US4076695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone containing reaction injection molded polyurethanes
Assignee: Dow Silicones Corp
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Filing: 1977-02-07
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Granted: 1978-02-28
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Expires: 1997-02-07
Abstract
Abstract A reaction injection molding (RIM) process for making polyurethanes is disclosed where in addition to the conventional ingredients such as polyols, isocyanates, and catalysts there is included a carboxy functional siloxane. The incorporation of the carboxy functional siloxane aids in the release of the molded part and shortening the molding cycle time.
Inventors
- 👤 Joseph W. Keil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:46
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/61; C08G18/615; B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; B29C33/62; B29C33/64; B29C67/00; B29C67/24; B29C67/246; C08L; C08L75/00; C08G2120/00; Y; Y10; Y10S; Y10S264/00; Y10S264/83
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
55 words
In a process of reaction injection molding of polyurethanes which include the mixing of one or more of each of polyols, polyisocyanates and catalysts, the reaction of the foregoing ingredients, and the molding and curing of the foregoing mixture into the desired configuration, the improvement comprising mixing with the other ingredients a carboxy functional siloxane.
Claim 2
Dependent Claim
55 words
In a process of reaction injection molding of polyurethanes which include the mixing of one or more of each of polyols, polyisocyanates and catalysts, the reaction of the foregoing ingredients, and the molding and curing of the foregoing mixture into the desired configuration, the improvement comprising mixing with the other ingredients a carboxy functional siloxane.
Claim 3
Dependent Claim
104 words
A process as defined in claim 1 wherein the carboxy functional siloxane consists essentially of from 0.5 to 20 mole percent of R a R' b SiO 4-a-b/2 units and from 80 to 99.5 mole percent of R" c SiO 4-c/2 units wherein R is a carboxy functional radical, a has an average value from 1 to 3, R' is a hydrocarbon or substituted hydrocarbon radical, b has an average value from 0 to 2, the sum of a + b is from 1 to 3, R" is a hydrocarbon or substituted hydrocarbon radical, and c has an average value from 0 to 3.
Claim 4
Dependent Claim
49 words
A process as defined in claim 2 wherein in the carboxy functional siloxane R is bonded to the silicon atom via a silicon-carbon bond, R' is a hydrocarbon racical containing from 1 to 18 carbon atoms, and R" is a hydrocarbon radical containing from 1 to 18 carbon atoms.
Claim 5
Dependent Claim
45 words
A process as defined in claim 3 wherein in the carboxy functional siloxane R is a radical of the formula HOOC-R'"- wherein R'" is a divalent linking group composed of carbon and hydrogen atoms; carbon, hydrogen and oxygen atoms; or carbon, hydrogen and sulfur atoms.
Claim 6
Dependent Claim
56 words
A process as defined in claim 4 wherein in the carboxy functional siloxane R'" is a divalent linking group composed of carbon and hydrogen atoms and contains from 2 to 10 carbon atoms, at least 90 percent of the R' radicals are methyl radicals, and at least 90 percent of the R" radicals are methyl radicals.
Claim 7
Dependent Claim
26 words
A process as defined in claim 5 wherein the carboxy functional siloxane is a liquid and all of the R' and R" radicals are methyl radicals.
Claim 8
Dependent Claim
57 words
A process as defined in claim 4 wherein in the carboxy functional siloxane R'" is a divalent linking group composed of carbon, hydrogen and oxygen atoms and contains from 2 to 10 carbon atoms, at least 90 percent of the R' radicals are methyl radicals, and at least 90 percent of the R" radicals are methyl radicals.
Claim 9
Dependent Claim
26 words
A process as defined in claim 7 wherein the carboxy functional siloxane is a liquid and all of the R' and R" radicals are methyl radicals.
Claim 10
Dependent Claim
57 words
A process as defined in claim 4 wherein in the carboxy functional siloxane R'" is a divalent linking group composed of carbon, hydrogen and sulfur atoms and contains from 2 to 10 carbon atoms, at least 90 percent of the R' radicals are methyl radicals, and at least 90 percent of the R" radicals are methyl radicals.
Claim 11
Dependent Claim
25 words
A process as defined in claim 9 wherein the carboxy functional siloxane is a liquid and all of R' and R" radicals are methyl radicals.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |