US4994524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber modified reaction moldable nylon-6 compositions
Assignee: Monsanto Co
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Filing: 1988-07-27
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Granted: 1991-02-19
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Expires: 2008-07-27
Abstract
Abstract Dispersions of core-shell polymers in caprolactam wherein the core-shell polymer comprises a crosslinked elastomer core and a hard thermoplastic shell prepared by adding an aqueous dispersion of core-shell polymer to an aqueous solution of caprolactam, stirring the mixture to provide a uniform dispersion and evaporating water from the mixture. Such dispersions can be combined with caprolactam polymerization initiator and caprolactam polymerization catalyst to provide rubber-modified nylon-6 polymers.
Inventors
- 👤 Kishore Udipi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:12
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20; C08F; C08F291/00; C08F291/02; C08L; C08L77/00; C08L77/02; Y; Y10; Y10S; Y10S525/00; Y10S525/902
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
69 words
A process for the preparation of a dispersion in caprolactam of a core-shell polymer consisting of a crosslinked rubber core and a thermoplastic polymer shell having a glass transition temperature of at least 35° C., which comprises adding an aqueous dispersion of said core-shell polymer to an aqueous solution of caprolactam, stirring the mixture to provide a uniform dispersion, and evaporating water from the mixture to provide said dispersion.
Claim 2
Dependent Claim
69 words
A process for the preparation of a dispersion in caprolactam of a core-shell polymer consisting of a crosslinked rubber core and a thermoplastic polymer shell having a glass transition temperature of at least 35° C., which comprises adding an aqueous dispersion of said core-shell polymer to an aqueous solution of caprolactam, stirring the mixture to provide a uniform dispersion, and evaporating water from the mixture to provide said dispersion.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the water is evaporated at a temperature of about 90° to 100° C. with a nitrogen stream.
Claim 4
Dependent Claim
104 words
The process of claim 1 wherein after the water is evaporated, there is added a caprolactam-soluble polymerization-initiating amount of caprolactam polymerization initiator selected from the group represented by the formula ##STR8## where A is CO, CS, B(CO) x , B(CS) x , B(NHCO) x , ##STR9## where B is a C 1 to C 30 hydrocarbyl radical, where x is in the range of 2 to 4,where R is a C 4 to C 11 alkylene or oxoalkylene radical, R 1 is hydrogen or a C 1 to C 4 alkyl radical and R 2 is a C 1 to C 10 hydrocarbyl radical.
Claim 5
Dependent Claim
35 words
The process of claim 1 wherein after the water is evaporated, there is added an effective amount of a caprolactam polymerization catalyst selected from the group consisting of lactam magnesium halides and alkali metal lactamates.
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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) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |