

Abstract: Biaxially oriented polypropylene (PP) film comprises base ply (or plies) contg. PP having the following properties: (i) a mean isotactic block length of the PP mol. between 2 structural chain defects of, as statistical average, greater than 40; (ii) chain isotactic index for n-heptane-insol. fraction of PP of at least 95%, measured by means of C-NMR spectroscopy; (iii) ratio of wt. average Mw to the number average Mn of the mol. wt. distribution of less than 4; (iv) an n-heptane-soluble fraction of PP of less than 1%; and (v) film shrinkage in the longitudinal direction and in the transverse direction of less than 5%. Also claimed are: (a) a process for the prodn. of the above PP film; (b) the use of the PP film as a packaging film ; (c) the use of the PP film as a laminating film.

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.