EP1021481A1 - Masterbatch composition - Google Patents

Masterbatch composition

Info

Publication number
EP1021481A1
EP1021481A1 EP98948137A EP98948137A EP1021481A1 EP 1021481 A1 EP1021481 A1 EP 1021481A1 EP 98948137 A EP98948137 A EP 98948137A EP 98948137 A EP98948137 A EP 98948137A EP 1021481 A1 EP1021481 A1 EP 1021481A1
Authority
EP
European Patent Office
Prior art keywords
resin
granular
colorant composition
masterbatch
mixture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98948137A
Other languages
German (de)
French (fr)
Inventor
Jean-Luc Andre Patrick Varlet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procter and Gamble Co
Original Assignee
Procter and Gamble Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Priority to EP98948137A priority Critical patent/EP1021481A1/en
Publication of EP1021481A1 publication Critical patent/EP1021481A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
    • C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers

Definitions

  • the invention relates to a process for coloration of plastic resins.
  • a masterbatch is a granular, usually dust free colorant composition comprising substantially high concentrations of pigment.
  • This masterbatch is normally added to a thermo-plastic resin, which is normally in granular form also, prior to processing of the mixture, by extrusion or injection for example.
  • the reason for using the masterbatch technique is that direct coloration with pigments raises issues due to poor dispersion.
  • the masterbatch is also used for minimising the risk of abrasion of the extruders. Indeed, the pigments will tend to cover the surface of the processing apparatus without having a good dispersion within the resin itself.
  • the present invention relates to a process for coloration of a thermoplastic resin comprising the step of mixing the thermoplastic resin in a granular form with a colorant composition comprising pigments to form a granular mixture, the colorant composition being in the granular form during mixing.
  • Existing masterbatch or granular colorant compositions may comprise the pigments together with a carrier.
  • the role of the carrier is to enhance the affinity of the pigment with the thermo-plastic resin for coloration and to improve the dispersion and mixing of the colorant composition with the resin.
  • compositions are disclosed in various documents.
  • EP-A-0 751 171 published on the 2 nd of January 1997 describes a colorant composition whereby the carrier is comprising poly-olefins and poly-acrylate-ester.
  • a different composition is proposed in US-A-5 604 279 granted on the 18 th of February 1997, whereby the colorant composition also comprises poly-olefins together with a free flow agent.
  • Such compositions should facilitate dispersion of the pigment within the final product.
  • these colorant compositions are not compatible with all polymers, and for example have a poor affinity with polypropylene.
  • the present invention provides a process in a manner to satisfy the aforementioned needs.
  • the process of the invention has the mixing step characterised in that the colorant composition comprises a metallocene catalysed resin.
  • the colorant composition of the invention for a masterbatch comprises pigments.
  • the pigments are the colouring agent. They are comprised in a masterbatch because mixing them directly with a thermo-plastic resin may be difficult due to a low affinity.
  • the masterbatch can be mixed with the thermo- plastic resin for coloration. Normally, mixing occurs when the masterbatch and the thermo-plastic resin are in a granular state.
  • the word "resin” refers to a family of materials which can be processed to be in granular form or in liquid form. It is a feature of the process of the present invention that the resin is used in a granular form.
  • the pigments used may be organic or inorganic pigments.
  • a colorant composition usually contains between 15% to 90% by weight, preferably 20% to 80%, more preferably 40% to 60%, most preferably 45% to 55%, of pigments.
  • a colorant composition may contain between 8% to 85% by weight, preferably 18% to 80%, more preferably 18% to 60%, most preferably 43% to 55%, of carrier.
  • Other additives may be used, such as anti-oxydant, lubricating agents, surface tension reducers or agents facilitating labelling. Such additives may be contained between 0% to 2% by weight in the colorant composition.
  • the carrier may be poly-ethylene, preferably low density poly-ethylene because of its lubricating properties, preferably polypropylene when the masterbatch is for mixing with a poly-propylene thermo- plastic, or for example poly-styrene. Indeed the choice of the carrier often depends on the thermo-plastic resin to be coloured.
  • the colorant composition of the invention comprises a metallocene catalysed resin. Indeed, it was found that a metallocene catalysed resin would significantly improve the homogenisation and dispersion of the pigment in the mixture. Because of the improvement in the masterbatch dispersion, a more uniform phase can be obtained. Consequently, less pigment may be used. Indeed it is an object of the present invention to reduce material costs, in particular pigment costs, while maintaining coloration quality. This objective can be obtained when introducing the metallocene catalysed resins, which differ from, for example, the Ziegler-Natta catalysed resin, in that the molecular weight distribution of metallocene catalysed resins is narrower.
