US4764403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer biaxially oriented heat set articles
Assignee: Graham Packaging Plastic Products Inc
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Filing: 1986-11-10
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Granted: 1988-08-16
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Expires: 2006-11-10
Abstract
Abstract A multilayer biaxially oriented heatset article and method of making forming a preform comprising an outer layer and an inner layer of poly(ethylene terephthalate) (PET), an intermediate layer of olefin-vinyl alcohol copolymer, a layer of adhesive laminating the olefin-vinyl alcohol copolymer layer and the outer layer and a layer of adhesive laminating the inner olefin-vinyl alcohol copolymer layer and the inner layer. The preform is then heated to orientation temperature and blown against a heatset hot mold to produce an article such as a container that has high barrier properties, improved thermal stability, i.e., capable of being hot filled at elevated temperatures, have layer uniformity, good interlayer adhesion., good transparency and is light in weight.
Inventors
- 👤 Prakash R. Ajmera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:13
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C49/00; B29C49/22; B29C49/42; B29C49/64; B32B27/30; B32B27/306; B32B27/36; B32B7/00; B32B7/04; B32B7/12; B29C2949/00; B29C2949/07; B29C2949/0861; B29C2949/0862; B29C2949/30; B29C2949/3008; B29C2949/3012; B29C2949/3016; B29C2949/302; B29C2949/3024; B29C2949/3026; B29C2949/3028; B29C2949/303; B29C2949/3041; B29C2949/3042; B29C2949/3044; B29C2949/3046; B29K; B29K2023/00; B29K2023/04; B29K2023/08; B29K2023/083; B29K2067/00; B29K2995/00; B29K2995/0012; B29K2995/0017; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2323/00; B32B2323/04; Y; Y10; Y10S; Y10S264/00; Y10S264/90; Y10S264/905; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/28; Y10T428/2852; Y10T428/31504; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
A multilayer biaxially oriented heatset article comprising an outer layer comprising poly(ethylene terephthalate), an inner layer comprising poly(ethylene terephthalate), at least one intermediate layer of olefin-vinyl alcohol copolymer, an adhesive layer laminating the outer layer and the intermediate layer, and an adhesive layer laminating the inner layer and the intermediate layer, the thickness of said intermediate layer comprising less than 20% of the total thickness, said intermediate olefin-vinyl alcohol copolymer layer having greater uniformity in the heat set portions than the olefin-vinyl alcohol copolymer layer of an identical non-heatset multilayer article, the peel strength of the heat set multilayer article in the heat set portions being greater than the peel strength of an identical non-heatset multilayer article.
Claim 2
Dependent Claim
117 words
A multilayer biaxially oriented heatset article comprising an outer layer comprising poly(ethylene terephthalate), an inner layer comprising poly(ethylene terephthalate), at least one intermediate layer of olefin-vinyl alcohol copolymer, an adhesive layer laminating the outer layer and the intermediate layer, and an adhesive layer laminating the inner layer and the intermediate layer, the thickness of said intermediate layer comprising less than 20% of the total thickness, said intermediate olefin-vinyl alcohol copolymer layer having greater uniformity in the heat set portions than the olefin-vinyl alcohol copolymer layer of an identical non-heatset multilayer article, the peel strength of the heat set multilayer article in the heat set portions being greater than the peel strength of an identical non-heatset multilayer article.
Claim 3
Dependent Claim
13 words
The article set forth in claim 1 wherein said article is blow molded.
Claim 4
Dependent Claim
16 words
The article set forth in claim 1 wherein said article comprises a blow molded hollow container.
Claim 5
Dependent Claim
12 words
The article set forth in claim 1 wherein said article is thermoformed.
Claim 6
Dependent Claim
17 words
The article set forth in any of claims 1-4 wherein said intermediate layer comprises ethylene-vinyl alcohol copolymer.
Claim 7
Dependent Claim
17 words
The article set forth in claim 5 wherein the intermediate layer comprises about 20% to 60% ethylene.
Claim 8
Dependent Claim
15 words
The article set forth in claim 5 wherein said intermediate layer comprises about 30%-45% ethylene.
Claim 9
Dependent Claim
54 words
The article set forth in claim 1 wherein said outer and inner layer comprise more than 50% of the total wall thickness, the thickness of the intermediate layer comprises less than 20% of the total wall thickness and the total thickness of the adhesive layers comprises about 2 to 20% of the total thickness.
Claim 10
Dependent Claim
56 words
The article set forth in claim 1 wherein said outer and inner layer comprise more than 70% of the total wall thickness, the thickness of the intermediate layer comprises less than 10% of the total wall thickness and the total thickness of the adhesive layers comprises ranging between about 2 to 20% of the total thickness.
References Cited (Backward Citations)
US4535901A
Cited
US4564541A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |