US5145728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oriented polyethylene film
Assignee: Tonen General Sekiyu KK
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Filing: 1991-06-12
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Granted: 1992-09-08
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Expires: 2011-06-12
Abstract
Abstract An oriented polyethylene film with an excellent moistureproofness and optical property is provided in which the degree of crosslinking is uniform or decreases inwardly across the thickness of the film, and which consists of a composition comprising (A) 50 to 90% by weight of polyethylene with a density of at least 0.935 g/cm 3 and a high load melt index to melt index ratio of at most 100 and (B) 50 to 10% by weight of a petroleum resin or linear low density polyethylene.
Inventors
- 👤 Yasushi Itaba
- 👤 Yutaka Yoshifuji
- 👤 Takayoshi Kondo
- 👤 Keichiro Saitoh
- 👤 Tadao Yoshino
- 👤 Minoru Izawa
- 👤 Ichiro Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:33
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08J; C08J5/00; C08J5/18; C08J2323/00; C08J2323/02; C08J2323/04; C08L2205/00; C08L2205/03; C08L23/08; C08L23/0807; C08L23/0815; C08L2312/00; C08L2312/06; C08L57/00; C08L57/02; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
103 words
A film for a shrink label, consisting of a composition comprising 50 to 85% by weight of high density polyethylene having a density of at least 0.935 g/cm 3 and high load melt index to melt index ratio or at most 50, and 15 to 50% by weight of a linear low density polyethylene and a petroleum resin, the quantity of the petroleum resin being at most 25% by weight, and being crosslinked in such a manner that the degree of crosslinking inwardly decreases across the thickness of the film or an uncrosslinked portion is formed, and oriented at least in one direction.
Claim 2
Dependent Claim
103 words
A film for a shrink label, consisting of a composition comprising 50 to 85% by weight of high density polyethylene having a density of at least 0.935 g/cm 3 and high load melt index to melt index ratio or at most 50, and 15 to 50% by weight of a linear low density polyethylene and a petroleum resin, the quantity of the petroleum resin being at most 25% by weight, and being crosslinked in such a manner that the degree of crosslinking inwardly decreases across the thickness of the film or an uncrosslinked portion is formed, and oriented at least in one direction.
Claim 3
Dependent Claim
35 words
The film as claimed in claim 1, wherein the petroleum resin is selected from the group consisting of resins substantially composed of cyclopentadiene type and higher olefin type hydrocarbons and hydrogenated products of these resins.
Claim 4
Dependent Claim
26 words
The film as claimed in claim 1, wherein the high density polyethylene is crystalline ethylene homopolymer or ethylene-α-olefin copolymer produced by a medium- or low-pressure process.
Claim 5
Dependent Claim
25 words
The film as claimed in claim 1, wherein the linear low density polyethylene is selected from the group consisting of copolymers of ethylene and α-olefins.
Claim 6
Dependent Claim
16 words
The film in claim 4, wherein the α-olefins are butene-1, pentene-1, hexene-1, 4-methylpentene-1, heptene-1 and octene-1.
Claim 7
Dependent Claim
43 words
The film as claimed in claim 1, wherein the linear low density polyethylene has a density of 0.890 to 0.935 g/cm 3 , MI of 0.5 to 20 and weight average molecular weight Mw/number average molecular weight Mn ratio of 3 to 12.
Claim 8
Dependent Claim
59 words
The film as claimed in claim 1, wherein the crosslinking is carried out in such a manner as to form a sheet wherein the opposite outer layer portions of the sheet each have gel fractions of between 20 to 70% by weight and the middle layer portion of the sheet has gel fractions between 0 to 5% by weight.
Claim 9
Dependent Claim
39 words
The film as claimed in claim 7, wherein the outer layer portions are crosslinked and the middle layer portion is uncrosslinked, the thickness ratio of the outer layer portion/middle layer portion/outer layer portion thereof ranging from 1:0.1:1 to 1:10:1.
Claim 10
Dependent Claim
24 words
The film as claimed in claim 1, wherein the crosslinking is carried out by irradiating both surfaces of a stock sheet with electron beam.
Claim 11
Dependent Claim
27 words
The film as claimed in claim 1, obtained by stretching a crosslinked stock sheet at least in one direction with a draw ratio of at least 300%.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-08 | 1996-03-09 | 1996-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-08 | 2000-03-09 | 2000-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-08 | 2004-03-09 | 2004-09-08 | $7700.00 | Window Closed / Lapsed |