Patent US6454766B1 successfully refreshed from Google Patents.
US3607822A
Expired / Lapsed
US
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Thixotropical polyurethane compositions
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1968-03-18
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Granted: 1971-09-21
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Expires: 1988-03-18
Abstract
Abstract A thixotropical polyurethane composition comprising 100 weight parts of a polyurethane prepolymer, 0.1 to 50 weight parts of colloidal silica of an average particle size of 3 to 50 Mu 0.001 to 50 weight parts of at least one ethylene glycol polymer, having an average molecular weight of 100 to 20,000, of the group consisting of polyethylene glycol, polyethylene glycol ether and polyethylene glycol ester; the weight ratio of said ethylene glycol polymer to said colloidal silica being in the range of between 0.05:1 and 0.5:1.
Inventors
- 👤 Kenichi Nishino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:45
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C09; C09D; C09D175/00; C09D175/04; Y; Y10; Y10S; Y10S524/00; Y10S524/914
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
25 words
The thixotropical polyurethane composition according to claim 1, in which said colloidal silica has an average particle size of 5 to 40 m Mu .
Claim 2
Dependent Claim
30 words
The thixotropical polyurethane composition according to claim 1, in which said weight of the polyethylene glycol polymer to the colloidal silica is in the range of between 0.1:1 and 0.3:1.
Claim 3
Dependent Claim
16 words
The thixotropic polyurethane composition according to claim 2, wherein said prepolymer is terminated with NCO groups.
Claim 4
Dependent Claim
33 words
The thixotropic polyurethane composition according to claim 2, in which said colloidal silica is contained in the range of 0.5 to 20 weight parts, based on 100 weight parts of the polyurethane prepolymer.
Claim 5
Dependent Claim
49 words
The thixotropic polyurethane composition according to claim 1, in which said colloidal silica is contained in the range of 0.5 to 20 weight parts and said ethylene glycol polymer is contained in the range of 0.05 to 10 weight parts, based on 100 weight parts of the polyurethane prepolymer.
Claim 6
Dependent Claim
49 words
The thixotropic polyurethane composition according to claim 1, in which said colloidal silica is contained in the range of 3 to 5 weight parts and said ethylene glycol polymer is contained in the range of 0.01 to 1 weight part, based on 100 weight parts of the polyurethane prepolymer.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |