US4879339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage stable and room temperature-curable organopolysiloxane composition
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1988-03-03
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Granted: 1989-11-07
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Expires: 2008-03-03
Abstract
Abstract A room temperature-curable organopolysiloxane composition is proposed which is useful as a material for imprinting or blocking of forms of, for example, medical and dental prostheses without the problem of curing retardation or incomplete curing. The composition comprises a vinyl-containing organopolysiloxane, organohydrogenpolysiloxane, platinum catalyst, inorganic filler, liquid paraffin or petrolatum and antioxidant. The antioxidant serves to protect the liquid paraffin or petrolatum from oxidation to produce oxidized compounds which may deactivate the platinum catalyst to cause curing retardation or incomplete curing.
Inventors
- 👤 Masachika Yoshino
- 👤 Nobuyuki Hasebe
- 👤 Hironao Fujiki
- 👤 Hiroshi Inomata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:10
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; A; A61; A61K; A61K6/00; A61K6/90; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
177 words
A room temperature-curable storage stable organopolysiloxane composition which comprises, in admixture: (A) 100 parts by weight of an organopolysiloxane having a viscosity of at least 50 centipoise at 25° C. and at least two vinyl groups bonded to the silicon atoms in a molecule; (B) an organohydrogenpolysiloxane having at least three hydrogen atoms directly bonded to the silicon atoms in a molecule in an amount sufficient to provide from 0.5 to 4.0 moles of the silicon-bonded hydrogen atoms per mole of the vinyl groups bonded to the silicon atoms in the component (A); (C) a catalytic amount of a platinum compound; (D) from 20 to 600 parts by weight of an inorganic filler; (E) from 5 to 80 parts by weight of an aliphatic hydrocarbon compound which is liquid or semi-solid at room temperature; and (F) a compound selected from the group consisting of erythrobic acid, sodium erythorbate, 2,6-ditert-butyl p-cresol, tocopherol, butyl hydroxy anisole and propyl gallate, in an amount of at least 10 ppm by weight based on the aliphatic hydrocarbon compound as the component (E).
Claim 2
Dependent Claim
177 words
A room temperature-curable storage stable organopolysiloxane composition which comprises, in admixture: (A) 100 parts by weight of an organopolysiloxane having a viscosity of at least 50 centipoise at 25° C. and at least two vinyl groups bonded to the silicon atoms in a molecule; (B) an organohydrogenpolysiloxane having at least three hydrogen atoms directly bonded to the silicon atoms in a molecule in an amount sufficient to provide from 0.5 to 4.0 moles of the silicon-bonded hydrogen atoms per mole of the vinyl groups bonded to the silicon atoms in the component (A); (C) a catalytic amount of a platinum compound; (D) from 20 to 600 parts by weight of an inorganic filler; (E) from 5 to 80 parts by weight of an aliphatic hydrocarbon compound which is liquid or semi-solid at room temperature; and (F) a compound selected from the group consisting of erythrobic acid, sodium erythorbate, 2,6-ditert-butyl p-cresol, tocopherol, butyl hydroxy anisole and propyl gallate, in an amount of at least 10 ppm by weight based on the aliphatic hydrocarbon compound as the component (E).
Claim 3
Dependent Claim
35 words
The room temperature-curable organopolysiloxane composition as claimed in claim 1 wherein at least 50% by moles of the organic groups bonded to the silicon atoms in the organopolysiloxane as the component (A) are methyl groups.
Claim 4
Dependent Claim
21 words
The room temperature-curable organopolysiloxane composition as claimed in claim 1 wherein the platinum compound as the component (C) is chloroplatinic acid.
Claim 5
Dependent Claim
44 words
The room temperature-curable organopolysiloxane composition as claimed in claim 1 wherein the amount of the platinum compound as the component (C) is in the range from 0.0001 to 0.1% by weight as platinum based on the total amount of the components (A) and (B).
Claim 6
Dependent Claim
34 words
The room temperature-curable organopolysiloxane composition as claimed in claim 1 wherein the aliphatic hydrocarbon compound which is liquid or semi-solid at room temperature has a viscosity of at least 50 centipoise at 25° C.
Claim 7
Dependent Claim
28 words
The room temperature-curable organopolysiloxane composition as claimed in claim 5 wherein the aliphatic hydrocarbon compound which is liquid or semi-solid at room temperature is liquid paraffin or petrolatum.
Claim 8
Dependent Claim
44 words
The room temperature-curable organopolysiloxane composition as claimed in claim 1 wherein the amount of the antioxidant as the component (F) is in the range from 100 to 5000 ppm by weight based on the amount of the aliphatic hydrocarbon compound as the component (E).
References Cited (Backward Citations)
US4035453A
Cited
US4273902A
Cited
US4214000A
Cited
US4359565A
Cited
US4568707A
Cited
US4614758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |