US5264523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for mixing polytetrafluoroethylene molding powder and organic filler
Assignee: Daikin Industries Ltd
•
Filing: 1990-08-01
•
Granted: 1993-11-23
•
Expires: 2010-08-01
Abstract
Abstract A uniform mixture of a polytetrafluoroethylene molding powder and an organic filler, which can provide moldings having improved properties without lowering the appearance and mechanical property, is obtained without sticking the filler to the wall of a mixer by mixing the molding powder and the filler in the presence of a silane coupling agent and a polar solvent, or by previously treating the organic filler with the silane coupling agent and mixing the treated filler with the molding powder.
Inventors
- 👤 Norimasa Honda
- 👤 Tomohiko Hirata
- 👤 Hirokazu Yukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:01
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08J; C08J3/00; C08J3/005; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
49 words
A process for preparing a solid mixture a polytetrafluoroethylene molding powder obtained by suspension polymerization with an organic filler which comprises mixing said molding powder and organic filler in the presence of a silane coupling agent and a polar solvent wherein the organic filler is a heat-resistant polymer powder.
Claim 2
Dependent Claim
49 words
A process for preparing a solid mixture a polytetrafluoroethylene molding powder obtained by suspension polymerization with an organic filler which comprises mixing said molding powder and organic filler in the presence of a silane coupling agent and a polar solvent wherein the organic filler is a heat-resistant polymer powder.
Claim 3
Dependent Claim
25 words
The process of claim 1, wherein said silane coupling agent is dissolved in said polar solvent and added to said molding powder and organic filler.
Claim 4
Dependent Claim
25 words
The process of claim 1, wherein said silane coupling agent is present in an amount 0.001 to 10% by weight based on said organic filler.
Claim 5
Dependent Claim
25 words
The process of claim 1, wherein said polar solvent is present in an amount of 0.001 to 50% by weight based on said organic filler.
Claim 6
Dependent Claim
23 words
The process of claim 1, wherein the ratio of said molding powder to said organic filler is from 60:40 to 95:5 by weight.
Claim 7
Dependent Claim
24 words
The process of claim 1, wherein said organic filler is a heat resistant polymer having an average particle size of 1 to 100 μm.
Claim 8
Dependent Claim
44 words
A process for preparing a solid mixture a polytetrafluoroethylene molding powder obtained by suspension polymerization with an organic filler which comprises mixing said molding powder with an organic filler treated with a silane coupling agent wherein the organic filler, is a heat-resistant polymer powder.
Claim 9
Dependent Claim
44 words
A process for preparing a solid mixture a polytetrafluoroethylene molding powder obtained by suspension polymerization with an organic filler which comprises mixing said molding powder with an organic filler treated with a silane coupling agent wherein the organic filler, is a heat-resistant polymer powder.
Claim 10
Dependent Claim
18 words
The process of claim 7, wherein said mixing is carried out in the presence of a polar solvent.
Claim 11
Dependent Claim
33 words
The process of claim 7, wherein said organic filler is mixed with said silane coupling agent in the presence of a polar solvent, and the resulting mixture is mixed with said molding powder.
Claim 12
Dependent Claim
18 words
The process of claim 7, wherein said mixing is carried out in the absence of a polar solvent.
Claim 13
Dependent Claim
17 words
The process of claim 1, wherein said polar solvent is removed after the completion of the mixing
Claim 14
Dependent Claim
16 words
The process of claim 1, wherein said mixing is carried out with removing said polar solvent.
Claim 15
Dependent Claim
16 words
The process of claim 7, wherein said polar solvent is removed after completion of the mixing.
Claim 16
Dependent Claim
16 words
The process of claim 7, wherein said mixing is carried out with removing said polar solvent.
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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) | 1996-11-22 | 1997-05-24 | 1997-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-22 | 2001-05-24 | 2001-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-22 | 2005-05-24 | 2005-11-23 | $7700.00 | Window Closed / Lapsed |