Patent US3900433A successfully refreshed from Google Patents.
US3900433A
Expired / Lapsed
US
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Expandable polystyrene beads
Assignee: Honeywell International Inc
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Filing: 1973-12-17
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Granted: 1975-08-19
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Expires: 1993-12-17
Abstract
Abstract A styrene polymer bead impregnated with a blowing agent containing from about 0.5 to about 20 weight percent of an impregnation aid and the process for preparing same.
Inventors
- 👤 Bernard Taub
- 👤 Daniel F Harnish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:51
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J9/18; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06; Y; Y10; Y10S; Y10S521/00; Y10S521/908
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
110 words
A PROCESS FOR MAKING EXPANDABLE STYRENE POLYMER PARTICLES BY CONTACTING PARTICLES OF SAID STYRENE POLYMER WITH A VOLATILE ORGANIC FLUID BLOWING AGENT, SAID BLOWING AGENT CONTAINING FROM ABOUT 0.5 TO ABOUT 20 PERCENT BY WEIGHT OF BLOWING AGENT OF AN IMPREGNATION AID CONSISTING ESSENTIALLY OF A COMPOUND HAVING A SOLUBILITY PARAMETER BETWEEN 7 AND 12 HILDEBRANDS, A CRITICAL VOLUME OF LESS THAN ABOUT 190 CM3/GRAM MOLE AND A HYDROGEN BONDING PARAMETER CONTRIBUTION TO SAID SOLUBILITY PARAMETER OF LESS THAN 5 HILDEBRANDS, THE IMPREGNATION AID BEING PRESENT IN AN AMOUNT SUFFICIENT TO PERMIT INCORPORATION OF THE BLOWING AGENT INTO THE STYRENE POLYMER PARTICLE TO FORM A FREE FLOWING STYRENE POLYMER PARTICLE.
Claim 2
Dependent Claim
110 words
A PROCESS FOR MAKING EXPANDABLE STYRENE POLYMER PARTICLES BY CONTACTING PARTICLES OF SAID STYRENE POLYMER WITH A VOLATILE ORGANIC FLUID BLOWING AGENT, SAID BLOWING AGENT CONTAINING FROM ABOUT 0.5 TO ABOUT 20 PERCENT BY WEIGHT OF BLOWING AGENT OF AN IMPREGNATION AID CONSISTING ESSENTIALLY OF A COMPOUND HAVING A SOLUBILITY PARAMETER BETWEEN 7 AND 12 HILDEBRANDS, A CRITICAL VOLUME OF LESS THAN ABOUT 190 CM3/GRAM MOLE AND A HYDROGEN BONDING PARAMETER CONTRIBUTION TO SAID SOLUBILITY PARAMETER OF LESS THAN 5 HILDEBRANDS, THE IMPREGNATION AID BEING PRESENT IN AN AMOUNT SUFFICIENT TO PERMIT INCORPORATION OF THE BLOWING AGENT INTO THE STYRENE POLYMER PARTICLE TO FORM A FREE FLOWING STYRENE POLYMER PARTICLE.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the styrene polymer is insoluble in the blowing agent.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein said styrene polymer is contacted with the blowing agent in liquid suspension.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the impregnation aid is selected from methyl chloride or monochloromonofluoromethane.
Claim 6
Dependent Claim
26 words
The process of claim 4 wherein the blowing agent is a hydrocarbon selected from buTane, isobutane, pentane, isopentane, n-hexane, 2 methyl pentane and 5 methyl pentane.
Claim 7
Dependent Claim
21 words
The process of claim 4 wherein the blowing agent is a halogenated hydrocarbon selected from symmetrical and assymetrical dichlorotetrafluoroethane and dichlorodifluoromethane.
Claim 8
Dependent Claim
11 words
The process of claim 2 wherein the impregnation aid is monochloromonofluoromethane.
Claim 9
Dependent Claim
18 words
The process of claim 7 wherein said styrene polymer is contacted with the blowing agent in liquid suspension.
Claim 10
Dependent Claim
16 words
The process of claim 6 wherein the impregnation aid is selected from methyl chloride or monochloromonofluoromethane.
Claim 11
Dependent Claim
20 words
The process of claim 1 wherein the process is performed at a temperature between about 20* and about 35* C.
Claim 12
Dependent Claim
19 words
The process of claim 1 wherein from about 3 to about 15 weight percent of impregnation aid is used.
Claim 13
Dependent Claim
70 words
A free flowing styrene polymer particle impregnated with a blowing agent containing from about 0.5 to about 20 percent by weight of blowing agent of an impregnation aid, said impregnation aid consisting essentially of a compound having a solubility parameter between 7 and 12 hildebrands, a critical volume of less than about 190 cm3/gram mole and a hydrogen bonding parameter contribution to said solubility parameter of less than 5 hildebrands.
Claim 14
Dependent Claim
70 words
A free flowing styrene polymer particle impregnated with a blowing agent containing from about 0.5 to about 20 percent by weight of blowing agent of an impregnation aid, said impregnation aid consisting essentially of a compound having a solubility parameter between 7 and 12 hildebrands, a critical volume of less than about 190 cm3/gram mole and a hydrogen bonding parameter contribution to said solubility parameter of less than 5 hildebrands.
Claim 15
Dependent Claim
27 words
The polymer according to claim 12 wherein the blowing agent is a hydrocarbon selected from butane, isobutane, pentane, isopentane, n-hexane, 2 methyl pentane and 5 methyl pentane.
Claim 16
Dependent Claim
22 words
The polymer according to claim 12 wherein the blowing agent is a halogenated hydrocarbon selected from symmetrical and assymetrical dichlorotetrafluoroethane and dichlorodifluoromethane.
Claim 17
Dependent Claim
17 words
The polymer according to claim 12 wherein the impregnation aid is selected from methyl chloride or monochloromonofluoromethane.
Claim 18
Dependent Claim
12 words
The polymer according to claim 15 wherein the impregnation aid is monochloromonofluoromethane.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |