Patent US4240950A successfully refreshed from Google Patents.
US4240950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized filler suspensions in polyols
Assignee: Bayer AG
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Filing: 1979-07-30
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Granted: 1980-12-23
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Expires: 1999-07-30
Abstract
Abstract The instant invention is directed to a process for the production of non-disintegrating suspensions of inorganic fillers in polyhydroxyl compounds of the type used for the production of polyurethanes, comprising reacting a suspension of an inorganic filler in a polyhydroxyl compound with from 0.1 to 2%, by weight, of a polyisocyanate, based on the weight of the suspension, at a temperature of from 30° to 200° C. The invention is also directed to the use of the suspension as the polyol component in the production of cellular polyurethane plastics.
Inventors
- 👤 Wulf von Bonin
- 👤 Peter Vehlewald
- 👤 Hans-Walter Illger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:47
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08K; C08K3/00; C08K3/01; C08K3/013; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
A process for the production of non-disintegrating suspensions of inorganic fillers in polyhydroxyl compounds of the type used for the production of polyurethanes, comprising reacting a suspension of an inorganic filler in a polyhydroxyl compound with from 0.1 to 2%, by weight, of a polyisocyanate, based on the weight of the suspension, at a temperature of from 30° to 200° C.
Claim 2
Dependent Claim
61 words
A process for the production of non-disintegrating suspensions of inorganic fillers in polyhydroxyl compounds of the type used for the production of polyurethanes, comprising reacting a suspension of an inorganic filler in a polyhydroxyl compound with from 0.1 to 2%, by weight, of a polyisocyanate, based on the weight of the suspension, at a temperature of from 30° to 200° C.
Claim 3
Dependent Claim
31 words
The process of claim 1, wherein said suspension comprises 5 to 75%, by weight, of an inorganic filler in a polyhydroxy polyether having a molecular weight of from 500 to 10,000.
Claim 4
Dependent Claim
15 words
The process of claim 1, wherein the reaction temperature is from 100° to 150° C.
Claim 5
Dependent Claim
10 words
The process of claim 2, wherein said polyisocyanate is diisocyanate.
Claim 6
Dependent Claim
39 words
The process of claim 1, wherein said suspension contains 20 to 50%, by weight, of chalk powder having a particle size of less than 10 μm in a polyhydroxy polyether having a molecular weight of from 1,000 to 7,000.
Claim 7
Dependent Claim
35 words
The process of claim 1, wherein in a first step said polyhydroxyl compound is mixed with said polyisocyanate, subsequently said inorganic filler is stirred in and then the mixture is heated to the reaction temperature.
References Cited (Backward Citations)
US3869413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |