US4042565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stretched tubular film of polyethylene terephthalate
Assignee: Hoechst AG
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Filing: 1975-12-18
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Granted: 1977-08-16
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Expires: 1995-12-18
Abstract
Abstract This invention relates to a stretched, shrinkable, tubular film of polyethylene terephthalate which has a lower initial point of shrinkage, higher shrinking values, and improved weldability, in which part of the ethylene glycol component is replaced by about 0.5 to 10 mole per cent of bis-phenol-A-bis-(2-hydroxyethyl)-ether.
Inventors
- 👤 Klaus Hoheisel
- 👤 Siegfried Janocha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:27
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/60; C08J; C08J5/00; C08J5/18; C08J2367/00; C08J2367/02; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1345
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
48 words
An oriented, shrinkable, tubular film of polyethylene terephthalate which has a lower initial point of shrinkage, a shrinkage of more than 5 percent at 80° C, and improved weldability, in which part of the ethylene glycol component is replaced by about 0.5 to 10 mole percent of bis-phenol-A-bis-(2-hydroxyethyl)-ether.
Claim 2
Dependent Claim
48 words
An oriented, shrinkable, tubular film of polyethylene terephthalate which has a lower initial point of shrinkage, a shrinkage of more than 5 percent at 80° C, and improved weldability, in which part of the ethylene glycol component is replaced by about 0.5 to 10 mole percent of bis-phenol-A-bis-(2-hydroxyethyl)-ether.
Claim 3
Dependent Claim
23 words
A tubular film according to claim 1 in which the ethylene glycol component is replaced by 4 to 8 mole percent of bis-phenol-A-bis-(2-hydroxyethyl)-ether.
Claim 4
Dependent Claim
27 words
A tubular film according to claim 1 having an area stretching ratio of up to 1 : 20, especially between 1 : 10 and 1 : 16.
Claim 5
Dependent Claim
16 words
A tubular film according to claim 1 having an initial point of shrinkage below 70° C.
Claim 6
Dependent Claim
11 words
A welded bag made from a film according to 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) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |