US4451425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for injection molding polyurethane using internal release agents
Assignee: Dow Chemical Co
•
Filing: 1983-01-28
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Granted: 1984-05-29
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Expires: 2003-01-28
Abstract
Abstract Hydroxylated lecithins are employed as mold release agents in the preparation of molded articles from polyurethane-forming compositions. Polyol compositions containing such mold release agents are also disclosed.
Inventors
- 👤 Louis W. Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:02
CPC Classifications
C; C08; C08G; C08G18/00; B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3878; C08G2120/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
In a process for the preparation of molded articles by injecting a polyurethane-forming composition containing at least one active hydrogen-containing material containing an average of more than one active hydrogen atom per molecule and at least one material containing an average of more than one -NCO group per molecule into a mold and thereafter removing a resultant polyurethane molded article therefrom; the improvement which comprises employing as said polyurethane-forming composition one which contains an effective amount of, as a mold release agent, at least one hydroxylated lecithin.
Claim 2
Dependent Claim
87 words
In a process for the preparation of molded articles by injecting a polyurethane-forming composition containing at least one active hydrogen-containing material containing an average of more than one active hydrogen atom per molecule and at least one material containing an average of more than one -NCO group per molecule into a mold and thereafter removing a resultant polyurethane molded article therefrom; the improvement which comprises employing as said polyurethane-forming composition one which contains an effective amount of, as a mold release agent, at least one hydroxylated lecithin.
Claim 3
Dependent Claim
21 words
A process of claim 1 wherein said hydroxylated lecithin is dissolved in an unsaturated fatty acid carrier which is also hydroxylated.
Claim 4
Dependent Claim
33 words
A process of claims 1 or 2 wherein said mold release agent is employed in quantities of at least about 0.1 parts per 100 parts by weight of total active hydrogen-containing material employed.
Claim 5
Dependent Claim
32 words
A process of claim 3 wherein said mold release agent is present in quantities of from about 1 to about 20 parts per 100 parts by weight of total active hydrogen-containing material.
Claim 6
Dependent Claim
32 words
A process of claim 3 wherein said mold release agent is present in quantities of from about 3 to about 5 parts per 100 parts by weight of total active hydrogen-containing material.
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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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |