Patent US4493867A successfully refreshed from Google Patents.
US4493867A
Expired / Lapsed
US
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Stretch film for wrapping and a resin composition therefor
Assignee: Mitsubishi Chemical Corp
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Filing: 1982-03-16
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Granted: 1985-01-15
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Expires: 2002-03-16
Abstract
Abstract The stretch film useful for wrapping is described which comprises a resin composition composed of: (1) from about 90 to 99.6 wt % of a resin A selected from the group consisting of ethylene-vinyl acetate copolymer resin containing 5 to 25 wt % vinyl acetate and polybutadiene resin; (2) from about 0.2 to 5 wt % of a fatty acid ester B selected from the group consisting of sorbitan oleate and sorbitan laurate; and (3) from about 0.2 to 5 wt % of a fatty acid ester C selected from the group consisting of monoglycerin oleate, polyglycerin oleate, glyceryl triricinoleate, and glyceryl aceryl ricinoleate, with the amount of said component B not exceeding the amount of said component C.
Inventors
- 👤 Takao Yazaki
- 👤 Masataka Noro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:48
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/101; C08K5/103; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24521; Y10T428/24612; Y10T428/24628; Y10T428/24669; Y10T428/26; Y10T428/31504; Y10T428/31855; Y10T428/31931; Y10T428/31935
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
154 words
A stretch film comprising a resin composition composed of (A) a resin selected from the group consisting of (i) an ethylene-vinyl acetate copolymer resin having a vinyl acetate content of from about 5 to 25% by weight and (ii) a polybutadiene resin, (B) a binder, and (C) a lubricant, wherein the strecth film has a surface structure such that particles of binder (B) are scattered on the surface of the film layer composed of resin (A) containing residual amounts of binder (B) and lubricant (C) which do not migrate to the surface and the surface of the film layer and the entire surface of the particles of binder (B) are covered by lubricant (C) to form convex protubernances having a diameter of from 0.1 to 5μ and wherein the stretch film has a static friction coefficient of not more than 0.55 and an adhesive strength of not less than 200 g/2 cm 2 .
Claim 2
Dependent Claim
154 words
A stretch film comprising a resin composition composed of (A) a resin selected from the group consisting of (i) an ethylene-vinyl acetate copolymer resin having a vinyl acetate content of from about 5 to 25% by weight and (ii) a polybutadiene resin, (B) a binder, and (C) a lubricant, wherein the strecth film has a surface structure such that particles of binder (B) are scattered on the surface of the film layer composed of resin (A) containing residual amounts of binder (B) and lubricant (C) which do not migrate to the surface and the surface of the film layer and the entire surface of the particles of binder (B) are covered by lubricant (C) to form convex protubernances having a diameter of from 0.1 to 5μ and wherein the stretch film has a static friction coefficient of not more than 0.55 and an adhesive strength of not less than 200 g/2 cm 2 .
Claim 3
Dependent Claim
24 words
The stretch film as in claim 1, which is prepared by an inflation method with a blow ratio of from about 3 to 7.
Claim 4
Dependent Claim
17 words
The stretch film as in claim 1, which has a thickness of from about 10 to 100μ.
Claim 5
Dependent Claim
21 words
The stretch film as in claim 1, as a pre-package film which has a thickness of from about 13 to 25μ.
Claim 6
Dependent Claim
20 words
The stretch film as in claim 1, wherein each convex protuberance has a height of from about 0.05 to 0.5μ.
Claim 7
Dependent Claim
16 words
The stretch film as in claim 1, wherein the convex protuberances are substantially spherical convex protuberances.
Claim 8
Dependent Claim
12 words
The stretch film as in claim 1, wherein the polybutadiene is 1,2-polybutadiene.
Claim 9
Dependent Claim
26 words
The stretch film as in claim 1, wherein the binder is a fatty acid ester selected from the group consisting of sorbitan oleate and sorbitan laurate.
Claim 10
Dependent Claim
31 words
The stretch film as in claim 1, wherein the lubricant is a fatty acid ester selected from the group consisting of monoglycerin oleate, polyglycerin oleate, glyceryl triricinoleate and glyceryl acetyl ricinoleate.
Claim 11
Dependent Claim
48 words
The stretch film as in claim 1, which comprises from 90 to 99.6% of resin (A), from about 0.2 to 5 wt% of binder (B) and from about 0.2 to 5 wt% of lubricant (C), with the amount of binder (B) not exceeding the amount of lubricant (C).
Claim 12
Dependent Claim
19 words
The stretch film as in claim 10, wherein the weight ratio of (B):(C) is from about 0.8:1 to 0.2:1.
Claim 13
Dependent Claim
35 words
The stretch film as in claim 7, wherein the 1,2-polybutadiene has a melt flow index of from about 1 to 8 and a density of from about 0.890 g/cm 3 to 0.915 g/cm 2 .
Claim 14
Dependent Claim
19 words
The stretch film as in claim 1, wherein the vinyl acetate content is from about 10 to 20 wt%.
References Cited (Backward Citations)
US4066811A
Cited
US4168354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |