US4049870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backcoating of polypropylene fabric
Assignee: PPG Industries Inc
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Filing: 1975-12-22
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Granted: 1977-09-20
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Expires: 1995-12-22
Abstract
Abstract Backcoated polypropylene fabric is prepared by applying to one side of polypropylene fabric a backcoating composition of poly(vinyl chloride/vinylidene chloride) copolymer in 1,1,1-trichloroethane solvent and subsequently vaporizing the solvent from the fabric.
Inventors
- 👤 George Brodmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:38
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/04; D06N3/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/31587; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/3192; Y10T428/31938; Y10T442/00; Y10T442/20; Y10T442/2369; Y10T442/2861; Y10T442/291; Y10T442/2918
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A method of backcoating polypropylene fabric by applying to one surface of the fabric a backcoating composition comprising polymer and solvent, said polymer being a solid high molecular weight 1,1,1-trichloroethane soluble polymer containing at least 50 weight percent of poly(vinyl chloride/vinylidene chloride) copolymer and said solvent consisting essentially of 1,1,1-trichloroethane; thereafter, affixing the polymer by volatilizing the solvent from the fabric.
Claim 2
Independent Claim
61 words
A method of backcoating polypropylene fabric by applying to one surface of the fabric a backcoating composition comprising polymer and solvent, said polymer being a solid high molecular weight 1,1,1-trichloroethane soluble polymer containing at least 50 weight percent of poly(vinyl chloride/vinylidene chloride) copolymer and said solvent consisting essentially of 1,1,1-trichloroethane; thereafter, affixing the polymer by volatilizing the solvent from the fabric.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein the solvent is volatilized at a temperature above 50° C.
Claim 4
Dependent Claim
50 words
A method according to claim 1 wherein the polymer consists essentially of 65 to 85 weight percent based on the total weight of polymer of a poly(vinyl chloride/vinylidene chloride) bipolymer having 20 to 80 mole percent vinylidene chloride, said bipolymer being admixed with 10 to 40 percent of polyurethane polymer.
Claim 5
Dependent Claim
33 words
The method of claim 1 wherein the sequence of applying backcoating composition and volatilizing solvent is repeated until 10 to 150 weight percent of polymer based on the weight of fabric is applied.
Claim 6
Dependent Claim
37 words
A polypropylene fabric coated on one surface with between 10 to 150 percent by weight of fabric of a solid high molecular weight 1,1,1-trichloroethane soluble polymer, said fabric prepared in accordance with the method of claim 3.
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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |