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Elastic blends comprising crystalline polymer and crystallizable polymers of propylene

a technology of crystallization polymer and polymer, which is applied in the field of elastic blends comprising crystalline polymer and crystallization polymer of propylene, can solve the problems of only achieving good compatibility, and achieve the effects of improving compatibility, good compatibility, and improving adhesion

Inactive Publication Date: 2005-02-24
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The SPC and the SPC2, if used, have stereoregular propylene sequences long enough to crystallize. The SPC has a melting point of less than 105° C. or preferably less than 100° C. and preferably has a heat of fusion of less than 75 J / g. The SPC2 has a melting point of less than 115° C. or preferably less than 100° C. and preferably has a heat of fusion of less than 75 J / g. These stereoregular propylene sequences of SPC and SPC2 should substantially match the stereoregularity of the propylene in the first polymer. For example, if the FPC is predominately isotactic polypropylene, then the SPC, and SPC2 if used, is copolymer having isotactic propylene sequences. If the FPC is predominately syndiotactic polypropylene, then the SPEC and the SPC2 if used, is a copolymer having syndiotactic sequences. Therefore, SPC and SPC2 have similar, preferably substantially identical, tacticity to the FPC. It is believed that this matching of stereoregularity increases the compatibility of the components and results in improved adhesion at the interface of the domains of the polymers of different crystallinities in the polymer blend composition. Furthermore, good compatibility is only achieved in a narrow range of copolymer composition for the SPC. Narrow intermolecular and intramolecular compositional distribution in the copolymer is preferred. The aforementioned characteristics of the SPC, and SPC2 if used, are preferably achieved by polymerization with a chiral metallocene catalyst.
One preferable embodiment is blending isotactic polypropylene (FPC) with ethylene propylene copolymers (SPC) having about 4 wt. % to about 35 wt. % ethylene (to ensure high compatibility with the FPC). Both the FPC and the SPC have isotactic propylene sequences long enough to crystallize. Resulting blends of isotactic polypropylene with ethylene propylene copolymers according to the invention have improved properties as compared to isotactic polypropylene blends with prior art ethylene propylene rubbers.
The SPC2, if used, has the same characteristics as the SPC described above. The SPC2 has a crystallinity and composition intermediate between the FPC and the SPC. In the preferred case where the SPC2 is a copolymer of ethylene and propylene while the FPC is homopolymer of propylene. The SPC2 has the same type of crystallinity of propylene as in the FPC and SPC and an ethylene content in between FPC and SPC. The addition of SPC2 to the blend leads to a better dispersion of the phases in the blend compared to blends of the similar composition which do not have any SPC2. The relative amounts of SPC and SPC2 can vary between 95:5 to 10:90 in the blend. The ratio of the FPC to the sum of SPC and SPC2 may vary in the range of 1:99 to 95:5 by weight and more preferably in the range 2:98 to 70:30 by weight

Problems solved by technology

Furthermore, good compatibility is only achieved in a narrow range of copolymer composition for the SPC.

Method used

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  • Elastic blends comprising crystalline polymer and crystallizable polymers of propylene
  • Elastic blends comprising crystalline polymer and crystallizable polymers of propylene
  • Elastic blends comprising crystalline polymer and crystallizable polymers of propylene

Examples

Experimental program
Comparison scheme
Effect test

example 1

Ethylene / Propylene Copolymerization to Form the Second Polymer Component

Continuous Polymerization of the SPC was conducted in a 9 liter Continuous Flow Stirred Tank Reactor using hexane as the solvent. The liquid full reactor had a residence time of 9 minutes and the pressure was maintained at 700 kpa. A mixed feed of Hexane, ethylene and propylene was pre-chilled to approximately −30° C. to remove the heat of polymerization, before entering the reactor. Solution of catalyst / activator in Toluene and the scavenger in hexane were separately and continuously admitted into the reactor to initiate the polymerization. The reactor temperature was maintained between 35 and 50 C, depending on the target molecular weight. The feed temperature was varied, depending on the polymerization rate to maintain a constant reactor temperature. The polymerization rate was varied from about 0.5 Kg / hr to about 4 Kg / hr.

