US4016124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cements comprising acrylic acid/itaconic acid copolymer and fluoroaluminosilicate glass powder
Assignee: BTG International Ltd
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Filing: 1974-08-15
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Granted: 1977-04-05
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Expires: 1994-08-15
Abstract
Abstract A cement-forming liquid suitable for use as a component of a poly(carboxylate) cement comprises an aqueous solution of a copolymer of acrylic acid, the copolymer having an average molecular weight of less than 20,000, and the solution having a viscosity of less than 50 poise.
Inventors
- 👤 Stephen Crisp
- 👤 Alan Donald Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:03
CPC Classifications
C; C08; C08L; C08L33/00; C08L33/02; A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; A61K6/889; C04; C04B; C04B28/00; C04B28/28; Y; Y10; Y10S; Y10S526/00; Y10S526/936
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
80 words
A poly(carboxylate) cement pack comprising as one component a water-soluble copolymer of acrylic acid and itaconic acid, the mole ratio of acrylic acid to itaconic acid in the copolymer being from 19:1 to 2:1, the copolymer having an average molecular weight of from 5,000 to 19,000 and as another component a fluoroaluminosilicate glass powder which will react with the acrylic acid-itaconic acid copolymer in the presence of water to give a plastic mass which hardens to form a poly(carboxylate) cement.
Claim 2
Dependent Claim
80 words
A poly(carboxylate) cement pack comprising as one component a water-soluble copolymer of acrylic acid and itaconic acid, the mole ratio of acrylic acid to itaconic acid in the copolymer being from 19:1 to 2:1, the copolymer having an average molecular weight of from 5,000 to 19,000 and as another component a fluoroaluminosilicate glass powder which will react with the acrylic acid-itaconic acid copolymer in the presence of water to give a plastic mass which hardens to form a poly(carboxylate) cement.
Claim 3
Dependent Claim
45 words
A cement pack according to claim 1, in which the copolymer is in the form of an aqueous solution containing from 20% to 65% by weight of the acrylic acid-itaconic acid copolymer and having a viscosity as hereinbefore defined of from 5 to 40 poise.
Claim 4
Dependent Claim
40 words
A cement pack according to claim 1, that comprises from 15% to 85% by weight of the fluoroaluminosilicate glass powder, from 3% to 50% by weight of the acrylic acid copolymer and from 5% to 70% by weight of water.
Claim 5
Dependent Claim
23 words
A cement pack according to claim 2, in which the weight ratio of fluoroaluminosilicate glass powder to liquid is from 0.5:1 to 5:1.
Claim 6
Dependent Claim
14 words
A cement pack according to claim 1, that comprises a water soluble chelating agent.
Claim 7
Dependent Claim
30 words
A cement pack according to claim 1, in which the degree of fineness of the fluoroaluminosilicate glass powder is such that it will pass through a 150 mesh B.S. sieve.
Claim 8
Dependent Claim
92 words
A process for the preparation of a poly(carboxylate) cement which comprises mixing a water-soluble copolymer of acrylic acid and itaconic acid, the mole ratio of acrylic acid to itaconic acid in the copolymer being from 19:1 to 2:1, the copolymer having an average molecular weight of from 5,000 to 19,000, with a fluoroaluminosilicate glass powder which will react with the acrylic acid-itaconic acid copolymer in the presence of water to give a mass that remains plastic long enough to be formed into a desired shape prior to hardening as a poly(carboxylate) cement.
Claim 9
Dependent Claim
92 words
A process for the preparation of a poly(carboxylate) cement which comprises mixing a water-soluble copolymer of acrylic acid and itaconic acid, the mole ratio of acrylic acid to itaconic acid in the copolymer being from 19:1 to 2:1, the copolymer having an average molecular weight of from 5,000 to 19,000, with a fluoroaluminosilicate glass powder which will react with the acrylic acid-itaconic acid copolymer in the presence of water to give a mass that remains plastic long enough to be formed into a desired shape prior to hardening as a poly(carboxylate) cement.
Claim 10
Dependent Claim
44 words
A process according to claim 7, in which the copolymer is in the form of an aqueous solution containing from 20% to 65% by weight of the acrylic acid-itaconic acid copolymer and having a viscosity as hereinbefore defined of from 5 to 40 poise.
Claim 11
Dependent Claim
19 words
A process according to claim 7, that is carried out in the presence of a water soluble chelating agent.
Claim 12
Dependent Claim
28 words
A process according to claim 7, in which the fluoroaluminosilicate glass powder has a degree of fineness such that it will pass through a 150 mesh B.S. sieve.
Claim 13
Dependent Claim
26 words
A process according to claim 8, in which the powder and liquid components are mixed in a powder to liquid ratio of from 1:1 to 4:1.
Claim 14
Dependent Claim
58 words
A poly(carboxylate) cement consisting essentially of the reaction product of the reaction between a copolymer of acrylic acid and itaconic acid, having an average molecular weight of from 5,000 to 19,000, and a fluoroaluminosilicate glass powder in the presence of water, the mole ratio of acrylic acid to itaconic acid in the copolymer being from 19:1 to 2:1.
Claim 15
Dependent Claim
58 words
A poly(carboxylate) cement consisting essentially of the reaction product of the reaction between a copolymer of acrylic acid and itaconic acid, having an average molecular weight of from 5,000 to 19,000, and a fluoroaluminosilicate glass powder in the presence of water, the mole ratio of acrylic acid to itaconic acid in the copolymer being from 19:1 to 2:1.
Claim 16
Dependent Claim
45 words
The poly(carboxylate) cement according to claim 12, in which the copolymer is in the form of an aqueous solution containing from 20% to 65% by weight of the acrylic acid-itaconic acid copolymer and having a viscosity as hereinbefore defined of from 5 to 40 poise.
Claim 17
Dependent Claim
23 words
The poly(carboxylate) cement according to claim 12, in which the weight ratio of floroaluminosilicate glass powder to liquid is from 0.5:1 to 5:1.
Claim 18
Dependent Claim
20 words
The poly(carboxylate) cement according to claim 12, wherein sad reaction is carried out in the presence of a chelating agent.
Claim 19
Dependent Claim
29 words
The poly(carboxylate) cement according to claim 12, in which the fluoroaluminosilicate glass powder has a degree of fineness such that it will pass through a 150 mesh B.S. sieve.
Claim 20
Dependent Claim
27 words
The poly(carboxylate) cement according to claim 12, in which the powder and liquid components are mixed in a powder to liquid ratio of from 1:1 to 4:1.
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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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |