US4454198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous, powdery polypropylene
Assignee: Akzo NV
•
Filing: 1983-02-07
•
Granted: 1984-06-12
•
Expires: 2003-02-07
Abstract
Abstract Porous, powdery polypropylene is disclosed, obtained by providing a hot solution of polypropylene in pentaerythrol ester as solvent, slowly cooling said solution down to approximately room temperature to provide a solidified mass with or without affecting mechanical size reduction of said solidified mass, and extracting said solidified mass with an extractant in which pentaerythrol is soluble, with or without subsequently removing said solvent to a high degree.
Inventors
- 👤 Walter Fickel
- 👤 Gerhard Ries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:49
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/26; A; A01; A01N; A01N25/00; A01N25/08; A01N25/10; B; B01; B01J; B01J20/00; B01J20/22; B01J20/26; C08J3/00; C08J3/12; C09; C09D; C09D7/00; C09D7/40; C09D7/65; C09D7/70; C09K; C09K3/00; C09K3/32; C08J2201/00; C08J2201/04; C08J2201/042; C08J2201/0422; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
88 words
Porous, powdery polypropylene having an apparent density of 0.1 to 0.3 g/cm 3 , a particle size of 5-700 μm, and an external porosity of 70-85% obtained by providing a hot solution of polypropylene in pentaerythrol ester as solvent, slowly cooling said solution down to approximately room temperature to provide a solidified mass with or without affecting mechanical size reduction of said solidified mass, and extracting said solidified mass with an extractant in which pentaeryhtrol is soluble, with or without subsequently removing said solvent to a high degree.
Claim 2
Dependent Claim
88 words
Porous, powdery polypropylene having an apparent density of 0.1 to 0.3 g/cm 3 , a particle size of 5-700 μm, and an external porosity of 70-85% obtained by providing a hot solution of polypropylene in pentaerythrol ester as solvent, slowly cooling said solution down to approximately room temperature to provide a solidified mass with or without affecting mechanical size reduction of said solidified mass, and extracting said solidified mass with an extractant in which pentaeryhtrol is soluble, with or without subsequently removing said solvent to a high degree.
Claim 3
Dependent Claim
15 words
Porous, powdery polypropylene according to claim 1, having an apparent density 0.3-0.15 g/cm 3 .
Claim 4
Dependent Claim
16 words
Porous, powdery polypropylene according to claim 1, having a particle size of 50 to 150 μm.
Claim 5
Dependent Claim
40 words
In a method for the separation of hydrophobic substances from aqueous systems of the type wherein said aqueous systems are contacted with separation means, the improvement comprising employing as said separation means porous, powdery polypropylene in accordance with claim 1.
Claim 6
Dependent Claim
10 words
Method according to claim 4, for the separation of oil.
Claim 7
Dependent Claim
31 words
In a method for the adsorption of liquids wherein said liquids are contacted with adsorption means, the improvement comprising employing as said absorption means porous powdery polypropylene according to claim 1.
Claim 8
Dependent Claim
10 words
Method according to claim 6, for the adsorption of oil.
Claim 9
Dependent Claim
23 words
In a method of preparing paints, the improvement comprising employing as additive to said paints porous, powdery polypropylene in accordance with claim 1.
Claim 10
Dependent Claim
17 words
Method according to claim 8, comprising employing said porous, powdery polypropylene as an additive to protective paints.
Claim 11
Dependent Claim
54 words
In a method for the long-term release of substances, wherein carrier means are saturated or charged with different substances, the improvement comprising saturating or charging porous, powdery popypropylene in accordance with claim 1 with said substances, whereby said substances are released from said porous, powdery popypropylene to the exterior in the course of time.
Claim 12
Dependent Claim
16 words
Method according to claim 10, wherein said substances that are carried for long-term release comprise odorants.
Claim 13
Dependent Claim
16 words
Method according to claim 10, wherein said substances for long-term release comprise sexual attractants for insects.
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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |