US4783295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing molded microcellular elastomers
Assignee: Lyondell Chemical Technology LP
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Filing: 1985-12-17
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Granted: 1988-11-08
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Expires: 2005-12-17
Abstract
Abstract An improved process for producing a molded microcellular elastomer with a reduced number of voids from at least two liquid reactants and a gas, which process comprises introducing into at least one reactant a gas to form an admixture; passing the admixture through a static mixer at superatmospheric pressure; then immediately mixing the admixture with the other reactant at superatmospheric pressure to form a reaction mixture; introducing the reaction mixture into a mold in which the pressure is substantially below the superatmospheric pressures used above; and curing the reaction mixture in the mold to produce a molded microcellular elastomer with a reduced number of large voids.
Inventors
- 👤 James D. Kearns
- 👤 Ronald J. Stapleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:52
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/30; B; B29; B29B; B29B7/00; B29B7/74; B29B7/7404; B29B7/7409; B29B7/7428; B29C; B29C44/00; B29C44/34; B29C44/3442; B29C44/3469; B29C44/348; B29C2791/00; B29C2791/004; B29K; B29K2021/00; B29K2105/00; B29K2105/04; B29K2105/041; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S264/83
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
134 words
A process for producing a molded microcellular elastomer with a reduced number of large voids from at least two liquid reactants and a gas which process consists essentially of: (a) introducing a gas into at least one of the liquid reactants to form a gas-liquid reactant admixture; (b) passing the admixture through a static mixer at superatmospheric pressure; (c) within about one second after step (b) mixing the admixture with an additional liquid reactant or reactants at about said superatmospheric pressure to form a reaction mixture; (d) within about one second after step (c) introducing the reaction mixture into a mold in which the pressure is substantially below the pressure in (c); and (e) curing the reaction mixture in the mold to produce a molded microcellular elastomer with a reduced number of large voids.
Claim 2
Dependent Claim
134 words
A process for producing a molded microcellular elastomer with a reduced number of large voids from at least two liquid reactants and a gas which process consists essentially of: (a) introducing a gas into at least one of the liquid reactants to form a gas-liquid reactant admixture; (b) passing the admixture through a static mixer at superatmospheric pressure; (c) within about one second after step (b) mixing the admixture with an additional liquid reactant or reactants at about said superatmospheric pressure to form a reaction mixture; (d) within about one second after step (c) introducing the reaction mixture into a mold in which the pressure is substantially below the pressure in (c); and (e) curing the reaction mixture in the mold to produce a molded microcellular elastomer with a reduced number of large voids.
Claim 3
Dependent Claim
22 words
A process as recited in claim 1 wherein steps (b) and (c) are conducted at a pressure greater than about 300 psi.
Claim 4
Dependent Claim
22 words
A process as recited in claim 1 wherein steps (b) and (c) are conducted at a pressure greater than about 1000 psi.
Claim 5
Dependent Claim
21 words
A process as recited in claim 1 wherein steps (b) and (c) are conducted at a pressure between about 1800-2000 psi.
Claim 6
Dependent Claim
20 words
A process as recited in claim 1 wherein step (d) is conducted at a pressure less than about 50 psi.
Claim 7
Dependent Claim
15 words
A process as recited in claim 1 wherein step (d) is conducted at atmospheric pressure.
Claim 8
Dependent Claim
33 words
A process as recited in claim 1 wherein the static mixer is a series of intersecting bars housed in a pipe wherein the bars are arranged at 45° angles to the pipe axis.
Claim 9
Dependent Claim
135 words
A process for producing a molded microcellular elastomer by reaction injection molding from at least two liquid reactants useful in such molding and a gas which process consists essentially of: (a) introducing a gas into at least one of the liquid reactants to form a gas-liquid reactant admixture; (b) passing the admixture through a static mixer at superatmospheric pressure; (c) within about one second after step (b) mixing the admixture with an additional liquid reactant or reactants at about said superatmospheric pressure to form a reaction mixture; (d) within about one second after step (c) introducing the reaction mixture into a mold in which the pressure is substantially below the pressure in (c); and (e) curing the reaction mixture in the mold to produce a molded microcellular elastomer with a reduced number of large voids.
Claim 10
Dependent Claim
135 words
A process for producing a molded microcellular elastomer by reaction injection molding from at least two liquid reactants useful in such molding and a gas which process consists essentially of: (a) introducing a gas into at least one of the liquid reactants to form a gas-liquid reactant admixture; (b) passing the admixture through a static mixer at superatmospheric pressure; (c) within about one second after step (b) mixing the admixture with an additional liquid reactant or reactants at about said superatmospheric pressure to form a reaction mixture; (d) within about one second after step (c) introducing the reaction mixture into a mold in which the pressure is substantially below the pressure in (c); and (e) curing the reaction mixture in the mold to produce a molded microcellular elastomer with a reduced number of large voids.
Claim 11
Dependent Claim
25 words
A process as recited in claim 8 wherein the liquid reactant used in (a) is polyol and the liquid reactant used in (c) is polyisocyanate.
Claim 12
Dependent Claim
27 words
A process as recited in claim 8 wherein the liquid reactant used in step (a) is polyisocyanate and the liquid reactant used in step (c) is polyol.
Claim 13
Dependent Claim
22 words
A process as recited in claim 8 wherein steps (b) and (c) are conducted at a pressure greater than about 1000 psi.
Claim 14
Dependent Claim
21 words
A process as recited in claim 8 wherein steps (a) and (b) are conducted at a pressure between about 1800-2000 psi.
Claim 15
Dependent Claim
12 words
A process as recited in claim 8 wherein the gas is nitrogen.
Claim 16
Dependent Claim
15 words
A process as recited in claim 8 wherein step (d) is conducted at atmospheric pressure.
Claim 17
Dependent Claim
33 words
A process as recited in claim 8 wherein the static mixer is a series of intersecting bars housed in a pipe wherein the bars are arranged at 45° angles to the pipe axis.
References Cited (Backward Citations)
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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) | 1991-11-08 | 1992-05-09 | 1992-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-08 | 1996-05-09 | 1996-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-08 | 2000-05-09 | 2000-11-08 | $7700.00 | Window Closed / Lapsed |