High density polyethylene
A high-density polyethylene, molecular weight polyethylene technology, applied in the types of packaging items, special packaging items, applications, etc., can solve the problems of difficult mixing, high cost, no shortcomings, etc.
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[0077] A preferred process for the preparation of polyethylene polymers is described in WO 00 / 71615, the contents of which are incorporated herein by reference.
[0078] Thus, in a particularly preferred embodiment, the HDPE polymer is obtained by in situ mixing in a multistage process.
[0079] The HDPE compositions previously described are particularly suitable for the production of monolayer or multilayer films, including cast films and extrusion blown films, wherein in the case of multilayer films extrusion includes coextrusion. The films of the present invention may comprise more than one layer and / or have any thickness.
[0080] The film comprises the HDPE composition of the invention and may of course also contain other polymer components. Other polymers may be present in any layer of the film comprising the claimed HDPE. Typical polymers that may occur include LDPE, LLDPE, ethylene propylene rubber and other HDPE polymers. When such polymers are mixed with HDPE to f...
Embodiment 1
[0128] Example 1 - Synthesis of multimodal HDPE polymer
[0129] The direction volume is 500dm 3 Propane, ethylene and hydrogen are continuously fed into the loop reactor. In addition, the polymerization catalyst prepared according to Example 3 in EP 688794 B (the average particle diameter of the silica carrier is 20 μm) is added in the reactor together with triethylaluminum, so that the molar ratio of aluminum in the activator and titanium in the solid component is 15. The loop reactor was operated at a temperature of 95°C and a pressure of 60 bar. The ratio of hydrogen to ethylene was 372 mol / kmol. The productivity of the polymer was about 27 kg / h. The polymer produced in the loop reactor had an MFR of 410 g / 10 min 2 and about 970kg / m 3 Density.
[0130] The slurry was continuously withdrawn from the loop reactor and introduced into a flash tank with a reduced pressure of 3 bar through a discharge valve. The HMW component is produced in the presence of the LMW compon...
Embodiment 2
[0132] The direction volume is 500dm 3 Propane, ethylene and hydrogen are continuously fed into the loop reactor. In addition, the polymerization catalyst prepared according to Example 3 in EP 688794B (the average particle size of the silica carrier is 20 μm) is added to the reactor together with triethylaluminum, so that the molar ratio of aluminum in the activator to titanium in the solid component is 15 . The loop reactor was operated at a temperature of 95°C and a pressure of 57.9 bar. The ratio of hydrogen to ethylene is 202 mol / kmol. The productivity of the polymer was about 37.1 kg / h. The polymer produced in the loop reactor has about 970 kg / m 3 Density.
[0133] The slurry was continuously withdrawn from the loop reactor and introduced into a flash tank with a reduced pressure of 3 bar through a discharge valve. The HMW component is produced in the presence of the LMW component by introducing the polymer containing traces of residual hydrocarbons into a fluidized...
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Abstract
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