Hexane at 30 Kg / hr was mixed with ethylene at 717 g / hr and propylene at 5.14 Kg / hr a...

example 2

Comparative Ethylene / Propylene Polymerization where the Propylene Residues are Atactic

Polymerizations were conducted in a 1 liter thermostated continuous feed stirred tank reactor using hexane as the solvent. The polymerization reactor was full of liquid. The residence time in the reactor was typically 7-9 minutes and the pressure was maintained at 400 kpa. Hexane, ethene and propene were metered into a single stream and cooled before introduction into the bottom of the reactor. Solutions of all reactants and polymerization catalysts were introduced continuously into the reactor to initiate the exothennic polymerization. Temperature of the reactor was maintained at 45° C. by changing the temperature of the hexane feed and by using cooling water in the external reactor jacket. For a typical polymerization, the temperature of feed was about −10° C. Ethene was introduced at the rate of 45 gms / min and propene was introduced at the rate of 310 gms / min. The polymerization catalyst, dime...

example 3

Analysis and Solubility of Several Second Polymer Components

In the manner described in Example 1 above, several second polymer components of the above specification were synthesized. These are described in the table below. Table 1 describes the results of the GPC, composition, ML and DSC analysis for the polymers.

TABLE 1Table 1: Analysis of the second polymer componentand the comparative polymersEthyleneHeat of(Mn) by(Mw) bywt. %fusionMelting PointMLSPCGPCGPCby IRJ / gby DSC (° C.)(1 + 4)@125° C.SPC-11020002489007.371.984.714SPC-29.430.265.227.8SPC-312470026590011.617.143.023.9SPC-412.816.442.5SPC-514.713.247.838.4SPC-612190031890016.4 7.840.333.1SPC-717.8 5.339.5ComparativePolymersEPR47.8notnot40detecteddetectedAePP11.7notnot23detecteddetected

Table 2 describes the solubility of the second polymer component

TABLE 2Table 2: Solubility of fractions of the second polymer component.Sum of the fractions add up to slightly more than 100due to imperfect drying of the polymer fractions....

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Abstract

Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable alpha-olefin sequences. In a preferred embodiment, improved thermoplastic polymer blends are provided comprising from about 35% to about 85% isotactic polypropylene and from about 30% to about 70% of an ethylene and propylene copolymer, wherein said copolymer comprises isotactically crystallizable propylene sequences and is predominately propylene. The resultant blends manifest unexpected compatibility characteristics, increased tensile strength, and improved process characteristics, e.g., a single melting point.

Description

FIELD OF THE INVENTION The invention relates to a blend of at least two thermoplastic components differing in their crystallinities. The blend has a heterogeneous morphology with distinct phase separated zones of different composition and crystallinity present. The resulting blend with the defined morphology shows dramatic improvements in mechanical deformation recoverability when compared to its individual unblended components. The invention also relates to improvements in the flexibility of the blend. Changes in the relative amounts or the crystallinities of the blend components or the morphology of the blend affect the recoverability and the flexibility of the blend. The inventive blends designed for recoverability contains a dispersed phase of a greater crystallinity and a continuous phase of lesser crystallinity. The sizes of the individual domains of the dispersed phase are very small with the smallest length dimension for the dispersed phase being less than 5 μm. This phase...

Claims

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Application Information

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IPC IPC(8): C08L23/10C08L23/12C08L23/14C08L23/16
CPCC08L23/10C08L23/12C08L23/142C08L2205/02C08L2666/04C08L2666/06C08J2300/22
Inventor DATTA, SUDHINCOZEWITH, CHARLESRAVISHANKAR, PERIAGARAMSTACHOWSKI, EDMUND J.
Owner EXXONMOBIL CHEM PAT INC
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