  • the molecular weight distribution is defined here as M w / M n , whereby M w is the weight average molecular weight and M n is the number average molecular weight.
  • a molecular weight distribution of metallocene catalysed resins is typically of less than 3.5, especially from 1.5 to 2.5, whereas the molecular weight distribution of Ziegler-Natta catalysed resin is typically of more than 3.5, most typically of more than 5.
  • the process of the invention is particularly useful for the coloration of thermoplastic resins when the thermoplastic resins to be coloured are made using a Ziegler Natta catalysis. Indeed such resins can be manufactured at low cost, while they can be coloured in an improved manner if using the colorant composition according to the process of the invention.
  • thermoplastic resins which comprise metallocene catalysed resins prior to the mixing step
  • coloration will be improved further if the colorant composition also comprises metallocene catalysed resins according to the invention.
  • Various kinds of metallocene catalysed resins may be used in the colorant composition.
  • Such resins comprise poly-olefins, preferably poly-ethylene or poly-propylene.
  • the choice of the resin to use may depend on the thermo- plastic resin which should be coloured.
  • metallocene catalysed poly-propylene will have an excellent affinity for mixing with a poly-propylene resin to be coloured.
  • the mixture may be processed in different ways. Processes which can be used include injection moulding, blow moulding or injection stretch blow moulding.
  • the thermo-plastic resin to be coloured is a poly-propylene.
  • the thermo-plastic resin to be coloured may be another poly-olefin such as poly-ethylene.
  • the thermo-plastic resin to be coloured may also be a blend of different materials.
  • the metallocene used in the colorant composition is a poly-ethylene, which has a good affinity with polypropylene.
  • the metallocene catalysed resin may be used to replace completely the traditional carrier such as low density poly-ethylene, or may replace it partially only.
  • a colorant composition contains between 8% to 85% by weight, preferably 5% to 70%, more preferably 10% to 60%, even more preferably 15% to 40% and most preferably 20% to 30%, of metallocene catalysed resin.
  • the mixture prepared in the preferred embodiment of the invention may be used for example for injection moulding of a cap for a container, or for blow moulding of a bottle.
  • a poly-propylene cap would be particularly suitable for co-operating with a container for containing consumer goods, whereby the coloration of the product allows recognition by the consumer. Indeed, it is a further object of this invention to obtain good quality colouring.
  • thermo-plastic resin to be coloured may also comprise metallocene catalysed resins which would not be coming from the masterbatch, in which case the proportion of metallocene catalysed resins in the mixture may be higher, and may exceed the total weight of the masterbatch itself.
  • metallocene resin to the masterbatch does not only ease coloration and does not only have aesthetic consequences on the final mixture, but also has consequences on the mechanical properties of the object obtained after processing of the mixture. Indeed, because the pigment has a better dispersion, thus allowing a better crystallisation, the object obtained shows an improved stress cracking resistance, which is a further advantage given by the invention.
  • This aspect of the invention is particularly useful if the object is in contact with a chemically aggressive composition such as an oxidising composition, for example. This particularly applies to packaging of products such as bleach containing compositions.
  • the masterbatch of the example is made of a granular colorant composition comprising 80% by weight of pigments and up to 20% by weight of metallocene catalysed polyethylene having a molecular weight distribution of less than 3.5.
  • the masterbatch can also include additional materials that do not affect its essential character, for instance stabilizers, processing aids such as waxes, deodorizing agents, anti-static agents, anti-blocking agents, plasticizers and the like.
  • the granular thermoplastic resin for coloration is made of Ziegler-Natta catalysed polypropylene having a density of 0.9 g/cm 3 .
  • thermoplastic resin in the granular form is mixed with the masterbatch in the granular form to obtain the granular mixture.
  • the granular mixture is composed of 4% by weight of the granular colorant composition composing the masterbatch and of 96% by weight of the thermoplastic resin.
  • the granular mixture is subsequently injected to obtain the coloured object desired.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)

Abstract

The present invention relates to an improved coloration process for thermoplastic resins using a masterbatch containing pigments. The masterbatch composition is comprising a metallocene catalysed resin as a carrier for the pigment, so as to improve the affinity between the thermo-plastic resin and the pigment to provide a better dispersion.

Description

MASTERBATCH COMPOSITION
Technical field
The invention relates to a process for coloration of plastic resins.
Background of the invention
Coloration of plastic resins is usually achieved using a masterbatch. A masterbatch is a granular, usually dust free colorant composition comprising substantially high concentrations of pigment. This masterbatch is normally added to a thermo-plastic resin, which is normally in granular form also, prior to processing of the mixture, by extrusion or injection for example.
The reason for using the masterbatch technique is that direct coloration with pigments raises issues due to poor dispersion. The masterbatch is also used for minimising the risk of abrasion of the extruders. Indeed, the pigments will tend to cover the surface of the processing apparatus without having a good dispersion within the resin itself.
The present invention relates to a process for coloration of a thermoplastic resin comprising the step of mixing the thermoplastic resin in a granular form with a colorant composition comprising pigments to form a granular mixture, the colorant composition being in the granular form during mixing.
Existing masterbatch or granular colorant compositions may comprise the pigments together with a carrier. The role of the carrier is to enhance the affinity of the pigment with the thermo-plastic resin for coloration and to improve the dispersion and mixing of the colorant composition with the resin.
Such compositions are disclosed in various documents. EP-A-0 751 171 published on the 2nd of January 1997 describes a colorant composition whereby the carrier is comprising poly-olefins and poly-acrylate-ester. A different composition is proposed in US-A-5 604 279 granted on the 18th of February 1997, whereby the colorant composition also comprises poly-olefins together with a free flow agent. Such compositions should facilitate dispersion of the pigment within the final product. However, these colorant compositions are not compatible with all polymers, and for example have a poor affinity with polypropylene.
Consequently, it is an object of the present invention to provide a coloration process allowing better dispersion of pigments in a thermoplastic resin.
Summary of the invention
The present invention provides a process in a manner to satisfy the aforementioned needs.
The process of the invention has the mixing step characterised in that the colorant composition comprises a metallocene catalysed resin.
Detailed description of the invention
The colorant composition of the invention for a masterbatch comprises pigments. The pigments are the colouring agent. They are comprised in a masterbatch because mixing them directly with a thermo-plastic resin may be difficult due to a low affinity. Once the pigments are integrated in a masterbatch, usually together with a carrier, the masterbatch can be mixed with the thermo- plastic resin for coloration. Normally, mixing occurs when the masterbatch and the thermo-plastic resin are in a granular state. The word "resin" refers to a family of materials which can be processed to be in granular form or in liquid form. It is a feature of the process of the present invention that the resin is used in a granular form. The pigments used may be organic or inorganic pigments. A colorant composition usually contains between 15% to 90% by weight, preferably 20% to 80%, more preferably 40% to 60%, most preferably 45% to 55%, of pigments.
Other ingredients may be added to a colorant composition, among which a carrier. Preferably, a colorant composition contains between 8% to 85% by weight, preferably 18% to 80%, more preferably 18% to 60%, most preferably 43% to 55%, of carrier. Other additives may be used, such as anti-oxydant, lubricating agents, surface tension reducers or agents facilitating labelling. Such additives may be contained between 0% to 2% by weight in the colorant composition.
In traditional colorant composition, the carrier may be poly-ethylene, preferably low density poly-ethylene because of its lubricating properties, preferably polypropylene when the masterbatch is for mixing with a poly-propylene thermo- plastic, or for example poly-styrene. Indeed the choice of the carrier often depends on the thermo-plastic resin to be coloured.
The colorant composition of the invention comprises a metallocene catalysed resin. Indeed, it was found that a metallocene catalysed resin would significantly improve the homogenisation and dispersion of the pigment in the mixture. Because of the improvement in the masterbatch dispersion, a more uniform phase can be obtained. Consequently, less pigment may be used. Indeed it is an object of the present invention to reduce material costs, in particular pigment costs, while maintaining coloration quality. This objective can be obtained when introducing the metallocene catalysed resins, which differ from, for example, the Ziegler-Natta catalysed resin, in that the molecular weight distribution of metallocene catalysed resins is narrower. The molecular weight distribution is defined here as Mw/ Mn, whereby Mw is the weight average molecular weight and Mn is the number average molecular weight. A molecular weight distribution of metallocene catalysed resins is typically of less than 3.5, especially from 1.5 to 2.5, whereas the molecular weight distribution of Ziegler-Natta catalysed resin is typically of more than 3.5, most typically of more than 5.
The process of the invention is particularly useful for the coloration of thermoplastic resins when the thermoplastic resins to be coloured are made using a Ziegler Natta catalysis. Indeed such resins can be manufactured at low cost, while they can be coloured in an improved manner if using the colorant composition according to the process of the invention. In the case of a coloration of thermoplastic resins which comprise metallocene catalysed resins prior to the mixing step, coloration will be improved further if the colorant composition also comprises metallocene catalysed resins according to the invention. Various kinds of metallocene catalysed resins may be used in the colorant composition. Such resins comprise poly-olefins, preferably poly-ethylene or poly-propylene. The choice of the resin to use may depend on the thermo- plastic resin which should be coloured. For example, metallocene catalysed poly-propylene will have an excellent affinity for mixing with a poly-propylene resin to be coloured.
Once the mixing of the masterbatch with the thermo-plastic resin to be coloured is achieved, the mixture may be processed in different ways. Processes which can be used include injection moulding, blow moulding or injection stretch blow moulding.
In a preferred embodiment of the invention, the thermo-plastic resin to be coloured is a poly-propylene. The thermo-plastic resin to be coloured may be another poly-olefin such as poly-ethylene. The thermo-plastic resin to be coloured may also be a blend of different materials. The metallocene used in the colorant composition is a poly-ethylene, which has a good affinity with polypropylene. The metallocene catalysed resin may be used to replace completely the traditional carrier such as low density poly-ethylene, or may replace it partially only. Preferably, a colorant composition contains between 8% to 85% by weight, preferably 5% to 70%, more preferably 10% to 60%, even more preferably 15% to 40% and most preferably 20% to 30%, of metallocene catalysed resin. The mixture prepared in the preferred embodiment of the invention may be used for example for injection moulding of a cap for a container, or for blow moulding of a bottle. Such a poly-propylene cap would be particularly suitable for co-operating with a container for containing consumer goods, whereby the coloration of the product allows recognition by the consumer. Indeed, it is a further object of this invention to obtain good quality colouring. This can be achieved while controlling the costs as the metallocene catalysed resin is present in the granular mixture preferably in the proportion of 0.1 % to 10% by weight of the mixture, more preferably between 0.1 % and 8%, most preferably between 0.2% and 2%. The thermo-plastic resin to be coloured may also comprise metallocene catalysed resins which would not be coming from the masterbatch, in which case the proportion of metallocene catalysed resins in the mixture may be higher, and may exceed the total weight of the masterbatch itself.
The addition of metallocene resin to the masterbatch does not only ease coloration and does not only have aesthetic consequences on the final mixture, but also has consequences on the mechanical properties of the object obtained after processing of the mixture. Indeed, because the pigment has a better dispersion, thus allowing a better crystallisation, the object obtained shows an improved stress cracking resistance, which is a further advantage given by the invention. This aspect of the invention is particularly useful if the object is in contact with a chemically aggressive composition such as an oxidising composition, for example. This particularly applies to packaging of products such as bleach containing compositions.
The example which follows explains the invention:
Example:
The masterbatch of the example is made of a granular colorant composition comprising 80% by weight of pigments and up to 20% by weight of metallocene catalysed polyethylene having a molecular weight distribution of less than 3.5. The masterbatch can also include additional materials that do not affect its essential character, for instance stabilizers, processing aids such as waxes, deodorizing agents, anti-static agents, anti-blocking agents, plasticizers and the like.
The granular thermoplastic resin for coloration is made of Ziegler-Natta catalysed polypropylene having a density of 0.9 g/cm3.
The thermoplastic resin in the granular form is mixed with the masterbatch in the granular form to obtain the granular mixture. In this example, the granular mixture is composed of 4% by weight of the granular colorant composition composing the masterbatch and of 96% by weight of the thermoplastic resin. The granular mixture is subsequently injected to obtain the coloured object desired.

