Multicomponent polypropylene compositions for use in injection moulded articles

Patent metadata

Field	Value
Publication number	US-9328233-B2
Application number	US-201113699022-A
Country	US
Kind code	B2
Filing date	May 19, 2011
Priority date	May 21, 2010
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

A composition comprising: (I) 60 to 92.5 wt % of a first component which is a polypropylene polymer comprising a) 40 to 85 wt % of a propylene polymer A having a melt flow rate (MFR 2 ) between 0.01 and 300 g/10 min, and b) 15 wt % or more of at least one propylene ethylene copolymer; and (II) 2.5 to 30 wt % of a second component comprising at least one ethylene alkyl (meth)acrylate polymer; and optionally (III) 5 to 25 wt % of at least one filler.

First claim

The invention claimed is:

1. A composition comprising:
(I) 60 to 92.5 wt % of a first component which is a polypropylene polymer comprising
a) 40 to 85 wt % of a propylene homopolymer A having a melt flow rate (MFR 2 ) between 0.01 and 300 g/10 min, and
b) 15 wt % or more of at least one propylene ethylene copolymer; and

(II) 2.5 to 30 wt % of a second component comprising at least one ethylene C 1 -C 4 -alkyl (meth)acrylate polymer; and
(III) 5 to 25 wt % of at least one filler,
wherein the difference between radial and tangential shrinkage of the composition is less than 0.1 percentage points.

2. A composition as claimed in claim 1 wherein polymer (II) is an ethylene C 1 -C 4 -alkyl acrylate polymer.

3. A composition as claimed in claim 1 wherein polymer (II) is ethylene methyl acrylate.

4. A composition as claimed in claim 1 wherein the amount of polymer (II) is in the range of 7.5 to 15 wt %.

5. A composition as claimed in claim 1 wherein polymer (I) is a heterophasic polypropylene polymer.

6. A composition as claimed in claim 1 comprising:
(I) 65 to 92.5 wt % of a first component which is a polypropylene polymer comprising
a) 40 to 85 wt % of a propylene homopolymer A having a melt flow rate (MFR 2 ) between 0.01 and 300 g/10 min, and
b) 15 wt % or more of at least one propylene ethylene copolymer; and

(II) 2.5 to 30 wt % of a second component comprising at least one ethylene C 1 -C 4 -alkyl (meth)acrylate polymer; and
(III) 5 to 25 wt % of at least one filler.

7. A composition as claimed in claim 1 having a Delta L value of less than 1.

8. A moulded article comprising a composition as defined in claim 1 .

9. A process for making a composition as defined in claim 1 comprising obtaining a first component (I) as hereinbefore defined and blending said first component with said second component (II) and third component (III).

10. A moulded article of claim 8 , wherein the article is an injection moulded article.

11. A composition as claimed in claim 6 , wherein the filler comprises talc.

Assignees

• Bernreitner Klaus
• Braun Juliane
• Grein Christelle
• Grestenberger Georg
• Kniesel Claudia
• Borealis Ag

Inventors

• Bernreitner Klaus
• Braun Juliane
• Grein Christelle
• Grestenberger Georg
• Kniesel Claudia

Classifications

• C08L23/142 Primary

  at least partially crystalline copolymers of propene with other olefins · CPC title

• C08L23/0869

  with unsaturated acids, e.g. [meth]acrylic acid; with unsaturated esters, e.g. [meth]acrylic acid esters · CPC title

• C08L33/10 Primary

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C08K3/0033

  Chemistry & Metallurgy · mapped topic

• C08L2666/06

  Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof · CPC title