LAMINATE FILM AND PACKAGING BAG USING SAME

• US 20170266934A1
• Filed: 08/21/2015
• Published: 09/21/2017
• Est. Priority Date: 08/22/2014
• Status: Active Grant

• Current Assignee: Mitsui Chemicals Incorporated (Mitsui Chemicals)
• Original Assignee: Mitsui Chemicals Incorporated (Mitsui Chemicals)
• Inventors: OKU, Tatsuya, ABE, Tomohiro, IKEDA, Satoshi, NODA, Kiminori, EGAWA, Makoto
• Granted Patent: US 10,639,871 B2
• Time in Patent Office: Days
• CPC Class Codes: B29C 48/0018 combined with shaping by orienting, stretching or shrinking, e.g. film blowing B29C48/0017 takes precedence
• CPC Class Codes: B29C 48/022 characterised by the choice of material
• CPC Class Codes: B29C 48/21 the layers being joined at their surfaces
• CPC Class Codes: B29C 48/49 using two or more extruders to feed one die or nozzle
• CPC Class Codes: B29C 55/005 characterised by the choice of materials
• CPC Class Codes: B29C 55/12 biaxial
• CPC Class Codes: B29C 71/04 by wave energy or particle radiation , e.g. for curing or vulcanising preformed articles during moulding, e.g. in a mould B29C35/08
• CPC Class Codes: B29K 2023/10 Polymers of propylene
• CPC Class Codes: B29L 2009/00 Layered products
• CPC Class Codes: B29L 2031/7129 open
• CPC Class Codes: B32B 2250/24 All layers being polymeric
• CPC Class Codes: B32B 2307/31 Heat sealable
• CPC Class Codes: B32B 2307/518 bi-axially
• CPC Class Codes: B32B 2307/73 Hydrophobic
• CPC Class Codes: B32B 2307/75 Printability
• CPC Class Codes: B32B 2439/06 Bags, sacks, sachets
• CPC Class Codes: B32B 2439/70 Food packaging
• CPC Class Codes: B32B 27/00 Layered products comprising a layer of synthetic resin fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/16 specially treated, e.g. irradiated
• CPC Class Codes: B32B 27/304 : comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• CPC Class Codes: B32B 27/306 : comprising vinyl acetate or vinyl alcohol (co)polymers
• CPC Class Codes: B32B 27/32 : comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/34 : comprising polyamides
• CPC Class Codes: B32B 27/36 : comprising polyesters
• CPC Class Codes: B32B 27/365 : comprising polycarbonates
• CPC Class Codes: B65D 65/40 : Applications of laminates for particular packaging purposes B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or
• CPC Class Codes: C08F 210/02 : Ethene
• CPC Class Codes: C08F 210/06 : Propene
• CPC Class Codes: C08F 210/08 : Butenes
• CPC Class Codes: C08F 210/16 : Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
• CPC Class Codes: C08F 2500/03 : Narrow molecular weight distribution, i.e. Mw/Mn < 3
• CPC Class Codes: C08F 2500/08 : Low density, i.e. < 0.91 g/cm3
• CPC Class Codes: C08F 2500/12 : Melt flow index or melt flow ratio
• CPC Class Codes: C08F 2500/26 : Use as polymer for film forming
• CPC Class Codes: C08F 2500/27 : Amount of comonomer in wt% or mol%
• CPC Class Codes: C08F 2500/34 : Melting point [Tm]
• CPC Class Codes: C08F 4/65912 : in combination with an organoaluminium compound
• CPC Class Codes: C08F 4/65927 : two cyclopentadienyl rings being mutually bridged
• CPC Class Codes: C08L 23/0815 : Copolymers of ethene with aliphatic 1-olefins
• CPC Class Codes: C08L 23/14 : Copolymers of propene C08L23/16 takes precedence
• CPC Class Codes: C09J 2301/304 : the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
• CPC Class Codes: C09J 2301/414 : presence of a copolymer
• CPC Class Codes: C09J 2409/00 : Presence of diene rubber
• CPC Class Codes: C09J 2423/04 : Presence of homo or copolymers of ethene
• CPC Class Codes: C09J 2423/10 : Presence of homo or copolymers of propene

Abstract

A laminate film (30) of the present invention includes a heat sealing layer (10) composed of a resin composition including, with respect to 20 to 95 parts by weight of a propylene-based polymer (A) having a melting point (Tm) of equal to or higher than 120° C. and equal to or lower than 170° C. as measured by differential scanning calorimetry (DSC), a total of 5 to 80 parts by weight of two or more kinds of copolymers selected from the group consisting of a propylene.1-butene copolymer (B) containing a unit derived from propylene in an amount of 51 to 95 mol % and a unit derived from 1-butene in an amount of 5 to 49 mol %, wherein the total of the unit derived from propylene and the unit derived from 1-butene is 100 mol %, a copolymer (C) of ethylene and an α-olefin having 3 to 20 carbon atoms, and a copolymer (D) of 1-butene and an α-olefin having 3 carbon atoms or 5 to 20 carbon atoms containing a constitutional unit derived from 1-butene in an amount of 50 to 99 mol % and a constitutional unit derived from an α-olefin having 3 carbon atoms or 5 to 20 carbon atoms in an amount of 1 to 50 mol %, wherein the total of the unit derived from 1-butene and the unit derived from the α-olefin is 100 mol %, wherein each of Component (B), Component (C), and Component (D) does not correspond to Component (A), and the total amount of Component (A), Component (B), Component (C), and Component (D) is 100 parts by weight, and a base layer (20), in which a surface of the heat sealing layer (10) opposite to the base layer (20) has a wet tension of 32 to 45 mN/m.

Claims

1. A laminate film comprising:

a heat sealing layer composed of a resin composition including,

with respect to 20 to 95 parts by weight of a propylene-based polymer (A) having a melting point (Tm) of equal to or higher than 120°

C. and equal to or lower than 170°

C. as measured by differential scanning calorimetry (DSC),

a total of 5 to 80 parts by weight of two or more kinds of copolymers selected from the group consisting of

a propylene.1-butene copolymer (B) containing a unit derived from propylene in an amount of 51 to 95 mol % and a unit derived from 1-butene in an amount of 5 to 49 mol %, wherein the total of the unit derived from propylene and the unit derived from 1-butene is 100 mol %,

a copolymer (C) of ethylene and an α

-olefin having 3 to 20 carbon atoms, and

a copolymer (D) of 1-butene and an α

-olefin having 3 carbon atoms or 5 to 20 carbon atoms containing a constitutional unit derived from 1-butene in an amount of 50 to 99 mol % and a constitutional unit derived from an α

-olefin having 3 carbon atoms or 5 to 20 carbon atoms in an amount of 1 to 50 mol %, wherein the total of the unit derived from 1-butene and the unit derived from the α

-olefin is 100 mol %,

wherein each of Component (B), Component (C), and Component (D) does not correspond to Component (A), and the total amount of Component (A), Component (B), Component (C), and Component (D) is 100 parts by weight; and

a base layer,

wherein a surface of the heat sealing layer opposite to the base layer has a wet tension of 32 to 45 mN/m.

2. The laminate film according to claim 1,

wherein the surface of the heat sealing layer is modified by a corona treatment.

3. The laminate film according to claim 1,

wherein two or more kinds of copolymers selected from the group consisting of the Component (B), the Component (C), and the Component (D) include the Component (B) as a required component, and the content of the Component (B) is 3 to 25 parts by weight, wherein the total amount of Component (A), Component (B), Component (C), and Component (D) is 100 parts by weight.

4. The laminate film according to claim 1,

wherein the copolymer (C) of ethylene and an α

-olefin having 3 to 20 carbon atoms contains a constitutional unit derived from ethylene in an amount of 50 to 99 mol % and a constitutional unit derived from an α

-olefin having 3 to 20 carbon atoms in an amount of 1 to 50 mol %, wherein the total of the unit derived from ethylene and the unit derived from the α

-olefin is 100 mol %.

5. The laminate film according to claim 1 which is not stretched.

6. The laminate film according to claim 1 which is biaxially stretched.

7. A packaging bag which is formed by fusing the heat sealing layers of the laminate films according to claim 1.

8. A laminate film comprising:

a heat sealing layer composed of a resin composition including,

with respect to 20 to 95 parts by weight of a propylene-based polymer (A) having a melting point (Tm) of equal to or higher than 120°

C. and equal to or lower than 170°

C. as measured by differential scanning calorimetry (DSC),

a total of 5 to 80 parts by weight of two or more kinds of copolymers selected from the group consisting of

a propylene.1-butene copolymer (B) containing a unit derived from propylene in an amount of 51 to 95 mol % and a unit derived from 1-butene in an amount of 5 to 49 mol %, wherein the total of the unit derived from propylene and the unit derived from 1-butene is 100 mol %,

a copolymer (C) of ethylene and an α

-olefin having 3 to 20 carbon atoms, and

a copolymer (D) of 1-butene and an α

-olefin having 3 carbon atoms or 5 to 20 carbon atoms containing a constitutional unit derived from 1-butene in an amount of 50 to 99 mol % and a constitutional unit derived from α

-olefin having 3 carbon atoms or 5 to 20 carbon atoms in an amount of 1 to 50 mol %, wherein the total of the unit derived from 1-butene and the unit derived from the α

-olefin is 100 mol %,

wherein each of Component (B), Component (C), and Component (D) does not correspond to Component (A), and the total amount of Component (A), Component (B), Component (C), and Component (D) is 100 parts by weight; and

a base layer,

wherein the heat sealing layer included in the laminate film is subjected to a modification treatment.

9. The laminate film according to claim 8,

wherein the surface of the heat sealing layer opposite to the base layer has a wet tension of 5 to 30 mN/m.