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Impact-modified polypropylene

A polypropylene, propylene technology, applied in the field of polymer compositions with high impact strength, can solve problems affecting low temperature applications, etc.

Inactive Publication Date: 2010-09-22
ボレアリステクノロジーオイ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since polypropylene has a glass transition temperature at about 0°C, polypropylene is brittle at low temperatures, which affects its low-temperature applications

Method used

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  • Impact-modified polypropylene
  • Impact-modified polypropylene

Examples

Experimental program
Comparison scheme
Effect test

test approach I

[0143] Based on the standard test method ISO 16014-2: 2003 and ISO 6014-4: 2003, the weight average molecular weight (Mw) and the number average molecular weight (Mn) are measured by molecular exclusion chromatography (SEC) and the molecular weight distribution (MWD= Mw / Mn).

[0144] Under 140 degrees centigrade, adopt online viscometer in Waters Alliance GPCV2000SEC instrument (eluent is 1,2,4-trichlorobenzene ( TCB)) to measure molecular weight average and molecular weight distribution. A combination of 2 mixture beds and a TSK-Gel column (from TosoHaas), the system was calibrated with NMWD polystyrene standards (from Polymer laboratories).

[0145] 2. Melt flow rate (MFR)

[0146] At 230°C for polypropylene and at 190°C for polyethylene, the load is 2.16kg (MFR 2 ), to measure the melt flow rate. The melt flow rate refers to the amount (in grams) of polymer extruded within 10 minutes by a test device conforming to the ISO 1133 standard at a temperature of 230°C or 190...

Embodiment 1(Ex1) and comparative Embodiment 1-3

[0168] Embodiment 1 (Ex1) and comparative examples 1-3 (CE1-3)

[0169] In all these examples the propylene homopolymer (MFR 2 (230° C.)=10 g / 10 min, Mw=330,000 g / mol and MWD=5,2) as matrix polymer.

[0170] In CE1, only a single non-crosslinked elastomeric phase consisting of ethylene / 1-octene copolymer (EOC) is dispersed in the matrix polymer. EOC has 42% by weight of C 8 unit, with a density of 0.863 g / cm 3 , MFR 2 (190°C) = 0,5 g / 10 min.

[0171] In CE2, only a single crosslinked elastomeric phase consisting of crosslinked polybutadiene rubber (named microgel 2, with an average particle size of 400 nm) was dispersed in the matrix polymer.

[0172] In CE3, the elastomeric EOC phase used in CE1 and the crosslinked polyisoprene rubber (designated Microgel 1, with an average particle size of 400 nm) were dispersed in the matrix polymer.

[0173] In Ex1, the elastomeric EOC phase used in CE1 and the cross-linked polybutadiene rubber (named microgel 2) were dispersed in th...

Embodiment 2 and comparative Embodiment 4-6

[0197] In all examples, high impact polypropylene was used. Impact PP is a reactor blend of propylene homopolymer and ethylene / propylene rubber dispersed in it. Dispersed EPR represents the first elastomeric phase. The impact polypropylene is produced in a multi-stage polymerization process consisting of 1 loop reactor and 1 gas phase reactor using conventional Ziegler Natta catalyst systems known in the art. In the loop reactor, a propylene homopolymer having an MFR of 25 g / 10 min was produced. The polymer is transferred to a gas phase reactor for the production of EPR. The final composition had an MFR of 7,5 g / 10 min, an XS value of 25% by weight and an intrinsic viscosity of the xylene soluble fraction of 2,8 dl / g. The ethylene content of the xylene soluble fraction was 43.0% by weight.

[0198] In CE4, there is no additional elastomeric phase dispersed in the matrix.

[0199] In CE5, a non-crosslinked elastomeric phase consisting of ethylene / 1-octene copolymer (EOC) i...

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Abstract

The present invention relates to a polymer composition, comprising: (i) a polypropylene matrix; (ii) a first elastomeric phase dispersed within the matrix and having a glass transition temperature Tg1, measured with dynamical mechanical thermal analysis according to ISO 6721-2, wherein the first elastomeric phase comprises an ethylene copolymer having comonomer units derived from C3 to C8 olefins; (iii) a second elastomeric phase dispersed within the matrix, wherein the second elastomeric phase is crosslinked and has a glass transition temperature Tg2, measured with dynamical mechanical thermal analysis according to ISO 6721-2, within the range of - 70 DEG C to -90 DEG C, wherein the difference between Tg1 and Tg2 is at least 15 DEG C and Tg1 is higher than Tg2.

Description

technical field [0001] The present invention relates to polymer compositions having high impact strength, especially at low temperatures, and to processes for preparing said compositions. Background technique [0002] The economic success of polypropylene is based on its processability and broad applicability. Applications of polypropylene can be found in many fields such as packaging, automotive and electronics industries. [0003] However, since polypropylene has a glass transition temperature at about 0°C, polypropylene is brittle at low temperatures, thereby affecting its low-temperature applications. In order to improve the impact resistance of polypropylene, it is known to contain an elastomeric phase, such as one prepared from ethylene-propylene rubber (EPR) or ethylene-propylene-diene copolymer (EPDM). [0004] GB-A 1,156,813 discloses a polypropylene blend comprising 65-96% by weight of polypropylene (comonomer content less than 10% by weight), 2-20% by weight of ...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L23/12C08L23/14C08L9/00C08L23/10
CPCC08L23/0807C08L23/12C08L23/142C08L9/00C08L23/0815C08L23/10C08L2666/08C08L2666/06
Inventor 克劳斯·伯恩雷特纳唐·法姆甄斯·罗伊斯納
Owner ボレアリステクノロジーオイ
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