Broad molecular weight distribution polypropylene resins

A technology of polypropylene resin and resin, which is applied in the field of polypropylene resin and products made from it, and can solve problems such as poor melt strength and unsuitable conversion process

Active Publication Date: 2015-07-08
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Resins with a molecular weight distribution range of 3-4.5 are not suitable for conversion processes due to poor melt strength, such as blown film applications in monolayer or multilayer applications

Method used

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  • Broad molecular weight distribution polypropylene resins
  • Broad molecular weight distribution polypropylene resins
  • Broad molecular weight distribution polypropylene resins

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0097] The external electron donors used in the preparation of the electron donor catalyst component may be those electron donors used in the preparation of the solid titanium catalyst component. In either embodiment, each external electron donor (A) and (B) comprises an organosilicon compound.

[0098] In either embodiment, the one or more external electron donors may include organosilicon compounds of the formula:

[0099] R 3 n Si(OR 4 ) 4-n

[0100] where R 3 and R 4 independently represent hydrocarbon groups and 0<n<4.

[0101] Examples of suitable organosilicon compounds include trimethylmethoxysilane, trimethylethoxysilane, dimethyldimethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane , Diisopropyldiethoxysilane, tert-butylmethyl-n-diethoxysilane, tert-butylmethyldiethoxysilane, tert-amylmethyldiethoxysilane, diphenyldimethoxysilane , phenylmethyldimethoxysilane, diphenyldiethoxysilane, bis-o-tolyldimethoxysilane, bis-m-tolyldimethoxysilane, bis-p-to...

Embodiment approach

[0176] E1. Polypropylene resin, which comprises:

[0177] at least 50 mol% propylene;

[0178] MWD(Mw / Mn) is greater than 5;

[0179] a branching index (g') of at least 0.95; and

[0180] Using an extensional rheometer, the melt strength measured at 190°C is greater than 20 cN.

[0181] E2. The resin of embodiment El wherein the MWD is 6-15.

[0182] E3. The resin of any one of the preceding embodiments, wherein the melt strength is from 50 cN to 200 cN.

[0183] E4. The resin of any one of the preceding embodiments comprising a viscosity ratio of 35-80, as determined by the complex viscosity ratio at 190°C at an angular frequency of 0.01-100 rad / s, at a fixed strain of 10%.

[0184] E5. The resin of any one of the preceding embodiments, which has a heat distortion temperature of greater than or equal to 100°C, as measured in accordance with ASTM D648, using a load of 0.45 MPa (66 psi).

[0185] E6. The resin of any preceding embodiment, wherein the resin is an impact cop...

Embodiment

[0217] To measure physical properties, Table 1 and the following ASTM test methods described below were utilized.

[0218]

[0219] Melt Flow Rate (MFR): MFR is measured according to ASTM D1238, condition L, at 230°C and a load of 2.16 kg, using a melt index meter.

[0220] Flexural Modulus: Flexural modulus was measured using an Instron machine according to ASTM D790A using a crosshead speed of 1.27 mm / min (0.05 in / min) and a support span of 50.8 mm (2.0 in).

[0221]Tensile Strength: According to ASTM D638, using a crosshead speed of 50.8mm / min (2.0in / min), and a gauge length of 50.8mm (2.0in), using an Instron machine, measure the tensile strength at yield, yield elongation and elongation at break.

[0222] Notched Izod Impact Strength: The notched Izod impact strength was measured according to ASTM D256 at room temperature (21° C.) using equipment manufactured by Empire Technologies Inc.

[0223] Heat Distortion Temperature (HDT): HDT is measured according to ASTM D64...

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Abstract

Polypropylene resin comprising at least 50 mol% propylene, an MWD (Mw / Mn) of greater than 5, a branching index (g') of at least 0.95, and a melt strength of at least 20 cN determined using an extensional rheometer at 190°C. A catalyst system comprising a Ziegler-Natta catalyst comprising a non-aromatic internal electron donor, and first and second external electron donors comprising different organosilicon compounds, and a method to produce a polypropylene resin comprising contacting propylene monomers at propylene polymerization conditions with the catalyst system are also disclosed.

Description

technical field [0001] This application relates to polypropylene resins and articles made therefrom. Background technique [0002] The physical properties of propylene homopolymers formed by typical Ziegler-Natta polymerizations are highly dependent on the tacticity of the polymer itself. High tacticity polymers are generally crystalline, provide the desired high flexural modulus, and are formed using a suitably chosen electron donor. These highly crystalline polymers also exhibit high melting points but inherently exhibit low melt flow rates (MFR), making them generally unsuitable for applications requiring high processing rates such as injection molding, oriented films, and thermal bonding in the fiber. Further, conventional polypropylene homopolymer and copolymer products formed from highly crystalline polypropylene lack sufficient impact resistance for many applications. [0003] Polypropylene homopolymers or impact copolymers made from conventional Ziegler-Natta cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/06C08F210/06C08F255/02C08L23/10C08F4/00
CPCC08F10/06C08F110/06H01B1/20C08F2500/11C08F2500/12C08F2500/15C08F2500/17C08F2500/19C08F2500/04C08F4/6465C08F210/06C08K3/34C08K3/36C08L23/14C08L91/06
Inventor P·枚卡S·M·阿布巴卡S·Y·陈T·S·爱德华兹
Owner EXXONMOBIL CHEM PAT INC
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