US4049147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic skin envelopes for glass bottles and the like
Assignee: Millennium Petrochemicals Inc
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Filing: 1977-02-07
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Granted: 1977-09-20
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Expires: 1997-02-07
Abstract
Abstract A method of producing a lightweight, strong, uniform, foamed layer containing tubular film with good opacity which can be heat-shrunk onto an annular substrate such as a glass bottle rapidly and uniformly is accomplished by co-extruding a low density polyethylene and a mixture of an ethylene polymer and a blowing agent under particular conditions and causing the blowing agent to decompose thereby foaming the ethylene polymer.
Inventors
- 👤 Claude J. Stiles
- 👤 Daniel Tomo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:17
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/20; B29C44/22; B32; B32B; B32B27/00; B32B27/06; B32B27/065; B29C61/00; B29C61/06; B29C61/0608; B29C61/0616; B32B27/32; B65; B65D; B65D23/00; B65D23/08; B65D23/0842; B65D23/0878; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B29K; B29K2023/00; B29K2023/04; B29K2023/08; B29K2023/083; B29K2105/00; B29K2105/04; B29K2995/00; B29K2995/0018; B29K2995/0025; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/025; B32B2307/00; B32B2307/40; B32B2307/41; B32B2307/50; B32B2307/514; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2323/00; B32B2323/04; B32B2323/046; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317; Y10T428/1321; Y10T428/1328; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/249921; Y10T428/249953; Y10T428/249976; Y10T428/249977; Y10T428/249987; Y10T428/249988; Y10T428/249991; Y10T428/249992; Y10T428/249993; Y10T428/31504; Y10T428/31551; Y10T428/31645
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A seamless, lightweight, strong, uniform, multiply, oriented foamed layer tubular preform laminate with good opacity adapted to be heat-shrunk onto a tubular substrate rapidly and uniformly, said laminate comprising first and second plies of plastic material in overlying adherent relation, said first ply comprising a low density polyethylene and said second ply comprising an expanded ethylene polymer, the ply of low density polyethylene being about 10-20% of the thickness of the laminate, the skrinkage along the length of said preform upon application of heat being about 70-90% and the shrinkage in the transverse direction being about 5-15%.
Claim 2
Dependent Claim
97 words
A seamless, lightweight, strong, uniform, multiply, oriented foamed layer tubular preform laminate with good opacity adapted to be heat-shrunk onto a tubular substrate rapidly and uniformly, said laminate comprising first and second plies of plastic material in overlying adherent relation, said first ply comprising a low density polyethylene and said second ply comprising an expanded ethylene polymer, the ply of low density polyethylene being about 10-20% of the thickness of the laminate, the skrinkage along the length of said preform upon application of heat being about 70-90% and the shrinkage in the transverse direction being about 5-15%.
Claim 3
Dependent Claim
17 words
The tubular preform laminate of claim 1 wherein the expanded ply is disposed interiorly of said preform.
Claim 4
Dependent Claim
16 words
The tubular preform laminate of claim 2, wherein said laminate has a thickness of 10-20 mils.
Claim 5
Dependent Claim
13 words
A container having heat shrunk thereon the tubular preform laminate of claim 2.
Claim 6
Dependent Claim
18 words
A glass bottle having an adherent coating of the tubular preform laminate of claim 2 heat shrunk thereon.
Claim 7
Dependent Claim
16 words
The laminate of claim 1 wherein the ethylene polymer is polyethylene or an ethylene-vinyl acetate copolymer.
Claim 8
Dependent Claim
42 words
The laminate of claim 2 wherein upon the application of heat at a temperature of 180°-260° C. for a period of time of 10-30 seconds, the shrinkage in the machine direction is 70%-90% and the shrinkage in the transverse direction is 5%-10%.
Claim 9
Dependent Claim
24 words
The laminate of claim 7 wherein the shrinkage along the length is about 80% and the shrinkage in the transverse direction is about 10%.
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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |