CA2009462A1 - Low coefficient of friction material and plastic films coated therewith - Google Patents
Low coefficient of friction material and plastic films coated therewithInfo
- Publication number
- CA2009462A1 CA2009462A1 CA002009462A CA2009462A CA2009462A1 CA 2009462 A1 CA2009462 A1 CA 2009462A1 CA 002009462 A CA002009462 A CA 002009462A CA 2009462 A CA2009462 A CA 2009462A CA 2009462 A1 CA2009462 A1 CA 2009462A1
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- weight
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- coating
- wax
- Prior art date
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Abstract
ABSTRACT
A coating for a thermoplastic film includes an acrylic copolymer, a finely divided wax in the amount of 30 to 15%, preferably 30 to 60%, by weight based on the total weight of the copolymer, a finely divided inorganic solid selected from the group consisting of silica, diatomaceous earth, calcium silicate, bentonite and finely divided clays in the amount of 5 to 25% by weight based on the total weight of the copolymer and either talc or Syloid in the amount of 0 to 1% based on the total weight of the copolymer. The coated film has a low haze, non-blocking and consistently low coefficient of friction for good machinability. The coating is applied to a surface of the film as an aqueous dispersion preferably by a gravure coater placed between the machine direction orienter and the transverse direction orienter in an extruding system for the film. This film can be laminated to another film such as glassine or a plastic film.
A coating for a thermoplastic film includes an acrylic copolymer, a finely divided wax in the amount of 30 to 15%, preferably 30 to 60%, by weight based on the total weight of the copolymer, a finely divided inorganic solid selected from the group consisting of silica, diatomaceous earth, calcium silicate, bentonite and finely divided clays in the amount of 5 to 25% by weight based on the total weight of the copolymer and either talc or Syloid in the amount of 0 to 1% based on the total weight of the copolymer. The coated film has a low haze, non-blocking and consistently low coefficient of friction for good machinability. The coating is applied to a surface of the film as an aqueous dispersion preferably by a gravure coater placed between the machine direction orienter and the transverse direction orienter in an extruding system for the film. This film can be laminated to another film such as glassine or a plastic film.
Description
LOW COEF~ICIENT OF FRICrION MATERIAL
AND PLASTIC FILMS COArED r~-~REWIrH
THIS IIW ENTION relates to coating compositions; more particularly, this invention relates to coating compositions which when applied to plastics films result in film structures having low haze, non-blocking and consistently low coefficient of friction S (COF) for good machinability. The present invention also relates to coated plastics films and, to processes for applying the composition to a surface of the plastics film.
Polypropylene films are widely used in the packaging industry because of their superior physical properties, such as high stiffness, excellent~optical clarity, and good moisture barrier characteristics. However, unmodified polypropylene has the disadvantages of having a high inherent COF and film-to-film destructive blocking on storage. The COF characteristics of polypropylene and other thermoplastic films can be beneficially 1S modified by the inclusion in the polymer o fa~ty acid amides.
However, effectiveness of the amides relies upon their ability to migrate to the surface of the films; accordingly, the value of the COF is subject to wide variation depending upon the thermal history which the film experiences during shipping, storage, and certain converting processes. In addition, the presence of such amides on the film surfaces can adversely affect the film's appearance as manifested by an increase in haze, a decrease in gloss and the presence of streaks. The presence of SUC}I amides on the surface can also adversely affect the wettability and adhesion of solvent and water-based inks, coatings, and adhesives.
, -~ .
~F-52l2-L - 2 -It is also known to provide a multi-layer film comprisjng a comparatively thick base layer of an optically clear thermoplastic resin and a comparatively thin surface layer containing a finely divided inorganic material in a proportion sufficient thereby to impart anti-block characteristics and decrease film-to-film COF. The resulting film has non-blocking and improved slip characteristics which do no~ materially vary with thermal history and are obtained without any adverse of the effects on appearance, wetting and adhesion typically experienced with amide-modified films. However, when laminated to other films, for example glassine paper, such films exhibit significantly higher COF values and do not perform flawlessly on convention form, fill and seal machines.
This invention seeks to provide a coated plastics film in which the above-mentioned disadvantages are ameliorated.
In accordance with one aspect of this invention9 there is provided a coating composition, suitable for a plastics film, which composition comprises:
(i) a (meth)acrylic copolymer;
(ii) from 30 to 150~ by weight of (i) of a finely-divided wax;
~iii) from 5 to 25% by weight of ti) of a finely-divided solid comprising silica, diatomaceous earth, calciwn siLicate, clay, or a mixture thereof; and (iv) from O to 1% by weight of (i) of talc or silica gel4 This invention also provides a pIastics film having a coating on and adhered to at least one surface thereof, the coating comprising a composition as herein defined.
This invention further provides a process for the preparation of a coated plastics ilm as herein defined, which process comprises:
providing a coating composition as herein defined; and applying the coating material to a surface of a plastics film.
' ~3~.3 The present invention also provides the use of a coating composition as herein defined to provide laminatable film with low coefficient of friction.
The coating oomposition when applied to a suitabe substrate film has the improved properties of low haze, excellent non-blocking and a consistently low coefficient of friction. The film has these properties even when laminated to another film, such as glassine or a plastic film.
As used herein, the term "(meth)acrylic copolymer" means a copolymer comprising acrylic or methacrylic residues or acrylic and methacrylic residues.
The coating composition of the present invention is composed of a (meth)acrylic copolymer (i), a finely-divided wax (ii), a finely divided incrganic solid material (iii), and optionally, a small amount of either talc or Syloid (a proprietary silica gel) (iv).
The (meth)acrylic copolymer (i) suitably comprises a monoethylenically unsaturated carboxylic acid, preferably comprising acrylic acid~ methacrylic acid or a mixture thereof, and the neutral monomer suitably comprises an ester, preferably comprising an alkyl acrylate, an alkyl methacryla-te or a mixture thereoE. A particularly preferred acrylic copol~ner and its preparation is described in IJ S Patent No. 3,753,769.
It is preferred that the unsaturated carboxylic acid is present in the copolymer in the amount of 2 to 20 parts by weight, and the neutral monomer is present in the amount of 98 to 80 parts by weight.
The finely-divided wax (ii) may be a natural wax, such as paraffin wax, microcrystalline wax, beeswax, carnauba wax, japan wax or montan wax; or a synthetic wax, such as a hydrogenated castor oil, chlorinated hydrocarbon wax, or a long chain fatty acid amide. The wax is preEerably present in the amount of 30 to 60% by weight based on the total weight of the acrylic copolymer.
.
.
F-5212-L - 4 - ~3~3~ ;2 The finely-divided inorganic solid (iii) may comprise, as clay, bentonite. The talc or Syloid is present in the amount of 0 to 1~ by weight based on the total weight of the acrylic copolymer.
The coated plastics film of this invention is suitably a thermoplastics film, preferably a film comprising a polyolefin, especially polypropylene. Desirably, the film is oriented.
The coating composition of the present invention can be applied to the surface of a film material in any convenient and known manner, such as by gravure coating, roll coating, dipping, or spraying. However, it is preferable to apply it by a gravure coater which can be positioned between the machine direction ~MD) orienter and the transverse direction (TD) orienter in an extruding system for the film. Also, the surface of the film is preferably treated to ensure that the coating will be strongly adherent to the film. This treatment may be accomplished by employing known prior art techniques, such as film chlorination, that is, exposure of the film to gaseous chlorine; treatment with oxidizing agents such as chromic acid; hot air or steam treatment; or flame treatment.
However, a particularly desirable method of treatment has been found to be the so called electronic treatment which comprises exposing the film surEace to a high volta~e corona dischar~
while passing the fllln between a pair of spaced electrodes.
After electronic treatment of the substrate film surface, it may be coated with the coating composition of the present invention which coating will then exhibit a tendency to more strongly a&ere to the treated film surface.
It is possible to add the coating composition of the present invention onto the surface of the treated film substrate from a non-aqueous solution of the composition using, for example, various organic solvents such as alcohols, ketones, and esters. However, since the coating compositions of the present invention contain colloidal inorganic materials 3~
and since such materials are difficult to keep well dispersed in organic solvents, it is preferable that the coating compositions of the present invention be applied from aqueous media and preferably from an alkaline aqueous solution thereof The following Examples illustrate the invention.
EXAMPLE I
An aqueous coating dispersion was prepared in a 5 liter flask by mixing the following ingredients:
Parts by weight Deionized water 680 hcrylic Emulsion (33.5%) 1,300 Aqueous Ammonia (7.36%) 20 Ludox Silica Dispersion (20%) 218 Carnauba Wax Emulsion (20%) 784 Talc (5%) 87 The acrylic emulsion ws supplied by Valspar Corporation and was a copolymer of 51~5% methyl methacrylate, 44.5% methyl acrylate, and 4.0~ methylacrylic acid. The coating dispersion had a solids content of 20.7%, a P!`l of 8.0, and viscosity tBrookfield) of 20 centlpo;se.
The coating dispersion was placed in a gravure coater which had been installed between the MD orienter and the TD
orienter of a pilot scale film orienter.
Polypropylene resin (Fina 828) was extruded through a flat sheet die at 250C, cast onto a cooling drum and quenched at 30C. The sheet, about 30 mil thick, was reheated to 140C
and stretched 5 fold in the MD, then corona treated for improved surface wettability. When passing through the gravure coater, the MD oriented film web, now about 6 mil thick, was coated with the coating dispersion. The coated web was dried in pre-heat zones at 160C, then stretched 8 fold in the TD
orienter at 145C and annealed at 160C. The biaxially stretched film, measured 0.75 mil thick, was corona treated on the uncoated side to improve the wettability and adhesion of ink and adhesives that might be applied later on. The coated film had the following properties:
COF 0.15-0.40 Blocking 5g/inch Haze 2.5%
Gloss at 45 80 Coating Weight 0.1-0.4 mg/in2 A series of coating compositions were prepared in the same manner as described in EXA~LE 1. In these compositions, the weight percentage of the silica, wax, and talc were varied as shown in TABLE 1.
~ 'r~L~
¦ Sample ¦ Acrylic Silica l~ax ~ raTc ~P~~j 2 1 100 10 36 0.25 0.2~-3 1 100 10 ~0 0~25 0.21 ~ 100 10 40 1.0 0.27 100 10 45 0.25 0.18 6 1 100 10 ~5 1.0 0.20 7 1 100 10 50 1.0 0.19 i ~ I 100 20 50 1.0 0.23 1 9 t loo lo ss l.o 0.18 1 1 10 1 100 10 60 1.0 0.18 1 i _ The COF of each of these samples is shown in TABLE 1 and was measured from coated films with similar coating weights of about 0.2 mg/in2.
The control coating compositions shown in TABLE 2 were made under the same conditions as described in EXAMPLE 1:
I i TABLE 2 I Sample IAcrylic Silica l~iax Talc Com~ents i A : ¦: 100 40 9 0.1 Very hazy~film and unacceptable¦
l l COF (0.60) I B ¦ 100 10 9 0.25 Very clear film ¦
1 1 - but unacceptable CO~ (0.58) C I 100 10 18 0.25 Very clear film I
I f but unacceptablel I : I : COF (0.49) The composition of Sample A was a heat seal coating based on the coatings described in U.S. Patent ~o. 3,753,769.
_ The slip coated ~ilms obtained from EXAMPLE 1, hereinafter referred to as Sample 1, Samples 3, 4 and 8 of EXAMPLE 2, Sample B of E.XAMPLE 3, and two additional control Samples were extrusion laminated by means of a low density polyethylene adhesive to a 1.6 mil thick glassine paper and tested on Miro Pak Miramatic ~lodel L vertical form, fill and seal packaging ~achine and the results are given in TABL~ 3, ¦ Sample 7 COF ~ FOFC ~Ibs) 3 1 0.21 lg 1 4 1 0.20 20 : l 3Q I 8 1 0.13 1~ : 7 ¦ B ¦ 0.60 45 75 LCM-W ¦ O.21 34 410 LCM ¦ 0.20 20 .
Sample 75 LCM-W was a commercial slip film based on U.S.
Patent ~o. 4,618, 527, and Sample 410 LCM was a commercial slip film based on eracamide as a sole slip agent.
For practical commercial packaging applications, the force over the forming collar (FOFC should be less than 30 lbs.
for a supported film. Otherwise, the film will risk machine downtime because of machine jamming and high squeal noise.
Samples 1, 3, 4 and 8 made in accordance with the present invention all had FOFC values-well below 30 lbs. and therefore they can be used satisfactorily on the packaging machinery with high reliability.
It can be seen from EXAMPLES 1 and 2 that all of the coating compositions of the present invention had low COF.
When comparing the compositions of EXAMPLES 1 and 2 with those of the control compositions in EXAMPLE 3, which had much higher COFs, it can be seen that the compositions of the present invention contains a much higher annount of the wax. This high content of the wax greatly reduces the COF. I-lowe~er, as can be seen from EXAMPLE 1, the high content of wax does not adversely affect the blocking characteristics, haze or gloss of the material. ~lus, there is provided by the present invention coating compositions which when applied to a thernloplastic film have much lower COIs yet have good blocking charac~eristics, good haze and goo~l gloss characteristics. In addition, when the coated film of the present invention is laminated with another material, s~ch as glassine, i-t maintains its low COF
and has good characteristics for use in form, fill and seal packaging machinery.
AND PLASTIC FILMS COArED r~-~REWIrH
THIS IIW ENTION relates to coating compositions; more particularly, this invention relates to coating compositions which when applied to plastics films result in film structures having low haze, non-blocking and consistently low coefficient of friction S (COF) for good machinability. The present invention also relates to coated plastics films and, to processes for applying the composition to a surface of the plastics film.
Polypropylene films are widely used in the packaging industry because of their superior physical properties, such as high stiffness, excellent~optical clarity, and good moisture barrier characteristics. However, unmodified polypropylene has the disadvantages of having a high inherent COF and film-to-film destructive blocking on storage. The COF characteristics of polypropylene and other thermoplastic films can be beneficially 1S modified by the inclusion in the polymer o fa~ty acid amides.
However, effectiveness of the amides relies upon their ability to migrate to the surface of the films; accordingly, the value of the COF is subject to wide variation depending upon the thermal history which the film experiences during shipping, storage, and certain converting processes. In addition, the presence of such amides on the film surfaces can adversely affect the film's appearance as manifested by an increase in haze, a decrease in gloss and the presence of streaks. The presence of SUC}I amides on the surface can also adversely affect the wettability and adhesion of solvent and water-based inks, coatings, and adhesives.
, -~ .
~F-52l2-L - 2 -It is also known to provide a multi-layer film comprisjng a comparatively thick base layer of an optically clear thermoplastic resin and a comparatively thin surface layer containing a finely divided inorganic material in a proportion sufficient thereby to impart anti-block characteristics and decrease film-to-film COF. The resulting film has non-blocking and improved slip characteristics which do no~ materially vary with thermal history and are obtained without any adverse of the effects on appearance, wetting and adhesion typically experienced with amide-modified films. However, when laminated to other films, for example glassine paper, such films exhibit significantly higher COF values and do not perform flawlessly on convention form, fill and seal machines.
This invention seeks to provide a coated plastics film in which the above-mentioned disadvantages are ameliorated.
In accordance with one aspect of this invention9 there is provided a coating composition, suitable for a plastics film, which composition comprises:
(i) a (meth)acrylic copolymer;
(ii) from 30 to 150~ by weight of (i) of a finely-divided wax;
~iii) from 5 to 25% by weight of ti) of a finely-divided solid comprising silica, diatomaceous earth, calciwn siLicate, clay, or a mixture thereof; and (iv) from O to 1% by weight of (i) of talc or silica gel4 This invention also provides a pIastics film having a coating on and adhered to at least one surface thereof, the coating comprising a composition as herein defined.
This invention further provides a process for the preparation of a coated plastics ilm as herein defined, which process comprises:
providing a coating composition as herein defined; and applying the coating material to a surface of a plastics film.
' ~3~.3 The present invention also provides the use of a coating composition as herein defined to provide laminatable film with low coefficient of friction.
The coating oomposition when applied to a suitabe substrate film has the improved properties of low haze, excellent non-blocking and a consistently low coefficient of friction. The film has these properties even when laminated to another film, such as glassine or a plastic film.
As used herein, the term "(meth)acrylic copolymer" means a copolymer comprising acrylic or methacrylic residues or acrylic and methacrylic residues.
The coating composition of the present invention is composed of a (meth)acrylic copolymer (i), a finely-divided wax (ii), a finely divided incrganic solid material (iii), and optionally, a small amount of either talc or Syloid (a proprietary silica gel) (iv).
The (meth)acrylic copolymer (i) suitably comprises a monoethylenically unsaturated carboxylic acid, preferably comprising acrylic acid~ methacrylic acid or a mixture thereof, and the neutral monomer suitably comprises an ester, preferably comprising an alkyl acrylate, an alkyl methacryla-te or a mixture thereoE. A particularly preferred acrylic copol~ner and its preparation is described in IJ S Patent No. 3,753,769.
It is preferred that the unsaturated carboxylic acid is present in the copolymer in the amount of 2 to 20 parts by weight, and the neutral monomer is present in the amount of 98 to 80 parts by weight.
The finely-divided wax (ii) may be a natural wax, such as paraffin wax, microcrystalline wax, beeswax, carnauba wax, japan wax or montan wax; or a synthetic wax, such as a hydrogenated castor oil, chlorinated hydrocarbon wax, or a long chain fatty acid amide. The wax is preEerably present in the amount of 30 to 60% by weight based on the total weight of the acrylic copolymer.
.
.
F-5212-L - 4 - ~3~3~ ;2 The finely-divided inorganic solid (iii) may comprise, as clay, bentonite. The talc or Syloid is present in the amount of 0 to 1~ by weight based on the total weight of the acrylic copolymer.
The coated plastics film of this invention is suitably a thermoplastics film, preferably a film comprising a polyolefin, especially polypropylene. Desirably, the film is oriented.
The coating composition of the present invention can be applied to the surface of a film material in any convenient and known manner, such as by gravure coating, roll coating, dipping, or spraying. However, it is preferable to apply it by a gravure coater which can be positioned between the machine direction ~MD) orienter and the transverse direction (TD) orienter in an extruding system for the film. Also, the surface of the film is preferably treated to ensure that the coating will be strongly adherent to the film. This treatment may be accomplished by employing known prior art techniques, such as film chlorination, that is, exposure of the film to gaseous chlorine; treatment with oxidizing agents such as chromic acid; hot air or steam treatment; or flame treatment.
However, a particularly desirable method of treatment has been found to be the so called electronic treatment which comprises exposing the film surEace to a high volta~e corona dischar~
while passing the fllln between a pair of spaced electrodes.
After electronic treatment of the substrate film surface, it may be coated with the coating composition of the present invention which coating will then exhibit a tendency to more strongly a&ere to the treated film surface.
It is possible to add the coating composition of the present invention onto the surface of the treated film substrate from a non-aqueous solution of the composition using, for example, various organic solvents such as alcohols, ketones, and esters. However, since the coating compositions of the present invention contain colloidal inorganic materials 3~
and since such materials are difficult to keep well dispersed in organic solvents, it is preferable that the coating compositions of the present invention be applied from aqueous media and preferably from an alkaline aqueous solution thereof The following Examples illustrate the invention.
EXAMPLE I
An aqueous coating dispersion was prepared in a 5 liter flask by mixing the following ingredients:
Parts by weight Deionized water 680 hcrylic Emulsion (33.5%) 1,300 Aqueous Ammonia (7.36%) 20 Ludox Silica Dispersion (20%) 218 Carnauba Wax Emulsion (20%) 784 Talc (5%) 87 The acrylic emulsion ws supplied by Valspar Corporation and was a copolymer of 51~5% methyl methacrylate, 44.5% methyl acrylate, and 4.0~ methylacrylic acid. The coating dispersion had a solids content of 20.7%, a P!`l of 8.0, and viscosity tBrookfield) of 20 centlpo;se.
The coating dispersion was placed in a gravure coater which had been installed between the MD orienter and the TD
orienter of a pilot scale film orienter.
Polypropylene resin (Fina 828) was extruded through a flat sheet die at 250C, cast onto a cooling drum and quenched at 30C. The sheet, about 30 mil thick, was reheated to 140C
and stretched 5 fold in the MD, then corona treated for improved surface wettability. When passing through the gravure coater, the MD oriented film web, now about 6 mil thick, was coated with the coating dispersion. The coated web was dried in pre-heat zones at 160C, then stretched 8 fold in the TD
orienter at 145C and annealed at 160C. The biaxially stretched film, measured 0.75 mil thick, was corona treated on the uncoated side to improve the wettability and adhesion of ink and adhesives that might be applied later on. The coated film had the following properties:
COF 0.15-0.40 Blocking 5g/inch Haze 2.5%
Gloss at 45 80 Coating Weight 0.1-0.4 mg/in2 A series of coating compositions were prepared in the same manner as described in EXA~LE 1. In these compositions, the weight percentage of the silica, wax, and talc were varied as shown in TABLE 1.
~ 'r~L~
¦ Sample ¦ Acrylic Silica l~ax ~ raTc ~P~~j 2 1 100 10 36 0.25 0.2~-3 1 100 10 ~0 0~25 0.21 ~ 100 10 40 1.0 0.27 100 10 45 0.25 0.18 6 1 100 10 ~5 1.0 0.20 7 1 100 10 50 1.0 0.19 i ~ I 100 20 50 1.0 0.23 1 9 t loo lo ss l.o 0.18 1 1 10 1 100 10 60 1.0 0.18 1 i _ The COF of each of these samples is shown in TABLE 1 and was measured from coated films with similar coating weights of about 0.2 mg/in2.
The control coating compositions shown in TABLE 2 were made under the same conditions as described in EXAMPLE 1:
I i TABLE 2 I Sample IAcrylic Silica l~iax Talc Com~ents i A : ¦: 100 40 9 0.1 Very hazy~film and unacceptable¦
l l COF (0.60) I B ¦ 100 10 9 0.25 Very clear film ¦
1 1 - but unacceptable CO~ (0.58) C I 100 10 18 0.25 Very clear film I
I f but unacceptablel I : I : COF (0.49) The composition of Sample A was a heat seal coating based on the coatings described in U.S. Patent ~o. 3,753,769.
_ The slip coated ~ilms obtained from EXAMPLE 1, hereinafter referred to as Sample 1, Samples 3, 4 and 8 of EXAMPLE 2, Sample B of E.XAMPLE 3, and two additional control Samples were extrusion laminated by means of a low density polyethylene adhesive to a 1.6 mil thick glassine paper and tested on Miro Pak Miramatic ~lodel L vertical form, fill and seal packaging ~achine and the results are given in TABL~ 3, ¦ Sample 7 COF ~ FOFC ~Ibs) 3 1 0.21 lg 1 4 1 0.20 20 : l 3Q I 8 1 0.13 1~ : 7 ¦ B ¦ 0.60 45 75 LCM-W ¦ O.21 34 410 LCM ¦ 0.20 20 .
Sample 75 LCM-W was a commercial slip film based on U.S.
Patent ~o. 4,618, 527, and Sample 410 LCM was a commercial slip film based on eracamide as a sole slip agent.
For practical commercial packaging applications, the force over the forming collar (FOFC should be less than 30 lbs.
for a supported film. Otherwise, the film will risk machine downtime because of machine jamming and high squeal noise.
Samples 1, 3, 4 and 8 made in accordance with the present invention all had FOFC values-well below 30 lbs. and therefore they can be used satisfactorily on the packaging machinery with high reliability.
It can be seen from EXAMPLES 1 and 2 that all of the coating compositions of the present invention had low COF.
When comparing the compositions of EXAMPLES 1 and 2 with those of the control compositions in EXAMPLE 3, which had much higher COFs, it can be seen that the compositions of the present invention contains a much higher annount of the wax. This high content of the wax greatly reduces the COF. I-lowe~er, as can be seen from EXAMPLE 1, the high content of wax does not adversely affect the blocking characteristics, haze or gloss of the material. ~lus, there is provided by the present invention coating compositions which when applied to a thernloplastic film have much lower COIs yet have good blocking charac~eristics, good haze and goo~l gloss characteristics. In addition, when the coated film of the present invention is laminated with another material, s~ch as glassine, i-t maintains its low COF
and has good characteristics for use in form, fill and seal packaging machinery.
Claims (14)
1. A coating composition, suitable for a plastics film, which composition comprises:
(i) a (meth)acrylic copolymer;
(ii) from 30 to 150% by weight of (i) of a finely-divided wax, (iii) from 5 to 25% by weight of (i) of a finely-divided solid comprising silica, diatomaceous earth, calcium silicate, clay or a mixture thereof; and (iv) from 0 to 1% by weight of (i) of talc or silica gel.
(i) a (meth)acrylic copolymer;
(ii) from 30 to 150% by weight of (i) of a finely-divided wax, (iii) from 5 to 25% by weight of (i) of a finely-divided solid comprising silica, diatomaceous earth, calcium silicate, clay or a mixture thereof; and (iv) from 0 to 1% by weight of (i) of talc or silica gel.
2. A coating composition according to claim 1, in which the (meth)acrylic copolymer comprises an -monoethylenically unsaturated carboxylic acid and a neutral monomer.
3. A coating composition according to claim 2, in which the unsaturated carboxylic acid is present in the copolymer in the amount of 2 to 20 parts by weight, and the neutral monomer is present in the amount of 98 to 80 parts by weight.
4. A coating composition according to claim 2 or 3 in which the unsaturated carboxylic acid comprises acrylic acid, methacrylic acid or a mixture thereof.
5 . A coating composition according to claim 2 in which the neutral monomer comprises an ester.
6. A coating composition according to claim 5 in which the ester comprises an alkyl acrylate, an alkyl methacrylate or a mixture thereof.
7. A coating composition according to claim 1 in which the wax is present in the amount of 30 to 60% by weight based on the total weight of the acrylic copolymer.
8. A coating composition according to claim 1 or 7 in which the wax comprises carnauba wax.
9. A coating composition according to claim 1 in which the inorgaic solid comprises silica.
10. A plastics film having a coating on and adhere1to at least one surface thereof, the coating comprising:
(i) a (meth)acrylic copolymer;
(ii) from 30 to 150% by weight of (i) of a finely-divided wax;
(iii) from 5 to 25% by weight of (i) of a finely-divided solid comprising silica, diatomaceous earth, calcium silicate, clay or a mixture thereof; and (iv) from 0 to 1% by weight of (i) of talc or silica gel.
(i) a (meth)acrylic copolymer;
(ii) from 30 to 150% by weight of (i) of a finely-divided wax;
(iii) from 5 to 25% by weight of (i) of a finely-divided solid comprising silica, diatomaceous earth, calcium silicate, clay or a mixture thereof; and (iv) from 0 to 1% by weight of (i) of talc or silica gel.
11. A coated plastics film according to claim 10 in which the film is a thermoplastic film
12. A coated plastics film according to claim 11 in which the film comprises a polyolefin.
13. A coated plastics film according to claim 12 in which the polyolefin comprises polypropylene.
14. A coated plastics film according to claim 10 in which the film is oriented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002009462A CA2009462A1 (en) | 1989-01-30 | 1990-02-07 | Low coefficient of friction material and plastic films coated therewith |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US30389789A | 1989-01-30 | 1989-01-30 | |
| CA002009462A CA2009462A1 (en) | 1989-01-30 | 1990-02-07 | Low coefficient of friction material and plastic films coated therewith |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2009462A1 true CA2009462A1 (en) | 1991-08-07 |
Family
ID=25673931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002009462A Abandoned CA2009462A1 (en) | 1989-01-30 | 1990-02-07 | Low coefficient of friction material and plastic films coated therewith |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2009462A1 (en) |
-
1990
- 1990-02-07 CA CA002009462A patent/CA2009462A1/en not_active Abandoned
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