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Polypropylene composition

A polypropylene composition and propylene polymer technology, applied in the field of new polypropylene compositions, can solve the problems of not specifying hot tack and sealing starting temperature, not providing and the like

Active Publication Date: 2021-09-07
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] Values ​​for hot tack and seal initiation temperature (SIT) are not indicated, but based on the compositions shown in the examples, the SIT is expected to be too high (>130°C)
[0028] However, although much development work has been done in the field of films suitable for different kinds of packaging, the films disclosed in the prior art still do not provide low sealing An adequate balance of onset temperature (SIT) combined with high melting temperature, good processability and good optical properties such as low haze, such that there remains a need for new and improved film structures providing improved optical properties combined with improved Sealing properties (i.e. films with an improved balance between high melting temperature and low sealing initiation temperature (SIT), thus having a wide sealing window and thermal stability

Method used

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Examples

Experimental program
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Embodiment

[0261] Measurement methods

[0262] Unless otherwise defined, the following definitions of terms and assay methods apply to the above general description of the invention as well as to the following examples.

[0263] a) Melt flow rate

[0264] Melt flow rate (MFR) is determined according to ISO 1133 and is expressed in g / 10 min. MFR is an indicator of flowability and thus of the processability of a polymer. The higher the melt flow rate, the lower the viscosity of the polymer. MFR of polypropylene 2 It was measured at a temperature of 230° C. and under a load of 2.16 kg.

[0265] b) Melt flow rate (MFR) of propylene terpolymer (PPF2) 2 )

[0266] MFR of propylene terpolymer (PPF2) 2 Calculate using the following formula:

[0267] ln (MFR of polypropylene composition 2 )=x(ln(MFR of propylene terpolymer (PPF1) 2 ))+(1-x)(ln(MFR of propylene terpolymer (PPF2) 2 ));

[0268] The MFR of the polypropylene composition 2 refers to the MFR of the PP composition according...

Embodiment IE1

[0384] (b-1): Queo TM 8203, ethylene-octene copolymer, MFR (190 / 2.16) is 3g / 10min, density is 0.883g / cm 3 , melting point: 74°C, which was produced in a solution polymerization process using a metallocene catalyst.

Embodiment IE2

[0386] (b-2): Queo TM 0203, ethylene-octene copolymer, MFR (190 / 2.16) is 3g / 10min, density is 0.902g / cm 3 , melting point: 96°C, which was produced in a solution polymerization process using a metallocene catalyst.

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Abstract

New polypropylene composition, which combines low sealing initiation temperature (SIT), high melting temperature, good processability and good optical properties, like low haze, its use of and articles made therefrom.

Description

technical field [0001] The present invention relates to a novel polypropylene composition combining low seal initiation temperature (SIT), high melting temperature, good processability and good optical properties such as low haze. [0002] Furthermore, the present invention relates to the use of said polypropylene composition and articles prepared therefrom. Background technique [0003] Propylene homopolymers and copolymers are suitable for many applications such as packaging, textiles, automotive and plumbing. An important field of application for propylene polymers is the packaging industry, especially in film applications where sealing properties play an important role, such as heat sealing. [0004] Heat sealing is the primary method of manufacturing flexible and semi-rigid packaging. Important characteristics of good sealing performance are: [0005] a) low seal initiation temperature (SIT), which is required to support high speeds on packaging machines with low ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/06
CPCC08F210/06C08L2205/025C08L23/14C08F210/08C08F210/16C08F2500/05C08F2500/06C08F2500/12C08F2500/26C08F4/6465C08F2/001C08L23/0815C08L2201/10C08L2203/162C08L2314/02
Inventor 卢卡·博拉尼奥弗里德里希·伯杰埃琳娜·波马基纳
Owner BOREALIS AG