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US4035529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating the back of a textile floor covering with a polyurethane foam
Assignee: Bayer AG
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Filing: 1975-08-07
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Granted: 1977-07-12
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Expires: 1995-08-07
Abstract
Abstract The instant invention relates to a process for coating the back of textile floor coverings, e.g. carpets, with polyurethane foams wherein it is possible to obtain particularly firm fixing of the nap and improved anchorage of the textile filaments. The process broadly comprises: A. applying to the back of a textile floor covering a first coat consisting essentially of a reacting foamable mixture of a polyol and a large excess of polyisocyanate, B. before said first coat has been hardened, applying thereto reacting foamable mixture of substantially equivalent quantities of polyol and polyisocyanate, and C. thereafter hardening the resultant product.
Inventors
- 👤 Ernst Meisert
- 👤 Klaus Recker
- 👤 Gerhard Grogler
- 👤 Cornelius Muhlhausen
- 👤 Gerd Reinecke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:55
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; B; B32; B32B; B32B5/00; B32B5/18; B32B5/20; B29; B29C; B29C44/00; B29C44/20; B29C44/32; B29C44/321; B32B5/22; B32B5/24; B32B5/245; B32B5/32; D; D06; D06N; D06N7/00; D06N7/0063; D06N7/0071; D06N7/0086; B29L; B29L2007/00; B29L2009/00; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2471/00; B32B2471/02; C08J2375/00; C08J2375/04; D06N2203/00; D06N2203/06; D06N2203/068; D06N2205/00; D06N2205/04; D06N2213/00; D06N2213/06; D06N2213/065; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23979; Y10T428/249921; Y10T428/249953; Y10T428/249987
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
A process for coating the back of a textile floor covering with a polyurethane foam comprising: (a) applying a reacting foamable or reacting prefoamed mixture of a polyol and a polyisocyanate directly to the back of said textile floor covering, the NCO to OH equivalent ratio in said reacting foamable or reacting prefoamed mixture being from 1.5:1 to 3.5:1; (b) applying to said reacting foamable or reacting prefoamed mixture before said reacting foamable or reacting prefoamed mixture has fully reacted a second reacting foamable or reacting prefoamed mixture of a polyol and a polyisocyanate, the NCO to OH equivalent ratio in said second mixture being from 0.95:1 to 1.25:1; and (c) allowing the composite material of step (b) to harden, thereby forming said foam coating.
Claim 2
Dependent Claim
125 words
A process for coating the back of a textile floor covering with a polyurethane foam comprising: (a) applying a reacting foamable or reacting prefoamed mixture of a polyol and a polyisocyanate directly to the back of said textile floor covering, the NCO to OH equivalent ratio in said reacting foamable or reacting prefoamed mixture being from 1.5:1 to 3.5:1; (b) applying to said reacting foamable or reacting prefoamed mixture before said reacting foamable or reacting prefoamed mixture has fully reacted a second reacting foamable or reacting prefoamed mixture of a polyol and a polyisocyanate, the NCO to OH equivalent ratio in said second mixture being from 0.95:1 to 1.25:1; and (c) allowing the composite material of step (b) to harden, thereby forming said foam coating.
Claim 3
Dependent Claim
18 words
The process of claim 1, wherein said second mixture is prefoamed prior to application to the first mixture.
Claim 4
Dependent Claim
14 words
The process of claim 1, wherein the same materials are used in both layers.
Claim 5
Dependent Claim
14 words
The process of claim 1, wherein step (c) comprises hardening in a heated zone.
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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |