US5169893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixtures containing stereoregular polystyrene
Assignee: Dow Chemical Co
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Filing: 1991-06-19
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Granted: 1992-12-08
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Expires: 2011-06-19
Abstract
Abstract The invention is composition useful for preparing articles from syndiotactic polystyrene, or a mixture of syndiotactic polystyrene and isotactic polystyrene which comprises a homogeneous mixture of; A. syndiotactic polystyrene, or a mixture of syndiotactic polystyrene and isotactic polystyrene; and B. a solvent for the polystyrene wherein said solvent is a liquid at temperatures at which articles can be formed from the polystyrene: wherein the mixture is viscous enough to form articles from the polystyrene.
Inventors
- 👤 Henry N. Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:08
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/20; D01F6/22; C; C08; C08K; C08K5/00; C08K5/0008
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
172 words
A composition comprising a homogeneous mixture of: A. syndiotactic polystyrene; and B. a solvent for the syndiotactic polystyrene selected from the group consisting alkyl-, cycloalkyl-, aryl-, or aralkyl-substituted pyrrolidinones; chloronaphthalene; hydrogenated or partially hydrogenated naphthalenes; diphenyl sulfone; benzyl alcohol; caprolactam; alkyl aliphatic esters containing a total of from 7 to 20 carbon atoms; alkyl or aryl substituted formamides; dicyclohexyl; terphenyls; partially hydrogenated terphenyls; mixtures of terpheylis and quaterphenyls; compounds of the formula ##STR3## wherein R 1 is cycloalkyl, halo, or nitro; R 2 is alkyl; R 3 is aryl, alkyl, carboxyaryl, or alkoxy; a is an integer of from 1 to 3; b is an integer of from 0 to 3; c is an integer of from 1 to 2; aryl substituted phenols; and ethers of the formula ##STR4## wherein R 4 is alkyl, cycloalkyl, aryl or a mixture thereof, wherein said solvent is a liquid at temperatures at which articles can be formed from the homogeneous mixture and the homogeneous mixture is viscous enough to form articles upon the quenching thereof.
Claim 2
Dependent Claim
172 words
A composition comprising a homogeneous mixture of: A. syndiotactic polystyrene; and B. a solvent for the syndiotactic polystyrene selected from the group consisting alkyl-, cycloalkyl-, aryl-, or aralkyl-substituted pyrrolidinones; chloronaphthalene; hydrogenated or partially hydrogenated naphthalenes; diphenyl sulfone; benzyl alcohol; caprolactam; alkyl aliphatic esters containing a total of from 7 to 20 carbon atoms; alkyl or aryl substituted formamides; dicyclohexyl; terphenyls; partially hydrogenated terphenyls; mixtures of terpheylis and quaterphenyls; compounds of the formula ##STR3## wherein R 1 is cycloalkyl, halo, or nitro; R 2 is alkyl; R 3 is aryl, alkyl, carboxyaryl, or alkoxy; a is an integer of from 1 to 3; b is an integer of from 0 to 3; c is an integer of from 1 to 2; aryl substituted phenols; and ethers of the formula ##STR4## wherein R 4 is alkyl, cycloalkyl, aryl or a mixture thereof, wherein said solvent is a liquid at temperatures at which articles can be formed from the homogeneous mixture and the homogeneous mixture is viscous enough to form articles upon the quenching thereof.
Claim 3
Dependent Claim
28 words
The composition of claim 1 wherein the homogeneous mixture comprises up to about 40 percent by weight syndiotactic polystyrene or a mixture of syndiotactic polystyrene and isotactic polystyrene.
Claim 4
Dependent Claim
30 words
The composition of claim 2 wherein the homogeneous mixture comprises between about 3 and about 30 weight percent of syndiotactic polystyrene or a mixture of syndiotactic polystyrene and isotactic polystyrene.
Claim 5
Dependent Claim
83 words
The composition of claim 3 wherein the solvent ,is o-dichlorobenzene, 1,2,3-trichlorobenzene. 1,2,3-trimethylbenzene, 1,2,3-trichlorobenzene, xylene, nitrobenzene, acetophenone, methyl benzoate, ethyl benzoate, diphenyl phthalate, benzil, methyl salicylate, benzophenone, cyclohexyl benzene, n-butylbenzene, n-propylbenzene, phenol. dimethyl phthalate, phenyl ethyl ether, diphenyl ether, anisole, 1-benzyl-2-pyrrolidinone, 1-cyclohexyl-2-pyrrolidinone. 1-ethyl-2-pyrrolidinone, 1-methyl-2-pyrrolidinone, 1-phenyl-2pyrrolinone, anisole, diphenyl ether, decahydronaphthalene, tetrahydronaphthalene, terphenyls, partially hydrogenated terphenyls. mixed terphenyls, quaterphenyls, chloronaphthalene, diphenyl sulfone, benzyl alcohol, caprolactam, dicyclohexyl, methyl aliphatic esters with a total of from 10 to 14 carbon atoms. N,N-dimethylacetamide, N,N-dimethylformamide, N,N-diphenylformamide or a mixture thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |