US4491607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold release agents and means of application
Assignee: Park Chemical Co
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Filing: 1981-11-23
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Granted: 1985-01-01
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Expires: 2001-11-23
Abstract
Abstract Mold release agents and means for their application are provided. The release agents are used in coating molds for forming expandible plastics. They are especially applicable to polyurethane-based reaction injection molding (RIM) systems. The release agents, which have a controlled saponified fatty acid content (unsaturated as oleate and/or linoleate and saturated as C 8 to C 12 alkanoate) make for significant advantage with respect to ease of release, prevention of residual build-up, mold and part cleanability, health and safety, cost, etc.
Inventors
- 👤 Robert J. Wesala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:50
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/56; B29C33/60
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
111 words
A mold release agent for coating molds for forming expandable plastics, constituted as a solid-free aqueous fatty acid soap formulation with at least one alkali metal hydroxide selected from the group consisting of sodium hydroxide and potassium hydroxide at a hydrogen ion concentration in the range from about pH 8.5 to about pH 11, consisting essentially of saponified C 18 unsaturated fatty acid C 8 to C 12 saturated fatty acid, the fatty acid content being from about 40 to 90% by weight unsaturated and from about 10 to 60% by weight saturated and further, expressed as total free acid, being about 1 to about 30% by weight of the formulation.
Claim 2
Dependent Claim
111 words
A mold release agent for coating molds for forming expandable plastics, constituted as a solid-free aqueous fatty acid soap formulation with at least one alkali metal hydroxide selected from the group consisting of sodium hydroxide and potassium hydroxide at a hydrogen ion concentration in the range from about pH 8.5 to about pH 11, consisting essentially of saponified C 18 unsaturated fatty acid C 8 to C 12 saturated fatty acid, the fatty acid content being from about 40 to 90% by weight unsaturated and from about 10 to 60% by weight saturated and further, expressed as total free acid, being about 1 to about 30% by weight of the formulation.
Claim 3
Dependent Claim
18 words
A mold release agent according to claim 1 containing about 5% fatty acid including about 1.25% pelargonic acid.
Claim 4
Dependent Claim
18 words
A mold release agent according to claim 1 containing about 5% fatty acid including about 2.0% pelargonic acid.
Claim 5
Dependent Claim
18 words
A mold release agent according to claim 1 containing about 5% fatty acid including about 2.5% pelargonic acid.
Claim 6
Dependent Claim
18 words
A mold release agent according to claim 1 containing about 5% fatty acid including about 3.0% pelargonic acid.
Claim 7
Dependent Claim
11 words
A mold release agent according to claim 1 containing oleic acid.
Claim 8
Dependent Claim
11 words
A mold release agent according to claim 1 containing linoleic acid.
Claim 9
Dependent Claim
16 words
A mold release agent according to claim 1 where the alkali metal hydroxide is sodium hydroxide.
Claim 10
Dependent Claim
16 words
A mold release agent according to claim 1 where the alkali metal hydroxide is potassium hydroxide.
Claim 11
Dependent Claim
20 words
A mold release agent for coating molds for polyurethane-based RIM systems according to claim 1 containing oleate and pelargonate soaps.
Claim 12
Dependent Claim
30 words
A mold release agent for coating molds for polyurethane-based RIM systems according to claim 1 obtained by neutralizing about 3.75% oleic acid and about 1.25% pelargonic acid with sodium hydroxide.
Claim 13
Dependent Claim
59 words
A method of coating a mold with a release agent, comprising the steps of applying a uniform wet film of the release agent according to claim 1 onto the mold surfaces of a mold maintained at elevated temperature sufficient to vaporize water from the film and maintaining the mold at elevated temperature until the thus applied film is dry.
Claim 14
Dependent Claim
15 words
A method of coating according to claim 12 where the film is applied by spraying.
References Cited (Backward Citations)
US3278430A
Cited
US3860521A
Cited
US3952079A
Cited
US4038088A
Cited
US4118235A
Cited
DE2702930A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-01 | 1988-07-02 | 1989-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-01 | 1992-07-02 | 1993-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-01 | 1996-07-02 | 1997-01-01 | $7700.00 | Window Closed / Lapsed |