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 Title: |
US5721283:
Porous polytetrafluoroethylene and preparation
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Howard, Jr., Edward George; Hockessin, DE
Moss, Arthur Zenker; Wilmington, DE
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| Assignee: |
E. I. du Pont de Nemours and Company
other patents from E. I. DU PONT DE NEMOURS AND COMPANY (165265) (approx. 15,067)
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| Published / Filed: |
1998-02-24
/ 1995-03-20
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| Application Number: |
US1995000406624
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| IPC Code: |
Advanced:
A41D 31/00;
A41D 31/02;
A61L 27/16;
A61L 31/04;
B01D 39/16;
B01D 39/20;
B01D 67/00;
B01D 71/36;
C08J 5/18;
C08J 9/18;
C08J 9/28;
C08J 9/40;
D01D 5/247;
D01F 6/12;
D06M 13/02;
D06M 13/03;
D06M 13/07;
D06M 13/08;
D06M 15/244;
D06M 15/256;
D06M 23/00;
D06M 23/10;
D06N 3/04;
A61F 2/08;
IPC-7:
C08J 9/14;
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| ECLA Code: |
B01D67/00K18D; A41D31/00C; A41D31/02; A61L27/16; A61L31/04H; B01D39/16K; B01D39/20D4; B01D39/20F; B01D67/00K18; B01D71/36; C08J5/18; C08J9/18; C08J9/28; C08J9/40; D01D5/247; D01F6/12; D06M13/02; D06M13/03; D06M13/07; D06M13/08; D06M13/08B; D06M15/244; D06M15/256; D06M23/00; D06M23/10; D06N3/04F; K61F2/08; L01D239/02F; L01D239/04P6; L01D239/06F; L01D239/10; L01D239/12B; L01D239/12D; L01D239/12Y; M08J201/032; M08J327/18;
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| U.S. Class: |
Current:
521/060;
428/421;
428/422;
521/059;
521/061;
521/063;
521/064;
521/134;
521/145;
Original:
521/060;
521/059;
521/061;
521/063;
521/064;
521/134;
521/145;
428/421;
428/422;
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| Field of Search: |
521/145,60,61,63,64,59,134
428/421,422
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| Priority Number: |
| 1995-03-20 |
US1995000406624 |
| 1993-12-17 |
US1993000169461 |
| 1993-05-21 |
US1993000065735 |
| 1992-08-28 |
US1992000936447 |
| 1992-06-25 |
US1992000904244 |
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| Abstract: |
This invention relates to porous polyfluoroethylene (PTFE), shaped articles prepared therefrom, and to methods of preparing said articles.
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| Primary / Asst. Examiners: |
Cooney, Jr., John M.;
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Parent Case: |
This application is a continuation in part of U.S. application Ser. No. 08/169,461, filed on Dec. 17, 1993, which is now abandoned; which is a continuation in part of U.S. application Ser. No. 08/065,735, filed on May 21, 1993, which is now abandoned; which is a continuation in part of U.S. application Ser. No. 07/936,447, filed on Aug. 28, 1992, which is now abandoned; which is a continuation in part of 07/904,244, filed on Jun. 25, 1992, which is now abandoned.
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| Designated Country: |
BR CA KR ES FR GB IT NL SE
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| Family: |
Show 19 known family members
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First Claim:
Show all 30 claims |
What is claimed is:
1. A porous polytetrafluoro-ethylene PTFE/polymer composition prepared by a process comprising:
- (a) contacting PTFE with a fluid which penetrates and swells but does not significantly dissolve the polymer or eliminate viscoelastic memory therefrom, at a temperature in the range of about 250°-400° C.;
- (b) cooling and separating the penetrated polymer from unabsorbed fluid, said polymer containing up to about 80% by weight of absorbed fluid; and
- (c) removing the absorbed fluid, to form a porous product having a single DSC melting endotherm, the melting point being in the range of about 315° to 333° C. with an associated heat of fusion of at least 35 J/g.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 11 U.S. patent(s) that reference this one
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