WO2002102593A1 - Paper like polymeric material - Google Patents
Paper like polymeric material Download PDFInfo
- Publication number
- WO2002102593A1 WO2002102593A1 PCT/ZA2002/000081 ZA0200081W WO02102593A1 WO 2002102593 A1 WO2002102593 A1 WO 2002102593A1 ZA 0200081 W ZA0200081 W ZA 0200081W WO 02102593 A1 WO02102593 A1 WO 02102593A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- calcium carbonate
- polymer
- paper
- percent
- Prior art date
Links
- 239000000463 material Substances 0.000 title description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 38
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 19
- 239000010410 layer Substances 0.000 claims description 13
- 229920000642 polymer Polymers 0.000 claims description 12
- 239000004606 Fillers/Extenders Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000012792 core layer Substances 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 2
- 235000013305 food Nutrition 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 239000008188 pellet Substances 0.000 claims description 2
- 229920002959 polymer blend Polymers 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims 3
- 239000004821 Contact adhesive Substances 0.000 claims 1
- 239000004698 Polyethylene Substances 0.000 claims 1
- 238000010411 cooking Methods 0.000 claims 1
- 230000008014 freezing Effects 0.000 claims 1
- 238000007710 freezing Methods 0.000 claims 1
- 239000012943 hotmelt Substances 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 238000002844 melting Methods 0.000 claims 1
- 238000013021 overheating Methods 0.000 claims 1
- -1 polyethylene Polymers 0.000 claims 1
- 229920000573 polyethylene Polymers 0.000 claims 1
- 238000010257 thawing Methods 0.000 claims 1
- 229920001903 high density polyethylene Polymers 0.000 abstract description 6
- 239000004700 high-density polyethylene Substances 0.000 abstract description 6
- 229920001179 medium density polyethylene Polymers 0.000 abstract description 2
- 239000004701 medium-density polyethylene Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 14
- 235000010216 calcium carbonate Nutrition 0.000 description 13
- 229920000092 linear low density polyethylene Polymers 0.000 description 2
- 239000004707 linear low-density polyethylene Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- 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
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
Definitions
- This invention relates to material with paper-like characteristics made from synthetic polymers.
- the environmental advantage will be apparent in that trees may be saved instead of used for paper manufacture.
- the by-products derived during the paper manufacture process impacts negatively on the environment.
- the product of the invention is recyclable and reusable, or may be disposed of without creating an environmentally dangerous or unpleasant waste product. It can also be safely incinerated without forming any noxious or unpleasant gases.
- a polymeric film which contains a polymer, or blend of polymers which provide adequate strength and flexibility for use as a paper substitute and which also contains an extender in finely divided form to provide a product which has a coefficient of friction similar to that of natural paper and which has a dead fold property similar to that of natural paper.
- the extender is calcium carbonate which should be easily dispersible in a molten polymeric medium such as the medium chosen for the present invention.
- a calcium carbonate product provided in the form of pellets in a polymeric binder which melts at operating temperatures allowing the calcium carbonate to disperse uniformly into the polymer or polymer blend is preferred.
- the calcium carbonate should be present in an amount of between about 10 percent and 50 percent of the mass of the polymer.
- the invention is preferably in the form of multilayer product which is formed by co-extrusion of two or more different compositions chosen for particular end uses of the product formed.
- High density polyethylene has been found to be a suitable polymeric material and when mixed with about 20 percent by mass of calcium carbonate, forms an excellent product which has the properties required.
- the upper limit of calcium carbonate is about 50 percent.
- the invention may be provided in multilayer constructions, one or both of the outer layers having a composition for the required paper like feel while the internal layers may have compositions to provide adhesion between adjacent layers, to provide strength and waterproofing and/or degree of air or vapour permeability. It has been found that the intermediate layer/s should contain the extender to certain degree because this ensures that the product will exhibit the dead fold property which polymer sheeting never does because of the inherent memory of the polymer. It seems that the extender, and in particular calcium carbonate at the correct percentage guarantees that this desirable property is achieved.
- the outside layers provide the desired properties if extruded from high density or medium density polyethylene (density between 0.94 and 0.96g/cm 3 ) while the interaiediate layers should have a certain amount of low density polyethylene and particularly linear low density polyethylene.
- the latter has a beneficial effect on the bonding of adjacent layers so that the blown coextrusion of the various layers is effectively carried out.
- a film or layer having about 60 percent of high density polyethylene and containing above 20 percent of calcium carbonate has a density of about 1.lg/cm 3 and is very similar in all respects to paper of the same of similar thickness, except that the layer or film of the invention is infinitely stronger than the paper equivalent.
- the coextrusion method involved may be predetermined to produce products having different colours front and back, or different feels - for example for certain types of packaging or bags (cement bags, dog food bags and others for example).
