film
A film and blown film technology, applied in the field of multi-layer blown polyolefin film, can solve the problems of poor sealing effect and high atomization degree
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[0086] The preparation of metallocenes can be carried out according to or using similar literature methods known to those skilled in the art. So for preparation see eg EP-A-129368, metal atom attached to a -NR" 2 Compound examples of ligands are described in WO-A-9856831 and WO-A-0034341. For preparation see also eg EP-A-260130, WO-A-9728170, WO-A-9846616, WO-A-9849208, WO-A-9912981, WO-A-9919335, WO-A-9856831, WO-A-9856831, WO-A- A-00 / 34341, EP-A-423101 and EP-A-537130.
[0087] Optionally, in a further subgroup of the metallocene compound, the metal as described above linking a Cp group and additional eta1 or eta2 ligands, wherein the ligands may be mutually bridged or non-bridged. Said compounds are described in eg WO-A-9613529, the contents of which are incorporated by reference in the present invention.
[0088] Further preferred metallocenes include formula (I)
[0089] Cp' 2 HfX' 2
[0090] wherein each X' is halogen, C1-6 alkyl, benzyl or hydrogen;
[0091] Cp'...
example 1
[0169] Films were prepared according to the following parameters:
[0170] Multilayer blown films were produced on a three-layer coextrusion line with a 50 mm diameter barrel and a 200 mm diameter tubular die x 1.5 mm die gap. The melting temperature of the process polypropylene was 225°C and that of the polyethylene line process was 205°C; the external cooling air was maintained at 18°C and no internal cooling was used.
[0171] A film with a thickness of 40 μm is adjusted by the extruder output ratio (60kg / h), blow-up ratio (2, 5:1) and take-off speed (20m / min).
[0172] Comparative film 1: Symmetrical 3-layer film with a thickness of 40 μm:
[0173] Structure A / B / A (20 / 60 / 20%)
[0174] Layer A: 90%Exceed1018EB+10%FT5230
[0175] Layer B: 80%BC918CF+20%RB707CF
[0176] Film 1 of the present invention - an asymmetric 3-layer film with a thickness of 40 μm:
[0177] Structure A / A / B (33 / 34 / 33%)
[0178] Layer A: 100% RB707CF
[0179] Layer B: 100%ExceedFPs317-C
[018...
example 2
[0184] According to the parameters of Example 1, the following additional films were prepared. All films prepared had a thickness of 40 μm and a width of 20 cm.
[0185] Table 1
[0186] film
A
B
C
layer distribution
actual width
overall width
2
RB707CF
RB707CF
FPs317-C
33 / 34 / 33%
19.7
20.5
3
RC707MO
RB707CF
FPs317-C
33 / 34 / 33%
16
20
C4
BC918CF
RB707CF
FPs317-C
33 / 34 / 33%
1.5
20.5
C5
RB707CF
RB707CF
FPs117-C
33 / 34 / 33%
3.5
20.5
C6
RB707CF
RB707CF
FPs117-C
15 / 70 / 15%
20.1
20.5
[0187] The total width of each film should be about 20.5 cm. If a film curls, the reduction in measured width depends on the severity of the curl. It is thus clearly seen that comparative films 4 and 5 are so curled that they form a cylindrical shape. This cylinder has a diameter of 1.5 or 3.5 cm. The film 5 adop...
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Abstract
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