| 摘要 |
An extruded air cooled blown film having
a) a total thickness of 5 to 500 μm,b) a mono-layer structure or 2 to 9 coextruded layers,c) at least one layer L containing a polymer selected from the group consisting of polypropylene homopolymers, polypropylene random copolymers, hetero-phasic polypropylene block copolymers, or any mixtures thereof, said polymer having a melt flow rate, according to ASTM D-1238, of 0.1 to 10 dg/min at 230° C. and 2.16 kg, said layer L further containing 0.001 to 2%, relative to the weight of the polymer, of a particular nucleating agent, and optionallyd) a Modulus according to EN ISO 527 enhanced by at least 10% versus a reference film without the nucleating agent. |
| 主权项 |
1. A method for the manufacture of an extruded air cooled blown film with an industrial blown film line comprising
I) admixing a nucleating agent of formula (IA), (IB) or (IC) with a polymer selected from the group consisting of polypropylene homopolymer, polypropylene random copolymer, hetero-phasic polypropylene block copolymer and mixtures thereof in a batch-wise or continuous manner, II) melt extruding the admixture on a single- or twin-screw extruder to achieve homogeneity within the resulting melt at a temperature of at least 20° C. above the melting point of the polymer, III) pressing said melt or combining the melt-feed of two or more polymers, optionally from separate extruders, through the ring-shaped opening of a circular die to form a continuous cylinder of 0.1 to 5 mm wall thickness, IV) expanding said cylinder into a bubble at a blow-up ratio of 1.5 to 8 and drawing simultaneously at a stretching ratio of 2 to 40 and V) air cooling of said bubble to form the blown film, where in step I) 0.001% to 2% of the nucleating agent, relative to the weight of the of the polymer are admixed and where the polymer has a melt flow rate, according to ASTM D1238, of 0.1 to 10 dg/min at 230° C. and 2.16 kg, where the resulting blown film has a total thickness of 5 to 500 μm and comprises a mono-layer or 2 to 9 coextruded layers and comprises at least one polypropylene layer L containing the admixture and where the nucleating agents of formula (IA), (IB) or (IC) are wherein x and y are an integer from 2 to 6; z′ and z″ independently of one another are an integer from 1 to 5 with the proviso that the sum of z′ and z″ is an integer from 2 to 6; X0 is a residue which is formed by elimination of x carboxyl groups of a saturated or unsaturated aliphatic polycarboxylic acid having 3 to 25 carbon atoms, a residue which is formed by elimination of x carboxyl groups of a saturated or unsaturated alicyclic polycarboxylic acid having 7 to 25 carbon atoms or a residue which is formed by elimination of x carboxyl groups of an aromatic polycarboxylic acid having 8 to 25 carbon atoms; any of said polycarboxylic acids optionally contains further hetero atoms in its skeleton; the radicals X1 independently of one another are C1-C20alkyl unsubstituted or substituted by one or more hydroxy, amino and/or nitro groups; C2-C20alkenyl unsubstituted or substituted by one or more hydroxy, amino and/or nitro groups; C2-C20alkyl interrupted by oxygen or sulfur; C3-C12cycloalkyl unsubstituted or substituted by one or more C1-C20alkyl; (C3-C12cycloalkyl)-C1-C10alkyl unsubstituted or substituted by one or more C1-C20alkyl; bis[C3-C12cycloalkyl]-C1-C10alkyl unsubstituted or substituted by one or more C1-C20alkyl; a bicyclic or tricyclic hydrocarbon radical with 5 to 20 carbon atoms unsubstituted or substituted by one or more C1-C20alkyl; phenyl unsubstituted or substituted by one or more radicals selected from C1-C20alkyl, C1-C20alkoxy, C1-C20alkylamino, di(C1-C20alkyl)amino, amino, hydroxy and nitro; phenyl-C1-C20alkyl unsubstituted or substituted by one or more radicals selected from C1-C20alkyl, C3-C12cycloalkyl, phenyl, C1-C20alkoxy, amino, hydroxy and nitro; phenylethenyl unsubstituted or substituted by one or more C1-C20alkyl; biphenyl-(C1-C10alkyl) unsubstituted or substituted by one or more C1-C20alkyl; naphthyl unsubstituted or substituted by one or more C1-C20alkyl; naphthyl-C1-C20alkyl unsubstituted or substituted by one or more C1-C20alkyl; naphthoxymethyl unsubstituted or substituted by one or more C1-C20alkyl; biphenylenyl, fluorenyl or anthryl; a 5- to 6-membered heterocyclic radical unsubstituted or substituted by one or more C1-C20alkyl; a C1-C20hydrocarbon radical containing one or more halogen or pseudo-halogen; tri(C1-C10alkyl)silyl; or tri(C1-C10alkyl)silyl(C1-C10alkyl); Y0 is a residue which is formed by elimination of y amino groups of a saturated or unsaturated aliphatic polyamine having 3 to 25 carbon atoms, a residue which is formed by elimination of y amino groups of a saturated or unsaturated alicyclic polyamine having 6 to 25 carbon atoms or a residue which is formed by elimination of y amino groups of an aromatic polyamine having 6 to 25 carbon atoms; any of said polyamines optionally contains further hetero atoms in its skeleton; the radicals Y1 independently of one another have one of the definitions of X1; Z0 is a residue which is formed by elimination of z′ amino groups and z″ carboxyl groups of an unsaturated or saturated aliphatic amino carboxylic acid having 2 to 25 carbon atoms, a residue which is formed by elimination of z′ amino groups and z″ carboxyl groups of a saturated or unsaturated alicyclic amino carboxylic acid having 7 to 25 carbon atoms or a residue which is formed by elimination of z′ amino groups and z″ carboxyl groups of an aromatic amino carboxylic acid having 7 to 25 carbon atoms; any of said amino carboxylic acids optionally contains further hetero atoms in its skeleton; and the radicals Z1 and Z2 independently of one another have one of the definitions given for X1. |
