CA1132951A - Coextruded laminar thermoplastic bags - Google Patents
Coextruded laminar thermoplastic bagsInfo
- Publication number
- CA1132951A CA1132951A CA346,625A CA346625A CA1132951A CA 1132951 A CA1132951 A CA 1132951A CA 346625 A CA346625 A CA 346625A CA 1132951 A CA1132951 A CA 1132951A
- Authority
- CA
- Canada
- Prior art keywords
- layer
- high density
- resin
- density polyethylene
- bag
- 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.)
- Expired
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
- B32B27/08—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 synthetic resin
-
- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/02—2 layers
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/72—Density
-
- 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
- B32B2323/046—LDPE, i.e. low density 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
- B32B2439/00—Containers; Receptacles
- B32B2439/40—Closed containers
- B32B2439/46—Bags
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
- Y10T428/31913—Monoolefin polymer
Abstract
Abstract:
A thermoplastic bag particularly adapted for the containment and storage of food comprising a laminar bag structure having an interior layer of a high density polyethylene and an exterior layer of polycaprolactam. The layer are lightly bonded together at their interface. Such bag structures are suitable for the containment of foodstuffs while they are being heated or reheated following storage.
A thermoplastic bag particularly adapted for the containment and storage of food comprising a laminar bag structure having an interior layer of a high density polyethylene and an exterior layer of polycaprolactam. The layer are lightly bonded together at their interface. Such bag structures are suitable for the containment of foodstuffs while they are being heated or reheated following storage.
Description
3Z9 ~ F-0085 Coextruded_Laminar Thermoplastic Bags The present invention relates to thermoplastic bag structures which have been fabricated from a thermoplastic ~ilm laminate cornprising two layers of film which are formed from dissimilar thermoplastic resins.
In the past, polyethylene bags have been used for food storage and, in particular, refrigerated food storage. Such food container bags are particularly convenient for the storage of food left-overs which may be intended for later reheating. The bulk of such food storage bags have been formed from low density, i.e. 0.91 to about 0.93 g/cc., polyethylene. For reheating purposes, foodstuffs must be removed from such low density polyethylene bags because of their tendency to partially melt and adhere to the surfaces of cooking vessels at ternperatures on the order of 100C and below.
To remedy this deficiency of low density polyethylene bags, attempts have been made to employ polyester bags, such as polyethylene terephthalate, for such elevated temperature applications as "boil" bags, however such films are difficult to seal and more importantly are prohibitively expensive for such disposable bag applications.
It has been known in the past that laminar film for food packaging may be formed from a laminate of a polyamide resin such as nylon and polyethylene provided that an adhesive inner layer is providsd between the polyethylene and the polyamide resin. Such a construction involves a three layer structure and as such presents manufacturing difficulties including the employment of three separa~e extruders in a manufacturing operation to produce a single film. Such triple layer laminations are disclosed in the October 197B
issue of Plastics Engineering, pages 53 et seq.
1P~
; - . , ~ .~ .
': ' ' 1132g~1 The present invention provides for an econornical thermo-plastic bag which may be employed to contain foods during storage and, most importantly, may be used to contain such foods during reheating preparatory to serving. The bag structures of the present invention comprise a two layer laminar structure, the inner bag layer, or that surface layer in contact with the foodstuffs, being formed from a mixture of high density polyethylene with a density of fr~nabout .930 up to about .96g/cc, and preferably a high density polyethylene-olefin oopolymer, and an adhesion prcm~ting resin. The outer layer of the bag laminate, or that surfaoe of the bag which comes into direct oontact with the oookin~ or reheating vessel, comprises a ply of a polyamide resin film preferably a reIatively ~ n film of a caprolactam ~olymer such as nylon 6. me outer polyamide, e.g. caprDlactam, polymer film layer ; 15 maintains the inner, more thermally susceptible, polyethylene layer out of contact with the surfaces of the coo~ing vessel and hence improves the bag's ability to withstand higher temperatures. The caprolactam polymer layer, having a -melting or sticking temperature on the order of above 210C.J
is stable and will not stick to the vessel side walls while foodstuffs are being reheated therein. Obviously the bag containing foodstuffs is intended to be immersed in a fluid such as water during the reheating operation.
Accordingly the present invention provides laminar bags for the storage and containment of foodstuffs which may sub-sequently be reheated without first removing them from the bag. In a specific embodiment of the present invention the bag is constructed from a two-ply laminate comprising an inner film layer of a high density polyethylene or a high density ethylene-olefin copolymer blended with a small percentage of an ionomer resin adhesion promoter in an amount on the order of from about 5% to 25% by weight and an outer layer of caprolactam polymer film adhered thereto.
The ionomer resin adhesion promoter is a copolymer of ethylene .
.
~ ,"~ ~
_ .. _ ~ . . _ __. ._ . . . _. . ~--_ . . .
.
, ` 113Z951 and up to 20~ by weight of methacrylic aci~ wherein at least 10% of the carboxylic acid groups are neutralized by a zinc metal ion. This resin is identified by the manufacturer as ~Surlyn 1650~ (TM). The high density ethylene copolymer preferably comprises ethylene which has been copolymerized with a minor amount, on the order of less than 10%, of another olefin such as an ~-olefin having from about 3 up to about 10 carbon atoms, for example octene-l.
A tubular thermoplastic laminate was prepared utilizing conventional blown tubular film coextrusion techniques whereby the final inner-tube layer comprised a 22.9 ~m thick layer of a mixture of high density polyethylene-octene copolymer with 10% of an ionomer resin, identified by the 15 manufacturer as'~urlyn 1650"(TM) and a 2.5 ~m thick outer layer of polycaprolactam. The continuous laminar tube was subsequently converted into bag structures utilizing tech-niques well known in the prior art. The high density polyethylene copolymer component of the inner layer was a copolymer of ethylene and about 3% by weight of octene-l.
This resin is identified by the manufacturer as~Alathon 7810 (TM) and has the following typical physical properties for a 31.8 ~m film extruded at a 4.3/1 blow-up ratio:
Density .945 g/cc Melt Index .25 g/10 min.
Tensile Yield (MD)20684 kPa (TD) 21374 kPa 30Elongation (MD) 660 (50.8mrn/min.) (TD) 730~
Secant Modulus(MD)551,580 kPa (TD) 565 370 kPa Elmendorf Tear (MD) 1.8 gM/~m , 11~29Sl .
(TD) 9.7 gm/~m Spencer Impact .012 Nm/~m Dart Drop ~660.4 mm) 4.5 gm/~m Tear Propagation (MD) 3.2 Kg force ASTM D-2582 ~TD) 3.7 Rg force The second mixture component of the inner layer was an ionomer resin identified by the manufacturer as "Surlyn 1650"
- (TM) and has the following typical average physical properties for a 25.4 ~m blown film extruded at a 2:1 blow-up ratio:
Film Properties Property Value ASTM Test Density .95 g/cc D792-66 Melt Index 1.4 g/10 min D1238-65T
Tensile strength 27580 kPa D882-67 Tensile yield 12410 kPa D882-67 20 Elongation 450% D882-67 Elmendorf Tear 3.1/3.5 g/~m D1922-67 Dart Drop (660.4 Inm) 11.8 g/~m D1709-67 Resin Properties Property Value ~ ASTM Test Density 0.939 gm/cc D-1505-68 Melt Flow Index 4.4 decigm/min D-1238-65T
30 Tensile strength 19650 kPa D-638-67 Yield strength 12890 kPa D-638-67 Elongation 580% D-638-67 ,',~;'~.
: : ~ .
. . ::
113Z95~
Ionomer resins, well known in the art, may be characterized as a metal-containing ionic copolymer obtained by the reaction between ethylene or an alpha-olefin with an ethylenically unsaturated monocarboxylic acid such as acrylic or methacrylic acid wherein at least 10% of said carboxylic acid groups are neutralized by an alkali metal ion. Such ionomer resins are disclosed in U.S. Patent ~lo. 3,496,061.
The polycaprolactam outer layer was fabricated from resin 10 identified by the manufacturer as CAPRON 8207 (TM) which has the following typical physical properties:
Density 1.13 g/cc Tensile, Yield 81.350 kPa (ASTM-P-638) Deflection Temperature 60C (ASTM-D-648 at 1820 kPa stress The two ply laminated film comprising lightly adhered layers of the high density ethylene-octene-l copolymer-ionomer 20 mixture and the polycaprolactam outer layer had the following physical properties:
Film Gauge 25.4~m Blow-up Ratio 4/1 Tensile, Ultimate (MD) 56330 kPa (TD) 30,340 kPa Tensile, Yield (MD) 19305 kPa (TD) 20684 kPa Elongation (MD) 560%
(TD) 480%
; Tear-Elmendorf (MD) 1.1 gms/~m (TD) 17.3 gms/~m !
.. . .
,, ,, .
. ' '' ~ , .
.
' :
, ' ' :
-~13Z~Sl For purposes of the present invention the thickness of the inner high density polyethylene copolymer layer may vary from about 12.7um up to about 76.2um and is preferably 22.9~m thick. The outer polycaprolactam layer may vary from about 1.3~m up to about 76.2~m in thickness and is preferably about 2.5~m thick.
Although the adhesive promoting resin disclosed in the foregoing specific example for blending with high density polyethylene was an ionomer, other adhesive resins may be employed to the present invention. An adhesive resin may be defined as a resin which has active sites that, when blended with the high density polyethylene resin, will enhance adhesion of the high density polyethylene to another film layer such as polycaprolactam. Additionally the adhesive resin must be compatible for blending with the high density polyethylene resin. Adhesion promoting resins which may be employed for blending with the high density polyethylene include resins such as vinyl acetate copolymers, ethylene acrylic acid copolymers or resins comprising a reaction product of a polyolefin, maleic anhydride and Na2CO3 as disclosed in Japanese Patent No. 78/60,946 and identified by the m nufdctu~er as PleKar - 2~ (TM~.
.-, : : , .
.
~ ~ :
:: , .~ :~
In the past, polyethylene bags have been used for food storage and, in particular, refrigerated food storage. Such food container bags are particularly convenient for the storage of food left-overs which may be intended for later reheating. The bulk of such food storage bags have been formed from low density, i.e. 0.91 to about 0.93 g/cc., polyethylene. For reheating purposes, foodstuffs must be removed from such low density polyethylene bags because of their tendency to partially melt and adhere to the surfaces of cooking vessels at ternperatures on the order of 100C and below.
To remedy this deficiency of low density polyethylene bags, attempts have been made to employ polyester bags, such as polyethylene terephthalate, for such elevated temperature applications as "boil" bags, however such films are difficult to seal and more importantly are prohibitively expensive for such disposable bag applications.
It has been known in the past that laminar film for food packaging may be formed from a laminate of a polyamide resin such as nylon and polyethylene provided that an adhesive inner layer is providsd between the polyethylene and the polyamide resin. Such a construction involves a three layer structure and as such presents manufacturing difficulties including the employment of three separa~e extruders in a manufacturing operation to produce a single film. Such triple layer laminations are disclosed in the October 197B
issue of Plastics Engineering, pages 53 et seq.
1P~
; - . , ~ .~ .
': ' ' 1132g~1 The present invention provides for an econornical thermo-plastic bag which may be employed to contain foods during storage and, most importantly, may be used to contain such foods during reheating preparatory to serving. The bag structures of the present invention comprise a two layer laminar structure, the inner bag layer, or that surface layer in contact with the foodstuffs, being formed from a mixture of high density polyethylene with a density of fr~nabout .930 up to about .96g/cc, and preferably a high density polyethylene-olefin oopolymer, and an adhesion prcm~ting resin. The outer layer of the bag laminate, or that surfaoe of the bag which comes into direct oontact with the oookin~ or reheating vessel, comprises a ply of a polyamide resin film preferably a reIatively ~ n film of a caprolactam ~olymer such as nylon 6. me outer polyamide, e.g. caprDlactam, polymer film layer ; 15 maintains the inner, more thermally susceptible, polyethylene layer out of contact with the surfaces of the coo~ing vessel and hence improves the bag's ability to withstand higher temperatures. The caprolactam polymer layer, having a -melting or sticking temperature on the order of above 210C.J
is stable and will not stick to the vessel side walls while foodstuffs are being reheated therein. Obviously the bag containing foodstuffs is intended to be immersed in a fluid such as water during the reheating operation.
Accordingly the present invention provides laminar bags for the storage and containment of foodstuffs which may sub-sequently be reheated without first removing them from the bag. In a specific embodiment of the present invention the bag is constructed from a two-ply laminate comprising an inner film layer of a high density polyethylene or a high density ethylene-olefin copolymer blended with a small percentage of an ionomer resin adhesion promoter in an amount on the order of from about 5% to 25% by weight and an outer layer of caprolactam polymer film adhered thereto.
The ionomer resin adhesion promoter is a copolymer of ethylene .
.
~ ,"~ ~
_ .. _ ~ . . _ __. ._ . . . _. . ~--_ . . .
.
, ` 113Z951 and up to 20~ by weight of methacrylic aci~ wherein at least 10% of the carboxylic acid groups are neutralized by a zinc metal ion. This resin is identified by the manufacturer as ~Surlyn 1650~ (TM). The high density ethylene copolymer preferably comprises ethylene which has been copolymerized with a minor amount, on the order of less than 10%, of another olefin such as an ~-olefin having from about 3 up to about 10 carbon atoms, for example octene-l.
A tubular thermoplastic laminate was prepared utilizing conventional blown tubular film coextrusion techniques whereby the final inner-tube layer comprised a 22.9 ~m thick layer of a mixture of high density polyethylene-octene copolymer with 10% of an ionomer resin, identified by the 15 manufacturer as'~urlyn 1650"(TM) and a 2.5 ~m thick outer layer of polycaprolactam. The continuous laminar tube was subsequently converted into bag structures utilizing tech-niques well known in the prior art. The high density polyethylene copolymer component of the inner layer was a copolymer of ethylene and about 3% by weight of octene-l.
This resin is identified by the manufacturer as~Alathon 7810 (TM) and has the following typical physical properties for a 31.8 ~m film extruded at a 4.3/1 blow-up ratio:
Density .945 g/cc Melt Index .25 g/10 min.
Tensile Yield (MD)20684 kPa (TD) 21374 kPa 30Elongation (MD) 660 (50.8mrn/min.) (TD) 730~
Secant Modulus(MD)551,580 kPa (TD) 565 370 kPa Elmendorf Tear (MD) 1.8 gM/~m , 11~29Sl .
(TD) 9.7 gm/~m Spencer Impact .012 Nm/~m Dart Drop ~660.4 mm) 4.5 gm/~m Tear Propagation (MD) 3.2 Kg force ASTM D-2582 ~TD) 3.7 Rg force The second mixture component of the inner layer was an ionomer resin identified by the manufacturer as "Surlyn 1650"
- (TM) and has the following typical average physical properties for a 25.4 ~m blown film extruded at a 2:1 blow-up ratio:
Film Properties Property Value ASTM Test Density .95 g/cc D792-66 Melt Index 1.4 g/10 min D1238-65T
Tensile strength 27580 kPa D882-67 Tensile yield 12410 kPa D882-67 20 Elongation 450% D882-67 Elmendorf Tear 3.1/3.5 g/~m D1922-67 Dart Drop (660.4 Inm) 11.8 g/~m D1709-67 Resin Properties Property Value ~ ASTM Test Density 0.939 gm/cc D-1505-68 Melt Flow Index 4.4 decigm/min D-1238-65T
30 Tensile strength 19650 kPa D-638-67 Yield strength 12890 kPa D-638-67 Elongation 580% D-638-67 ,',~;'~.
: : ~ .
. . ::
113Z95~
Ionomer resins, well known in the art, may be characterized as a metal-containing ionic copolymer obtained by the reaction between ethylene or an alpha-olefin with an ethylenically unsaturated monocarboxylic acid such as acrylic or methacrylic acid wherein at least 10% of said carboxylic acid groups are neutralized by an alkali metal ion. Such ionomer resins are disclosed in U.S. Patent ~lo. 3,496,061.
The polycaprolactam outer layer was fabricated from resin 10 identified by the manufacturer as CAPRON 8207 (TM) which has the following typical physical properties:
Density 1.13 g/cc Tensile, Yield 81.350 kPa (ASTM-P-638) Deflection Temperature 60C (ASTM-D-648 at 1820 kPa stress The two ply laminated film comprising lightly adhered layers of the high density ethylene-octene-l copolymer-ionomer 20 mixture and the polycaprolactam outer layer had the following physical properties:
Film Gauge 25.4~m Blow-up Ratio 4/1 Tensile, Ultimate (MD) 56330 kPa (TD) 30,340 kPa Tensile, Yield (MD) 19305 kPa (TD) 20684 kPa Elongation (MD) 560%
(TD) 480%
; Tear-Elmendorf (MD) 1.1 gms/~m (TD) 17.3 gms/~m !
.. . .
,, ,, .
. ' '' ~ , .
.
' :
, ' ' :
-~13Z~Sl For purposes of the present invention the thickness of the inner high density polyethylene copolymer layer may vary from about 12.7um up to about 76.2um and is preferably 22.9~m thick. The outer polycaprolactam layer may vary from about 1.3~m up to about 76.2~m in thickness and is preferably about 2.5~m thick.
Although the adhesive promoting resin disclosed in the foregoing specific example for blending with high density polyethylene was an ionomer, other adhesive resins may be employed to the present invention. An adhesive resin may be defined as a resin which has active sites that, when blended with the high density polyethylene resin, will enhance adhesion of the high density polyethylene to another film layer such as polycaprolactam. Additionally the adhesive resin must be compatible for blending with the high density polyethylene resin. Adhesion promoting resins which may be employed for blending with the high density polyethylene include resins such as vinyl acetate copolymers, ethylene acrylic acid copolymers or resins comprising a reaction product of a polyolefin, maleic anhydride and Na2CO3 as disclosed in Japanese Patent No. 78/60,946 and identified by the m nufdctu~er as PleKar - 2~ (TM~.
.-, : : , .
.
~ ~ :
:: , .~ :~
Claims (5)
1. A two-layer thermoplastic laminer bag construction comprising an outer layer of a polyamide resin film and an inner film layer of a mixture of a high density polyethylene-olefin copolymer and an adhesion promoting resin.
2. A laminar bag construction in accordance with claim 1, wherein said high density polyethylene-olefin copolymer comprises ethylene copolymerized with less than 10% by weight of an alpha-olefin having 3 to 10 carbon atoms.
3. A laminar bag construction in accordance with claim 2, wherein said alpha-olefin is octene-1.
4. A bag construction in accordance with any one of claims 1 to 3, wherein said adhesion promoting resin comprises about 10% by weight of an ionomer resin based upon the total weight of said inner film layer.
5. A bag construction in accordance with claim 1 which consists of a two-layer laminate comprising an outer film layer of polycaprolactam or nylon-6 and an inner film layer of a mixture of a high density polyethylene-olefin copolymer, having a density of from about 0.930 to about 0.960 g/cc and from about 5% to about 25% by weight of an adhesion promoting resin.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/019,546 US4220684A (en) | 1979-03-12 | 1979-03-12 | Coextruded laminar thermoplastic bags |
| US019,546 | 1979-03-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1132951A true CA1132951A (en) | 1982-10-05 |
Family
ID=21793791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA346,625A Expired CA1132951A (en) | 1979-03-12 | 1980-02-28 | Coextruded laminar thermoplastic bags |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4220684A (en) |
| EP (1) | EP0015775B1 (en) |
| CA (1) | CA1132951A (en) |
| DE (1) | DE3060687D1 (en) |
| ES (1) | ES489405A0 (en) |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4401256A (en) * | 1981-12-10 | 1983-08-30 | Mobil Oil Corporation | Laminar thermoplastic films, bags thereof |
| US4488924A (en) * | 1981-12-10 | 1984-12-18 | Mobil Oil Corporation | Method of sealing laminar thermoplastic films and bags |
| DE3218415A1 (en) * | 1982-05-15 | 1983-11-24 | Karl-Heinz Dr. 4802 Halle Sengewald | BAG FOR INFUSION SOLUTIONS OR THE LIKE |
| GB8405587D0 (en) * | 1984-03-02 | 1984-04-04 | British United Shoe Machinery | Shoe stiffener |
| US4837088A (en) * | 1985-02-05 | 1989-06-06 | Avery International Corporation | Coextruded core laminates |
| EP0198128A3 (en) * | 1985-04-17 | 1990-10-10 | Akzo N.V. | Flexible bag for transporting bulk materials |
| US4762737A (en) * | 1985-05-07 | 1988-08-09 | Mobil Oil Corporation | Multi-layer non-corrosive plastic film |
| EP0344373A1 (en) * | 1988-06-03 | 1989-12-06 | Mobil Oil Corporation | Multi-layer non-corrosive plastic film |
| IT231279Y1 (en) * | 1993-10-13 | 1999-08-02 | Abate Luigi | TUBULAR ELEMENT FOR THE FORMATION OF BAGS FOR THE PACKAGING OF VACUUM PRODUCTS |
| US6964798B2 (en) | 1993-11-16 | 2005-11-15 | Baxter International Inc. | Multi-layered polymer based thin film structure for medical grade products |
| US5753895A (en) * | 1996-01-16 | 1998-05-19 | Golden Valley Microwave Foods, Inc. | Microwave popcorn package with adhesive pattern |
| US20040122414A9 (en) * | 1997-09-22 | 2004-06-24 | Hurst William S. | Contoured tubing closure |
| US6083587A (en) | 1997-09-22 | 2000-07-04 | Baxter International Inc. | Multilayered polymer structure for medical products |
| US20020187694A1 (en) * | 2001-06-11 | 2002-12-12 | Brighton Thomas B. | Mesh reinforced breathable plastic film |
| US7019271B2 (en) | 2002-02-08 | 2006-03-28 | Graphic Packaging International, Inc. | Insulating microwave interactive packaging |
| US7323669B2 (en) | 2002-02-08 | 2008-01-29 | Graphic Packaging International, Inc. | Microwave interactive flexible packaging |
| JP4327205B2 (en) | 2004-02-09 | 2009-09-09 | グラフィック パッケージング インターナショナル インコーポレイテッド | Microwave cooking package |
| EP1763575A4 (en) | 2004-04-27 | 2009-09-23 | Baxter Int | Stirred-tank reactor system |
| EP2018333B1 (en) | 2006-05-12 | 2019-09-18 | Graphic Packaging International, LLC | Microwave energy interactive heating sheet |
| US9073689B2 (en) | 2007-02-15 | 2015-07-07 | Graphic Packaging International, Inc. | Microwave energy interactive insulating structure |
| CA2729600C (en) * | 2008-07-14 | 2014-06-10 | Graphic Packaging International, Inc. | Cooking package |
| AU2015258191B2 (en) | 2014-11-19 | 2020-02-27 | Flexopack S.A. | Oven skin packaging process |
| US10604325B2 (en) | 2016-06-03 | 2020-03-31 | Graphic Packaging International, Llc | Microwave packaging material |
| EP3501822A1 (en) | 2017-12-22 | 2019-06-26 | Flexopack S.A. | Fibc liner film |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA924232A (en) * | 1968-12-12 | 1973-04-10 | Goldman Max | Laminar structures and packages thereof and method of manufacture |
| US3791915A (en) * | 1971-07-06 | 1974-02-12 | American Can Co | Multilayer laminated polyethylene copolymer-polyamide film |
| US3997383A (en) * | 1975-03-10 | 1976-12-14 | W. R. Grace & Co. | Cross-linked amide/olefin polymeric laminates |
| US4151318A (en) * | 1976-06-21 | 1979-04-24 | Mobil Oil Corporation | Laminar thermoplastic film constructions |
| US4225373A (en) * | 1976-12-22 | 1980-09-30 | W. R. Grace & Co. | Sealing cross-linked thermoplastic materials |
-
1979
- 1979-03-12 US US06/019,546 patent/US4220684A/en not_active Expired - Lifetime
-
1980
- 1980-02-28 CA CA346,625A patent/CA1132951A/en not_active Expired
- 1980-03-11 DE DE8080300741T patent/DE3060687D1/en not_active Expired
- 1980-03-11 ES ES489405A patent/ES489405A0/en active Granted
- 1980-03-11 EP EP80300741A patent/EP0015775B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0015775A1 (en) | 1980-09-17 |
| ES8104057A1 (en) | 1981-04-16 |
| EP0015775B1 (en) | 1982-07-28 |
| DE3060687D1 (en) | 1982-09-16 |
| ES489405A0 (en) | 1981-04-16 |
| US4220684A (en) | 1980-09-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |