US4683248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crosslinking of styrene polymers
Assignee: Luperox GmbH
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Filing: 1985-10-02
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Granted: 1987-07-28
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Expires: 2005-10-02
Abstract
Abstract Optionally nucleo-substituted styrene polymers are crosslinked at temperatures above 110° C. with combinations of crosslinkage promoters containing at least two polymerizable C--C double or C--C triple bonds in the molecule, and organic peroxides (with the exception of hydroperoxides, peracids, and ketone peroxides) having a 10 hour halflife temperature below 106° C.
Inventors
- 👤 Kurt Rauer
- 👤 Angelika Orner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:58
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/102; C08F; C08F257/00; C08F257/02; C08J2325/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
A process of crosslinking and foaming a homopolymer or copolymer selected from the group of polystyrenes, nucleo-substituted polystyrenes, impact-resistant polystyrenes, or mixtures thereof with the exception of p-methylstyrene homopolymers containing a chemically decomposing blowing agent free of amino or hydrazine groups comprising heating said homo- or copolymer at a temperature above 110° C. in the presence of 0.5 to 15% of at least one crosslinking promoter containing at least two active C--C double or C--C triple bonds in the molecule, 0.5 to 15% of at least one organic peroxide having a 10 hour halflife temperature below 106° C. (as determined in benzene) selected from the group of peresters, percarbonate esters, perketals, ether peroxides, diacyl peroxides, and ketone peroxide esters, and optionally foaming agents.
Claim 2
Dependent Claim
123 words
A process of crosslinking and foaming a homopolymer or copolymer selected from the group of polystyrenes, nucleo-substituted polystyrenes, impact-resistant polystyrenes, or mixtures thereof with the exception of p-methylstyrene homopolymers containing a chemically decomposing blowing agent free of amino or hydrazine groups comprising heating said homo- or copolymer at a temperature above 110° C. in the presence of 0.5 to 15% of at least one crosslinking promoter containing at least two active C--C double or C--C triple bonds in the molecule, 0.5 to 15% of at least one organic peroxide having a 10 hour halflife temperature below 106° C. (as determined in benzene) selected from the group of peresters, percarbonate esters, perketals, ether peroxides, diacyl peroxides, and ketone peroxide esters, and optionally foaming agents.
Claim 3
Dependent Claim
14 words
Process according to claim 1, characterized by the use of aromatic peresters as peroxides.
Claim 4
Dependent Claim
15 words
Process according to claim 1, characterized by the use of aromatic diacyl peroxides as peroxides.
Claim 5
Dependent Claim
14 words
Process according to claim 1, characterized by the use of percarbonate esters as peroxides.
References Cited (Backward Citations)
US3058928A
Cited
FR1259094A
Cited
US3432447A
Cited
US3743611A
Cited
US3965054A
Cited
US4272583A
Cited
US4433029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-27 | 1991-01-26 | 1991-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-27 | 1995-01-26 | 1995-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-27 | 1999-01-26 | 1999-07-28 | $7700.00 | Window Closed / Lapsed |