- One product of the invention may have a paper like feel on one side and a perfectly smooth feel on the other.
- a three layer product is prepared, the outer layers comprising 60 percent high density polyethylene and 20 to 30 percent calcium carbonate and the core layer comprising a blend of high density polyethylene and linear low density polyethylene with 20 percent of calcium carbonate.
- a film was obtained having the following parameters. TYPICAL VALUES BASED ON 50H ⁇ I FILM
- the films of the invention may be corona treated on either or both sides to a level of 40 Dyne which is ideally suited for printing and laminating. Due to its low water absorbency, solvent based inks are recommended for printing and it has been found that the quality of printing is excellent.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Laminated Bodies (AREA)
Abstract
A film is produced from high or medium density polyethylene containing dispersed calcium carbonate between 10 and 50 percent by mass to provide a film having properties the same as or similar to natural paper having regard to parameters such as dead fold, feel and rigidity or stiffness and also with superior strength.
Description
PAPER LIKE POLYMERIC MATERIAL
TECHNICAL FIELD OF THE INVENTION
This invention relates to material with paper-like characteristics made from synthetic polymers.
BACKGROUND ART
It would be advantageous to provide a product from polymeric material in order to combine the look, stiffness, feel and dead fold characteristics of paper with the strength, waterproofing, and other advantages of polymeric sheeting.
It is an object of the present invention to provide a strong polymeric sheet material which has a definite paper feel and which can be used to great advantage in many typical applications of paper, such as bags, wrapping, packaging, stationery, bookbinding material and many others.
In the replacement of paper by the product of the present invention, the environmental advantage will be apparent in that trees may be saved instead of used for paper manufacture. Furthermore, the by-products derived during the paper manufacture process impacts negatively on the environment. In addition, the product of the invention is recyclable and reusable, or may be disposed of without creating an environmentally dangerous or unpleasant waste product. It can also be safely incinerated without forming any noxious or unpleasant gases.
DISCLOSURE OF THE INVENTION
According to the invention in its broadest aspect a polymeric film is produced which contains a polymer, or blend of polymers which provide adequate strength and flexibility for use as a paper substitute and which also contains an extender in finely
divided form to provide a product which has a coefficient of friction similar to that of natural paper and which has a dead fold property similar to that of natural paper.
In a preferred form of the invention the extender is calcium carbonate which should be easily dispersible in a molten polymeric medium such as the medium chosen for the present invention. Thus, for example, a calcium carbonate product provided in the form of pellets in a polymeric binder which melts at operating temperatures allowing the calcium carbonate to disperse uniformly into the polymer or polymer blend is preferred.
It will, of course, be appreciated that many possible extenders may be used in the process of the present invention, but calcium carbonate has been found to be best substance for this purpose. The calcium carbonate should be present in an amount of between about 10 percent and 50 percent of the mass of the polymer.
One of the main considerations in the choice of extender is the particle size as this will have a great effect on the feel of the product which should not be too coarse, nor too smooth, otherwise it will not have the characteristic paper like feel.
The invention is preferably in the form of multilayer product which is formed by co-extrusion of two or more different compositions chosen for particular end uses of the product formed.
High density polyethylene has been found to be a suitable polymeric material and when mixed with about 20 percent by mass of calcium carbonate, forms an excellent product which has the properties required. The upper limit of calcium carbonate is about 50 percent.
As mentioned above the invention may be provided in multilayer constructions, one or both of the outer layers having a composition for the required paper like feel while the internal layers may have compositions to provide adhesion between adjacent layers, to provide strength and waterproofing and/or degree of air or vapour permeability.
It has been found that the intermediate layer/s should contain the extender to certain degree because this ensures that the product will exhibit the dead fold property which polymer sheeting never does because of the inherent memory of the polymer. It seems that the extender, and in particular calcium carbonate at the correct percentage guarantees that this desirable property is achieved.
It has been found that the outside layers provide the desired properties if extruded from high density or medium density polyethylene (density between 0.94 and 0.96g/cm3) while the interaiediate layers should have a certain amount of low density polyethylene and particularly linear low density polyethylene. The latter has a beneficial effect on the bonding of adjacent layers so that the blown coextrusion of the various layers is effectively carried out.
It has been found that a film or layer having about 60 percent of high density polyethylene and containing above 20 percent of calcium carbonate has a density of about 1.lg/cm3 and is very similar in all respects to paper of the same of similar thickness, except that the layer or film of the invention is infinitely stronger than the paper equivalent.
It will be appreciated that the coextrusion method involved may be predetermined to produce products having different colours front and back, or different feels - for example for certain types of packaging or bags (cement bags, dog food bags and others for example). One product of the invention may have a paper like feel on one side and a perfectly smooth feel on the other.
Ϊ , In a particular example of the invention a three layer product is prepared, the outer layers comprising 60 percent high density polyethylene and 20 to 30 percent calcium carbonate and the core layer comprising a blend of high density polyethylene and linear low density polyethylene with 20 percent of calcium carbonate.
In an example of the invention a film was obtained having the following parameters.
TYPICAL VALUES BASED ON 50HΠI FILM
Variations of the coefficent of friction with increasing amounts of calcium carbonate are shown in the following Table
% CaCO3 vs C.O.F
Other parameters of films according to the invention of increasing thickness are shown in the following Table
Paperlike Films Analysis
The films of the invention may be corona treated on either or both sides to a level of 40 Dyne which is ideally suited for printing and laminating. Due to its low water absorbency, solvent based inks are recommended for printing and it has been found that the quality of printing is excellent.
Claims
1. A polymeric film characterised in that it contains a polymer, or blend of polymers which provide adequate strength stiffness and flexibility for use as a paper substitute and which also contains an extender in finely divided form to provide a product which has a coefficient of friction similar to that of natural paper and which has a dead fold property similar to that of natural paper.
2. The film according to claim 1 characterised in that the extender is calcium carbonate which is dispersible in the polymer according to claim 1.
3. The film according to claim 2 characterised in that the calcium carbonate is in the form of pellets in a polymeric binder which melts at operating temperatures allowing the calcium carbonate to disperse uniformly into the polymer or polymer blend is preferred.
4. The film according to claim 2 or claim 3 characterised in that the calcium carbonate is present in an amount of between about 10 percent and 50 percent of the mass of the polymer.
Ϊ ,
5. The film according to any of the above claims characterised in that the polymer is high density or medium density having a density between 0.94 and 0.96 without the extender.
6. A multilayer construction Including at least one layer of a film according to any of the above claims.
7. A multilayer construction according to claim 6 characterised in that a core layer comprises a film of low density linear or non-linear polyethylene; or a blend thereof.
8. A multilayer construction according to claim 6 or claim 7 characterised in that a core layer includes between 10 and 50 percent by mass of calcium carbonate.
However, the product is not recommend for processes involving long exposure to temperatures above 60 degrees C. But is it suitable for heat sealing and can be used in most FFS (form, fill, seal) applications. Continuously heated jaws may pose a problem in stop-start operations due to the film overheating and melting. Seals may be formed in a broad spectrum of sealing temperatures (100 to 150 degrees C) provided the dwell time and jaw pressure is minimal. The film may shrink at higher temperatures but the films have proved successful in sealing operations using hot melts and cold contact adhesives.
The films are not recommended for microwave cooking but can be used for defrosting food products in a microwave oven.
No problems have been encountered when the films are used for deep freezing operations.
In view of the great strength characteristics of the films of the invention it may be necessary to make adjustments to cutting apparatus and blades.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA200105030 | 2001-06-20 | ||
| ZA2001/5030 | 2001-06-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2002102593A1 true WO2002102593A1 (en) | 2002-12-27 |
Family
ID=25589204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/ZA2002/000081 WO2002102593A1 (en) | 2001-06-20 | 2002-05-17 | Paper like polymeric material |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2002102593A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007015120A1 (en) | 2005-08-04 | 2007-02-08 | Alfonso Alejandro Pira | Synthetic paper |
| WO2009026245A1 (en) * | 2007-08-18 | 2009-02-26 | Earth First Industries Incorporated | Flexible packaging composites |
| EP2556955A1 (en) * | 2011-08-09 | 2013-02-13 | Orbita-Film GmbH | Bitumen oil barrier |
| US8889047B2 (en) | 2010-01-12 | 2014-11-18 | Greenrock, Ltd. | Paper-like film and process for making it |
| DE202014007536U1 (en) * | 2014-05-12 | 2015-08-20 | Pryvatne Pidpryemstvo "Aventin" | Polymer film as food packaging |
| DE202014007537U1 (en) * | 2014-05-12 | 2015-08-20 | Pryvatne Pidpryemstvo "Aventin" | Heat-sealed polymeric packaging material |
| US9637866B2 (en) | 2013-03-14 | 2017-05-02 | Smart Planet Technologies, Inc. | Repulpable and recyclable composite packaging articles and related methods |
| US10633799B2 (en) | 2013-03-14 | 2020-04-28 | Smart Planet Technologies, Inc. | Composite structures for packaging articles and related methods |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1534128A (en) * | 1976-10-14 | 1978-11-29 | Wacker Chemie Gmbh | Manufacture of filled high-density polyethylene films |
| JPS61195837A (en) * | 1985-02-25 | 1986-08-30 | 三菱油化株式会社 | laminated polypropylene film |
| WO1994006849A1 (en) * | 1992-09-17 | 1994-03-31 | Dupont Canada Inc. | Paper-like film and method and compositions for making it |
| EP0773094A1 (en) * | 1995-11-16 | 1997-05-14 | Nan Ya Plastics Corporation | Synthetic paper and method for its manufacture |
| GB2327904A (en) * | 1997-08-01 | 1999-02-10 | Bp Chem Int Ltd | Polymer composites |
| WO1999058336A1 (en) * | 1998-05-08 | 1999-11-18 | Glopak Inc. | Paper like sheet of plastic material |
-
2002
- 2002-05-17 WO PCT/ZA2002/000081 patent/WO2002102593A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1534128A (en) * | 1976-10-14 | 1978-11-29 | Wacker Chemie Gmbh | Manufacture of filled high-density polyethylene films |
| JPS61195837A (en) * | 1985-02-25 | 1986-08-30 | 三菱油化株式会社 | laminated polypropylene film |
| WO1994006849A1 (en) * | 1992-09-17 | 1994-03-31 | Dupont Canada Inc. | Paper-like film and method and compositions for making it |
| EP0773094A1 (en) * | 1995-11-16 | 1997-05-14 | Nan Ya Plastics Corporation | Synthetic paper and method for its manufacture |
| GB2327904A (en) * | 1997-08-01 | 1999-02-10 | Bp Chem Int Ltd | Polymer composites |
| WO1999058336A1 (en) * | 1998-05-08 | 1999-11-18 | Glopak Inc. | Paper like sheet of plastic material |
Non-Patent Citations (1)
| Title |
|---|
| DATABASE WPI Derwent World Patents Index; AN 1992-091233 * |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007015120A1 (en) | 2005-08-04 | 2007-02-08 | Alfonso Alejandro Pira | Synthetic paper |
| WO2009026245A1 (en) * | 2007-08-18 | 2009-02-26 | Earth First Industries Incorporated | Flexible packaging composites |
| CN101827706A (en) * | 2007-08-18 | 2010-09-08 | 智能星球技术公司 | Flexible packaging composites |
| JP2010536677A (en) * | 2007-08-18 | 2010-12-02 | スマート プラネット テクノロジーズ インコーポレーテッド | Flexible packaging composite material |
| EP2191965A3 (en) * | 2007-08-18 | 2012-03-21 | Smart Planet Technologies, Inc. | Flexible packaging composites |
| US8569411B2 (en) | 2007-08-18 | 2013-10-29 | Smart Planet Technologies, Inc. | Flexible packaging composites |
| US9346238B2 (en) | 2007-08-18 | 2016-05-24 | Smart Planet Technologies, Inc. | Flexible packaging composites |
| US9676131B2 (en) | 2010-01-12 | 2017-06-13 | Greenrock, Ltd. | Paper-like film and process for making it |
| US8889047B2 (en) | 2010-01-12 | 2014-11-18 | Greenrock, Ltd. | Paper-like film and process for making it |
| US10766180B2 (en) | 2010-01-12 | 2020-09-08 | Greenrock, Ltd. | Paper-like film and process for making it |
| US10011063B2 (en) | 2010-01-12 | 2018-07-03 | Greenrock, Ltd. | Paper-like film and method for making it |
| EP2556955A1 (en) * | 2011-08-09 | 2013-02-13 | Orbita-Film GmbH | Bitumen oil barrier |
| US9637866B2 (en) | 2013-03-14 | 2017-05-02 | Smart Planet Technologies, Inc. | Repulpable and recyclable composite packaging articles and related methods |
| US10421848B2 (en) | 2013-03-14 | 2019-09-24 | Smart Planet Technologies, Inc. | Repulpable and recyclable composite packaging articles and related methods |
| US10633799B2 (en) | 2013-03-14 | 2020-04-28 | Smart Planet Technologies, Inc. | Composite structures for packaging articles and related methods |
| US10822468B2 (en) | 2013-03-14 | 2020-11-03 | Smart Planet Technologies, Inc. | Repulpable and recyclable composite packaging articles and related methods |
| US11466138B2 (en) | 2013-03-14 | 2022-10-11 | Smart Planet Technologies, Inc. | Repulpable and recyclable composite packaging articles and related methods |
| US11479916B2 (en) | 2013-03-14 | 2022-10-25 | Smart Planet Technologies, Inc. | Composite structures for packaging articles and related methods |
| DE202014007537U1 (en) * | 2014-05-12 | 2015-08-20 | Pryvatne Pidpryemstvo "Aventin" | Heat-sealed polymeric packaging material |
| DE202014007536U1 (en) * | 2014-05-12 | 2015-08-20 | Pryvatne Pidpryemstvo "Aventin" | Polymer film as food packaging |
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