US4399181A
Expired / Lapsed
US
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Cold drawn high-orientation multilayered film and process for manufacture of said film
Assignee: Asahi Kasei Corp
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Filing: 1981-11-30
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Granted: 1983-08-16
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Expires: 2001-11-30
Abstract
Abstract A high-orientation multilayered film incorporates at least one cold drawn, highly oriented resin layer excellent in mechanical strength and suitable mainly for use as packaging material. Because of its specific stratal construction which is highly adaptable to afford a wide variety of specific functions, the composite film is suitable for manufacture of thermally shrinkable films which excel in transparency and in ability to shrink rapidly particularly at low temperatures. Also disclosed is a process for drawing at specific low temperatures at high expansion ratios the aforementioned multiplicity of resin layers either all by themselves or in conjunction with layers of other resins by utilizing the cold drawability of the aforementioned resin layers excelling in mechanical strength.
Inventors
- 👤 Isao Yoshimura
- 👤 Osamu Mizukami
- 👤 Hideo Hata
- 👤 Junichi Kageyama
- 👤 Takashi Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:21
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C55/00; B29C55/02; B29C55/023; B32B27/30; B32B27/304; B32B27/306; B32B27/308; B32B27/32; C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/08; B29K2023/083; B29K2096/00; B29K2096/005; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/54; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2323/00; B32B2323/04; B32B2323/10; B32B2331/00; B32B2331/04; B32B2439/00; B32B2553/00; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/26; Y10T428/269; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/31786; Y10T428/31797; Y10T428/31801; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
251 words
A cold drawn high-orientation multilayered film, having a tensile strength of not less than 5.0 g/mm 2 , the principal component layers of said film being highly oriented, said multilayer film comprising at least one layer preponderantly comprising a cold-drawable resin selected from the group consisting of blended and unblended specific polymers, [1] (B)+(A)+(C), [2] (B)+(A), [3] (B)+(C), [4] (D), and [5] (E), wherein, (A) is at least one ethylene type polymer selected from the group consisting of copolymers of ethylene with another monomer selected from the group consisting of vinyl esters, aliphatic unsaturated carboxylic acids and alkyl esters of said carboxylic acids, ionically crosslinked resins derived from said copolymers and low-density polymers of ethylene, (B) is a soft copolymer elastomer having a Vicat softening point of not more than 60° C. (C) is at least one polymer selected from the group consisting of crystalline polypropylene, high-density polyethylene, crystalline polybutene-1, and polymethyl pentene-1, (D) is a crystalline polybutene-1 having a concentration of 50 to 100% by weight, and (E) is an ionically crosslinked resin, said multilayered film consisting of at least one cold drawable resin layer (CDR 1-3 ) preponderantly containing at least one cold drawable resin selected from the group consisting of blended polymers [1], [2], and [3], and at least one cold drawable resin layer (CDR 4 ) preponderantly containing a polymer [4], and said film having a multilayer construction represented by the layer combination of (I) CDR 1-3 /CDR 4 or CDR 1-3 /CDR 4 /CDR 1-3 .
Claim 2
Dependent Claim
251 words
A cold drawn high-orientation multilayered film, having a tensile strength of not less than 5.0 g/mm 2 , the principal component layers of said film being highly oriented, said multilayer film comprising at least one layer preponderantly comprising a cold-drawable resin selected from the group consisting of blended and unblended specific polymers, [1] (B)+(A)+(C), [2] (B)+(A), [3] (B)+(C), [4] (D), and [5] (E), wherein, (A) is at least one ethylene type polymer selected from the group consisting of copolymers of ethylene with another monomer selected from the group consisting of vinyl esters, aliphatic unsaturated carboxylic acids and alkyl esters of said carboxylic acids, ionically crosslinked resins derived from said copolymers and low-density polymers of ethylene, (B) is a soft copolymer elastomer having a Vicat softening point of not more than 60° C. (C) is at least one polymer selected from the group consisting of crystalline polypropylene, high-density polyethylene, crystalline polybutene-1, and polymethyl pentene-1, (D) is a crystalline polybutene-1 having a concentration of 50 to 100% by weight, and (E) is an ionically crosslinked resin, said multilayered film consisting of at least one cold drawable resin layer (CDR 1-3 ) preponderantly containing at least one cold drawable resin selected from the group consisting of blended polymers [1], [2], and [3], and at least one cold drawable resin layer (CDR 4 ) preponderantly containing a polymer [4], and said film having a multilayer construction represented by the layer combination of (I) CDR 1-3 /CDR 4 or CDR 1-3 /CDR 4 /CDR 1-3 .
