Patent US4092289A successfully refreshed from Google Patents.
US4092289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester composition
Assignee: Imperial Chemical Industries Ltd
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Filing: 1976-09-07
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Granted: 1978-05-30
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Expires: 1996-09-07
Abstract
Abstract Polyester compositions suitable for the production of oriented films contain filler agglomerates of mixtures of primary inert particles having opposite electrical charges in polar media, preferably pyrogenic alumina and pyrogenic silica. The preferred particles give optically clear films and the presence of alumina aids filtration.
Inventors
- 👤 Timothy Alan Remmington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:34
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/34; C08K3/36; C08K7/00; Y; Y10; Y10S; Y10S260/00; Y10S260/35
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
47 words
A linear polyester composition which contains 0.01 to 10% by weight of the total composition of an inert particulate additive comprising a mixture of particulate pyrogenic silica and particulate pyrogenic alumina, each of the particulate materials having a mean primary particle size of up to 100 millimicrons.
Claim 2
Dependent Claim
47 words
A linear polyester composition which contains 0.01 to 10% by weight of the total composition of an inert particulate additive comprising a mixture of particulate pyrogenic silica and particulate pyrogenic alumina, each of the particulate materials having a mean primary particle size of up to 100 millimicrons.
Claim 3
Dependent Claim
18 words
A polyester composition according to claim 1, which contains 0.05 to 0.5% by weight of the particulate additive.
Claim 4
Dependent Claim
24 words
A polyester composition according to claim 1, in which the silica and the alumina have a mean particle size of 5 to 40 millimicrons.
Claim 5
Dependent Claim
31 words
A polyester composition according to claim 1, in which the particulate additive consists of 30 to 95% by weight of the alumina and 70 to 15% by weight of the silica.
Claim 6
Dependent Claim
36 words
A method of producing a polyester composition according to claim 1, which comprises forming a slurry of glycol and the particulate materials and adding the slurry to the polycondensation mixture from which the polyester is produced.
Claim 7
Dependent Claim
52 words
A linear polyester composition which contains 0.05 to 0.5% by weight of the total composition of an inert particulate additive comprising 30 to 95 parts by weight of pyrogenic alumina and 70 to 15 parts by weight of pyrogenic silica each having a mean primary particle size of up to 100 millimicrons.
Claim 8
Dependent Claim
52 words
A linear polyester composition which contains 0.05 to 0.5% by weight of the total composition of an inert particulate additive comprising 30 to 95 parts by weight of pyrogenic alumina and 70 to 15 parts by weight of pyrogenic silica each having a mean primary particle size of up to 100 millimicrons.
Claim 9
Dependent Claim
24 words
A polyester composition according to claim 6, in which the silica and the alumina have a mean particle size of 5 to 40 millimicrons.
Claim 10
Dependent Claim
36 words
A method of producing a polyester composition according to claim 6, which comprises forming a slurry of glycol and the particulate materials and adding the slurry to the polycondensation mixture from which the polyester is produced.
Claim 11
Dependent Claim
13 words
A shaped article produced from a linear polyester composition according to claim 1.
Claim 12
Dependent Claim
13 words
A shaped article produced from a linear polyester composition according to claim 6.
Claim 13
Dependent Claim
12 words
A film produced from a linear polyester composition according to claim 1.
Claim 14
Dependent Claim
12 words
A film produced from a linear polyester composition according to claim 6.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |