Process for the preparation of a composition comprising heterophasic propylene co-polymer and talc

Patent metadata

Field	Value
Publication number	US-9527989-B2
Application number	US-201314428992-A
Country	US
Kind code	B2
Filing date	Sep 17, 2013
Priority date	Sep 19, 2012
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

The invention relates to a Process for the preparation of a composition comprising a heterophasic propylene copolymer and talc, 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% by mass of propylene and up to 30% by mass of α-olefin, based on the total mass of the propylene-based matrix, wherein the propylene-based matrix is present in an amount of 60 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 40 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 composition has a desired melt flow index in the range of 1 to 200 dg/min as measured according to ISO1133 (2.16 kg/230° C.), wherein at least part of the talc is surface-modified and wherein the amount of talc in the composition is from about 0.5 to at most 5 wt % based on the heterophasic propylene copolymer, comprising the step of (a) melt-mixing the heterophasic propylene copolymer with the talc and a peroxide, wherein the amount of peroxide is chosen such that a composition comprising a heterophasic propylene copolymer and talc having the desired melt flow index is obtained.

First claim

The invention claimed is:

1. A process for the preparation of a composition comprising a heterophasic propylene copolymer and talc, 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% by mass of propylene and up to 30% by mass of ethylene, based on the total mass of the propylene-based matrix, and wherein the propylene-based matrix is present in an amount of 60 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 40 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 composition has a desired melt flow index in the range of 1 to 200 dg/min as measured according to ISO1133 (2.16 kg/230° C.),

wherein at least 80 wt % of the talc is surface-modified with a polar substance comprising ethylene-bis-stearamide and wherein the amount of talc in the composition is from about 0.5 to at most 5 wt % based on the heterophasic propylene copolymer,
comprising the step of
(a) melt-mixing the heterophasic propylene copolymer with the talc and a peroxide,
wherein the amount of peroxide is chosen such that a composition comprising a heterophasic propylene copolymer and talc having the desired melt flow index is obtained,
wherein the α-olefin in the propylene-α-olefin copolymer is selected from the group of α-olefins having 2 or 4-10 carbon atoms,
wherein the amount of ethylene in the ethylene-α-olefin copolymer is in the range of 20-65 wt % based on the ethylene-α-olefin copolymer and
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.

2. The process according to claim 1 , wherein the amount of ethylene in the ethylene-α-olefin copolymer is in the range of 20-65 wt % based on the ethylene-α-olefin copolymer.

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

4. The process 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.

5. The process according to claim 1 , wherein the α-olefin in the ethylene-α-olefin copolymer is propylene.

6. The process according to claim 1 , wherein all talc used in the process is surface-modified.

7. The process according to claim 1 , wherein the peroxide is α,α′-bis-(tert-butylperoxy)diisopropylbenzene, 2,5-dimethyl-2,5-di(tert-butylperoxy)-hexane or 3,6,9-Triethyl-3,6,9-trimethyl-1,4,7-triperoxonane.

8. A process for the preparation of a composition comprising a heterophasic propylene copolymer and talc, 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% by mass of propylene and up to 30% by mass of ethylene, based on the total mass of the propylene-based matrix, and wherein the propylene-based matrix is present in an amount of 60 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 40 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 composition has a desired melt flow index in the range of 1 to 200 dg/min as measured according to ISO1133 (2.16 kg/230° C.),
wherein at least part of the talc is surface-modified, wherein the surface-modified talc is prepared by mixing of a talc with a polar substance, wherein the polar substance is ethylene-bis-stearamide, and wherein the amount of talc in the composition is from about 0.5 to at most 5 wt % based on the heterophasic propylene copolymer,
comprising the step of
(a) melt-mixing the heterophasic propylene copolymer with the talc and a peroxide,
wherein the amount of peroxide is chosen such that a composition comprising a heterophasic propylene copolymer and talc having the desired melt flow index is obtained,
wherein the α-olefin in the propylene-α-olefin copolymer is selected from the group of α-olefins having 2 or 4-10 carbon atoms,
wherein the amount of ethylene in the ethylene-α-olefin copolymer is in the range of 20-65 wt % based on the ethylene-α-olefin copolymer and

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.

9. A composition obtained or obtainable by the process of claim 1 .

10. Shaped article comprising the composition comprising a heterophasic propylene copolymer and talc, 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% by mass of propylene and up to 30% by mass of α-olefin, based on the total mass of the propylene-based matrix wherein the propylene-based matrix is present in an amount of 60 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 40 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 composition has a desired melt flow index in the range of 1 to 200 dg/min as measured according to ISO1133 (2.16 kg/230° C.),
wherein at least 80 wt % of the talc is surface-modified with ethylene-bis-stearamide and wherein the amount of talc in the composition is from about 0.5 to at most 5 wt % based on the heterophasic propylene copolymer, and
wherein the amount of volatile organic compounds as measured through the VOC-value according to VDA278 (30 min, 180° C.) and determined by gas chromatrography is less than 1500 ppm, and/or
wherein the amount of volatile compounds (FOG-value) as measured through the FOG-value according to VDA278 on the second heating (first heating 30 min at 90° C., second heating 1 hour at 120° C.) is less than 500 ppm, and/or
wherein the amount of butanol emitted as measured using VDA 278 (10 min, 180° C.) as determined with gas chromatrography-mass spectrometry (GC-MS) is less than 100 ppm, and/or
wherein the amount of acetone emitted as measured using VDA 278 (10 min, 180° C.) as determined with gas chromatrography-mass spectrometry (GC-MS) is less than 4 ppm, and/or
wherein the amount of isopropenylacetylbenzene as measured using VDA278 (10 min, 180° C.) as determined with gas chromatrography-mass spectrometry (GC-MS) is less than 20, based on the total composition, and/or
wherein the amount of diacetyl benzene as measured using VDA278 (10 min, 180° C.) as determined with gas chromatrography-mass spectrometry (GC-MS) is less than 30, and

wherein the α-olefin in the propylene-α-olefin copolymer is selected from the group of α-olefins having 2 or 4-10 carbon atoms,
wherein the amount of ethylene in the ethylene-α-o

Assignees

• Saudi Basic Ind Corp

Inventors

• Herklots Marc
• Steenbakkers-Menting Henrica Norberta Alberta Maria
• Van Der Ven Maud Corrina Willie

Classifications

• C08L23/10 Primary

  Homopolymers or copolymers of propene · CPC title

• B29L2031/00

  Other particular articles · CPC title

• B29K2023/14

  Copolymers of polypropylene (B29K2023/16 takes precedence) · CPC title

• C08L23/08

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

• C08L2207/02

  Heterophasic composition · CPC title