Claim 3
Dependent Claim
43 words
The multilayered film according to claim 1, wherein the polymer (A) of the blended specific polymers [1] and [2] is at least one member selected from the group consisting of ethylene-vinylacetate copolymer, ethylene-acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylate copolymer and ethylene-methacrylic acid copolymer.
Claim 4
Dependent Claim
48 words
The multlayered film according to claim 1 or 2, wherein the polymer (A) of the blended specific polymers [1] and [2] is an ethylene-vinyl acetate copolymer containing 1 to 13 mol% of vinyl acetate group and having a melt index within the range of from 0.2 to 10.
Claim 5
Dependent Claim
80 words
The multilayered film according to claim 1, wherein the polymer (A) of the blended specific polymers [1] and [2] is an ionically crosslinked resin which is a copolymer of ethylene and aliphatic unsaturated carboxylic acid, the carboxyl group of said copolymer being at least partially ionized with metal, and said ionically crosslinked resin is obtained by at least partially saponifying an aliphatic unsaturated alkyl carboxylate and then subjecting the product of saponification to at least partial ionic bonding with metal
Claim 6
Dependent Claim
31 words
The multilayered film according to claim 1, wherein the polymer (B) of the blended specific polymers [1], [2] and [3] is a copolymer elastomer containing 90 to 20 mol% of ethylene.
Claim 7
Dependent Claim
31 words
The multilayered film according to claim 1, wherein the polymer (B) of the blended specific polymers [1], [2] and [3] is a copolymer elastomer containing 88 to 40 mol% of ethylene.
Claim 8
Dependent Claim
65 words
The multilayered film according to claim 1, wherein the polymer (B) of the blended specific polymers [1], [2] and [3] is a soft copolymer comprising ethylene and at least one member selected from the group consisting of α-olefins of 3 to 12 carbon atoms and possessing a Vicat softening point of not more than 50° C. and a crystallization degree of not more than 30%.
Claim 9
Dependent Claim
41 words
The multilayered film according to claim 1 or 7, wherein the copolymer elastomer of the polymer (B) of the blended specific polymers [1], [2] and [3] is a copolymer of ethylene with an α-olefin and a small amount of a polyene.
Claim 10
Dependent Claim
36 words
The multilayered film according to claim 8, wherein the copolymer elastomer is a copolymer containing not more than 5 mol% of a non-conjugated diene selected from the group consisting of polyenes, hexadiene, pentadiene and norbornene derivatives.
Claim 11
Dependent Claim
39 words
The multilayered film according to claim 7, wherein the polymer (B) of the blended specific polymers [1], [2] and [3] is a random copolymer whose α-olefin component is one member selected from the group consisting of propylene and butene-1.
Claim 12
Dependent Claim
34 words
The multilayered film according to claim 1, wherein the polymer (C) of the blended specific polymers [1] and [3] is a rigid polymer having a Vicat softening point of not less than 100° C.
Claim 13
Dependent Claim
35 words
The multilayered film according to claim 1, wherein the polymer (C) of the blended polymers [1] and [3] is a crystalline polypropylene containing 0 to 7 mol% of ethylene or other α-olefin as a modifier.
Claim 14
Dependent Claim
58 words
The multilayered film according to claim 1, wherein the cold-drawable resin of the specific polymer [1] has a composition such as to satisfy the relations of 0.90≧B/(A+B)≧0.05 and 2.0≧C/(A+B)≧0.05, that of the specific polymer [2] a composition to satisfy the relation of 0.90≧B/(A+B)≧0.05, and that of the specific polymer [3] a composition to satisfy the relation of 0.90≧B/(B+C)≧0.30.
Claim 15
Dependent Claim
60 words
The multilayered film according to claim 1 or 13, wherein the cold-drawable resin of the specific polymer [1] has a composition such as to satisfy the relations of 0.70≧B/(A+B)≧0.07 and 1.0≧C/(A+B)≧0.10, that of the specific polymer [2] a composition to satisfy the relation of 0.70≧B/(A+B)≧0.07, and that of the specific polymer [3] a composition to satisfy the relation of 0.87≧B/(B+C)≧0.40.
Claim 16
Dependent Claim
20 words
The multilayered film according to claim 1, wherein the film contains at least one layer formed of the polymer [1].
Claim 17
Dependent Claim
41 words
The multilayered film according to claim 1, wherein the specific polymer [4] is included and is a polymer containing not less than 85 mol% of a butene-1 component and having a melt index within the range of from 0.1 to 20.
Claim 18
Dependent Claim
29 words
The multilayered film according to claim 1, wherein there is a layer formed of the specific polymer [4] and it contains at least 80% by weight of crystalline polybutene-1.
Claim 19
Dependent Claim
87 words
The multilayered film according to claim 1, wherein there is a layer formed predominantly of the specific polymer [5] which contains 50 to 100% by weight of an ionically crosslinked resin which is a copolymer of ethylene and aliphatic unsaturated carboxylic acid, the carboxyl group of said copolymer being at least partially ionized with metal, and said ionically crosslinked resin is obtained by at least partially saponifying an aliphatic unsaturated alkyl carboxylate and then subjecting the product of saponification to at least partial ionic bonding with metal.
Claim 20
Dependent Claim
40 words
The multilayered film according to claim 1 wherein there is a layer formed of blended polymers selected from the group consisting of blended specific polymers [1], [2] and [3] which contains at least 50% by weight of the blended polymers.
Claim 21
Dependent Claim
44 words
The multilayered film according to claim 1, wherein the layer formed of the cold-drawable resin selected from the group of blended and unblended specific polymers [1] through [5] inclusive has a thickness accounting for at least 20% of the total thickness of the film.
Claim 22
Dependent Claim
32 words
The multilayered film according to claim 1 or 20, wherein the layer formed of the cold-drawable resin has a thickness accounting for at least 50% of the total thickness of the film.
Claim 23
Dependent Claim
66 words
The multilayered film according to claim 1, wherein there is a cold-drawable resin selected from the group consisting of blended and unblended specific polymers [1], [2], [3] and [5] which is treated with an activated energy ray to an extent such as to contain 0 to 50% by weight of an insoluble gel in boiling xylene and possess a melt index of not more than 0.5.
Claim 24
Dependent Claim
54 words
The multilayered film according to claim 1, wherein the component layers of the film excepting the layer containing the cold-drawable resin include at least one layer formed of at least one polymer selected from the group consisting of crystalline polypropylene, polyethylene, ethylene-vinyl acetate copolymer, ethylene-aliphatic unsaturated carboxylic acid copolymers and ethylene-aliphatic unsaturated carboxylate copolymers.
Claim 25
Dependent Claim
62 words
The multilayered film according to claim 1, wherein the component layers of the film excepting the layer containing the cold-drawable resin includes, as the adhesive layer, at least one layer formed of one member selected from the group consisting of ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer elastomers, ethylene-aliphatic unsaturated carboxylic acid copolymers and derivatives thereof, and block-copolymerized elastomers of styrene-conjugated diene type monomers.
Claim 26
Dependent Claim
34 words
The multilayered film according to claim 1, wherein the layer containing the cold-drawable resin of the specific polymer [4] has deposited on at least one surface thereof a layer formed preponderantly of crystalline polypropylene.
Claim 27
Dependent Claim
36 words
The multilayered film according to claim 1 or 25, wherein the film is composed of at least three layers including, as the intermediate layer, the layer containing the cold drawable resin of the specific polymer [4].
Claim 28
Dependent Claim
48 words
The multilayered film according to claim 1, wherein the film is composed of at least three layers including at least one inner layer formed of blended specific polymers selected from [1], [2], and [3] and at least one outer layer formed predominantly of the ionically crosslinked polymer [5].
Claim 29
Dependent Claim
29 words
The multilayered film according to claim 1, wherein the film has a tensile strength of not less than 7 Kg/mm 2 and an elongation of not less than 100%.
Claim 30
Dependent Claim
18 words
The multilayered film according to claim 1, wherein the film has a Haze of not more than 4.0%.
Claim 31
Dependent Claim
23 words
The multilayered film according to claim 1, wherein the film has a heat shrink tension of not less than 50 gr/mm 2 .
Claim 32
Dependent Claim
25 words
The multilayered film according to claim 1 or 30, wherein the film has a heat shrink tension of not less than 100 gr/mm 2 .
Claim 33
Dependent Claim
19 words
The multilayered film according to claim 1, wherein the film has a shrinkage gradient of not more than 2.0.
Claim 34
Dependent Claim
22 words
The multilayered film according to claim 1, wherein the temperature at the heat shrinkage of 20% is not more than 85° C.
References Cited (Backward Citations)
US4112181A
Cited
US3375126A
Cited
US3524795A
Cited
US3579416A
Cited
US3682767A
Cited
US3908070A
Cited
US3847728A
Cited
US4082877A
Cited
US4161562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |