US4911759A
Expired / Lapsed
US
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Dental gypsum compositions in low-dusting powdery form
Assignee: GC Corp
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Filing: 1988-08-18
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Granted: 1990-03-27
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Expires: 2008-08-18
Abstract
Abstract A dental gypsum composition in the low-dusting powdery form contains (a) hemihydrate gypsum, (b) a setting controlled agent comprising one or more of setting accelerators, setting retarders and setting expansion inhibitors, (c) one or more wetting agents selected from the group consisting of liquid hydrophobic hydrocarbons, liquid hydrophobic fatty acid esters and liquid hydrophobic fatty acids showing a vapor pressure of 3.15 mmHg or below at 20 DEG C., and (d) one or more anionic surface active agents selected from the group consisting of alkylbenzene sulfonates and alkyl sulfates.
Inventors
- 👤 Nobukazu Ohi
- 👤 Hiroshi Kamohara
- 👤 Shunichi Futami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:58
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; A; A61; A61K; A61K6/00; A61K6/80; A61K6/849; A61K6/858; C04B2103/00; C04B2103/0068; C04B2103/0075; C04B2111/00; C04B2111/00474; C04B2111/00836; C04B2111/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
A low-dusting powder dental gypsum composition, consisting essentially of: (a) a hemihydrate gypsum; (b) 0.05 to 5.00 parts by weight of a setting controlling agent which is at least one member selected from the group consisting of inorganic acid salt setting accelerator, setting retarders, and setting expansion inhibitors; (c) 0.5 to 5.00 parts by weight of a wetting agent which is at least one member selected from the group consisting of liquid hydrophobic hydrocarbons, liquid hydrophobic fatty acid esters, isosteric acid, oleic acid, linolenic acid, linoleic acid, 2-ethylpentanoic acid, and 2-ethylhexanoic acid, wherein said wetting agent has a vapor pressure of 3.15 mm Hg or below at 20° C.; and (d) 0.01 to 0.50 parts by weight of an anionic surface active agent which is at least one member selected from the group consisting of alkylbenzene sulfonates and alkyl sulfates; wherein the total amount of components (a), (b), (c) and (d) adds up to 100 parts by weight.
Claim 2
Dependent Claim
158 words
A low-dusting powder dental gypsum composition, consisting essentially of: (a) a hemihydrate gypsum; (b) 0.05 to 5.00 parts by weight of a setting controlling agent which is at least one member selected from the group consisting of inorganic acid salt setting accelerator, setting retarders, and setting expansion inhibitors; (c) 0.5 to 5.00 parts by weight of a wetting agent which is at least one member selected from the group consisting of liquid hydrophobic hydrocarbons, liquid hydrophobic fatty acid esters, isosteric acid, oleic acid, linolenic acid, linoleic acid, 2-ethylpentanoic acid, and 2-ethylhexanoic acid, wherein said wetting agent has a vapor pressure of 3.15 mm Hg or below at 20° C.; and (d) 0.01 to 0.50 parts by weight of an anionic surface active agent which is at least one member selected from the group consisting of alkylbenzene sulfonates and alkyl sulfates; wherein the total amount of components (a), (b), (c) and (d) adds up to 100 parts by weight.
Claim 3
Dependent Claim
18 words
The low-dusting powder dental gypsum composition of claim 1, wherein said setting controlling agent is a setting accelerator.
Claim 4
Dependent Claim
18 words
The low-dusting powder dental gypsum composition of claim 1, wherein said setting controlling agent is a setting retarder.
Claim 5
Dependent Claim
18 words
The low-dusting powder dental gypsum composition of claim 1, wherein said setting controlling agent is a setting inhibitor.
Claim 6
Dependent Claim
37 words
The low-dusting powder dental gypsum composition of claim 1, wherein said liquid hydrophobic hydrocarbon is one member selected from the group consisting of pristane, squalane, a liquid paraffin, an alpha-olefin oligomer, nonane, decane, undecane, dodecane and tridecane.
Claim 7
Dependent Claim
59 words
The low-dusting powder dental gypsum composition of claim 1, wherein said liquid hydrophobic fatty acid ester is one member selected from the group consisting of isopropyl palmitate, hexyl laurate, isopropyl myristate, isopropyl isostearate, butyl stearate, ethyl linoleate, isopropyl linoleate, ethyl olive-oleate, ctyl issooctanate, hexyldecyl myristate, hexyldecylstearate, isostearyl palmitate, hexyldecyl isostearate, octyldodecyl neodecanoate, diethyl sebacate, diisopropyl sebacate, and diisopropyl adipate.
Claim 8
Dependent Claim
19 words
The low-dusting powder dental gypsum composition of claim 1, wherein said anionic surface active agent is an alkylbenzene sulfonate.
Claim 9
Dependent Claim
19 words
The low-dusting powder dental gypsum composition of claim 1, wherein said anionic surface active agent is an alkyl sulfate.
Claim 10
Dependent Claim
37 words
The low-dusting powder dental gypsum composition of claim 1, wherein alkyl sulfate is one member selected from the group consisting of sodium lauryl sulfate, potassium lauryl sulfate, sodium myristyl sulfate, sodium cetyl sulfate, and sodium stearyl sulfate.
Claim 11
Dependent Claim
19 words
The low-dusting powder dental gypsum composition of claim 1, wherein said anionic surface active agent is sodium dodecylbenzene sulfonate.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |