Patent US5028366A successfully refreshed from Google Patents.
US5028366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water based mold release compositions for making molded polyurethane foam
Assignee: Air Products and Chemicals Inc
•
Filing: 1988-01-12
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Granted: 1991-07-02
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Expires: 2008-01-12
Abstract
Abstract A method for preparing a polyurethane foam article in a mold by applying to a mold surface a water-based mold release composition which includes a release effective system which is in a solid (hardened) state at the mold pour temperature and a liquid state at the demold temperature, pouring a polyurethane foam composition into the mold, curing the foam composition and demolding the foam article. The use of such release effective system in the aqueous mold release composition provides for a reduction in surface defects of the polyurethane foam article. Also disclosed is the incorporation of a poly(siloxane-glycol) surfactant having a cloud point ranging from 25°-50° C. into a water-based mold release composition including an aqueous emulsion or dispersion of at least one release effective substance and desirably at least one emulsifying agent provides for improved surface quality of the foam product.
Inventors
- 👤 Mark E. Harakal
- 👤 George J. Wasilczyk
- 👤 Gary D. Andrew
- 👤 Zdizslaw Makus
- 👤 Michael Scarpati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:48
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/56; B29C33/60
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
79 words
In a method for preparing a polyurethane foam product in a mold by applying to the mold surface a mold release composition comprising an aqueous emulsion or dispersion having a release effective component, pouring a polyurethane foam composition into the mold, curing the foam composition and demolding the foam product, the improvement which comprises applying an aqueous mold release composition having a release effective component which is solid at the mold pour temperature and liquid at the demold temperature.
Claim 2
Dependent Claim
79 words
In a method for preparing a polyurethane foam product in a mold by applying to the mold surface a mold release composition comprising an aqueous emulsion or dispersion having a release effective component, pouring a polyurethane foam composition into the mold, curing the foam composition and demolding the foam product, the improvement which comprises applying an aqueous mold release composition having a release effective component which is solid at the mold pour temperature and liquid at the demold temperature.
Claim 3
Dependent Claim
22 words
The method of claim 1 in which the release effective component is solid at about 5° C. above the mold pour temperature.
Claim 4
Dependent Claim
21 words
The method of claim 1 in which the release effective component is liquid at about 5° C. below the demold temperature.
Claim 5
Dependent Claim
81 words
In a method for preparing an MDI or TDI polyurethane foam product in a heated mold by applying to the mold surface an aqueous mold release composition containing a release effective system, pouring an MDI or TDI polyurethane foam composition into the mold, curing the foam composition and demolding the foam product, the improvement which comprises applying an aqueous mold release composition having a release effective system which is solid at the mold pour temperature and liquid at the demold temperature.
Claim 6
Dependent Claim
81 words
In a method for preparing an MDI or TDI polyurethane foam product in a heated mold by applying to the mold surface an aqueous mold release composition containing a release effective system, pouring an MDI or TDI polyurethane foam composition into the mold, curing the foam composition and demolding the foam product, the improvement which comprises applying an aqueous mold release composition having a release effective system which is solid at the mold pour temperature and liquid at the demold temperature.
Claim 7
Dependent Claim
15 words
The method of claim 4 in which the mold pour temperature is about 130° F.
Claim 8
Dependent Claim
13 words
The method of claim 4 which the demold temperature is about 160°-165° F.
Claim 9
Dependent Claim
22 words
The method of claim 4 in which the release effective system is solid at about 5° C. above the mold pour temperature.
Claim 10
Dependent Claim
21 words
The method of claim 1 in which the release effective system is liquid at about 5° C. below the demold temperature.
Claim 11
Dependent Claim
21 words
The method of claim 7 in which the release effective system is liquid at about 5° C. below the demold temperature.
Claim 12
Dependent Claim
21 words
The method of claim 2 in which the release effective component is liquid at about 5° C. below the demold temperature.
Claim 13
Dependent Claim
27 words
The method of claim 10 in which the release effective component consists essentially of at least one microcrystalline or paraffin wax and at least one emulsifying agent.
Claim 14
Dependent Claim
14 words
The method of claim 5 in which the demold temperature is about 160°-165° F.
Claim 15
Dependent Claim
27 words
The method of claim 4 in which the release effective system consists essentially of at least one microcrystalline or paraffin wax and at least one emulsifying agent.
Claim 16
Dependent Claim
27 words
The method of claim 9 in which the release effective system consists essentially of at least one microcrystalline or paraffin wax and at least one emulsifying agent.
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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) | 1994-07-01 | 1994-12-31 | 1995-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-01 | 1998-12-31 | 1999-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-01 | 2002-12-31 | 2003-07-02 | $7700.00 | Window Closed / Lapsed |