US4618386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a multilayered container
Assignee: Mitsui Chemicals Inc
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Filing: 1985-07-08
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Granted: 1986-10-21
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Expires: 2005-07-08
Abstract
Abstract Anti-gas permeation property and impact strength of a container such as a bottle which is made of polyethylene terephthalate resin by biaxially orienting blow molding are improved by using a multilayered structure of the polyethylene terephthalate and the other polyester of a dicarboxylic acid component containing a specific amount of isophthalic acid and a glycol component. The container is made preferably by preparing a preform which is a laminate of the polyethylene terephthalate and the other polyester in the molten state under pressure, and by biaxially orienting blow molding the preform.
Inventors
- 👤 Tadao Yatsu
- 👤 Nobuya Hinooka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:15
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/22; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/36; B29C2949/00; B29C2949/07; B29C2949/081; B29C2949/0811; B29C2949/0819; B29C2949/0829; B29C2949/0861; B29C2949/0862; B29C2949/0872; B29C2949/30; B29C2949/3008; B29C2949/3012; B29C2949/3016; B29C2949/302; B29C2949/3024; B29C2949/3026; B29C2949/3028; B29C2949/3032; B29C2949/3034; B29C2949/3036; B29C2949/3041; B29C2949/3042; B29C2949/3044; B29K; B29K2067/00; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/70; B32B2307/704; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/29; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
159 words
A method of making a multilayered container comprising (1) laminating a layer of molten polyethylene terephthalate (A) and a layer of polyester (B) consisting of a dicarboxylic acid component containing isophthalic acid in an amount exceeding 20 molar % and a glycol component comprising ethylene glycol in an amount exceeding 80 molar %, while layer (A) and layer (B) are maintained at a temperature of 230° to 350° C. and 180° to 260° C., respectively, under a pressure (gauge) of 20 kg/cm 2 or higher; (2) cooling and solidifying the laminate to a temperature of -10 to 30° C. so as to prepare a preform which comprises essentially of the layer of polyethylene terephthalate (A) and the layer of polyester (B); and (3) biaxially orienting and blow molding the preform at an orientation temperature of 80° to 130° C. under drawing of at least 1.5 times in the axial direction and at least 2 times in the radial directions.
Claim 2
Independent Claim
159 words
A method of making a multilayered container comprising (1) laminating a layer of molten polyethylene terephthalate (A) and a layer of polyester (B) consisting of a dicarboxylic acid component containing isophthalic acid in an amount exceeding 20 molar % and a glycol component comprising ethylene glycol in an amount exceeding 80 molar %, while layer (A) and layer (B) are maintained at a temperature of 230° to 350° C. and 180° to 260° C., respectively, under a pressure (gauge) of 20 kg/cm 2 or higher; (2) cooling and solidifying the laminate to a temperature of -10 to 30° C. so as to prepare a preform which comprises essentially of the layer of polyethylene terephthalate (A) and the layer of polyester (B); and (3) biaxially orienting and blow molding the preform at an orientation temperature of 80° to 130° C. under drawing of at least 1.5 times in the axial direction and at least 2 times in the radial directions.
Claim 3
Dependent Claim
21 words
The method of claim 1, wherein the amount of isophthalic acid in the polyester (B) is 30 molar % or more.
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) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |