US5147724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing smooth surfaces on plastics
Assignee: MG Industries Inc
•
Filing: 1991-10-08
•
Granted: 1992-09-15
•
Expires: 2011-10-08
Abstract
Abstract Plastic objects are exposed to a gas mixture containing fluorine and a gaseous oxidizing agent, to produce an extremely smooth surface on the objects. The oxidizing agent can be oxygen, and the object is preferably exposed to the gaseous mixture for about 10-30 seconds. The surface of the object treated according to the present invention is found to be considerably more smooth and glossy than objects treated with fluorine alone, without the oxidizing agent. The surface formed according to the present invention therefore minimizes the contact area between the treated object and the surrounding media.
Inventors
- 👤 ManfredNeumann Eschwey
- 👤 Rolf van Bonn
- 👤 Horst Neumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:42
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; B; B29; B29C; B29C59/00; C08J7/126; B29K; B29K2009/00; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/10; B29K2023/12; B29K2025/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
53 words
A plastic object having a smooth surface the object is made of a polymer selected from the group consisting of ethylene, propylene, butadiene polystyrene and hydrocarbon compounds the object being produced by a process of selecting the object and exposing the object to a gas mixture containing fluorine and a gaseous oxidizing agent.
Claim 2
Dependent Claim
53 words
A plastic object having a smooth surface the object is made of a polymer selected from the group consisting of ethylene, propylene, butadiene polystyrene and hydrocarbon compounds the object being produced by a process of selecting the object and exposing the object to a gas mixture containing fluorine and a gaseous oxidizing agent.
Claim 3
Dependent Claim
11 words
The object of claim 1 wherein the oxidizing agent is oxygen.
Claim 4
Dependent Claim
20 words
The object of claim 1, wherein the gas mixture contains about 0.01-0.5% fluorine, by volume, and 0.5-21% oxygen, by volume.
Claim 5
Dependent Claim
24 words
The object of claim 1, wherein the object is exposed to the gas mixture at temperatures above the crystal melting point of the polymer.
Claim 6
Dependent Claim
21 words
The object of claim 1 wherein the object is exposed to the gas mixture for a period of about 10-30 seconds.
Claim 7
Dependent Claim
71 words
An object made of HDPE, produced according to the process comprising the step of exposing the object to a gas mixture containing fluorine and a gaseous oxidizing agent, wherein the process is performed at temperatures above the crystal melting point of the HDPE, wherein the process is performed at temperatures between about 130° and 160° C., and wherein the object has a surface roughness of between about 0.4 and 0.6 μm.
Claim 8
Dependent Claim
71 words
An object made of HDPE, produced according to the process comprising the step of exposing the object to a gas mixture containing fluorine and a gaseous oxidizing agent, wherein the process is performed at temperatures above the crystal melting point of the HDPE, wherein the process is performed at temperatures between about 130° and 160° C., and wherein the object has a surface roughness of between about 0.4 and 0.6 μm.
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) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |