EP0819058A1 - Compostible laminate - Google Patents

Compostible laminate

Info

Publication number
EP0819058A1
EP0819058A1 EP96908290A EP96908290A EP0819058A1 EP 0819058 A1 EP0819058 A1 EP 0819058A1 EP 96908290 A EP96908290 A EP 96908290A EP 96908290 A EP96908290 A EP 96908290A EP 0819058 A1 EP0819058 A1 EP 0819058A1
Authority
EP
European Patent Office
Prior art keywords
laminate
acid
layer
compostible
layers
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
EP96908290A
Other languages
German (de)
French (fr)
Inventor
Simon Dominic Waddington
James Henry Montador
Jurkka Tapani Kuusipalo
Hannu Tapani Karhuketo
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.)
United Paper Mills Ltd
Monsanto Co
Original Assignee
Yhtyneet Paperitehtaat Oy
United Paper Mills Ltd
Zeneca 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 FI951637A external-priority patent/FI951637A/en
Priority claimed from GBGB9507263.3A external-priority patent/GB9507263D0/en
Application filed by Yhtyneet Paperitehtaat Oy, United Paper Mills Ltd, Zeneca Ltd filed Critical Yhtyneet Paperitehtaat Oy
Publication of EP0819058A1 publication Critical patent/EP0819058A1/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • 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
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • 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
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • 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
    • 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
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • 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
    • B32B2317/00—Animal or vegetable based
    • B32B2317/12—Paper, e.g. cardboard
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene
    • 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/30—Polyamides; Polyimides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof

Definitions

  • THIS INVENTION relates to compostible laminates. Used packaging materials constitute a refuse disposal problem and it is desirable to be able to compost them. Also, in composting organic wastes, for example food or vegetation, it is convenient to transport the compostible material in a compostible container. Bags made of paper or other cellulosic material, for example cellulose film or boxes made of such materials, for example cardboard or the like may be used but are mechanically weak when wet.
  • This invention provides compostible laminates comprising cellulosic sheets, for example paper or board, of satisfactory strength which comprise substantially only compostible components and which comprise layers of a cellulose sheet, a polycaprolactone, a polylactic acid and/or a cellulose ester and a poly 3- or 4-hydroxy- alkanoic acid.
  • the invention preferably comprises a compostible laminate which comprises a cellulosic sheet directly coated on at least one surface with a layer of polycaprolactone, polylactic acid and/or a cellulose ester and a layer overlying the said directly coated layer of a poly 3 or 4-hydroxyalkanoic acid.
  • laminates according to the invention have acceptable wet strength and resistance to cracking. Resistance to cracking is important if the paper or board is folded as any cracking along the fold will allow access to moisture and impairment of the wet strength along the fold.
  • the invention also comprises a compostible laminate as aforesaid in which the polyhydroxyalkanoic acid layer is covered with a readily removable sacrificial layer of optionally non-compostible polymer, for example polythene or polypropylene.
  • a readily removable sacrificial layer of optionally non-compostible polymer, for example polythene or polypropylene.
  • the sacrificial layer is useful in improving the manufacture of the laminate, for example in preventing the sticking of the laminate to chill rolls in the course of manufacture. If desired it may be left in position to protect the laminate until it is to be used.
  • the added layers may be applied to the cellulosic sheet simultaneously using known techniques, for example by the use of a multi manifold co-extruder.
  • Temperatures of 150 to 300°C and preferably 150 to 250°C are suitably used for co-extrusion and polymers with melting points below the extrusion temperature should be used.
  • the laminate is suitably cooled for example to a temperature of 40 to 70 C C. This may be accomplished by contacting the laminate with a chill roller.
  • the total weight of the coating layers after stripping the sacrificial layer from the product should be about 5 to 40 grammes per square metre and is preferably 10-25 grammes per square metre.
  • the ratio of the polyhydroxyalkanoic acid to the polycapro- lactone, cellulose ester or polylactic acid layer may be 1:10 to 10:1 preferably 5:1 to 1:5 and more preferably 2:1 to 1:2 by weight
  • the polyhydroxyalkanoic acid may be a homo or co- polymer suitably of hydroxybutyric acid preferably together with hydroxyvaleric acid. Suitable polymers of this type are described in our European Patents EP 52459 and EP 69497.
  • the polyhydroxyalkanoic acid preferably has a molecular weight of 50,000 to 1 million and more preferably 100,000 to 800,000.
  • the polylactic acid, cellulose ester or polycaprolactone preferably has a molecular weight of at least 40,000 for example 30,000 to 500,000.
  • the sacrificial layer may after it is stripped from the laminate be reused in the manufacturing process if it is a thermo-plastic.
  • a pilot line was used for the following work which comprises a roll of 110g/m 2 brown Kraft paper feeding the paper to a unit for corona discharge onto the paper, a support roller supporting the paper emerging from the corona discharge chamber, a die for extruding three layers of polymer onto the paper beyond the support roller, a chill roller and a nip roller for pressing the laminate of paper and polymer together against the chill roller and a wind-up roller for collecting the laminate.
  • the corona discharge was at a power of approximately
  • the die was fed by three extruders supplying polycaprolactone (a commercial product sold as "Tone” 767 by Union Carbide, estimated number average molecular weight 43,000 melt flow index of 30 at 190°C) , a copolymer comprising 92% hydroxybutyric acid units and 8% hydroxyvaleric acid units in a D-configuration of estimated weight average molecular weight 480,000 sold under the trade name "BIOPOL” by ZENECA Limited and low density polyethylene sold by Borealis as grade NCPE 1515, MFI 15 at 190°C.
  • the die was a Cloeren vane flat die of width 350 mm with adjustable vanes and equipped with breaker plates and screen packs and using a CCABB configuration plug.
  • the chill roller was maintained at a temperature of 60°C.
  • the screw speeds in the preceding table are proportional to the approximate relative thickness of the layers.
  • Laminate from the wind-up roller was removed and any polyethylene layer stripped off.
  • the coat weight i.e. the total polymer remaining per square metre of laminate
  • Adhesion of the layers was tested by manual stripping of the deposited polymer layers from the paper. Cracking of the polymer layer was tested by folding the laminate over so that the polymer layer contacted the polymer layer, the direction of folding being transverse to the line processing direction or parallel to the line processing direction as the case may be, and also so that the paper layer contacted the paper layer in the transverse and parallel directions as aforesaid.
  • #20 and #10 are all 3 layer co extrusions with equal "BIOPOL" Polymer to PCL layers
  • #9 is a 3 layer co extrusion with a 9/4 ratio of "BIOPOL" Polymer to PCL
  • PCL polycaprolactone
  • Adhesion 1 Layers come apart easily and both materials remain completely intact.
  • Adhesion 2 Some force needed to separate the layers and materials damaged slightly.
  • Adhesion 3 More force needed to separate the layers and both materials damaged.
  • Adhesion 5 Layers impossible to pull apart, both tear immediately.

Landscapes

  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Polyesters Or Polycarbonates (AREA)

Abstract

A composite laminate which comprises layers of a cellulose sheet, a polycaprolactone, polylactic acid and/or a poly 3- or 4-hydroxyalkanoic acid is compostible and has acceptable wet strength and resistance to cracking.

Description

COMPOSTIBLE LAMINATE
THIS INVENTION relates to compostible laminates. Used packaging materials constitute a refuse disposal problem and it is desirable to be able to compost them. Also, in composting organic wastes, for example food or vegetation, it is convenient to transport the compostible material in a compostible container. Bags made of paper or other cellulosic material, for example cellulose film or boxes made of such materials, for example cardboard or the like may be used but are mechanically weak when wet.
This invention provides compostible laminates comprising cellulosic sheets, for example paper or board, of satisfactory strength which comprise substantially only compostible components and which comprise layers of a cellulose sheet, a polycaprolactone, a polylactic acid and/or a cellulose ester and a poly 3- or 4-hydroxy- alkanoic acid.
The invention preferably comprises a compostible laminate which comprises a cellulosic sheet directly coated on at least one surface with a layer of polycaprolactone, polylactic acid and/or a cellulose ester and a layer overlying the said directly coated layer of a poly 3 or 4-hydroxyalkanoic acid. We have found that laminates according to the invention have acceptable wet strength and resistance to cracking. Resistance to cracking is important if the paper or board is folded as any cracking along the fold will allow access to moisture and impairment of the wet strength along the fold. The invention also comprises a compostible laminate as aforesaid in which the polyhydroxyalkanoic acid layer is covered with a readily removable sacrificial layer of optionally non-compostible polymer, for example polythene or polypropylene. The sacrificial layer is useful in improving the manufacture of the laminate, for example in preventing the sticking of the laminate to chill rolls in the course of manufacture. If desired it may be left in position to protect the laminate until it is to be used. The added layers may be applied to the cellulosic sheet simultaneously using known techniques, for example by the use of a multi manifold co-extruder. Temperatures of 150 to 300°C and preferably 150 to 250°C are suitably used for co-extrusion and polymers with melting points below the extrusion temperature should be used. After application of the added layers the laminate is suitably cooled for example to a temperature of 40 to 70CC. This may be accomplished by contacting the laminate with a chill roller. It is preferred that the total weight of the coating layers after stripping the sacrificial layer from the product should be about 5 to 40 grammes per square metre and is preferably 10-25 grammes per square metre. The ratio of the polyhydroxyalkanoic acid to the polycapro- lactone, cellulose ester or polylactic acid layer may be 1:10 to 10:1 preferably 5:1 to 1:5 and more preferably 2:1 to 1:2 by weight
The polyhydroxyalkanoic acid may be a homo or co- polymer suitably of hydroxybutyric acid preferably together with hydroxyvaleric acid. Suitable polymers of this type are described in our European Patents EP 52459 and EP 69497. The polyhydroxyalkanoic acid preferably has a molecular weight of 50,000 to 1 million and more preferably 100,000 to 800,000. The polylactic acid, cellulose ester or polycaprolactone preferably has a molecular weight of at least 40,000 for example 30,000 to 500,000.
The sacrificial layer may after it is stripped from the laminate be reused in the manufacturing process if it is a thermo-plastic.
A pilot line was used for the following work which comprises a roll of 110g/m2 brown Kraft paper feeding the paper to a unit for corona discharge onto the paper, a support roller supporting the paper emerging from the corona discharge chamber, a die for extruding three layers of polymer onto the paper beyond the support roller, a chill roller and a nip roller for pressing the laminate of paper and polymer together against the chill roller and a wind-up roller for collecting the laminate. The corona discharge was at a power of approximately
1.5 kw over a width of 350 mm, the paper being run through the discharge at a rate of 15 to 75 m per minute.
The die was fed by three extruders supplying polycaprolactone (a commercial product sold as "Tone" 767 by Union Carbide, estimated number average molecular weight 43,000 melt flow index of 30 at 190°C) , a copolymer comprising 92% hydroxybutyric acid units and 8% hydroxyvaleric acid units in a D-configuration of estimated weight average molecular weight 480,000 sold under the trade name "BIOPOL" by ZENECA Limited and low density polyethylene sold by Borealis as grade NCPE 1515, MFI 15 at 190°C. The die was a Cloeren vane flat die of width 350 mm with adjustable vanes and equipped with breaker plates and screen packs and using a CCABB configuration plug.
This arrangement enabled the polymers to be extruded onto the paper in the order paper/polycaprolactone/- "BIOPOL" polyhydroxyalkanoate/polyethylene in the desired thicknesses set by the outputs from each extruder.
The chill roller was maintained at a temperature of 60°C.
The line was operated under the conditions shown below. For comparison a single layer consisting of "BIOPOL" polymer was coated onto the paper using only one of the extruders under the conditions shown below. The "Barrel Zone" temperatures indicate the successive increases in temperature in the barrel zones of the extruders which feed adaptors of the extruders which adjust the temperature of the polymer as shown. The temperature of the die itself was set at 185°C. Single Layer Extrueion
Sample Barrel Zones °C Adaptor Screw Line °C Speed speed 1 2 3 rpm m/min
#1 150 175 185 185 40 30
#2 150 175 185 185 40 20
#3 150 175 185 185 40 25 3 Layer Co-Extrusion
Sample Barrel Zones ° C Adap Screw Line
-tor speed speed
°C rpm m/min
1 2 3 4
#9 150 175 185 185 45 35
150 170 180 185 185 20
150 170 180 185 185 90
#10 150 175 185 185 32 35
150 170 185 185 185 32
150 170 185 185 185 90
#20 150 175 185 185 50 50
150 175 180 185 185 50
170 190 195 200 205 200
#21 150 175 185 185 50 75
150 170 180 185 185 50
170 190 195 200 205 200
The screw speeds in the preceding table are proportional to the approximate relative thickness of the layers.
The products were tested as follows:
Laminate from the wind-up roller was removed and any polyethylene layer stripped off. The coat weight (i.e. the total polymer remaining per square metre of laminate) was recorded.
Adhesion of the layers was tested by manual stripping of the deposited polymer layers from the paper. Cracking of the polymer layer was tested by folding the laminate over so that the polymer layer contacted the polymer layer, the direction of folding being transverse to the line processing direction or parallel to the line processing direction as the case may be, and also so that the paper layer contacted the paper layer in the transverse and parallel directions as aforesaid.
The integrity of the polymer coating after folding was tested by laying the laminate flat, applying coloured turpentine to the crease from the polymer side of the laminate and after 10 minutes measuring the proportion of the crease in which colouring on the paper side was observed. 10 cm lengths of crease were tested. The results are reported as follows:
Sample Coat Adhesion Turpentine (Line Direction) Turpentine (Traverse Direction)
Weight Number Substrate to Coating to Substrate to Coating to g/m2 Substrate Coating Substrate Coating (%) (%) (%) (%)
#1 15 0 60 80 90 50 #3 20.5 0 20 70 50 50 #2 28 0 0 0 0 0
#21 12.1 5 5 0 5 1 #20 14.4 5 1 3 5 1 #10 18.6 3 1 0 5 0 #9 21.0 2 1 0 5 0
10 #1, #2 and #3 all single layer extrusion coating
#21. #20 and #10 are all 3 layer co extrusions with equal "BIOPOL" Polymer to PCL layers
#9 is a 3 layer co extrusion with a 9/4 ratio of "BIOPOL" Polymer to PCL
PCL means polycaprolactone. Adhesion numbers are assessed as follows:
15
Adhesion 0 Layers not bonded at all and both materials remain completely intact.
Adhesion 1 Layers come apart easily and both materials remain completely intact.
Adhesion 2 Some force needed to separate the layers and materials damaged slightly.
Adhesion 3 More force needed to separate the layers and both materials damaged.
Adhesion 4 Layers difficult to pull apart and both damaged almost totally.
Adhesion 5 Layers impossible to pull apart, both tear immediately.

Claims

1 A laminate which comprises layers of a cellulosic sheet, a poly caprolactone, a polylactic acid and/or a cellulose ester and a poly 3- or 4-hydroxyalkanoic acid.
2 A laminate as claimed in Claim 1 in which the cellulosic sheet is paper or board.
3 A compostible laminate which comprises a cellulosic sheet directly coated on at least one surface with a layer of polycaprolactone, polylactic acid and/or a cellulose ester and a layer overlying the said directly coated layer of a poly 4- or 5- hydroxy- alkanoic acid.
4 A compostible laminate as claimed in any preceding claim in which the polyhydroxyalkanoic acid layer is covered with a readily removable sacrificial layer of optionally non-compostible polymer.
5 A laminate as claimed in Claim 4 in which the sacrificial layer is of polythene or polypropylene.
6 A laminate as claimed in any of Claims 1 to 5 in which the total weight of the layers other than the cellulosic sheet after stripping any sacrificial layer from the product is 4 to 40 grams per square metre.
7 A laminate as claimed in any preceding claim in which the ratio of the polyhydroxyalkanoic acid to polycaprolactone cellulose ester or polylactic acid is 1:10 to 10:1 by weight.
8 A laminate as claimed in any preceding claim in which the polyhydroxyalkanoic acid is a homo or copolymer of hydroxybutyric acid together with hydroxyvaleric acid. A laminate as claimed in Claim 8 in which the polyhydroxyalkanoic acid has a molecular weight of 100,000 to 800,000. A laminate as claimed in any preceding claim in which the polylactic acid cellulose ester or polycaprolactone has a molecular weight of at least 40,000. A process of making a laminate as claimed in any preceding claim in which the other layers are applied to the cellulosic sheet simultaneously. A process as claimed in Claim 11 in which temperatures of 150 to 300°C are used for coextrusion and in which the melting points of the polymers used are below the said extrusion temperature. A process as claimed in Claim 11 or 12 in which the laminate is cooled to a temperature of 40 to 70°C by contacting the laminate with a chill roll. A process as claimed in any of Claims 11 to 13 in which the sacrificial layer is stripped from the laminate and re-used in the manufacturing process.
EP96908290A 1995-04-06 1996-04-04 Compostible laminate Ceased EP0819058A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FI951637A FI951637A (en) 1995-04-06 1995-04-06 Packaging
FI951637 1995-04-06
GB9507263 1995-04-07
GBGB9507263.3A GB9507263D0 (en) 1995-04-07 1995-04-07 Compostible laminate
PCT/GB1996/000819 WO1996031347A1 (en) 1995-04-06 1996-04-04 Compostible laminate

Publications (1)

Publication Number Publication Date
EP0819058A1 true EP0819058A1 (en) 1998-01-21

Family

ID=26159944

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96908290A Ceased EP0819058A1 (en) 1995-04-06 1996-04-04 Compostible laminate

Country Status (5)

Country Link
EP (1) EP0819058A1 (en)
JP (1) JP2002503160A (en)
AU (1) AU5159896A (en)
CA (1) CA2217640A1 (en)
WO (1) WO1996031347A1 (en)

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CN102444056A (en) * 2010-10-12 2012-05-09 龙盟环保纸（集团）有限公司 Five-layer resolvable or degradable environmental friendly paper and production method thereof

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FI112624B (en) * 1998-07-07 2003-12-31 Enso Oyj Compostable coated paper or paperboard, process for its manufacture and products derived therefrom
CN1079408C (en) * 1998-10-12 2002-02-20 中国科学院广州化学研究所 Biodegradable polymer blended film and preparation method therefor
CN1104326C (en) * 1999-12-22 2003-04-02 平湖市比例包装材料有限公司 Composite material for packing food and its preparing process
EP1160379B2 (en) † 2000-05-31 2011-03-16 Oji Paper Co., Ltd. Paper for use in molding
GB0716456D0 (en) 2007-08-23 2007-10-03 Innovia Films Ltd Packaging article
US8637126B2 (en) 2006-02-06 2014-01-28 International Paper Co. Biodegradable paper-based laminate with oxygen and moisture barrier properties and method for making biodegradable paper-based laminate
US20090286090A1 (en) * 2008-05-19 2009-11-19 Ting Yuan-Ping R Enhance performance on current renewable film using functional polymer coatings
CN102400418A (en) * 2011-11-23 2012-04-04 成都东航塑胶有限公司 Waterproof packing paper

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US5409772A (en) * 1991-09-27 1995-04-25 Toppan Printing Co., Ltd. Composite laminate
JPH0664111A (en) * 1992-08-24 1994-03-08 Toppan Printing Co Ltd Paper vessel
IL107275A (en) * 1992-10-16 1997-07-13 Leonard Pearlstein Compostable paperboard container and method for the preparation thereof
JP2830680B2 (en) * 1993-03-25 1998-12-02 凸版印刷株式会社 Plastic paper containers
JPH06293113A (en) * 1993-04-08 1994-10-21 Toppan Printing Co Ltd Production of laminate

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102444056A (en) * 2010-10-12 2012-05-09 龙盟环保纸（集团）有限公司 Five-layer resolvable or degradable environmental friendly paper and production method thereof
CN102444056B (en) * 2010-10-12 2016-08-10 龙盟环保纸（集团）有限公司 Five layers of decomposable asymmetric choice net or the environment protecting paper of degraded and manufacture method thereof

Also Published As

Publication number Publication date
WO1996031347A1 (en) 1996-10-10
JP2002503160A (en) 2002-01-29
AU5159896A (en) 1996-10-23
CA2217640A1 (en) 1996-10-10

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