US4544683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inorganic-organic fixed-dressings and a process for their production
Assignee: Bayer AG
•
Filing: 1984-05-18
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Granted: 1985-10-01
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Expires: 2004-05-18
Abstract
Abstract A process for producing an inorganic-organic composition material based on gypsum and polyurethane comprising exposing calcined gypsum or anhydrite to the action of water in the presence of a polyurethane or polyurethane-urea which is dispersible in water and in the presence of up to about 20% by weight (relative to the total mixture) of an alcohol and up to about 20% by weight (relative to the total mixture) of another organic solvent, and allowing the composition to set while permitting any solvents which may be present to evaporate. The calcium sulphate may be on a textile support or the composition may be molded into flexible shaped articles of good mechanical properties.
Inventors
- 👤 Peter Muller
- 👤 Kuno Wagner
- 👤 Christian Wegner
- 👤 Peter Schwabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:45
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/28; C04B24/282; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
105 words
A process for producing an inorganic-organic fixed dressings based on gypsum and polyurethane comprising contacting a textile support carrying calcined gypsum or anhydrite with an aqueous dispersion of a polyurethane or polyurethane-urea which dispersion contains up to about 20% by weight (relative to the total mixture) of an alcohol and up to about 20% by weight (relative to the total mixture) of another organic solvent, each 100 grams of polyurethane or polyurethane-urea having about 0.1-130 milli-equivalents of ionic groups or of groups which can be converted into ionic groups, and allowing the composition to set while permitting any solvents which may be present to evaporate.
Claim 2
Dependent Claim
105 words
A process for producing an inorganic-organic fixed dressings based on gypsum and polyurethane comprising contacting a textile support carrying calcined gypsum or anhydrite with an aqueous dispersion of a polyurethane or polyurethane-urea which dispersion contains up to about 20% by weight (relative to the total mixture) of an alcohol and up to about 20% by weight (relative to the total mixture) of another organic solvent, each 100 grams of polyurethane or polyurethane-urea having about 0.1-130 milli-equivalents of ionic groups or of groups which can be converted into ionic groups, and allowing the composition to set while permitting any solvents which may be present to evaporate.
Claim 3
Dependent Claim
26 words
A process according to claim 1, wherein the polyurethane or polyurethane-urea is present in about 1 to 50% by weight of polyurethane or polyurethane-urea plus gypsum.
Claim 4
Dependent Claim
25 words
A process according to claim 1, wherein the polyurethane or polyurethane-urea is present in about 5 45% by weight of polyurethane or polyurethane-urea plus gypsum.
Claim 5
Dependent Claim
23 words
A process according to claim 1, hwerein the aqueous dispersion has a polyurethane or polyurethane-urea content of about 1 to 60% by weight.
Claim 6
Dependent Claim
23 words
A process according to claim 1, wherein the aqueous dispersion has a polyurethane or polyurethane-urea content of about 5 to 50% by weight.
Claim 7
Dependent Claim
31 words
A process according to claim 1, wherein the polyurethane or polyurethane-urea is one which on drying out forms a non-adhesive film having an indentation hardness below about 1,400 Kp/cm 2 .
Claim 8
Dependent Claim
25 words
A process according to claim 1, wherein about 2 to 20% by weight of the polyurethane or polyurethane-urea comprises ethylene oxide units in polyether chains.
Claim 9
Dependent Claim
25 words
A process according to claim 1, wherein about 8 to 16% by weight of the polyurethane or polyurethane-urea comprises ethylene oxide units in polyether chains.
Claim 10
Dependent Claim
19 words
A process according to claim 1, wherein the gypsum is present in about twice the weight of a polyurethane.
Claim 11
Dependent Claim
19 words
A process according to claim 1, wherein the gypsum is present in about twice the weight of a polyurethane-urea.
Claim 12
Dependent Claim
18 words
A process according to claim 1, wherein the gypsum is present in about equal weight of a polyurethane.
Claim 13
Dependent Claim
53 words
A process according to claim 1, wherein about 0.5 to 10% by weight of the polyurethane or polyurethane-urea ccmprises ethylene oxide units in polyether chains, and wherein each 100 grams of polyurethane or polyurethane-urea has about 0.1 to 40 milliequivalents of ionic groups or of groups which can be converted into ionic groups.
Claim 14
Dependent Claim
9 words
A product produced by the process of claim 1.
Claim 15
Dependent Claim
9 words
A product produced by the process of claim 6.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |