US4665113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of an agglomerated molding powder composed of polytetrafluoroethylene and metallic fillers
Assignee: Hoechst AG
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Filing: 1986-04-10
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Granted: 1987-05-12
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Expires: 2006-04-10
Abstract
Abstract The joint agglomeration of PTFE and metal-containing fillers belonging to the group comprising copper, tin and alloys thereof with one another and with other metals is improved if an alkylsulfate or an alkanesulfonate having 10 to 18 carbon atoms is added to the liquid agglomeration medium.
Inventors
- 👤 Karl Eberl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:54
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08J3/12; C08J3/16; C08K; C08K3/00; C08K3/02; C08K3/08; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
144 words
A process for the preparation of an agglomerated molding powder composed of agglomerates of a non-melt-fabricable tetrafluoroethylene polymer together with at least one finely divided metallic filler belonging to the group comprising copper and tin and alloys thereof with one another or with other metals, the filler being present in a uniformly divided state in the agglomerated particles, by premixing, suspending and stirring, with agglomeration, a finely divided, granular tetrafluoroethylene polymer powder and the filler in a liquid medium composed of water and an organic liquid which wets the tetrafluoroethylene polymer powder and is soluble in water to the extent of not more than 15% by weight, in the presence of a water-repellent, the improvement which comprises an alkanesulfonate or an alkylsulfate containing an alkane or alkyl radical having 10 to 18 carbon atoms being present in the liquid medium during the agglomeration process.
Claim 2
Dependent Claim
144 words
A process for the preparation of an agglomerated molding powder composed of agglomerates of a non-melt-fabricable tetrafluoroethylene polymer together with at least one finely divided metallic filler belonging to the group comprising copper and tin and alloys thereof with one another or with other metals, the filler being present in a uniformly divided state in the agglomerated particles, by premixing, suspending and stirring, with agglomeration, a finely divided, granular tetrafluoroethylene polymer powder and the filler in a liquid medium composed of water and an organic liquid which wets the tetrafluoroethylene polymer powder and is soluble in water to the extent of not more than 15% by weight, in the presence of a water-repellent, the improvement which comprises an alkanesulfonate or an alkylsulfate containing an alkane or alkyl radical having 10 to 18 carbon atoms being present in the liquid medium during the agglomeration process.
Claim 3
Dependent Claim
14 words
The process according to claim 1, wherein sodium laurylsulfate is employed as the alkylsulfate.
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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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |