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WO2007070971A1 - Revetement interne empechant la formation de peaux pour contenants de composition - Google Patents

Revetement interne empechant la formation de peaux pour contenants de composition Download PDF

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Publication number
WO2007070971A1
WO2007070971A1 PCT/AU2006/001980 AU2006001980W WO2007070971A1 WO 2007070971 A1 WO2007070971 A1 WO 2007070971A1 AU 2006001980 W AU2006001980 W AU 2006001980W WO 2007070971 A1 WO2007070971 A1 WO 2007070971A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
skinning
plastic component
coating composition
water based
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.)
Ceased
Application number
PCT/AU2006/001980
Other languages
English (en)
Inventor
Rodney Alan Vockler
Mark Kerr
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.)
Orica Australia Pty Ltd
Original Assignee
Orica Australia Pty Ltd
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
Priority claimed from AU2005907207A external-priority patent/AU2005907207A0/en
Application filed by Orica Australia Pty Ltd filed Critical Orica Australia Pty Ltd
Priority to NZ569470A priority Critical patent/NZ569470A/en
Priority to AU2006326859A priority patent/AU2006326859B2/en
Publication of WO2007070971A1 publication Critical patent/WO2007070971A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
    • B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
    • B44D3/12—Paint cans; Brush holders; Containers for storing residual paint

Definitions

  • the present invention relates generally to containers for water based coating compositions.
  • Containers for water based coating compositions may be provided in a variety of shapes and sizes and typically comprise a container body and a closure means such as a lid.
  • the containers may also comprise ancillary components such as a wipe surface to facilitate removal of excess coating composition from a coating applicator, or a spout structure to facilitate pouring of the coating composition out of the container.
  • Container components such as the container body, closure means, wipe surface and spout structure are commonly made from plastic or metal.
  • a skin originating from the coating composition can form on the surface of those parts of the container which make contact with the coating composition. This skin is unlikely to revert back to the liquid form of the coating composition and therefore will not reincorporate into the bulk coating composition upon stirring or shaking. Skin formation of the coating composition is believed to primarily result from temperature differentials of the coating composition within different locations of the container and subsequent evaporation of water from the coating composition in regions within the container that are prone to skin formation. Detailed theories relating to skin formation may be found in US635063 and WO 00/27725.
  • Skin formation of the coating composition on container components is undesirable in that skin may fall from the surface of the component where it has formed into the bulk coating composition. Where this problem does occur, application of the coating composition to a surface, for example by brushing, can result in the transfer of the skin lumps to the substrate being coated.
  • the spray application of a bulk coating composition effected in this manner can also lead to blockage of the spray equipment. While it may be possible to remove skinned composition from the bulk composition through filtration, this can be time consuming and is generally unacceptable to the end users of the coating compositions. It would therefore be desirable to avoid or minimise the transfer of skin from container surfaces to the bulk coating composition.
  • skinning For convenience, the problem of the transfer of skin from surfaces of the container into the bulk coating composition will hereinafter be referred to as "skinning".
  • Metal container components do not generally present a significant skinning problem as the coating composition tends to adhere very well to the metal components.
  • the surface of such metal components is coated with a baked epoxy layer such as EPONTM.
  • the baked epoxy layer is used to primarily inhibit rust of the metal components, but is also believed to promote adhesion of the coating composition to the metal component.
  • Containers for water based coating compositions may also comprise plastic components.
  • Such containers can have one or more plastic components, for example a plastic container body, a plastic closure, and plastic structures that function as a wipe surface and/or spout.
  • the entire container may even be made from a plastic material.
  • plastic components used in these containers are often prone to skinning as most water borne coating compositions have poor adhesion to plastic materials.
  • WO 00/27725 contemplates promoting adhesion between the coating composition and plastic components by texturising the surface thereof to increase the surface area contact between the coating composition and the component.
  • texturisation of some plastic components can be practically difficult to achieve and can be expensive to implement.
  • WO 01/32442 discloses a container for water based paints wherein the plastic components thereof are coated with a two part epoxy resin coating system. The coated plastic components are said to reduce the effects of skinning.
  • the present invention provides a container for a water based coating composition, the container comprising at least one plastic component having an anti-skinning surface layer which makes contact with the water based coating composition during normal use of the container, wherein the anti-skinning layer is formed from a single part coating system and has a surface tension of at least 38 dynes/cm.
  • the present invention further provides a plastic component for a container suitable for a water based coating composition, the plastic component having an anti-skinning surface layer which makes contact with the water based coating composition during normal use of the container, wherein the anti-skinning layer is formed from a single part coating system and has a surface tension of at least 38 dynes/cm.
  • the invention also provides a method of modifying a plastic component for a container suitable for a water based coating composition, said method comprising applying an anti- skinning coating to a surface of the plastic component that makes contact with the water based coating composition during normal use of the container, wherein the anti-skinning coating is a single part coating system and forms on said surface of the plastic component an anti-skinning layer having a surface tension of at least 38 dynes/cm.
  • the invention further provides a plastic component for a container suitable for a water based coating composition, wherein said component is modified in accordance with the method defined immediately above.
  • plastic components with an anti-skinning surface layer that 1) is formed from a single part coating system, and 2) has a surface tension of at least 38 dynes/cm, have little if no susceptibility to skinning.
  • anti- skinning is intended to be an expression of when the problem of the transfer of skin from surfaces of the container into the bulk coating composition is minimised if not avoided all together.
  • the anti-skinning property of the plastic components can be obtained by relatively simple processing techniques in a cost effective manner.
  • the use of a single part coating system to provide for the anti-skinning surface layer simplifies and renders the production of the plastic components more cost effective.
  • the surface tension of at least 38 dynes/cm of the anti-skinning surface layer promotes adhesion of the water based coating composition to the plastic component.
  • the anti-skinning surface layer is believed to function as a tie layer between the plastic component and the coating composition and prevent or minimise the problem of skinning.
  • water based coating composition is intended to embrace various water based surface coating products such as paints, varnishes, stains, inks and other surface coating materials prone to the problem of skinning.
  • Containers for water based coating compositions in accordance with the invention will generally comprise components such as a container body and a container closure.
  • the container body is preferably a pail and the container closure is preferably a lid.
  • Pail-like containers are well known in the art and may have any shape suitable for containing water based coating compositions.
  • the containers have a circular cross section, but containers having substantially square or rectangular cross sections are also known.
  • the containers of the invention may also be of any size, with preferred sizes ranging from about 250ml up to greater than 50 litres. In practice, the only limitation placed on the size of the containers is a practical one in that the containers will generally be of a size that is capable of being carried by a user to the desired point of application of the coating composition.
  • containers of the present invention are of a size suitable to contain about 250ml to about 50 litres, more preferably about 1, about 2, about 4, about 10, about 12.5, about 15 and about 20 litres of coating composition.
  • the container closure may also be provided in a variety of shapes and sizes and can engage with the container body in any number of ways.
  • the size and shape of the container closure will, at least to some extent, generally be dictated by the size and shape of the container body.
  • a container closure can engage a container body to provide the desired closure of the container.
  • the container closure and the container body may engage via a screw thread, via lugs, or via a snap fit.
  • the function of the closure may be an important feature of a container to ensure that the coating composition is adequately contained, it will be appreciated that the shape and size of the container closure and how the container closure engages the container body is not particularly important for the purposes of working the present invention.
  • Containers in accordance with the invention may also comprise a structure that functions as a wipe surface to facilitate removal of excess coating composition from a coating applicator such as a brush.
  • Such structures will generally have a relatively sharp edge that extends at least partially over an aperture in the container body such that when the coating applicator is wiped on the relatively sharp edge excess coating composition falls back into the bulk coating composition for reuse.
  • a container in accordance with the invention may also comprise a structure that functions as a spout to facilitate pouring the water based coating composition out of the container.
  • Such a structure will generally extend out from the container body and be shaped to concentrate the flow of the coating composition through or over the structure as the container is tipped.
  • the term "spout" is not intended to define any particular shape of the structure but rather the function of concentrating a flow of coating composition to facilitate pouring of the coating composition out of the container.
  • the spout may be of any shape or size provided that it provides for this function.
  • the wipe surface and the spout may be in the form of separate components or may form together a single component.
  • a container in accordance with the invention comprising a water based coating composition will generally be provided with a container closure to engage with the container body and achieve the desired closure of the container.
  • structures that function as a wipe surface and/or spout may or may not be provided with the container comprising the coating composition at the point of sale.
  • these structures may be manufactured independent of the container body and closure and be offered for sale to a user as an ancillary container component.
  • the structures will typically be adapted to securely engage some part of the container when in use.
  • Such independently manufactured structures may also be fitted to a container body or closure to form part of the overall container structure at the point of sale.
  • structures that function as a wipe surface and/or spout may be formed integral with the container body and/or the container closure.
  • a container in accordance with the invention may be made from any suitable material (e.g. plastic and/or metal) provided that the container comprises at least one plastic component having an anti-skinning surface layer which makes contact with the water based coating composition during normal use of the container.
  • the expression “during normal use of the container” is meant normal use of the container comprising the coating composition.
  • this would include storage and transport of a container comprising the coating composition, shaking of the coating composition within the container, pouring the coating composition out of the container, and gaining access to the coating composition within the container using an applicator such as a brush or spray device.
  • the at least one plastic component of the container is selected from a plastic container body, a plastic container closure, a plastic structure that functions as a wipe surface to facilitate removal of excess coating composition from a coating applicator, a plastic structure that functions as a spout to facilitate pouring of the water based coating composition out of the container, and combinations thereof.
  • the container comprises a plastic or metal container body and a plastic container closure, with one or both plastic components having the required anti- skinning surface layer.
  • such a container further comprises a plastic structure that functions as a wipe surface and/or a plastic structure that functions as a spout, with one or both of these components also having the required anti-skinning surface layer
  • Preferred plastic materials from which the at least one plastic component may be made of include, but are not limited to, polyolefms such as polyethylene (e.g. high density polyethylene (HDPE), low density polyethylene (LDPE) and linear low density polyethylene (LLDPE)) and polypropylene (PP), and polyesters such as polyethylene terephthalate (PET).
  • polyethylene e.g. high density polyethylene (HDPE), low density polyethylene (LDPE) and linear low density polyethylene (LLDPE)
  • PP polypropylene
  • PET polyethylene terephthalate
  • the at least one plastic component used in accordance with the invention may be fabricated using techniques well known in the art such injection moulding, blow moulding, rotational moulding, extrusion, thermoforming and the like.
  • the container comprises at least one plastic component having an anti-skinning surface layer.
  • anti- skinning surface layer is intended to denote a layer of material that is located on the surface of at least one plastic component of the container. This surface layer is believed to function as a tie layer between the at least one plastic component and the coating composition to promote adhesion between the plastic component and the coating composition and thereby avoid or reduce the problem of skinning.
  • the layer of material is believed to function as an "anti-skinning" surface layer by promoting adhesion of the coating composition to the plastic component.
  • the anti-skinning surface layer is present on the at least one plastic component as a substantially continuous coating and with a substantially uniform thickness.
  • the anti-skinning surface layer will have a thickness ranging from about 1 micron to about 50 microns, preferably from about 5 microns to about 25 microns.
  • the anti-skinning surface layer is formed from a single part coating system.
  • a single part coating system is distinct from a multi part (e.g. two part) coating system in that the former does not require the addition of a curing agent prior to the application of the coating whereas the latter does.
  • the addition of curing agent is required
  • those skilled in the art will also appreciate that once the curing agent has been added there is a relatively short period of time available to apply the composition to the desired substrate before the composition cures into an unworkable mass.
  • Multi part coating compositions therefore present a number of practical processing problems such as the correct weighing of each component, the inability to store unused coating composition for subsequent use, and difficulties with cleaning application equipment on or in which the coating composition has cured.
  • single part coating systems used in accordance with the invention will generally cure primarily through solvent evaporation and therefore enable unused composition to be readily stored in a sealed container for future use. Furthermore, due to more generous curing times associated with single part coating systems, the cleaning of application equipment is generally much easier.
  • the anti-skinning layer formed from the single part coating system has a surface tension of at least 38 dynes/cm (mili N/m).
  • surface tension can be readily measured using standard test ink sets available from companies such as 3DT LLC (USA).
  • standard test ink sets contain ink having a range of known surface tensions that may be sequentially applied to the surface of interest.
  • the surface tension of the surface to be tested is said to correspond to that of the test ink which first, in sequential test order (i.e. low dyne to high dyne), enables a continuous line to be drawn on the test surface.
  • the surface tension of the anti-skinning layer ranges from 38 to about 46 dynes/cm.
  • Polyolefms such as polyethylene and polypropylene typically have a surface tension of about 30 dynes/cm. Accordingly, the effect of applying the anti-skinning layer onto such plastic materials is to increase their effective surface tension. It is preferred that such an increase in surface tension is provided in an even and uniform fashion across the surface of the at least one plastic component. As discussed above, the required surface tension provided by the anti-skinning layer is believed to promote adhesion between the coating composition and the at least one plastic component.
  • the surface of plastic material to be coated is flame treated or exposed to carona discharge to further enhance the adhesion between the anti-skinning layer and the plastic.
  • the coating may be conveniently applied using any conventional technique employed in the art.
  • the coating may be painted or sprayed onto the at least one plastic component.
  • Application by spraying is preferred as this is typically found to be most commercially acceptable and provides the most complete and consistent coverage of the coating system onto the surfaces of the at least one plastic component.
  • the coating system may be simply left to cure at ambient temperature until dry, or various means can be employed to increase the rate of curing such as air flow drying, exposure to elevated temperatures and the like.
  • the entire component or only parts thereof may be coated with the anti-skinning surface layer.
  • components such as a plastic spout or plastic wipe surface may have their entire surface covered with the anti-skinning surface layer
  • a plastic container body and a plastic container closure may only have their inner surfaces (i.e. the surfaces which the define the inner region of the sealed container) covered with the anti-skinning surface layer.
  • Any single part coating system may be used in accordance with the invention provided that it can form an anti-skinning layer having the required surface tension.
  • the single part coating system will also of course have an adequate binding affinity to the plastic component in order to form the required anti-skinning surface layer.
  • Suitable single part coating systems include, but or not a limited to, those which comprise halogenated polymer. Without wishing to be limited by theory, it is believed that halogenated polymer in such coating systems provides for a desirable surface tension of the resulting anti-skinning layer.
  • Suitable halogenated polymers include, but are not limited to, chlorinated polymers such as chlorinated rubber and co-polymers of vinyl chloride such as a vinyl chloride/vinyl acetate co-polymer, and combinations thereof.
  • Suitable single part coating systems for use in accordance with the invention include, but are not limited to, Luxaprime UMP and Luxachlor T sold by Dulux Australia.
  • the method in accordance with the invention of modifying a plastic component for a container suitable for a water based coating composition may also form part of an overall method of manufacturing the component per se.
  • the invention also provides a method of manufacturing a plastic component for a container suitable for a water based coating composition, said method comprising moulding the plastic component and applying an anti-skinning coating to a surface of the plastic component that makes contact with the water based coating composition during normal use of the container, wherein the anti-skinning coating is a single part coating system and forms on said surface of the plastic component an anti-skinning layer having a surface tension of at least 38 dynes/cm.
  • the method in accordance with the invention of modifying a plastic component for a container suitable for a water based coating composition may also be integrated with a method of packaging a water based coating composition. Accordingly, the invention further provides a method of packaging a water based coating composition, said method comprising the steps of:
  • Containers consisting of the following componentry were evaluated: a metal container body in the form of a pail with a circular cross-section, a high density polythene closure and a polypropylene plastic collar adapted to securely engage the upper rim of the container body, the collar consisting of an integrated plastic structure that functions as a wipe surface to facilitate the removal of excess coating composition from a coating applicator and a plastic structure that functions as a spout to facilitate pouring of the water based coating composition out of the container.
  • the plastic components were flame treated prior to the application of the anti-skinning layer.
  • single part coating systems respectively comprising chlorinated rubber and vinylchloride co-polymer, were each spray applied onto the internal surfaces of separate plastic container closures, collars and integrated wipe surface and spout structures at a dry film thickness of 5-25 microns.
  • the applied coating systems were allowed to cure overnight at ambient temperature.
  • the surface tension of the applied coatings were each assessed using Dyne pens and found to be 40 Dynes/cm.
  • the effectiveness of the respective anti-skinning layers were assessed by filling the assembled container detailed above (i.e. pail, collar and closure) with an acrylic water based formulation that has been shown to exhibit significant skinning tendencies, sealing the container and then inverting the container subjecting the internal surfaces of the plastic componentry to the acrylic water based formulation.
  • the assembled container containing the acrylic water based formulation was placed upright in an environmental chamber set at 40 degrees Celsius for a period of 4 weeks. Comparative assembled containers that did not have the anti-skinning layer applied to the plastic components were also included in the test.

Landscapes

  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Closures For Containers (AREA)

Abstract

L’invention concerne un contenant pour une composition de revêtement aqueuse, ledit contenant comprenant au moins un composant plastique ayant une couche de surface empêchant la formation de peaux, ladite couche de surface étant au contact de la composition de revêtement aqueuse dans des conditions normales d’utilisation du contenant, ladite couche empêchant la formation de peaux étant formée par un système de revêtement monobloc et ayant une tension de surface supérieure ou égale à 38 dynes/cm.
PCT/AU2006/001980 2005-12-21 2006-12-21 Revetement interne empechant la formation de peaux pour contenants de composition Ceased WO2007070971A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NZ569470A NZ569470A (en) 2005-12-21 2006-12-21 An anti-skinning coating for the inside of a container which holds a water based coating composition such as paint
AU2006326859A AU2006326859B2 (en) 2005-12-21 2006-12-21 Internal anti-skinning coating of composition containers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2005907207A AU2005907207A0 (en) 2005-12-21 Coating Composition Containers
AU2005907207 2005-12-21

Publications (1)

Publication Number Publication Date
WO2007070971A1 true WO2007070971A1 (fr) 2007-06-28

Family

ID=38188179

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2006/001980 Ceased WO2007070971A1 (fr) 2005-12-21 2006-12-21 Revetement interne empechant la formation de peaux pour contenants de composition

Country Status (3)

Country Link
AU (1) AU2006326859B2 (fr)
NZ (1) NZ569470A (fr)
WO (1) WO2007070971A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011062995A3 (fr) * 2009-11-20 2011-09-29 Valspar Sourcing, Inc. Partie intérieure de récipient antipeaux
CN118289333A (zh) * 2024-05-13 2024-07-05 中山市富日印刷材料有限公司 一种防结皮环保纸铝复合油墨包装罐

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991005714A1 (fr) * 1989-10-23 1991-05-02 Rhone-Poulenc Agriculture Limited Ameliorations relatives aux recipients
US5213230A (en) * 1992-07-09 1993-05-25 Dean Kral Paint can sealer
WO2000027725A1 (fr) * 1998-11-10 2000-05-18 Resene Paints Limited Procede de conditionnement de preparations a base de solvant ou d'eau en vue d'une reduction de l'usure
WO2001032442A1 (fr) * 1999-11-03 2001-05-10 Viscount Plastics (Vic) Pty Ltd Maitrise de formation de peau concernant des peintures
US20060113712A1 (en) * 2004-11-29 2006-06-01 Azzarello Francis T Plastic paint container with non-stick interior surfaces

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991005714A1 (fr) * 1989-10-23 1991-05-02 Rhone-Poulenc Agriculture Limited Ameliorations relatives aux recipients
US5213230A (en) * 1992-07-09 1993-05-25 Dean Kral Paint can sealer
WO2000027725A1 (fr) * 1998-11-10 2000-05-18 Resene Paints Limited Procede de conditionnement de preparations a base de solvant ou d'eau en vue d'une reduction de l'usure
WO2001032442A1 (fr) * 1999-11-03 2001-05-10 Viscount Plastics (Vic) Pty Ltd Maitrise de formation de peau concernant des peintures
US20060113712A1 (en) * 2004-11-29 2006-06-01 Azzarello Francis T Plastic paint container with non-stick interior surfaces

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011062995A3 (fr) * 2009-11-20 2011-09-29 Valspar Sourcing, Inc. Partie intérieure de récipient antipeaux
CN102666307A (zh) * 2009-11-20 2012-09-12 威士伯采购公司 防结皮容器内部部分
US9044997B2 (en) 2009-11-20 2015-06-02 Valspar Sourcing, Inc. Anti-skinning container interior portion
US9592947B2 (en) 2009-11-20 2017-03-14 Valspar Sourcing, Inc. Anti-skinning container interior portion
CN118289333A (zh) * 2024-05-13 2024-07-05 中山市富日印刷材料有限公司 一种防结皮环保纸铝复合油墨包装罐

Also Published As

Publication number Publication date
NZ569470A (en) 2010-10-29
AU2006326859A1 (en) 2007-06-28
AU2006326859B2 (en) 2011-09-15

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