US3666848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing closed mold polyurethane foam moldings free of surface voids by flushing the mold with a vaporized halogenated hydrocarbon
Assignee: Milacron Inc
•
Filing: 1969-11-24
•
Granted: 1972-05-30
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Expires: 1989-11-24
Abstract
Abstract Foamed polyurethane moldings free of surface voids and having a substantially uniform skin are formed in a closed mold which has been purged of air with a vaporized liquid halogenated hydrocarbon capable of condensing on the mold walls or dissolving in the molding composition at the temperature and pressure conditions used in molding.
Inventors
- 👤 Robert C Harper
- 👤 Cincinnati Milling Machine Co
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/34; B; B29; B29C; B29C44/00; B29C44/02; B29C44/04; B29C2791/00; B29C2791/004; B29C2791/005; B29K; B29K2075/00; B29K2105/00; B29K2105/04; B29K2105/043; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S264/00; Y10S264/14
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
24 words
flushing said mold with a vaporized liquid halogenated hydrocarbon in volume equal to about one to four times the free volume of said mold;
Claim 2
Dependent Claim
21 words
The process of claim 1 in which said first mold temperature is in the range of about 110* to 160* F.
Claim 3
Dependent Claim
26 words
flushing said closed system with a vaporized liquid halogenated hydrocarbon in volume equal to about one to four times the free volume of said closed system;
Claim 4
Dependent Claim
16 words
supplying and mixing in said mixing chamber a liquid polyurethane molding composition containing a blowing agent;
Claim 5
Dependent Claim
14 words
The process claim 2 wherein said temperature range is about 125* to 145* F.
Claim 6
Dependent Claim
42 words
partially filling said mold containing said vaporized liquid with a liquid polyurethane molding composition containing a blowing agent, the remainder of said mold remaining filled with an atmosphere consisting of at least 95 percent by volume of the vaporized liquid halogenated hydrocarbon;
Claim 7
Dependent Claim
21 words
expanding said molding composition to fill said mold at a second mold temperature at least as great as said first temperature;
Claim 8
Dependent Claim
24 words
The process of claim 1 in which said vaporized liquid is selected from the group consisting of trichloromonofluoromethane, dichlorodifluoromethane, mixtures thereof, and methylene chloride.
Claim 9
Dependent Claim
40 words
transferring via interconnecting means said polyurethane molding composition to said mold to partially fill such mold, the remainder of said mold remaining filled with an atmosphere consisting of at least 95 percent by volume of the vaporized liquid halogenated hydrocarbon;
Claim 10
Dependent Claim
11 words
closing said interconnecting means between said mixing chamber and said mold;
Claim 11
Dependent Claim
12 words
The process of claim 4 in which said vaporized liquid is trichloromonofluoromethane.
Claim 12
Dependent Claim
9 words
curing said molding composition into a solid foam, and;
Claim 13
Dependent Claim
49 words
recovering the resultant foamed molded product; said vaporized liquid having an atmospheric boiling point below said first mold temperature and being capable of diffusion by condensation and/or solution into the polyurethane at the temperature and pressure conditions existing inside the mold at the mold surfaces during said expanding step.
Claim 14
Dependent Claim
25 words
The process of claim 1 in which said blowing agent is a mixture of trichloromonofluoromethane and dichlorodifluoromethane in a weight ratio of 6:1 to 12:1.
Claim 15
Dependent Claim
21 words
expanding said molding composition to fill said mold at a second mold temperature at least as great as said first temperature;
Claim 16
Dependent Claim
9 words
curing said molding composition into a solid foam, and;
Claim 17
Dependent Claim
14 words
A process for the production of foamed polyurethane moldings in a closed mold comprising:
Claim 18
Dependent Claim
46 words
recovering the resultant foamed molded product; said vaporized liquid having an atmospheric boiling point below said first mold temperature and being capable of diffusion by condensation and/or solution into the polyurethane at the temperature and pressure conditions existing inside the mold surfaces during said expanding step.
Claim 19
Dependent Claim
32 words
Process of claim 7 wherein the first mold temperature is 110* to 160* F and said vaporized liquid is selected from the group consisting of trichloromonofluoromethane, dichlorodifluoromethane, mixtures thereof and methylene chloride.
Claim 20
Dependent Claim
24 words
The process of claim 7 in which said vaporized liquid is selected from the group consisting of trichloromonofluoromethane, dichlorodifluoromethane, mixtures thereof and methylene chloride.
Claim 21
Dependent Claim
24 words
The process of claim 7 wherein said blowing agent is a mixture of trichloromonofluoromethane and dichlorodifluoromethane in a weight ratio of 6:1 to 12:1.
Claim 22
Dependent Claim
23 words
The process of claim 7 in which said first temperature of said mold is in the range of about 125* to 145* F.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |