US4560784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-resistant organopolysiloxane composition
Assignee: Shin-Etsu Chemical Co Ltd
•
Filing: 1985-02-04
•
Granted: 1985-12-24
•
Expires: 2005-02-04
Abstract
Abstract The organopolysiloxane composition, e.g. silicone fluid, of the invention is imparted with high heat resistance by admixing with a specific heat-resistance improver which is prepared by a heat treatment of a mixture composed of (a) 100 parts by weight of an organopolysiloxane having a specified viscosity, (b) a carboxylate of cerium such as 2-ethylhexoate in an amount of 0.05 to 5 parts by weight as cerium and (c) an alkoxide compound of titanium or zirconium such as tetrabutyl titanate in an amount to give 0.1 to 5 times by weight of the titanium or zirconium element based on the cerium content in the component (b) at a temperature of, for example, 150 DEG to 310 DEG C. for 30 minutes to 10 hours.
Inventors
- 👤 Shigeru Mori
- 👤 Yasuo Tarumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:53
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/38; C08G77/382; C08G77/398; C08L; C08L83/00; C08L83/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
192 words
A heat-resistant organopolysiloxane composition which comprises: (A) 100 parts by weight of a first organopolysiloxane; and (B) from 0.1 to 10 parts by weight of a reaction product obtained by subjecting a mixture comprising (a) 100 parts by weight of a second organopolysiloxane having a viscosity in the range from 10 to 10,000 centistokes at 25° C., (b) a cerium carboxylate represented by the general formula (R 1 COO) n Ce, in which R 1 is a monovalent hydrocarbon group and the suffix n is 3 or 4, in such an amount that from 0.5 to 5 parts by weight of cerium are provided, and (c) an alkoxide compound of titanium or zirconium represented by the general formula (R 2 O) 4 M, in which R 2 is a monovalent hydrocarbon group and M is an atom of titanium or zirconium, or a partial hydrolysis product thereof in an amount to provide the element of titanium or zirconium in an amount in the range from 0.1 to 5 times by weight of the amount of cerium in the component (b), to a heat treatment at a temperature of 150° C. or higher.
Claim 2
Dependent Claim
192 words
A heat-resistant organopolysiloxane composition which comprises: (A) 100 parts by weight of a first organopolysiloxane; and (B) from 0.1 to 10 parts by weight of a reaction product obtained by subjecting a mixture comprising (a) 100 parts by weight of a second organopolysiloxane having a viscosity in the range from 10 to 10,000 centistokes at 25° C., (b) a cerium carboxylate represented by the general formula (R 1 COO) n Ce, in which R 1 is a monovalent hydrocarbon group and the suffix n is 3 or 4, in such an amount that from 0.5 to 5 parts by weight of cerium are provided, and (c) an alkoxide compound of titanium or zirconium represented by the general formula (R 2 O) 4 M, in which R 2 is a monovalent hydrocarbon group and M is an atom of titanium or zirconium, or a partial hydrolysis product thereof in an amount to provide the element of titanium or zirconium in an amount in the range from 0.1 to 5 times by weight of the amount of cerium in the component (b), to a heat treatment at a temperature of 150° C. or higher.
Claim 3
Dependent Claim
31 words
The heat-resistant organopolysiloxane composition as claimed in claim 1 wherein the second organopolysiloxane as the component (a) has a viscosity in the range from 50 to 1000 centistokes at 25° C.
Claim 4
Dependent Claim
28 words
The heat-resistant organopolysiloxane composition as claimed in claim 1 wherein the cerium carboxylate is selected from the class consisting of 2-ethylhexoate, naphthenate, oleate, stearate and laurate of cerium.
Claim 5
Dependent Claim
31 words
The heat-resistant organopolysiloxane composition as claimed in claim 1 wherein the monovalent hydrocarbon group denoted by R 2 is selected from the class consisting of isopropyl, n-butyl, stearyl and octyl groups.
Claim 6
Dependent Claim
35 words
The heat-resistant organopolysiloxane composition as claimed in claim 1 wherein the cerium carboxylate is added to the mixture composed of the components (a), (b) and (c) as a mixture of carboxylates of rare earth elements.
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) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |