Patent US4370376A successfully refreshed from Google Patents.
US4370376A
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US
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Tetrafluoroethylene polymer dispersions
Assignee: EIDP Inc
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Filing: 1981-08-27
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Granted: 1983-01-25
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Expires: 2001-08-27
Abstract
Abstract Tetrafluoroethylene polymer coating dispersions when coated on glass fabric improve acid resistance of the fabric if the dispersions contain a selected silane, siloxane and water repellant.
Inventors
- 👤 Subhash V. Gangal
- 👤 Allan H. Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:47
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C03; C03C; C03C25/00; C03C25/10; C03C25/24; C03C25/26; C03C25/28; C03C25/30; C03C25/305; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C08L33/00; C08L33/04; C08L33/14; C08L33/16; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2549; Y10T442/2574
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
A coating dispersion which imparts resistance to attack by acidic flue gas to glass fabric coated with said dispersion, consisting essentially of (a) water, (b) 5-65% by weight tetrafluoroethylene polymer, said weight based on weight of water and polymer, said polymer being of film-forming molecular weight, (c) 2-60% by weight of a polyhydrolyzable silane of the formula R.sub.1 Si--(OR).sub.3 wherein R is lower alkyl, preferably alkyl of 1-3 carbon atoms, and R 1 is phenyl or substituted lower alkyl, preferably of 1-3 carbon atoms, in which the substituents are selected from halogen, quaternary ammonium, or --NR'R" in which R' and R" are each H, lower alkyl, lower alkoxyalkyl, amino lower alkyl, hydroxyl lower alkyl, or substituted amino lower alkyl, said weight based on weight of tetrafluoroethylene polymer, (d) 1-20% by weight of a hydrocarbyl siloxane, said weight based on weight of tetrafluoroethylene polymer, (e) 1-20% by weight of a polymer of a fluorinated ester of an acrylic acid, said weight based on weight of tetrafluoroethylene polymer.
Claim 2
Dependent Claim
166 words
A coating dispersion which imparts resistance to attack by acidic flue gas to glass fabric coated with said dispersion, consisting essentially of (a) water, (b) 5-65% by weight tetrafluoroethylene polymer, said weight based on weight of water and polymer, said polymer being of film-forming molecular weight, (c) 2-60% by weight of a polyhydrolyzable silane of the formula R.sub.1 Si--(OR).sub.3 wherein R is lower alkyl, preferably alkyl of 1-3 carbon atoms, and R 1 is phenyl or substituted lower alkyl, preferably of 1-3 carbon atoms, in which the substituents are selected from halogen, quaternary ammonium, or --NR'R" in which R' and R" are each H, lower alkyl, lower alkoxyalkyl, amino lower alkyl, hydroxyl lower alkyl, or substituted amino lower alkyl, said weight based on weight of tetrafluoroethylene polymer, (d) 1-20% by weight of a hydrocarbyl siloxane, said weight based on weight of tetrafluoroethylene polymer, (e) 1-20% by weight of a polymer of a fluorinated ester of an acrylic acid, said weight based on weight of tetrafluoroethylene polymer.
Claim 3
Dependent Claim
12 words
The coating dispersion of claim 1 wherein the tetrafluoroethylene polymer is polytetrafluoroethylene.
Claim 4
Dependent Claim
49 words
The coating dispersion of claim 2 wherein the silane has the formula R 1 Si(OR) 3 wherein R is --CH 3 or --C 2 H 5 and R 1 is substituted lower alkyl in which the substituent is in the γ position and is an amino- or amino-substituted group.
Claim 5
Dependent Claim
13 words
The coating dispersion of claim 3 wherein the silane is γ-aminopropyl triethoxy silane.
Claim 6
Dependent Claim
13 words
The coating dispersion of claim 3 wherein the silane is γ-aminopropyl trimethoxy silane.
Claim 7
Dependent Claim
15 words
The coating dispersion of claim 3 wherein the siloxane is an alkyl or alkyl/phenyl siloxane.
Claim 8
Dependent Claim
19 words
Glass fabric coated with the dispersion of claim 1, 2, 3, 4, 5 or 6, said coating being unsintered.
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) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |