Thermoplastic olefin compositions
A technology of monomer composition and polymer, applied in the field of thermoplastic olefin composition, can solve the problems of lack of processability, low molecular weight, low toughness, etc.
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[0070] Process for the preparation of polymer blends
[0071] The in-reactor polymer blends described herein can be prepared by initially contacting propylene alone in a first reaction zone with a polymerization catalyst capable of producing crystalline polypropylene having a crystallinity of 20% or greater. Then at least a portion of the contents of the first reaction zone together with one or more of ethylene or C 4 -C 12 The monomers of alpha-olefins and mixtures thereof and optionally together with additional propylene are transferred to a separate second reaction zone so that amorphous or semi-crystalline propylene copolymers are produced in the presence of the produced polypropylene.
[0072] In one embodiment, the second reaction zone utilizes the same catalyst system transferred from the first reaction zone, with no additional catalyst supplied to the second reaction zone. Alternatively, an additional amount of the same catalyst system as used in the first reaction z...
Embodiment 1-3
[0202] These examples illustrate the use of a series of reactors operated in a continuous stirred tank solution process using rac-dimethyldimethylsilylbis(2-methyl-4-phenylindenyl) The zirconium catalyst (catalyst A) produced polypropylene in the first reactor and propylene / ethylene copolymer in the second reactor. The first reactor was 0.5 liter and the second reactor was 1 liter; both were stainless steel autoclave reactors and fitted with stirrer, water cooling / steam heating elements with temperature controls, and pressure controls. Solvents, monomers such as ethylene and propylene are first purified by passing through a 3-column purification system. The purification column was regenerated periodically whenever there was evidence of reduced polymerization activity.
[0203] Solvent feed to the reactor was measured by mass flow meter. The Pulsa feed pump controls solvent flow and increases solvent pressure to the reactor. The compressed, liquefied propylene feed was measu...
Embodiment 4-7
[0216] Embodiment 4-7 (comparison)
[0217] A series of physical blends of polypropylene and propylene / ethylene copolymers were prepared. The polymers of the physical blends were selected to closely replicate the components of the in-reactor blends of Examples 1-3. The weight ratios of the components in the physical blend are similar to those of the polymer blend produced in the reactor. Two homopolypropylene samples and two propylene / ethylene copolymer samples were prepared using similar polymerization procedures as described in Examples 1-3, except that a single catalyst system was used in a single polymerization reactor. Polymerization was performed with the same catalyst system at the same reaction temperature and similar monomer concentration to ensure that the physical blend had the same component properties as the in-reactor blend. The properties of these polymers are listed in Table 2.
[0218]
[0219] Comparative physical blends were prepared by blending prefor...
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