Claims

What is claimed is:
1. A process for coloration of a thermoplastic resin comprising the step of mixing the thermoplastic resin in a granular form with a colorant composition comprising pigments to form a granular mixture, the colorant composition being in the granular form during mixing, the mixing step being characterised in that the colorant composition comprises a metallocene catalysed resin.
2. A process as in claim 1 , whereby the process further comprises the step of using the mixture for injection moulding of a closure for a container.
3. A process as in claim 1 , whereby the process further comprises the step of using the mixture for blow moulding of a container.
4. A process as in claim 2 or 3, whereby the container is used for containing a chemically aggressive composition.
5. A process as in claim 1 , whereby the thermoplastic resin is a polyolefin resin, preferably made using Ziegler-Natta catalysis.
6. A process as in claim 5, whereby the polyolefin resin is a poly-propylene resin.
7. A process as in claim 1 , whereby the metallocene catalysed resin is comprised in the granular colorant composition in a proportion of 0.1 % to 10% of the granular mixture weight.
8. A process according to claim 1 , whereby the granular colorant composition comprises pigments in a proportion of 20% to 80% of the weight of the granular colorant composition and whereby the metallocene catalysed resin is comprised in the granular colorant composition in a proportion of 1 % to 80% of the weight of the granular colorant composition.
9. A process according to claim 1 , whereby the metallocene catalysed resin is a poly-ethylene.
10. A process according to claim 1 , whereby the metallocene catalysed resin acts as a carrier for the pigments.
EP98948137A 1997-09-11 1998-09-08 Masterbatch composition Withdrawn EP1021481A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98948137A EP1021481A1 (en) 1997-09-11 1998-09-08 Masterbatch composition

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP97202794 1997-09-11
EP97202794A EP0902045A1 (en) 1997-09-11 1997-09-11 Masterbatch composition
PCT/US1998/018884 WO1999012997A1 (en) 1997-09-11 1998-09-08 Masterbatch composition
EP98948137A EP1021481A1 (en) 1997-09-11 1998-09-08 Masterbatch composition

Publications (1)

Publication Number Publication Date
EP1021481A1 true EP1021481A1 (en) 2000-07-26

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP97202794A Withdrawn EP0902045A1 (en) 1997-09-11 1997-09-11 Masterbatch composition
EP98948137A Withdrawn EP1021481A1 (en) 1997-09-11 1998-09-08 Masterbatch composition

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP97202794A Withdrawn EP0902045A1 (en) 1997-09-11 1997-09-11 Masterbatch composition

Country Status (8)

Country Link
EP (2) EP0902045A1 (en)
JP (1) JP2001515939A (en)
CN (1) CN1278280A (en)
AU (1) AU9477098A (en)
BR (1) BR9812766A (en)
CA (1) CA2303066A1 (en)
TR (1) TR200000686T2 (en)
WO (1) WO1999012997A1 (en)

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ES2223635T5 (en) * 1999-12-13 2007-07-01 Basf Aktiengesellschaft CONCENTRATE OF PIGMENTS AND PROCEDURE FOR OBTAINING.
ES2250354T3 (en) * 2000-03-01 2006-04-16 Clariant Produkte (Deutschland) Gmbh DISPERSING PIGMENTS IN POLYOLEFINS.
DE10159955A1 (en) 2001-12-06 2003-06-26 Clariant Gmbh Use of polar modified polyolefin waxes in photo toners
CA2483899C (en) * 2003-04-30 2009-01-06 Dainippon Ink And Chemicals, Inc. Masterbatch pellet mixture
DE102006039913A1 (en) 2006-08-12 2008-02-14 Clariant International Limited Highly filled colorant composition for coloring and modifying olefinic and non-olefinic plastics
JP4748541B2 (en) * 2008-11-21 2011-08-17 東洋アルミニウム株式会社 Master batch for coloring synthetic resin
WO2012119956A1 (en) * 2011-03-04 2012-09-13 Total Research & Technology Feluy Method of preparing pelleted polyethylene products
CN102617916A (en) * 2012-04-06 2012-08-01 广州远华色母厂有限公司 Composition of color high-concentration mono-color master batch for polyolefin
US20140336327A1 (en) * 2013-05-08 2014-11-13 Equistar Chemicals, Lp Polyolefin masterbatch based on grafted polypropylene and metallocene catalyzed polypropylene
MX2018009156A (en) 2016-01-27 2018-12-06 Tokyo Printing Ink Mfg Co Ltd Masterbatch, resin molding material, molded body, production method of these, and masterbatch evaluation method.
CN106750869B (en) * 2016-12-27 2019-08-23 成都菲斯特新材料有限公司 A kind of polypropylene-polyethylene bicomponent fibers color concentrate and preparation method thereof

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JP2999344B2 (en) * 1993-05-27 2000-01-17 三菱化学株式会社 Ethylene resin composition
DE4443316A1 (en) * 1994-03-15 1995-09-21 Hoechst Ag Colorant preparation for the production of masterbatches
GB9417172D0 (en) * 1994-08-25 1994-10-12 Sandoz Ltd Improvements in or relating to organic compounds
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Also Published As

Publication number Publication date
WO1999012997A1 (en) 1999-03-18
AU9477098A (en) 1999-03-29
TR200000686T2 (en) 2000-11-21
CA2303066A1 (en) 1999-03-18
JP2001515939A (en) 2001-09-25
EP0902045A1 (en) 1999-03-17
BR9812766A (en) 2000-12-12
CN1278280A (en) 2000-12-27

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