US4271057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water setting ion-polymer cements
Assignee: International Standard Electric Corp
•
Filing: 1979-11-06
•
Granted: 1981-06-02
•
Expires: 1999-11-06
Abstract
Abstract In a water soluble glass composition for effecting cross-linking of a polycarboxylic acid cement, typically polyacrylic acid, the glass is treated with phosphorus pentoxide or a phosphate containing material. This inhibits the initial setting stage of the cement and thus prolongs the period within which the cement can be worked. The glass may be of the zinc oxide/boric oxide/alumina type or of the fluoroaluminoborosilicate type.
Inventors
- 👤 Cyril F. Drake
- 👤 Neil R. Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:54
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/40; A61L27/44; A61L27/46; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; A61K6/889; A61L15/00; A61L15/07; A61L15/12; C; C03; C03C; C03C17/00; C03C17/22; C03C3/00; C03C3/12; C03C3/14; C03C3/145; C03C3/23; C03C4/00; C03C4/0035; C04; C04B; C04B28/00; C04B28/28; C08; C08K; C08K3/00; C08K3/40; C03C2217/00; C03C2217/20; C03C2217/28; C03C2218/00; C03C2218/10; C03C2218/11; Y; Y10; Y10S; Y10S528/00; Y10S528/92
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
104 words
A method of controlling the setting characteristics of an aqueous polycarboxylic acid cement mixture, the cross-linking agent comprising or being provided by a crushed glass composition selected from the group consisting of zinc oxide/boric oxide/alumina and fluoroaluminoborosilicate, the method including incorporating in said mixture a phosphate material by treating the surface of said crushed glass with sufficient phosphorus pentoxide in vapor phase or coating the surface of said crushed glass with sufficient alkaline metal phosphate salt selected from the group consisting of orthophosphate, metaphosphate, pyrophosphate and polyphosphate so as to extend the working time without substantially extending the setting time of the acid material.
Claim 2
Independent Claim
104 words
A method of controlling the setting characteristics of an aqueous polycarboxylic acid cement mixture, the cross-linking agent comprising or being provided by a crushed glass composition selected from the group consisting of zinc oxide/boric oxide/alumina and fluoroaluminoborosilicate, the method including incorporating in said mixture a phosphate material by treating the surface of said crushed glass with sufficient phosphorus pentoxide in vapor phase or coating the surface of said crushed glass with sufficient alkaline metal phosphate salt selected from the group consisting of orthophosphate, metaphosphate, pyrophosphate and polyphosphate so as to extend the working time without substantially extending the setting time of the acid material.
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1 wherein said glass incorporates as a glass modifying oxide calcium oxide, magnesium oxide, zirconium oxide, titanium oxide or mixtures thereof.
Claim 4
Dependent Claim
13 words
A method as claimed in claim 2 wherein the oxide is titanium oxide.
Claim 5
Independent Claim
28 words
A method as claimed in any one of claims 1, 2 or 3, in which said glass is treated by being exposed to phosphorus pentoxide in vapor phase.
Claim 6
Independent Claim
27 words
A method as claimed in any one of claims 1, 2 or 3, in which said glass is coated with a phosphate salt from an aqueous solution.
Claim 7
Dependent Claim
15 words
A method as claimed in claim 5, in which said phosphate is an ammonium phosphate.
Claim 8
Independent Claim
28 words
A method as claimed in any one of claims 1, 2 or 3, in which said glass is coated with a solid phosphate salt from a liquid slurry.
References Cited (Backward Citations)
US3814717A
Cited
US3962267A
Cited
US4143018A
Cited
US4123416A
Cited
US4166744A
Cited
US4174334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-01 | 1984-12-01 | 1985-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-01 | 1988-12-01 | 1989-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-01 | 1992-12-01 | 1993-06-02 | $7700.00 | Window Closed / Lapsed |