US4136149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded rubber article and method
Assignee: Gates Corp
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Filing: 1977-07-18
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Granted: 1979-01-23
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Expires: 1997-07-18
Abstract
Abstract A molded rubber article is described having an exterior or surface layer which is formed of a blend including a heat setting rubbery polymer, and a halogenated polyethylene acting as an internal mold release agent during processing and also enhancing the surface qualities of the molded article.
Inventors
- 👤 Roger A. Payne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:57
CPC Classifications
B; B29; B29D; B29D23/00; B29D23/001; B29C; B29C33/00; B29C33/56; B29C33/60; B29C33/62; B29C33/68; B29C49/00; B29C49/0005; B29C49/0006; B29C53/00; B29C53/22; B29C53/30; F; F16; F16L; F16L11/00; F16L11/04; F16L11/08; F16L11/081; F16L11/11; F16L11/112; B29K; B29K2021/00; Y; Y10; Y10S; Y10S264/00; Y10S264/52
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
A method for releasing an externally molded rubber article from its associated metal mold surface, the outer surface of the article being comprised of a heat setting rubbery polymer normally adherent to the mold surface upon its release, without requiring use of a separate external mold release agent, comprising: blending and incorporating with said heat setting rubbery polymer, prior to molding, from about 2 to about 175 weight percent of a chlorinated or brominated polyethylene based on the weight of the rubbery polymer to form a rubbery blend; positioning the outer surface of the article, having said blend, against the mold surface and curing the article; and removing the thus formed molded article from the mold.
Claim 2
Independent Claim
116 words
A method for releasing an externally molded rubber article from its associated metal mold surface, the outer surface of the article being comprised of a heat setting rubbery polymer normally adherent to the mold surface upon its release, without requiring use of a separate external mold release agent, comprising: blending and incorporating with said heat setting rubbery polymer, prior to molding, from about 2 to about 175 weight percent of a chlorinated or brominated polyethylene based on the weight of the rubbery polymer to form a rubbery blend; positioning the outer surface of the article, having said blend, against the mold surface and curing the article; and removing the thus formed molded article from the mold.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein no external mold release agent is employed, and the article removed from the mold releases without residually adhering to the mold surface.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the heat setting rubbery polymer is a terpolymer of ethylene, propylene and a nonconjugated diene.
Claim 5
Dependent Claim
37 words
The method of claim 1 wherein the rubber article is a hose having a cover, and the heat setting rubbery polymer used in the cover has as a monomeric component an olefin having from 2-4 carbon atoms.
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) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |