Composition comprising heterophasic propylene copolymer

Patent metadata

Field	Value
Publication number	US-10167384-B2
Application number	US-201515532172-A
Country	US
Kind code	B2
Filing date	Nov 26, 2015
Priority date	Dec 2, 2014
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

The invention is directed to a composition comprising (A) a heterophasic propylene copolymer, (B) talc and (C) a functionalized polypropylene grafted with an acid or acid anhydride functional group, wherein the heterophasic propylene copolymer consists of (a) a propylene-based matrix, wherein the propylene-based matrix consists of a propylene homopolymer and/or a propylene-α-olefin copolymer consisting of at least 70 wt % of propylene and at most 30 wt % of a-olefin, based on the total weight of the propylene-based matrix and wherein the propylene-based matrix is present in an amount of 90 to 95 wt % based on the total heterophasic propylene copolymer and (b) a dispersed ethylene-α-olefin copolymer, wherein the dispersed ethylene-α-olefin copolymer is present in an amount of 10 to 5 wt % based on the total heterophasic propylene copolymer and wherein the sum of the total amount of propylene-based matrix and total amount of the dispersed ethylene-α-olefin copolymer in the heterophasic propylene copolymer is 100 wt %, wherein the heterophasic propylene copolymer has an MFI of 0.1-0.5 dg/min as determined according to IS01133 at 230° C. and 2.16 kg and wherein the amount of the talc in the composition is 0.025-10 wt % of the total composition and the amount of the functionalized polypropylene is 0.005-2.5 wt % of the total composition.

First claim

The invention claimed is:

1. A composition comprising:
(A) a heterophasic propylene copolymer,
(B) talc and
(C) a functionalized polypropylene grafted with an acid or acid anhydride functional group, wherein the heterophasic propylene copolymer consists of
(a) a propylene-based matrix, wherein the propylene-based matrix consists of a propylene homopolymer and/or a propylene-α-olefin copolymer consisting of at least 70 wt % of propylene and at most 30 wt % of α-olefin, based on the total weight of the propylene-based matrix and
wherein the propylene-based matrix is present in an amount of 90 to 95 wt % based on the total heterophasic propylene copolymer and
(b) a dispersed ethylene-α-olefin copolymer, wherein the dispersed ethylene-α-olefin copolymer is present in an amount of 10 to 5 wt % based on the total heterophasic propylene copolymer and
wherein the sum of the total amount of propylene-based matrix and total amount of the dispersed ethylene-α-olefin copolymer in the heterophasic propylene copolymer is 100 wt %,
wherein the heterophasic propylene copolymer has an MFI of 0.1-0.5 dg/min as determined according to ISO1133 at 230° C. and 2.16 kg and
wherein the amount of the talc in the composition is 0.025-10 wt % of the total composition and the amount of the functionalized polypropylene is 0.005-2.5 wt % of the total composition.

2. The composition according to claim 1 , wherein at least part of the talc is surface-modified.

3. The composition according to claim 2 , wherein at least 80 wt % of the talc is surface-modified.

4. The composition according to claim 2 , wherein the surface-modified talc is surface-modified with a polar substance selected from the group of glycols, silanes, amines and amides.

5. The composition according to claim 1 , wherein the talc has an average particle size d 50 of 0.5 to 5 μm.

6. The composition according to claim 1 , wherein the acid or acid anhydride functional group is selected from the group consisting of (meth)acrylic acid and maleic anhydride.

7. The composition according to claim 1 , wherein the propylene-based matrix consists of a propylene homopolymer.

8. The composition according to claim 1 , wherein the α-olefin in the ethylene-α-olefin copolymer is chosen from the group of α-olefins having 3 to 8 carbon atoms and any mixtures thereof and is preferably propylene.

9. The composition according to claim 1 , wherein, the propylene-based matrix has an MFI of 0.2-0.5 dg/min as determined according to ISO1133 at 230° C. and 2.16 kg.

10. The composition according to claim 1 , wherein the composition has a crystallization temperature at least 120° C., determined with DSC according to ISO 11357-1 to ISO11357-5 using a first heating step at a heating rate of 10 per minute up to 200° C., a dynamic crystallization at a cooling rate of 10° C. per minute down to 25° C. and a second heating step at a heating rate of 10° C. per minute up to 200° C.; and at least one of an Izod impact resistance of at least 13 kJ/m 2 , determined according to ISO 180 4A at 23° C., notch 45° according to ISO 37/2 perpendicular orientation; a flexural modulus of at least 1700 N/mm 2 , determined according to ASTM D790-10; an average shrinkage below 1.70%, determined according to ISO 294-4; and a warpage below 0.90, determined after 24 hours at 23° C.

11. A process for the preparation of the composition according to claim 1 , comprising melt mixing (A), (B) and (C).

12. A method for forming an article from the composition of claim 1 , the method comprising: forming the composition into the article by injection moulding, injection blow moulding, injection stretch blow moulding, rotational moulding, compression moulding, extrusion and extrusion compression moulding, extrusion blow moulding, sheet extrusion, film extrusion, cast film extrusion, foam extrusion, thermoforming or thin-walled injection moulding.

13. An article comprising the composition of claim 1 .

14. The article according to claim 13 , wherein the article is a sewage pipe.

15. A method for increasing crystallization temperature, the method comprising forming the composition of claim 1 .

Assignees

• Sabic Global Technologies Bv

Inventors

• Herklots Marc

Classifications

• C08L23/10 Primary

  Homopolymers or copolymers of propene · CPC title

• B29C45/72

  Heating or cooling · CPC title

• C08L23/26

  modified by chemical after-treatment (saponified copolymers C08L23/0861; unsaturated acid salts C08L23/0876) · CPC title

• C08L23/142

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

• C08L67/04

  Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence) · CPC title