Mono- and multi-layer blown films

Patent metadata

Field	Value
Publication number	US-9732198-B2
Application number	US-201615370030-A
Country	US
Kind code	B2
Filing date	Dec 6, 2016
Priority date	May 16, 2006
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

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 optionally d) a Modulus according to EN ISO 527 enhanced by at least 10% versus a reference film without the nucleating agent.

First claim

The invention claimed is:

1. 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 nucleating agent of formula (IA), (IB) or (IC),

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;
X 0 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 X 1 independently of one another are
C 1 -C 20 alkyl unsubstituted or substituted by one or more hydroxy, amino and/or nitro groups;
C 2 -C 20 alkenyl unsubstituted or substituted by one or more hydroxy, amino and/or nitro groups;
C 2 -C 20 alkyl interrupted by oxygen or sulfur;
C 3 -C 12 cycloalkyl unsubstituted or substituted by one or more C 1 -C 20 alkyl;
(C 3 -C 12 cycloalkyl)-C 1 -C 10 alkyl unsubstituted or substituted by one or more C 1 -C 20 alkyl;
bis[C 3 -C 12 cycloalkyl]-C 1 -C 10 alkyl unsubstituted or substituted by one or more C 1 -C 20 alkyl;
a bicyclic or tricyclic hydrocarbon radical with 5 to 20 carbon atoms unsubstituted or substituted by one or more C 1 -C 20 alkyl;
phenyl unsubstituted or substituted by one or more radicals selected from C 1 -C 20 alkyl, C 1 -C 20 alkoxy, C 1 -C 20 alkylamino, di(C 1 -C 20 alkyl)amino, amino, hydroxy and nitro;
phenyl-C 1 -C 20 alkyl unsubstituted or substituted by one or more radicals selected from C 1 -C 20 alkyl, C 3 -C 12 cycloalkyl, phenyl, C 1 -C 20 alkoxy, amino, hydroxy and nitro;
phenylethenyl unsubstituted or substituted by one or more C 1 -C 20 alkyl;
biphenyl-(C 1 -C 10 alkyl) unsubstituted or substituted by one or more C 1 -C 20 alkyl;
naphthyl unsubstituted or substituted by one or more C 1 -C 20 alkyl;
naphthyl-C 1 -C 20 alkyl unsubstituted or substituted by one or more C 1 -C 20 alkyl;
naphthoxymethyl unsubstituted or substituted by one or more C 1 -C 20 alkyl;
biphenylenyl, fluorenyl, anthryl;
a 5- to 6-membered heterocyclic radical unsubstituted or substituted by one or more C 1 -C 20 alkyl;
a C 1 -C 20 hydrocarbon radical containing one or more halogen or pseudo-halogen;
tri(C 1 -C 10 alkyl)silyl; or
tri(C 1 -C 10 alkyl)silyl(C 1 -C 10 alkyl);
Y 0 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 Y 1 independently of one another have one of the definitions of X 1 ;
Z 0 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 Z 1 and Z 2 independently of one another have one of the definitions given for X 1 .

2. The extruded air cooled blown film according to claim 1 , having
d) a Modulus according to EN ISO 527 enhanced by at least 10% versus a reference film without a nucleating agent of the formula (IA), (IB), or (IC).

3. The extruded air cooled blown film according to claim 1 , comprising 20 to 100% by weight, relative to its total weight, of a polypropylene homopolymer or copolymer.

4. The extruded air cooled blown film according to claim 1 , wherein
layer L contains a polypropylene homopolymer, random copolymer, alternating or segmented copolymer, a block copolymer or a blend of polypropylene with another synthetic polymer.

5. The extruded air cooled blown film according to claim 1 , wherein
the layer L contains a propylene copolymer with ethylene at an ethylene content of 0.5 to 15% by weight, relative to the total weight of the propylene copolymer.

6. The extruded air cooled blown film according to claim 1 , wherein
the polypropylene homopolymer or copolymer has a melt flow rate of 0.3 to 5 dg/min at 230° C. and 2.16 kg according to ASTM D1238.

7. The extruded air cooled blown film according to claim 1 , wherein the film structure contains at least one coextruded layer of low-, linear-low- or high-density polyethylene (LDPE, LLDPE, HDPE) or metallocene polyethylene, adjacent to the layer of polypropylene.

8. The extruded air cooled blown film according to claim 1 , consisting of 3 coextruded layers, the layer L is the inner layer and two layers S1 and S2 are the outer layers, the layers 51 and S2 contain at least 50% of low-, linear-low- or high-density polyethylene (LDPE, LLDPE, HDPE) or metallocene polyethylene (m-PE) or any mixture thereof.

9. The extruded air cooled blown film according to claim 1 , wherein one or more layers contain ethylene vinyl alcohol copolymer (EVOH), ethylene vinyl acetate copolymer (EVA), maleic anhydride grafted polypropylene or polyethylene, copolymers of acrylic-acid esters with propylene or ethylene, acrylic acid copolymers with propylene or ethylene, polyvinylidene chloride (PVDC), polyamide, or polyester.

10. The extruded air cooled blown film according to claim 1 , which contains additionally one or more adhesive layer.

11. The extruded air cooled blown film according to claim 1 , having a Modulus according to EN ISO 527 enhanced in longitudinal direction by at least 10% versus a reference film without a nucleating agent of the formula (IA), (IB), or (IC).

12. The extruded air cooled blown film according to claim 1 , having a Modulus according to EN ISO 527 enhanced in transversal direction by at least 10% versus a reference film without a nucleating agent of the formula (IA), (IB), or (IC).

13. The extruded air cooled blown film according to claim 1 , having
a Haze value according to ASTM D-1003 reduced by at least 10% relative to a reference film without a nucleating agent of the formula (IA), (IB), or (IC).

Assignees

• Basf Se

Inventors

• Stoll Klaus
• Hornbach Karl-Heinz

Classifications

• B29K2995/0026

  Transparent · CPC title

• B29C48/10

  flexible, e.g. blown foils · CPC title

• B29K2023/12

  PP, i.e. polypropylene · CPC title

• B32B27/08 Primary

  of synthetic resin · CPC title

• B29C55/005

  characterised by the choice of materials · CPC title