Patent US4007153A successfully refreshed from Google Patents.
US4007153A
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Silicone dental impression compositions
Assignee: General Electric Co
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Filing: 1975-06-19
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Granted: 1977-02-08
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Expires: 1995-06-19
Abstract
Abstract Two-part room-temperature vulcanizing silicone dental impression compositions are provided which, before curing, consist essentially of a metallic salt of a monocarboxylic acid as a catalyst and a base compound. In one embodiment the base compound consists of a fluid diorganopolysiloxane, an organosilicon cross-linker and a unique filler combination of an admixture of zinc oxide, calcium carbonate and pumice. In another embodiment, the base compound consists of a fluid diorganopolysiloxane, an organosilicon cross-linker, mineral oil and a low oil absorption calcium carbonate filler.
Inventors
- 👤 Robert A. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:17
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098; A; A61; A61K; A61K6/00; A61K6/90; C08K3/00; C08K3/01; C08K3/013; C08K3/18; C08K3/20; C08K3/22; C08K3/24; C08K3/26; C08K3/34; C08K5/54; C08K5/541; C08K5/5415
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
187 words
A room temperature vulcanizing silicone dental impression composition which, before curing, consists essentially of from about 0.3 to about 0.7 parts by weight of a metallic salt of a monocarboxylic acid as a catalyst to about 100 parts of a base composition consisting essentially of: a. from about 25 to about 35% by weight of a fluid diorganopolysiloxane containing terminal silicon-bonded hydroxy groups and having a viscosity of from 2,000 to 250,000 cps. at 25° C.; b. from about 60 to about 75% by weight of a filler composition consisting essentially of an admixture of zinc oxide, calcium carbonate and pumice, said zinc oxide and calcium carbonate each being present in at least a sufficient amount to provide bulking and whitening and said pumice being present in at least a sufficient amount to provide putty-like consistency; c. from about 0.05 to about 2% by weight of an organo-silicon cross-linker having the general formula: ##STR4## wherein R is a radical selected from the group consisting of alkyl, alkenyl and aryl radicals and R 1 is a member of the group consisting of alkyl, alkenyl, aryl and alkoxy radicals.
Claim 2
Dependent Claim
187 words
A room temperature vulcanizing silicone dental impression composition which, before curing, consists essentially of from about 0.3 to about 0.7 parts by weight of a metallic salt of a monocarboxylic acid as a catalyst to about 100 parts of a base composition consisting essentially of: a. from about 25 to about 35% by weight of a fluid diorganopolysiloxane containing terminal silicon-bonded hydroxy groups and having a viscosity of from 2,000 to 250,000 cps. at 25° C.; b. from about 60 to about 75% by weight of a filler composition consisting essentially of an admixture of zinc oxide, calcium carbonate and pumice, said zinc oxide and calcium carbonate each being present in at least a sufficient amount to provide bulking and whitening and said pumice being present in at least a sufficient amount to provide putty-like consistency; c. from about 0.05 to about 2% by weight of an organo-silicon cross-linker having the general formula: ##STR4## wherein R is a radical selected from the group consisting of alkyl, alkenyl and aryl radicals and R 1 is a member of the group consisting of alkyl, alkenyl, aryl and alkoxy radicals.
Claim 3
Dependent Claim
13 words
A composition as defined in claim 1 wherein the diorganopolysiloxane (a) is dimethylpolysiloxane.
Claim 4
Dependent Claim
40 words
A composition as defined in claim 2 wherein the viscosity of said dimethylpolysiloxane (a) is in the range from 80,000 to 120,000 cps. at 25° C., said composition having low flow and being non-tacky to the touch prior to catalyzing.
Claim 5
Dependent Claim
28 words
A composition as defined in claim 3 wherein the metallic salt catalyst is in the weight ratio of about 0.6 parts to 100 parts of the base composition.
Claim 6
Dependent Claim
32 words
A composition as defined in claim 3 wherein said diorganopolysiloxane includes a small but effective amount of a low molecular weight dimethyl polysiloxane containing terminal silicon-bonded hydroxy groups, to slow curing time.
Claim 7
Dependent Claim
30 words
A composition as defined in claim 5 wherein the low molecular weight dimethyl polysiloxane contains about 7% by weight of hydroxy groups and from 5 to 10 dimethyl siloxane units.
Claim 8
Dependent Claim
30 words
A composition as defined in claim 6 wherein the low molecular weight dimethyl polysiloxane is in the amount from about 0.05 to about 2% by weight of the base composition.
Claim 9
Dependent Claim
39 words
A composition as defined in claim 2 wherein the viscosity of the dimethylpolysiloxane is in the range from 2,500 to 3,500 cps. at 25° C., said composition having high flow and being tacky to the touch prior to catalyzing.
Claim 10
Dependent Claim
31 words
A composition as defined in claim 8 wherein the metallic salt catalyst is in the amount of about 0.4 parts by weight to 100 parts by weight of the base composition.
Claim 11
Dependent Claim
16 words
A composition as defined in claim 1 wherein the organo-silicon cross-linker (c) is condensed ethyl orthosilicate.
Claim 12
Dependent Claim
15 words
A composition as defined in claim 1 wherein the metallic salt catalyst is tin octoate.
Claim 13
Dependent Claim
176 words
A room temperature vulcanizing silicone dental impression compositon which, before curing, consists essentially of from about 0.3 to about 0.7 parts by weight of a metallic salt of a monocarboxylic acid as a catalyst to 100 parts of a base composition consisting essentially of: a. from about 15 to about 25% by weight of a fluid diorganopolysiloxane containing terminal silicon-bonded hydroxy groups and having a viscosity of from about 15,000 to about 35,000 centipoise at 25° C.; b. from about 70 to about 85% by weight of a filler consisting essentially of low oil absorption calcium carbonate; c. from about 3 to about 8% by weight of mineral oil; and d. from about 0.05 to about 2% by weight of an organo-silicon cross-linker having the general formula: ##STR5## wherein R is a radical selected from the group consisting of alkyl, alkenyl and aryl radicals and R 1 is a member of the group consisting of alkyl, alkenyl, aryl and alkoxy groups, said composition having a non-sticky feel before curing, and a smooth, non-grainy appearance after curing.
Claim 14
Dependent Claim
176 words
A room temperature vulcanizing silicone dental impression compositon which, before curing, consists essentially of from about 0.3 to about 0.7 parts by weight of a metallic salt of a monocarboxylic acid as a catalyst to 100 parts of a base composition consisting essentially of: a. from about 15 to about 25% by weight of a fluid diorganopolysiloxane containing terminal silicon-bonded hydroxy groups and having a viscosity of from about 15,000 to about 35,000 centipoise at 25° C.; b. from about 70 to about 85% by weight of a filler consisting essentially of low oil absorption calcium carbonate; c. from about 3 to about 8% by weight of mineral oil; and d. from about 0.05 to about 2% by weight of an organo-silicon cross-linker having the general formula: ##STR5## wherein R is a radical selected from the group consisting of alkyl, alkenyl and aryl radicals and R 1 is a member of the group consisting of alkyl, alkenyl, aryl and alkoxy groups, said composition having a non-sticky feel before curing, and a smooth, non-grainy appearance after curing.
Claim 15
Dependent Claim
14 words
A composition as defined in claim 12 wherein the diorganopolysiloxane (a) is a dimethylpolysiloxane.
Claim 16
Dependent Claim
27 words
A composition as defined in claim 13 wherein the viscosity of said dimethyl polysiloxane is in the range of from 15,000 to 35,000 cps. at 25° C.
Claim 17
Dependent Claim
16 words
A composition as defined in claim 12 wherein the organo-silicon cross-linker (d) is condensed ethyl orthosilicate.
Claim 18
Dependent Claim
14 words
A composition as defined in claim 12 wherein the metallic salt is tin octoate.
Claim 19
Dependent Claim
177 words
A room temperature vulcanizing silicone dental impression composition which, before curing, consists essentially of from about 0.3 to about 0.7 parts by weight of a metallic salt of a monocarboxylic acid as a catalyst to about 100 parts of a base composition consisting essentially of: a. from about 25 to about 35% by weight of a fluid diorganopolysiloxane containing terminal silicon-bonded hydroxy groups and having a viscosity of from 2,000 to 250,000 cps. at 25° C.; b. from about 60 to about 75% by weight of a filler composition consisting essentially of an admixture of 3 to 15 parts of zinc oxide, 5 to 25 parts of calcium carbonate and 45 to 65 parts of pumice, based on 100 parts by weight of the base composition; c. from about 0.05 to about 2% by weight of an organo-silicon cross-linker having the general formula: ##STR6## wherein R is a radical selected from the group consisting of alkyl, alkenyl and aryl radicals and R 1 is a member of the group consisting of alkyl, alkenyl, aryl and alkoxy radicals.
Claim 20
Dependent Claim
177 words
A room temperature vulcanizing silicone dental impression composition which, before curing, consists essentially of from about 0.3 to about 0.7 parts by weight of a metallic salt of a monocarboxylic acid as a catalyst to about 100 parts of a base composition consisting essentially of: a. from about 25 to about 35% by weight of a fluid diorganopolysiloxane containing terminal silicon-bonded hydroxy groups and having a viscosity of from 2,000 to 250,000 cps. at 25° C.; b. from about 60 to about 75% by weight of a filler composition consisting essentially of an admixture of 3 to 15 parts of zinc oxide, 5 to 25 parts of calcium carbonate and 45 to 65 parts of pumice, based on 100 parts by weight of the base composition; c. from about 0.05 to about 2% by weight of an organo-silicon cross-linker having the general formula: ##STR6## wherein R is a radical selected from the group consisting of alkyl, alkenyl and aryl radicals and R 1 is a member of the group consisting of alkyl, alkenyl, aryl and alkoxy radicals.
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) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |