US4565743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Package materials for bundle-wrapping unit cases
Assignee: Fujifilm Holdings Corp
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Filing: 1984-02-08
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Granted: 1986-01-21
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Expires: 2004-02-08
Abstract
Abstract Moisture-proof polypropylene film package materials for packaging unit cases in lots, especially for photographic roll film small cases, comprising: (a) a biaxially-stretched polypropylene film substrate having, (i) stretching of 2 to 15 times, (ii) the thermal contraction both in longitudinal and transverse directions of 2-8%, and (iii) the relative ratio of thermal contraction in both directions of 40% or less, (b) polyvinylidene chloride resin coating applied onto at least one surface of the film substrate, and (c) an antistatic agent incorporated in at least one of layers.
Inventors
- 👤 Mutsuo Akao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:30
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/044; C08J7/048; C08J7/052; C08J2323/00; C08J2323/02; C08J2323/10; C08J2427/00; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31935
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
93 words
A package material for wrapping unit cases in a bundle which comprises: (a) a biaxially-stretched polypropylene film substrate having a stretching magnification of 2-15 times, coefficients of the thermal contraction both in the longitudinal and transverse directions of 2-8%, and a relative ratio of the coefficients of the thermal contraction in the longitudinal and transverse directions of 40% or less; (b) polyvinylidene chloride resin coating applied onto at least one surface of the polypropylene film substrate; and (c) an antistatic agent incorporated in at least one of the layers constituting the package material.
Claim 2
Dependent Claim
93 words
A package material for wrapping unit cases in a bundle which comprises: (a) a biaxially-stretched polypropylene film substrate having a stretching magnification of 2-15 times, coefficients of the thermal contraction both in the longitudinal and transverse directions of 2-8%, and a relative ratio of the coefficients of the thermal contraction in the longitudinal and transverse directions of 40% or less; (b) polyvinylidene chloride resin coating applied onto at least one surface of the polypropylene film substrate; and (c) an antistatic agent incorporated in at least one of the layers constituting the package material.
Claim 3
Dependent Claim
18 words
The package material as defined in claim 1, wherein the polypropylene film substrate is a crystalline isotactic polypropylene.
Claim 4
Dependent Claim
32 words
The package material as defined in claim 1, wherein the polypropylene film substrate is a polypropylene copolymer with α-olefins having 2-10 carbon atoms, the content of α-olefins not exceeding 50 wt %.
Claim 5
Dependent Claim
28 words
The package material as defined in claim 1, wherein the polypropylene film substrate contains not more than 30 wt % of an ethylene polymer blended with the polypropylene.
Claim 6
Dependent Claim
14 words
The package material as defined in claim 4, wherein said ethylene polymer is polyethylene.
Claim 7
Dependent Claim
23 words
The package material as defined in claim 1, wherein the polyvinylidene chloride resin coating contains 60 mol % or more of vinylidene chloride.
Claim 8
Dependent Claim
22 words
The package material as defined in claim 1, wherein the polyvinylidene chloride resin coating includes a monolayer coating or a multilayer coating.
Claim 9
Dependent Claim
33 words
The package material as defined in claim 7, wherein said polyvinylidene chloride resin coating includes a multilayer coating comprised of a polyvinylidene copolymer with an unsaturated monocarboxylic acid or an unsaturated dicarboxylic acid.
Claim 10
Dependent Claim
22 words
The package material as defined in claim 1, wherein the antistatic agent is present in an amount of approximately 0.1-1 wt %.
Claim 11
Dependent Claim
17 words
The package material as defined in claim 1, wherein the film substrate is approximately 10-30 microns thick.
Claim 12
Dependent Claim
19 words
The package material as defined in claim 1, wherein the polyvinylidene chloride resin coating is approximately 0.5-3 microns thick.
Claim 13
Dependent Claim
30 words
The package material is defined in claim 1, wherein at least one acrylic copolymer resin layer is further formed on at least one surface of the polyvinylidene chloride resin coating.
Claim 14
Dependent Claim
36 words
The package material as defined in claim 1, wherein at least one of the outer layers constituting the package material contains at least one additive selected from the group consisting of anti-blocking agents, lubricants and plasticizers.
Claim 15
Dependent Claim
17 words
The package material as defined in claim 1, wherein the coefficient of the thermal contraction is 3-6%.
Claim 16
Dependent Claim
25 words
The package material as defined in claim 1, wherein the relative ratio of the coefficients of the contraction in both directions is 20% or less.
Claim 17
Dependent Claim
27 words
The package material as defined in claim 3, wherein the α-olefins includes one or more selected from the group consisting of ethylene, 1-butene, 1-octene, 1-hexene, and 4-methylpentene-1.
Claim 18
Dependent Claim
33 words
The package material as defined in claim 4, wherein the ethylene polymer includes one or more selected from the copolymers of ethylene with vinyl acetate (EVA), ethyl acrylate (EEA) and methyl acrylate (EMA).
Claim 19
Dependent Claim
32 words
The package materials as defined in claim 6, wherein the balance of polyvinylidene chloride resin coating includes one or more of polyvinylidene copolymers with acrylic ester, methacrylic ester, acrylonitrile, and vinyl chloride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |