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US4847129A
Expired / Lapsed
US
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Multilayer preform for hot fill containers
Assignee: Graham Packaging Pet Technologies Inc
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Filing: 1988-09-16
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Granted: 1989-07-11
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Expires: 2008-09-16
Abstract
Abstract This relates to the formation of a preform for a container which is formed primarily of PET and like saturated polyesters which are to be utilized in the packaging of a hot fill liquid and like product, particularly a container wherein a metal closure is to be utilized. The preform is of a laminated construction with the body of the preform being of a five layer construction and the neck finish portion being primarily of a three layer construction including outer layers of PET or like saturated polyester and a core formed of a high Tg polymer. The same high Tg polymer would be in the form of thin layers in the body of the preform between inner and outer layers and a core.
Inventors
- 👤 Wayne N. Collette
- 👤 David P. Piccioli
- 👤 Suppayan M. Krishnakumar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:22
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/16; B29C45/1642; B29C45/1643; B65; B65D; B65D1/00; B65D1/02; B65D1/0207; B65D1/0215; B29C2949/00; B29C2949/07; B29C2949/081; B29C2949/0811; B29C2949/0819; B29C2949/30; B29C2949/3008; B29C2949/3009; B29C2949/3012; B29C2949/3016; B29C2949/302; B29C2949/3024; B29C2949/3026; B29C2949/3028; B29C2949/303; B29C2949/3032; B29C2949/3034; B29C2949/3036; B29C2949/3038; B29C49/00; B29C49/42; B29C49/64; B29C49/6604; B29C49/6605; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
163 words
A preform for forming a blow molded container particularly adapted to receive a hot fill product and be closed by a screw threaded closure, said preform having a molded neck finish including external threads for receiving a closure, said preform being of a laminated construction and including at least five layers below said neck finish and only three layers in the area of said threads; said five layers including inner and outer layers, inner and outer intermediate layers, and a core layer; said three layers including said inner and outer layers and a core layer, said core layer of said three layers forming a major portion of the cross section of said neck finish in the area of said threads, said core layer of said three layers being formed of a plastic having a higher Tg than said outer and inner layers, and said inner and outer intermediate layers being formed of the same material as said core layer of said three layers.
Claim 2
Dependent Claim
163 words
A preform for forming a blow molded container particularly adapted to receive a hot fill product and be closed by a screw threaded closure, said preform having a molded neck finish including external threads for receiving a closure, said preform being of a laminated construction and including at least five layers below said neck finish and only three layers in the area of said threads; said five layers including inner and outer layers, inner and outer intermediate layers, and a core layer; said three layers including said inner and outer layers and a core layer, said core layer of said three layers forming a major portion of the cross section of said neck finish in the area of said threads, said core layer of said three layers being formed of a plastic having a higher Tg than said outer and inner layers, and said inner and outer intermediate layers being formed of the same material as said core layer of said three layers.
Claim 3
Dependent Claim
22 words
A preform according to claim 1 wherein said high Tg plastic is a polymer with a Tg in excess of 80° C.
Claim 4
Dependent Claim
18 words
A preform according to claim 1 wherein said inner and outer layers are formed of a saturated polyester.
Claim 5
Dependent Claim
42 words
A preform according to claim 1 wherein the Tg of the material of said inner and outer layers is in the range of 155°-165° F. and the Tg of said core of said three layers is in the range of 179°-210° F.
Claim 6
Dependent Claim
19 words
A preform according to claim 1 wherein the high Tg plastic constitutes 5-10% of the volume of said preform.
Claim 7
Dependent Claim
27 words
A preform according to claim 1 wherein in said three layers said high Tg layer constitutes from 50 to 90% of the thickness of said three layers.
Claim 8
Dependent Claim
16 words
A preform according to claim 1 wherein said inner and outer layers are formed of PET.
Claim 9
Dependent Claim
29 words
A preform according to claim 1 wherein said inner and outer layers are formed of PET which is a 0-5% copolymer having an IV ranging from 0.70 to 0.86.
Claim 10
Dependent Claim
26 words
A preform according to claim 1 wherein said core layer of said five layers is formed of the same material as said inner and outer layers.
Claim 11
Dependent Claim
15 words
A preform according to claim 1 wherein said preform is formed of only two materials.
Claim 12
Dependent Claim
11 words
A blow molded container formed from the preform of claim 1.
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) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |