US4386133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated beads with macromonomer-styrene polymerizate coating
Assignee: Lyondell Chemical Technology LP
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Filing: 1982-03-08
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Granted: 1983-05-31
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Expires: 2002-03-08
Abstract
Abstract Coated beads which exhibit anti-lumping properties upon pre-expansion and which are useful in the formation of soft expanded articles are prepared by coating initial polystyrene beads, in suspension, with a coating composition comprising styrene and a macromonomer of styrene and isoprene or styrene and butadiene, the coating compositions added to the suspension as an aqueous emulsion containing a catalyst and a polyoxyethylene ether of nonylphenol or octylphenol as surfactant.
Inventors
- 👤 Elizabeth A. Blommers
- 👤 David R. Warfel
- 👤 Alvin R. Ingram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:23
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J9/18; C08F; C08F257/00; C08F257/02; C08F290/00; C08F290/02; C08F290/04; C08F290/048; C08J2351/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
A composition of coated beads which exhibit antilumping properties upon preexpansion wherein each bead comprises a core of styrenic polymer bead and a coating of a copolymer of 75 to 90 percent by weight of a styrenic monomer and 2 to 25 percent by weight of a conjugated diene-styrene macromonomer which is an anionically prepared polymer of molecular weight between 5,000 and 50,000 terminated with a reactive monofunctional polymerizable group; said core comprising from 50 to 90 percent by weight of the coated bead and said coating comprising from 2 to 50 percent by weight of the coated bead; and said bead containing a blowing agent sufficient to expand the bead on heating.
Claim 2
Dependent Claim
113 words
A composition of coated beads which exhibit antilumping properties upon preexpansion wherein each bead comprises a core of styrenic polymer bead and a coating of a copolymer of 75 to 90 percent by weight of a styrenic monomer and 2 to 25 percent by weight of a conjugated diene-styrene macromonomer which is an anionically prepared polymer of molecular weight between 5,000 and 50,000 terminated with a reactive monofunctional polymerizable group; said core comprising from 50 to 90 percent by weight of the coated bead and said coating comprising from 2 to 50 percent by weight of the coated bead; and said bead containing a blowing agent sufficient to expand the bead on heating.
Claim 3
Dependent Claim
22 words
The composition of claim 1 wherein said conjugated diene-styrene macromonomer comprises a macromonomer of styrene and isoprene terminated by a methacrylyl group.
Claim 4
Dependent Claim
22 words
The composition of claim 1 wherein said conjugated diene-styrene macromonomer comprises a macromonomer of styrene and butadiene terminated by a methacrylyl group.
Claim 5
Dependent Claim
22 words
The composition of claim 1 wherein said conjugated diene-styrene macromonomer comprises a macromonomer of styrene and isoprene terminated by an acrylyl group.
Claim 6
Dependent Claim
22 words
The composition of claim 1 wherein said conjugated diene-styrene macromonomer comprises a macromonomer of styrene and butadiene terminated by an acrylyl group.
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) | 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 |