US4551498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyether polyurethane prepolymers containing finely divided inorganic particles and cast elastomers made therefrom
Assignee: Bayer Corp
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Filing: 1984-05-03
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Granted: 1985-11-05
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Expires: 2004-05-03
Abstract
Abstract A novel polyether polyurethane polymer comprising the reaction product of an organic diisocyanate and a linear polyhydroxyl polyether having a molecular weight of less than 8000 and from 0.01 to 1%, by weight, of finely-divided inorganic particles is described, together with a process for producing a cast elastomer by reacting this polymer with a cross-linking or chain-extending agent.
Inventors
- 👤 Robert P. Yeater
- 👤 Richard S. Pantone
- 👤 James N. Rieck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:31
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4825; C08G18/08; C08G18/10; C08K; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
73 words
A polyether polyurethane prepolymer comprising the reaction product of an organic diisocyanate and a linear poylhydroxyl polyether, said polyhydroxyl polyether having a molecular weight of less than 8000, said diisocyanate and said polyhydroxyl polyether being reacted in an isocyanate to hydroxyl equivalent ratio of from 1.1:1 to 5:1, said prepolymer further comprising finely divided inorganic particles present in an amount of from 0.01 to 1% based on the weight of said reaction product.
Claim 2
Dependent Claim
73 words
A polyether polyurethane prepolymer comprising the reaction product of an organic diisocyanate and a linear poylhydroxyl polyether, said polyhydroxyl polyether having a molecular weight of less than 8000, said diisocyanate and said polyhydroxyl polyether being reacted in an isocyanate to hydroxyl equivalent ratio of from 1.1:1 to 5:1, said prepolymer further comprising finely divided inorganic particles present in an amount of from 0.01 to 1% based on the weight of said reaction product.
Claim 3
Dependent Claim
21 words
A prepolymer according to claim 1, characterized in that the polyhydroxyl polyether has a molecular weight of from 1000 to 4000.
Claim 4
Dependent Claim
16 words
A prepolymer according to claim 1, characterized in that said inorganic particles are fumed silica particles.
Claim 5
Dependent Claim
15 words
A prepolymer according to claim 1, wherein said equivalent ratio is from 1.5:1 to 3:1.
Claim 6
Dependent Claim
94 words
A process for producing a polyurethane elastomer by reacting a polyether polyurethane prepolymer with a cross-linking or chain-extending agent, characterized in that said prepolymer comprises the reaction product of an organic diisocyanate and a linear polyhydroxyl polyether, said polyhydroxyl polyether having a molecular weight of less than 8000, said diisocyanate and said polyhydroxyl polyether being reacted in an isocyanate to hydroxyl equivalent ratio of from 1.1:1 to 5:1, said prepolymer further comprising finely divided inorganic particles present in an amount of from 0.01 to 1%, by weight relative to the weight of the prepolymer.
Claim 7
Dependent Claim
94 words
A process for producing a polyurethane elastomer by reacting a polyether polyurethane prepolymer with a cross-linking or chain-extending agent, characterized in that said prepolymer comprises the reaction product of an organic diisocyanate and a linear polyhydroxyl polyether, said polyhydroxyl polyether having a molecular weight of less than 8000, said diisocyanate and said polyhydroxyl polyether being reacted in an isocyanate to hydroxyl equivalent ratio of from 1.1:1 to 5:1, said prepolymer further comprising finely divided inorganic particles present in an amount of from 0.01 to 1%, by weight relative to the weight of the prepolymer.
Claim 8
Dependent Claim
22 words
A process according to claim 5, characterized in that the linear polyhydroxyl polyether has a molecular weight of from 1000 to 4000.
Claim 9
Dependent Claim
16 words
A process according to claim 5, characterized in that said inorganic particles are fumed silica particles.
Claim 10
Dependent Claim
15 words
A process according to claim 5 wherein said equivalent ratio is from 1.5:1 to 3:1.
Claim 11
Dependent Claim
16 words
A process according to claim 5, characterized in that said cross-linking or chain-extending agent comprises 1,4-butanediol.
Claim 12
Dependent Claim
23 words
A process according to claim 5, characterized in that said cross-linking or chain-extending agent comprises a mixture of 1,4-butanediol and diethylated tolylene diamine.
Claim 13
Dependent Claim
104 words
A process for producing a polyurethane elastomer by reacting a polyether polyurethane prepolymer with a cross-linking or chain-extending agent, charactrized in that said prepolymer comprises the reaction product of an organic diisocyanate and a linear polyhydroxyl polyether, said polyhydroxyl polyether having a molecular weight of less than 8000, said diisocyanate and said polyhydroxyl polyether being reacted in an isocyanate to hydroxyl equivalent ratio of from 1.1:1 to 5:1, said prepolymer further comprising finely divided inorganic particles present in an amount of from 0.01 to 1%, relative to the weight of the prepolymer, said process being carried out in the absence of any organic solvents.
Claim 14
Dependent Claim
104 words
A process for producing a polyurethane elastomer by reacting a polyether polyurethane prepolymer with a cross-linking or chain-extending agent, charactrized in that said prepolymer comprises the reaction product of an organic diisocyanate and a linear polyhydroxyl polyether, said polyhydroxyl polyether having a molecular weight of less than 8000, said diisocyanate and said polyhydroxyl polyether being reacted in an isocyanate to hydroxyl equivalent ratio of from 1.1:1 to 5:1, said prepolymer further comprising finely divided inorganic particles present in an amount of from 0.01 to 1%, relative to the weight of the prepolymer, said process being carried out in the absence of any organic solvents.
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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) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |