Nucleated polypropylene composition

Patent metadata

Field	Value
Publication number	US-10125248-B2
Application number	US-201515316442-A
Country	US
Kind code	B2
Filing date	Jun 17, 2015
Priority date	Jun 27, 2014
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

Nucleated polypropylene composition comprising at least one propylene homopolymer wherein the nucleated polypropylene composition and/or the propylene homopolymer can be free of phthalic acid esters as well as their respective decomposition products.

First claim

The invention claimed is:

1. A nucleated polypropylene composition comprising:
a) at least one propylene homopolymer and
b) a polymeric nucleating agent
wherein the nucleated polypropylene composition and/or the propylene homopolymer is free of phthalic acid esters as well as their respective decomposition products and
wherein said nucleated polypropylene composition has a sum of [G′ (Storage Modulus; measured by Dynamic Mechanical Analysis according to ISO 6721-7)+Flexural Modulus (determined according to ISO178)], each expressed in MPa, of at least 2040 MPa.

2. The nucleated polypropylene composition according to claim 1 , comprising at least one propylene-copolymer-rubber phase, wherein the copolymer comprises ethylene and/oror a C 4 -C 10 alpha-olefin.

3. The nucleated polypropylene composition according to claim 1 , comprising:
a) the at least one propylene homopolymer and
b) a second propylene homopolymer,
wherein said nucleated polypropylene composition has a:
i) sum of [G′ (Storage Modulus, measured by Dynamic Mechanical Analysis according to ISO 6721-7)+Flexural Modulus (determined according to ISO178)] each expressed in MPa of at least 2970 MPa, and
ii) and a Notched Impact strength+23° C. according Charpy ISO 179/1eA of at least 1.8 kJ/m 2 .

4. The nucleated polypropylene composition according to claim 2 , wherein the nucleated polypropylene composition comprises at least one propylene-copolymer-rubber phase and optionally a second propylene-copolymer-rubber phase,
wherein said nucleated polypropylene composition has a:
i) sum of [G′ (Storage Modulus, measured by Dynamic Mechanical Analysis according to ISO 6721-7)+Flexural Modulus (determined according to ISO178)] each expressed in MPa of at least 2060 MPa, and
ii) and a Notched Impact strength+23° C. according Charpy ISO 179/1eA of at least 5 kJ/m 2 .

5. The nucleated polypropylene composition according to claim 1 , wherein the polymeric nucleating agent is compound according formula:
CH2=CH—CHR1R2,

wherein R1 and R2, together with the carbon atom they are attached to, form an optionally substituted saturated or unsaturated or aromatic ring or a fused ring system, wherein the ring or fused ring moiety contains four to 20 carbon atoms, or independently represent a linear or branched C4-C30 alkane, C4-C20 cycloalkane or C4-C20 aromatic ring.

6. The nucleated polypropylene composition according to claim 1 , wherein the composition has been polymerised in the presence of:
a) a Ziegler-Natta catalyst (ZN-C) comprising compounds (TC) of a transition metal of Group 4 to 6 of IUPAC, a Group 2 metal compound (MC) and an internal donor (ID), wherein said internal donor (ID) is a non-phthalic compound,
b) a co-catalyst (Co), and
c) optionally an external donor (ED).

7. The nucleated polypropylene composition according to claim 6 , wherein:
a) the internal donor (ID) is selected from optionally substituted malonates, maleates, succinates, glutarates, cyclohexene-1,2-dicarboxylates, benzoates and derivatives and/or mixtures thereof; and
b) the molar-ratio of co-catalyst (Co) to external donor (ED) [Co/ED] is 5 to 45.

8. The nucleated polypropylene composition according to claim 1 , wherein the composition is produced in a sequential polymerisation process comprising at least two reactors (R1) and (R2), in the first reactor (R1) a first propylene homopolymer fraction (H-PP1) is produced and subsequently transferred into the second reactor (R2), in the second reactor (R2) a second propylene homopolymer fraction (H-PP2) or a first propylene-ethylene rubber fraction (R-PP1) is produced in the presence of the first propylene homopolymer fraction (H-PP1).

9. The nucleated polypropylene composition according to claim 8 , wherein the process for producing the propylene composition comprises the step of preparing a propylene polymer using a polymerisation catalyst, obtained by polymerising a Ziegler-Natta polymerisation catalyst with a vinyl compound of the formula CH2=CH—CHR1R2, wherein R1 and R2, together with the carbon atom they are attached to, form an optionally substituted saturated or unsaturated or aromatic ring or a fused ring system, wherein the ring or fused ring moiety contains four to 20 carbon atoms, or independently represent H or a linear or branched C4-C30 alkane, C4-C20 cycloalkane or C4-C20 aromatic ring, whereby at least one of R1 and R2 is not H, at a weight ratio of the vinyl compound to polymerisation catalyst amounting to 3 or more, until the concentration of residual vinyl compound is less than about 0.5 wt %.

10. A moulded article comprising the nucleated polypropylene composition according to claim 1 .

Assignees

• Borealis Ag

Inventors

• Wang Jingbo
• Leskinen Pauli
• Vestberg Torvald
• Gahleitner Markus

Classifications

• C08L23/12 Primary

  Polypropene · CPC title

• C08L23/18

  Homopolymers or copolymers of hydrocarbons having four or more carbon atoms · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08L23/08

  Copolymers of ethene (C08L23/16 takes precedence) · CPC title