US4483900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polytetrafluorethylene-polyurethane coated fabric
Assignee: OAKWOOD INDUSTRIES Inc 380 OAKWOOD ROAD HUNTINGTON ST NEW YORK 11746 A CORP OF
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Filing: 1982-07-15
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Granted: 1984-11-20
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Expires: 2002-07-15
Abstract
Abstract A fabric is produced by coating a synthetic substrate fabric with a milled combination of 75 parts fully reacted polyurethane and 25 parts polytetrafluorethylene (PTFE), which product fabric has a large plurality of pores of about 0.2-0.3 microns, and provides high levels of thermal and vapor transmission through the fabric while being highly water repellent. The present fabric is useful in a single ply application for a wide range of apparel and camping goods.
Inventors
- 👤 Ralph Goldfarb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:28
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; D06N3/142; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31551; Y10T442/00; Y10T442/20; Y10T442/2139; Y10T442/2148; Y10T442/2164; Y10T442/2189
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
64 words
A coated fabric comprising a base fabric having a coating comprising a composition comprising the combination of polyurethane and polytetrafluoroethylene (PTFE) and a polymeric suspension agent, wherein the polyurethane is present in a predominant amount on a dry weight basis, said coated fabric having pores so as to repel water droplets while transmitting water vapor so as to be both water repellent and breathable.
Claim 2
Dependent Claim
64 words
A coated fabric comprising a base fabric having a coating comprising a composition comprising the combination of polyurethane and polytetrafluoroethylene (PTFE) and a polymeric suspension agent, wherein the polyurethane is present in a predominant amount on a dry weight basis, said coated fabric having pores so as to repel water droplets while transmitting water vapor so as to be both water repellent and breathable.
Claim 3
Dependent Claim
17 words
The fabric of claim 1, wherein the coated fabric comprises pores of about 0.1 to 0.5 microns.
Claim 4
Dependent Claim
18 words
The fabric of claim 2, wherein the polyurethane to PTFE weight ratio is from about 2:1 to 4:1.
Claim 5
Dependent Claim
17 words
The fabric of claim 3, wherein the coating is from about 1 to 3 mils in thickness.
Claim 6
Dependent Claim
34 words
The fabric of claim 4, wherein the coated fabric consists of a single fabric ply, and repels water droplets while transmitting water vapor there through so as to be both water repellent and breathable.
Claim 7
Dependent Claim
14 words
The fabric of claim 5, wherein the polyurethane to PTFE ratio is about 3:1.
Claim 8
Dependent Claim
15 words
The fabric of claim 6, wherein the pore size range is from about 0.2-0.3 microns.
Claim 9
Dependent Claim
25 words
The fabric of claim 7, said polymeric suspension agent being one selected from a polyamino-amide, a high molecular weight acid ester and a polycarboxylic acid.
Claim 10
Dependent Claim
53 words
A composition for coating a fabric sheet comprising: ______________________________________
Component Parts by Weight (Range)
______________________________________
polyurethane (solids)
10-20
polytetrafluorethylene (solids)
3-8
polymeric suspension agent
1-5
organic solvent 20-50
______________________________________ said coated fabric having pores so as to repel water droplets while transmitting water vapor so as to be both water repellent and breathable.
Claim 11
Dependent Claim
53 words
A composition for coating a fabric sheet comprising: ______________________________________
Component Parts by Weight (Range)
______________________________________
polyurethane (solids)
10-20
polytetrafluorethylene (solids)
3-8
polymeric suspension agent
1-5
organic solvent 20-50
______________________________________ said coated fabric having pores so as to repel water droplets while transmitting water vapor so as to be both water repellent and breathable.
Claim 12
Dependent Claim
38 words
The formulation of claim 1, said suspension agent comprising at least one selected from a long chain polyamino-acide high molecular weight acid ester and a polycarboxylic acid, said selected agent having a molecular weight of 500 to 1,500.
Claim 13
Dependent Claim
11 words
The formulation of claim 10, wherein the polyurethane is fully reacted.
Claim 14
Dependent Claim
11 words
The formulation of claim 11, further comprising an isocyanate bonding agent.
Claim 15
Dependent Claim
18 words
The formulation of claim 12, wherein the polytetrafluorethylene solids are suspended in and dispersed between the polyurethane solids.
Claim 16
Independent Claim
83 words
A method for making a coated fabric comprising; (a) combining a formulation comprising; ______________________________________
Component Parts by weight (range)
______________________________________
polyurethane (solids)
10-20
polytetrafluorethylene (solids)
3-8
polymeric suspension agent
1-5
organic solvent 20-50
______________________________________ (b) coating a layer of the step (a) formulation on a substrate web; and (c) evaporating the solvent from the coated layer to form a coated fabric having pores so as to repel water droplets while transmitting water vapor thereto so as to be both water repellent and breathable.
Claim 17
Independent Claim
83 words
A method for making a coated fabric comprising; (a) combining a formulation comprising; ______________________________________
Component Parts by weight (range)
______________________________________
polyurethane (solids)
10-20
polytetrafluorethylene (solids)
3-8
polymeric suspension agent
1-5
organic solvent 20-50
______________________________________ (b) coating a layer of the step (a) formulation on a substrate web; and (c) evaporating the solvent from the coated layer to form a coated fabric having pores so as to repel water droplets while transmitting water vapor thereto so as to be both water repellent and breathable.
Claim 18
Dependent Claim
14 words
The method of claim 14, wherein step (a) is by milling or high shearing.
Claim 19
Dependent Claim
19 words
The method of claim 14, wherein the product of step (a) is at least 7+ on a Hegman gauge.
Claim 20
Dependent Claim
20 words
The method of claim 14, wherein the formulation during step (a) is maintained at a temperature below about 70° C.
Claim 21
Dependent Claim
15 words
The method of claim 14, further comprising cooling after step (a) and before step (b).
Claim 22
Dependent Claim
22 words
The method of claim 18, wherein the evaporating is step-wise between about 50° C. and 120 C., for about 2 minutes overall.
Claim 23
Dependent Claim
17 words
The method of claim 19, wherein the coated fabric comprises pores of about 0.1 to 0.5 microns.
Claim 24
Dependent Claim
16 words
The method of claim 20, wherein the coating is about 1 to 3 mils in thickness.
Claim 25
Dependent Claim
14 words
The method of claim 21, wherein the polyurethane to PTFE ratio is about 3:1.
Claim 26
Dependent Claim
15 words
The method of claim 22, wherein the pore size range is from about 0.2-0.3 microns.
Claim 27
Dependent Claim
11 words
The method of claim 23, wherein the polyurethane is fully reacted.
Claim 28
Dependent Claim
11 words
The method of claim 14, wherein the polyurethane is fully reacted.
Claim 29
Dependent Claim
12 words
The method of claim 25, further comprising an isocyanate substrate bonding agent.
Claim 30
Dependent Claim
18 words
The method of claim 26, wherein the polytetrafluorethylene solids are suspended in and dispersed between the polyurethane solids.
Claim 31
Dependent Claim
15 words
The method of claim 27, wherein the pore size range is from about 0.2-0.3 microns.
Claim 32
Dependent Claim
40 words
The method of claim 28, wherein said suspension agent comprising at least one selected from a long chain polyamino-acid, a high molecular weight acid ester and a polycarboxylic acid, said selected agent having a molecular weight of 500 to 1,500.
Claim 33
Dependent Claim
18 words
The method of claim 29, further comprising cooling the combined formulation to about 25° C. prior to coating.
References Cited (Backward Citations)
US2976257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |