US4243567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical compositions
Assignee: Smith and Nephew Research Ltd
•
Filing: 1977-12-02
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Granted: 1981-01-06
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Expires: 1997-12-02
Abstract
Abstract Cements for medical or industrial purposes contain watersoluble borate or phosphate glasses including multivalent ions e.g. zinc, aluminium or calcium and a poly (carboxylic acid) such as polyacrylic acid. As the glass dissolves ions or other reactive species crosslink the polymer.
Inventors
- 👤 William D. Potter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:52
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/07; A61L15/12; C; C03; C03C; C03C3/00; C03C3/12; C03C3/14; C03C3/145; C03C3/16; C03C3/17; C04; C04B; C04B28/00; C04B28/28; C08; C08K; C08K3/00; C08K3/40
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
76 words
A method for the production of a cement which comprises bringing into contact (a) a phosphate or borate glass containing at least one multivalent metal, said glass being present in particulate and/or fibrous form and being wholly or substantially soluble in aqueous conditions to form at least one reactive component capable of crosslinking a poly (carboxylic acid) and (b) a poly (carboxylic acid) or precursor therefor or partially crosslinked form thereof and (c) an aqueous medium.
Claim 2
Independent Claim
76 words
A method for the production of a cement which comprises bringing into contact (a) a phosphate or borate glass containing at least one multivalent metal, said glass being present in particulate and/or fibrous form and being wholly or substantially soluble in aqueous conditions to form at least one reactive component capable of crosslinking a poly (carboxylic acid) and (b) a poly (carboxylic acid) or precursor therefor or partially crosslinked form thereof and (c) an aqueous medium.
Claim 3
Dependent Claim
23 words
A method as claimed in claim 1 in which the multivalent metal is zinc, aluminium, calcium, magnesium, barium, iron, chromium, copper or vanadium.
Claim 4
Dependent Claim
20 words
A method as claimed in claim 2 in which the glass is a two-component B 2 O 3 --ZnO glass.
Claim 5
Dependent Claim
23 words
A method as claimed in claim 2 in which the glass is a three-component B 2 O 3 --ZnO--Al 2 O 3 glass.
Claim 6
Dependent Claim
35 words
A method as claimed in claim 3 in which the glass contains 35-50 mole percent of B 2 O 3 , 0-15 mole percent of Al 2 O 3 and 10-65 mole percent of ZnO.
Claim 7
Dependent Claim
35 words
A method as claimed in claim 5 in which the glass contains, 35-50 mole percent of B 2 O 3 , 0-5 mole percent of Al 2 O 3 and 35-65 mole percent of ZnO.
Claim 8
Dependent Claim
20 words
A method as claimed in claim 2 in which the glass is a two-component P 2 O 5 --ZnO glass.
Claim 9
Dependent Claim
23 words
A method as claimed in claim 2 in which the glass is a three-component P 2 O 5 --ZnO--Al 2 O 3 glass.
Claim 10
Dependent Claim
28 words
A method as claimed in claim 1 in which the glass is in the form of generally spherical particles all of a maximum dimension less than 250 microns.
Claim 11
Dependent Claim
16 words
A method as claimed in claim 9 in which the said maximum dimension is 75 microns.
Claim 12
Dependent Claim
63 words
A method as claimed in claim 1 in which the poly (carboxylic acid) or its precursor is chosen from unsaturated monocarboxylic acids and their anhydrides, and unsaturated dicarboxylic acids and their anhydrides, being homopolymers of any one of these, copolymers between any two or more of these or copolymers between one or more of these and one or more further ethylenically unsaturated monomers.
Claim 13
Dependent Claim
26 words
A method as claimed in claim 11 in which the poly (carboxylic acid) or its precursor is a polymer of acrylic acid or acrylic acid anhydride.
Claim 14
Dependent Claim
28 words
A method as claimed in claim 11 in which the number average molecular weight of the said poly (carboxylic acid) or its precursor is from 1000 to 1000000.
Claim 15
Dependent Claim
24 words
A method as claimed in claim 1 in which the partially crosslinked form of the poly (carboxylic acid) is partially crosslinked with diallyl sucrose.
Claim 16
Dependent Claim
63 words
A curable composition comprising (a) a phosphate or borate glass containing at least one multivalent metal, said glass being present in particulate and/or fibrous form and being wholly or substantially soluble in aqueous conditions to form at least one reactive component capable of crosslinking a poly (carboxylic acid) together with (b) a poly (carboxylic acid) or precursor therefor or partially crosslinked form thereof.
Claim 17
Dependent Claim
63 words
A curable composition comprising (a) a phosphate or borate glass containing at least one multivalent metal, said glass being present in particulate and/or fibrous form and being wholly or substantially soluble in aqueous conditions to form at least one reactive component capable of crosslinking a poly (carboxylic acid) together with (b) a poly (carboxylic acid) or precursor therefor or partially crosslinked form thereof.
Claim 18
Dependent Claim
30 words
A curable composition as claimed in claim 15 in which the glass component is one comprising a multivalent metal of zinc, aluminum, calcium, magnesium, barium, iron, chromium, copper or vanadium.
Claim 19
Dependent Claim
68 words
A curable composition as claimed in claim 15 in which the poly (carboxylic acid) or precursor or partially cross-linked form thereof is chosen from unsaturated monocarboxylic acids and their anhydrides, and unsaturated dicarboxylic acids and their anhydrides, being homopolymers of any one of these, copolymers between any two or more of these or copolymers between one or more of these and one or more further ethylenically unsaturated monomers.
Claim 20
Dependent Claim
32 words
A curable composition as claimed in claim 16 further including from 5 to 50 percent by total weight of a water-insoluble finely divided particulate inorganic filler of particle size below 250 microns.
Claim 21
Dependent Claim
37 words
A curable composition as claimed in claim 15 further including from 5 to 50 percent by total weight of a water insoluble fibrous inorganic filler of fibre diameter below 250 microns and fibre length below 3 mm.
Claim 22
Dependent Claim
23 words
A curable composition as claimed in claim 15, comprising an intimate particulate mixture of particles of glass (a) and particles of polymer (b).
Claim 23
Dependent Claim
32 words
A curable composition as claimed in claim 20 further including from 5 to 50 percent by total weight of a water-insoluble finely divided particulate inorganic filler of particle size below 250 microns.
Claim 24
Dependent Claim
36 words
A curable composition as claimed in claim 20 further including from 5 to 50 percent by total weight of a water-insoluble fibrous inorganic filler of fibre diameter below 250 microns and fibre length below 3 mm.
Claim 25
Dependent Claim
25 words
A curable composition as claimed in claim 20, in which the weight ratio between the glass (a) and polymer (b) is from 1:1 to 3:1.
Claim 26
Dependent Claim
23 words
A curable composition as claimed in claim 20 in which the particles of polymer (b) are of less than 150 microns particle size.
Claim 27
Dependent Claim
26 words
A curable composition as claimed in claim 20 which contains mixed therewith up to 20% by weight based on polymer (b) of a particulate hydroxycarboxylic acid.
Claim 28
Dependent Claim
29 words
A curable composition as claimed in claim 25 in which the hydroxycarboxylic acid is tartaric acid present in an amount of 5 to 15% by weight of polymer (b).
Claim 29
Dependent Claim
22 words
A curable composition as claimed in claim 20 further containing up to 5% by weight of dry particulate sodium chloride mixed therewith.
Claim 30
Dependent Claim
27 words
A curable composition as claimed in claim 20 associated with a substrate in the form of a flexible carrier which is porous or otherwise provided with interstices.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |