US3637409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of flame-resistant nonwoven fabrics
Assignee: Carl Freudenberg KG
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Filing: 1968-07-30
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Granted: 1972-01-25
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Expires: 1988-07-30
Abstract
Abstract Nonwoven fabrics are impregnated first with a conventional binder and then with a polyvinyl chloride-antimony trioxide binder. After the second impregnation the fabric is longitudinally stretched while it is being dried, rewetted with water, and then transversely stretched while it is being dried. Further there is disclosed a novel impregnant composition which is useful in fireproofing nonwoven fabrics.
Inventors
- 👤 Ludwig Hartman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:05
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/645; D04H1/42; D04H1/587; D04H1/655; D04H3/00; D04H3/08; D04H3/12; D06; D06M; D06M11/00; D06M11/32; D06M11/36; D06M11/47; D06M15/00; D06M15/19; D06M15/21; D06M15/244; D06M15/263; D06M15/267; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
23 words
Process claimed in claim 1 wherein said flame retardant impregnant contains an optical brightener and a light stabilizer for the vinylidene chloride polymer.
Claim 2
Dependent Claim
28 words
Process claimed in claim 1 wherein said stretching is to an extent sufficient to impart to the final product substantially the same dimensions as the initial unimpregnated batting.
Claim 3
Dependent Claim
53 words
Process as claimed in claim 1, wherein said flame-retardant impregnant contains sufficient vinylidene chloride polymer to produce a final fabric having about 20 to 40 parts by weight of vinylidene chloride polymer to 100 parts of said conventional bonding agent and about five to 25 parts by weight per 100 parts of fiber.
Claim 4
Dependent Claim
71 words
The improved process claimed in claim 1 wherein said batting is bonded by impregnating thereinto a liquid form first bonding agent composition containing sufficient first bonding agent to provide the bonded fabric with 8 to 70 percent thereof; and drying and vulcanizing said first bonding agent containing batting, whereby bonding together said fibers predominantly at their crossing points, to form a bonded nonwoven textile fabric ready for said vinylidene chloride impregnation.
Claim 5
Dependent Claim
14 words
Process claimed in claim 5 wherein said first bonding agent is an acrylic polymer.
Claim 6
Dependent Claim
15 words
Process claimed in claim 1 wherein said bonded batting is formed of substantially continuous filaments.
Claim 7
Dependent Claim
21 words
Process as claimed in claim 7, wherein said filaments are integrally, thermally bonded together at their crossing points during batting formation.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |