US4228244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing fine particle expandable styrene polymers containing small concentrations of organic bromine compounds
Assignee: Huels AG
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Filing: 1979-08-29
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Granted: 1980-10-14
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Expires: 1999-08-29
Abstract
Abstract The process for the preparation of shaped bodies based on expanded styrene polymers comprising: the polymerization of styrene or a mixture thereof with at least one monomer copolymerizable therewith, the addition of an expanding agent, pre-forming of the resulting expandable particles, ageing of the pre-formed particles, and molding thereof in a pressure resistant mold, is improved in the decrease of the minimum mold dwell time by carrying the polymerization in the presence of 0.0005 to less than 0.01% by weight based on the styrene polymer of organic bromine compounds which give a chain transfer constant of at least 200 and at 100° C. in bidistilled water the bromine compounds split off less than one molar % of hydrogen bromide per equivalent of bromine present in the molecule.
Inventors
- 👤 Josef K. Rigler
- 👤 Horst Leithauser
- 👤 Karl Trukenbrod
- 👤 Werner Ogrzewalla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:32
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J9/20; C08J9/0014; C08J9/0019; C08K; C08K5/00; C08K5/02; C08J2325/00; C08J2325/02; C08J2325/04; Y; Y10; Y10S; Y10S264/00; Y10S264/15; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
In a particulate molding composition for the production of foamed articles consisting essentially of a mixture of an expanding agent and a polymerized styrene monomer or styrene monomer in admixture with comonomers, the improvement comprising said composition containing about 0.00005 to 0.01 percent by weight based on said monomers and comonomers of organic bromine compounds which evidence a chain transfer constant of at least 200 and at 100° C. in bidistilled water said organic bromine compounds split off less than one molar % of hydrogen bromide per equivalent of bromine present in the molecule.
Claim 2
Dependent Claim
94 words
In a particulate molding composition for the production of foamed articles consisting essentially of a mixture of an expanding agent and a polymerized styrene monomer or styrene monomer in admixture with comonomers, the improvement comprising said composition containing about 0.00005 to 0.01 percent by weight based on said monomers and comonomers of organic bromine compounds which evidence a chain transfer constant of at least 200 and at 100° C. in bidistilled water said organic bromine compounds split off less than one molar % of hydrogen bromide per equivalent of bromine present in the molecule.
Claim 3
Dependent Claim
19 words
The molding composition of claim 1, containing about 0.0001 to 0.005 percent by weight of said organic bromine compounds.
Claim 4
Dependent Claim
26 words
The molding composition of claim 2, wherein said organic bromine compounds are selected from the group consisting of 1,1,1,3-tetrabromo-3-phenylpropane, cis-1,1,2,3,4,4-hexabromobutene, trans-1,1,2,3,4,4-hexabromobutene, 1,1,2,3,3,4-hexabromo-butane, 1,1,2,2,4,5-Hexabromo-pentane, and 1,1,2,3,4,6-hexabromo-hexene (-2).
Claim 5
Dependent Claim
13 words
The molding composition of claim 2, wherein said organic bromine compounds include 1,1,2,3,4,4-hexabromobutene.
Claim 6
Dependent Claim
126 words
In a process for the preparation of shaped bodies based on expanded styrene polymers comprising: the polymerization of styrene or a mixture thereof with at least one monomer copolymerizable therewith, the addition of an expanding agent, pre-forming of the resulting expandable particles, ageing of the formed particles, and molding thereof in a pressure resistant mold, the improvement comprising: carrying out the polymerization in the presence of about 0.00005 to 0.01 percent by weight based on the weight of said styrene or mixture thereof of organic bromine compounds which evidence a chain transfer constant of at least 200 and at 100° C. in bidistilled water said organic bromine compounds split off less than one molar % of hydrogen bromide per equivalent of bromine present in the molecule.
Claim 7
Dependent Claim
126 words
In a process for the preparation of shaped bodies based on expanded styrene polymers comprising: the polymerization of styrene or a mixture thereof with at least one monomer copolymerizable therewith, the addition of an expanding agent, pre-forming of the resulting expandable particles, ageing of the formed particles, and molding thereof in a pressure resistant mold, the improvement comprising: carrying out the polymerization in the presence of about 0.00005 to 0.01 percent by weight based on the weight of said styrene or mixture thereof of organic bromine compounds which evidence a chain transfer constant of at least 200 and at 100° C. in bidistilled water said organic bromine compounds split off less than one molar % of hydrogen bromide per equivalent of bromine present in the molecule.
Claim 8
Dependent Claim
35 words
The process of claim 5, wherein said polymerization is suspension-polymerization in the presence of radical initiators, and said organic bromine compounds are added dissolved in monomerous styrene before or at the beginning of the polymerization.
Claim 9
Dependent Claim
25 words
The process of claim 5, wherein said organic bromine compounds are added dissolved in said expanding agent before or at the beginning of the polymerization.
Claim 10
Dependent Claim
25 words
The process of claim 5, wherein said organic bromine compounds are selected from the group consisting of 1,1,1,3-tetrabromo-3-phenylpropane, cis-1,1,2,3,4,4-hexabromobutene, trans-1,1,2,3,4,4-hexabromobutene, 1,1,2,3,3,4-hexabromo-butane, 1,1,2,2,4,5-Hexabromopentane, and 1,1,2,3,4,6-hexabromo-hexene (-2).
Claim 11
Dependent Claim
18 words
The process of claim 8, containing about 0.0001 to 0.005 percent by weight of said organic bromine compounds.
Claim 12
Dependent Claim
10 words
The shaped bodies obtained by the process of claim 5.
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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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |