Novel catalysts and methods of use thereof to produce vinyl terminated polymers
A vinyl-terminated, propylene polymer technology, applied in the field of olefin polymerization of polymers, which can solve problems such as low catalyst productivity
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Embodiment 1 and 2
[0401] A 2 L stirred autoclave reactor was used for batch or continuous polymerization of propylene polymers.
[0402] Scavengers and Cocatalysts
[0403] Triisobutylaluminum (TIBAL) was obtained from Akzo Chemicals, Inc. (Chicago, IL) and used without further purification. Tri-n-octylaluminum (TNOAL) was obtained from Akzo Chemicals, Inc. and used without further purification.
[0404] Catalyst solutions were prepared by: Vacuum Atmospheres purged with dry nitrogen TM In a dry box, metallocene and activator were added in approximately equimolar (typically 1.00:1.05) amounts to 4 mL of dry toluene in a 10 mL glass vial. The mixture was stirred for several minutes and then transferred to a clean, oven-dried catalyst tube. An example of the basic polymerization procedure is as follows: 2 mL of 25 wt% TNOAL (0.037 g Al) in hexane as scavenger and 100 mL of propylene were added to the reactor. The reactor was then heated to the selected polymerization temperature and catalyst / ...
Embodiment 1
[0405] Example 1: Comparative Propylene Polymerization Results
[0406] In a 2-liter batch reactor, activator III (1.6x10 -6 M) Screen metallocenes E and F (at a concentration of 1.6x10 -6 M). Use TIBAL (2.5x10 -4 M) as a scavenger. The temperature of the reactor was varied during polymerization experiments 1-12, as shown in Table 1A below.
[0407]
[0408] pass 1 The polymer products of Experiments 1-12 were characterized by H NMR and GPC, and the characterization results are reported in Table 1B below:
[0409]
[0410] Notes: *Trisubstituted = trisubstituted unsaturated chain ends; **VYD = vinylidene.
Embodiment 2
[0412] Example 2: Propylene Polymerization Using Metallocene E
[0413] Continuous solution polymerization was carried out using metallocene E as catalyst and activator III as activator. Pre-mix metallocene E with activator III at a ratio of 1:1 and add 3.3x10 -7 The rate of mol / min was fed into the reactor. Propylene (C 3 ) was fed into the reactor at a rate of 15 g / min, isohexane was fed into the reactor at a feed rate of 59.4 g / min, and TNOAL was fed into the reactor at a rate of 5.2×10 -6 A feed rate of mol / min was fed into the reactor.
[0414] The temperature of the reactor was varied between the polymerization experiments as shown in Table 2A below.
[0415]
[0416] pass 1 H NMR and GPC characterize the polymer products of Experiments 13-18. The characterization results are reported in Table 2B below:
[0417]
[0418] Notes: *Trisubstituted = trisubstituted unsaturated chain ends; **VYD = vinylidene.
[0419] figure 1 Represents the trends observed in M...
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