Patent US4140672A successfully refreshed from Google Patents.
US4140672A
Expired / Lapsed
US
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Process for producing moldings
Assignee: Asahi Kasei Corp
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Filing: 1978-01-04
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Granted: 1979-02-20
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Expires: 1998-01-04
Abstract
Abstract A process for producing moldings comprises the steps of injecting a plastified synthetic resin into a mold cavity, thereafter or simultaneously injecting heated fluid having a viscosity of 0.01 - 100 poise into the same mold cavity to fill it with said fluid in such a manner that said heated fluid is surrounded by said synthetic resin within said mold cavity and releasing said fluid from said mold cavity after at least a portion of said synthetic resin has set. If the injected synthetic resin contains any foaming agent, a foamed article having its outer smooth skin can be obtained according to the present invention. If the injected synthetic resin contains no foaming agent, a hollow, smooth-surfaced article can be obtained.
Inventors
- 👤 Hiroshi Kataoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:20
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/04; B29C44/0492; B29C45/00; B29C45/17; B29C45/1703; B29C45/1704; B29C45/1706; B29C2045/1707; Y; Y10; Y10S; Y10S264/00; Y10S264/83
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
146 words
A process for producing a molding, comprising the steps of injecting plastified synthetic resin material into a closed mold cavity through an inlet in said mold cavity in an amount less than the volume of said mold cavity, injecting at a time not earlier than the time of injecting the synthetic resin a quantity of a heated fluid into the same mold cavity through the same inlet so that said mold cavity is filled, said heated fluid being surrounded by said synthetic resin within said mold cavity to temporarily form a composite structure having a surface layer of said synthetic resin and a core of said fluid, and releasing said fluid from said mold cavity after at least a portion of said synthetic resin has set, characterized by that said fluid is a viscous liquid having viscosity of 0.01-100 poise at the raised working temperature thereof.
Claim 2
Dependent Claim
146 words
A process for producing a molding, comprising the steps of injecting plastified synthetic resin material into a closed mold cavity through an inlet in said mold cavity in an amount less than the volume of said mold cavity, injecting at a time not earlier than the time of injecting the synthetic resin a quantity of a heated fluid into the same mold cavity through the same inlet so that said mold cavity is filled, said heated fluid being surrounded by said synthetic resin within said mold cavity to temporarily form a composite structure having a surface layer of said synthetic resin and a core of said fluid, and releasing said fluid from said mold cavity after at least a portion of said synthetic resin has set, characterized by that said fluid is a viscous liquid having viscosity of 0.01-100 poise at the raised working temperature thereof.
Claim 3
Dependent Claim
17 words
The process as set forth in claim 1, wherein said synthetic resin contains any suitable foaming agent.
Claim 4
Dependent Claim
23 words
The process as set forth in claim 1, wherein said viscous liquid has viscosity of 0.1-100 poise at the raised working temperature thereof.
Claim 5
Dependent Claim
15 words
The process as set forth in claim 1, wherein said viscous liquid is an oligomer.
Claim 6
Dependent Claim
59 words
The process as set forth in claim 1, wherein said synthetic resin material includes two different synthetic resins, a first of said synthetic resins being initially injected into said mold cavity and said resin containing no foaming agent and a second of said synthetic resins being subsequently injected into said mold cavity and said resin containing a foaming agent.
Claim 7
Dependent Claim
27 words
The process as set forth in claim 2, wherein said mold cavity is pre-charged with a gas under pressure prior to the injection of said synthetic resin.
Claim 8
Dependent Claim
27 words
The process as set forth in claim 5, wherein said mold cavity is pre-charged with a gas under pressure prior to the injection of said synthetic resins.
Claim 9
Dependent Claim
15 words
The process of claim 1 wherein the heated fluid is injected after the synthetic resin.
Claim 10
Dependent Claim
16 words
The process of claim 1 wherein the heated fluid is injected simultaneously with the synthetic resin.
Claim 11
Dependent Claim
25 words
The process of claim 1 wherein the material having a viscosity of 0.01-100 poise at the raised working temperature is a grease at room temperature.
Claim 12
Dependent Claim
25 words
The process of claim 1 wherein the material having a viscosity of 0.01-100 poise at the raised working temperature is a solid at room temperature.
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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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |