US4704424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic materials
Assignee: PQ Corp
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Filing: 1986-05-21
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Granted: 1987-11-03
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Expires: 2006-05-21
Abstract
Abstract Various type A zeolites can be combined with thermoplastic materials to provide antiblock and improved optical properties to films or sheets of said thermoplastic. The zeolites are of less than full hydration, and at least a portion of the sodium is replaced with multivalent ions such as calcium and magnesium. The zeolites can also be acid treated to provide zeolites that contain hydronium ions.
Inventors
- 👤 Bruce W. Sands
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:53
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
In a low density polyethylene polymer suitable for forming a sheet or film with antiblock properties, the said sheet or film comprising said polymer and a powdered zeolite, the improvement comprising the zeolite being of the following composition: Zeolite (M.sub.x Na.sub.12-(nx+y) (H.sub.3 O).sub.y.sup.+).zH.sub.2 O wherein M is a multivalent metal of valence n, x is 0 to 6 and y is 0.6 to 5.3 and z is such that the zeolite contains 10 to 20% water.
Claim 2
Dependent Claim
76 words
In a low density polyethylene polymer suitable for forming a sheet or film with antiblock properties, the said sheet or film comprising said polymer and a powdered zeolite, the improvement comprising the zeolite being of the following composition: Zeolite (M.sub.x Na.sub.12-(nx+y) (H.sub.3 O).sub.y.sup.+).zH.sub.2 O wherein M is a multivalent metal of valence n, x is 0 to 6 and y is 0.6 to 5.3 and z is such that the zeolite contains 10 to 20% water.
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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) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |