US4386165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Styrenic polymer foams and preparation thereof
Assignee: Dow Chemical Co
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Filing: 1981-09-28
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Granted: 1983-05-31
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Expires: 2001-09-28
Abstract
Abstract Extruded styrenic polymer foams having improved flammability characteristics are obtained when using volatile fluid blowing agents by incorporating therein a small amount (e.g., from about 0.03 to about 2 weight percent based on polymer) of a waxy material in conjunction with at least one conventional non-waxy halogenated flame retarding agent.
Inventors
- 👤 Kyung W. Suh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:38
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/0014; C08J9/0019; C08J2325/00; C08J2325/02; C08J2491/00; Y; Y10; Y10S; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
53 words
An expandable styrenic polymer composition comprising a styrenic polymer, at least one volatile organic blowing agent, at least one non-waxy halogenated flame retarding agent and from about 0.03 to less than 2 weight percent of a waxy material melting above the foaming point of the styrenic polymer composition but below about 140° C.
Claim 2
Dependent Claim
53 words
An expandable styrenic polymer composition comprising a styrenic polymer, at least one volatile organic blowing agent, at least one non-waxy halogenated flame retarding agent and from about 0.03 to less than 2 weight percent of a waxy material melting above the foaming point of the styrenic polymer composition but below about 140° C.
Claim 3
Dependent Claim
14 words
The expandable styrenic polymer composition of claim 1 wherein the styrenic polymer is polystyrene.
Claim 4
Dependent Claim
15 words
The expandable styrenic polymer composition of claim 1 wherein the waxy material is chlorinated paraffin.
Claim 5
Dependent Claim
16 words
The expandable styrenic polymer composition of claim 1 wherein the halogenated flame retarding agent is monochloropentabromocyclohexane.
Claim 6
Dependent Claim
30 words
The expandable styrenic polymer composition of claim 1 wherein the waxy material is present in an amount of from 0.1 to about 1.5 weight percent based upon the styrenic polymer.
Claim 7
Dependent Claim
30 words
The expandable styrenic polymer composition of claim 1 wherein the waxy material is present in an amount of from 0.1 to about 1.0 weight percent based upon the styrenic polymer.
Claim 8
Dependent Claim
125 words
In a process for preparing an extruded styrenic polymer foam wherein a heat-plastified styrenic polymer gel containing at least one volatile fluid foaming agent and at least one non-waxy halogenated flame retarding agent is expressed from a die into a region of reduced pressure and wherein the expressed gel expands into cellular form and is cooled to a temperature at which the expanded cellular gel is self supporting; the improvement which comprises incorporating into the heat-plastified unfoamed gal from about 0.03 to less than 2 weight percent, based upon the styrenic polymer weight, of a waxy material which has a melting point below about 140° C. and which imparts improved flammability characteristics to the resulting styrenic polymer foam without significantly increasing the cell size thereof.
Claim 9
Dependent Claim
125 words
In a process for preparing an extruded styrenic polymer foam wherein a heat-plastified styrenic polymer gel containing at least one volatile fluid foaming agent and at least one non-waxy halogenated flame retarding agent is expressed from a die into a region of reduced pressure and wherein the expressed gel expands into cellular form and is cooled to a temperature at which the expanded cellular gel is self supporting; the improvement which comprises incorporating into the heat-plastified unfoamed gal from about 0.03 to less than 2 weight percent, based upon the styrenic polymer weight, of a waxy material which has a melting point below about 140° C. and which imparts improved flammability characteristics to the resulting styrenic polymer foam without significantly increasing the cell size thereof.
Claim 10
Dependent Claim
31 words
The process improvement of claim 7 in which the waxy material has a melting point which is equal to or greater than the foaming temperature employed for the heat-plastified polymer gel.
Claim 11
Dependent Claim
13 words
The process improvement of claim 8 wherein the waxy material is chlorinated paraffin.
Claim 12
Dependent Claim
30 words
The process improvement of claim 8 wherein the waxy material is employed in an amount of from about 0.1 to about 1.5 weight percent based upon the styrenic polymer weight.
Claim 13
Dependent Claim
30 words
The process improvement of claim 8 wherein the waxy material is employed in an amount of from about 0.1 to about 1.0 weight percent based upon the styrenic polymer weight.
Claim 14
Dependent Claim
14 words
The process improvement of claim 8 wherein the halogenated flame retarding agent is monochloropentabromocyclohexane.
Claim 15
Dependent Claim
12 words
The process improvement of claim 8 wherein the styrenic polymer is polystyrene.
References Cited (Backward Citations)
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US3668155A
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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) | 1986-05-30 | 1986-11-29 | 1987-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-30 | 1990-11-29 | 1991-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-30 | 1994-11-29 | 1995-05-31 | $7700.00 | Window Closed / Lapsed |