Patent US4981931A successfully refreshed from Google Patents.
US4981931A
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Discrete tungsten complexes as oxygen and water resistant DCPD polymerization catalysts
Assignee: Metton America Inc
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Filing: 1989-02-24
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Granted: 1991-01-01
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Expires: 2009-02-24
Abstract
Abstract This invention is a process for preparing a polymer which comprises contacting pure dicyclopentadiene with a pure tungsten catalyst complex, such as WCl 3 (2,6-diisopropylphenoxy) 3 , when tributyl tin hydride or triphenyl tin hydride is used as the activator for the polymerization. This process affords a method of polymerization of dicyclopentadiene in which the mixture gels slowly without the use of a rate moderator at 80° C. (in from about 15 seconds to as much as two minutes or more) and furthermore cures quite slowly (in about 3-6 minutes). This delay makes these compositions particularly applicable to reaction injection molding processes. Moreover, both the tungsten complexes and the tin activator compounds employed in this invention are relatively insensitive to oxygen and water.
Inventors
- 👤 Andrew Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:43
CPC Classifications
C; C08; C08F; C08F4/00; C08G; C08G61/00; C08G61/02; C08G61/04; C08G61/06; C08G61/08; B; B01; B01J; B01J31/00; B01J31/02; B01J31/0201; B01J31/0211; B01J31/0214; B01J31/12; B01J31/122; B01J2531/00; B01J2531/60; B01J2531/66; B01J31/16; B01J31/22; B01J31/2204; B01J31/2208; B01J31/2226; B01J31/26; B01J31/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
126 words
A process for preparing molded polymeric articles from a strained ring non-conjugated polycyclic cycloolefin monomer comprising combining said monomer with a tungsten catalyst complex having the formula ##STR8## wherein X is Cl or Br, n is 2 or 3, R 1 is a H, Cl or an alkoxy group having 1 to 8 carbons, R 2 is H or an alkyl group having 1 to 9 carbons, and R 3 is H or an alkyl group having 1 to 5 carbon atoms, with an activator compound having the formula SnR 3 H wherein R is selected from the group consisting of a phenyl group and an alkyl group having 1 to 10 carbon atoms and charging said combination to a mold where polymerization will take place.
Claim 2
Dependent Claim
126 words
A process for preparing molded polymeric articles from a strained ring non-conjugated polycyclic cycloolefin monomer comprising combining said monomer with a tungsten catalyst complex having the formula ##STR8## wherein X is Cl or Br, n is 2 or 3, R 1 is a H, Cl or an alkoxy group having 1 to 8 carbons, R 2 is H or an alkyl group having 1 to 9 carbons, and R 3 is H or an alkyl group having 1 to 5 carbon atoms, with an activator compound having the formula SnR 3 H wherein R is selected from the group consisting of a phenyl group and an alkyl group having 1 to 10 carbon atoms and charging said combination to a mold where polymerization will take place.
Claim 3
Dependent Claim
88 words
The process of claim 1 wherein said tungsten catalyst complex is selected from the group consisting of WCl 2 (4-ethoxyphenoxy) 4 , WCl 2 (4-butoxyphenoxy) 4 , WCl 3 (2,6-di-tert-butylphenoxy) 3 , WCl 2 (phenoxy) 4 , WCl 2 (3-methylphenoxy) 4 , WCl 2 (4-methylphenoxy), WCl 2 (3,5-dimethylphenoxy) 4 , WCl 2 (4-butylphenoxy) 4 , WCl 2 (4-chlorophenoxy) 4 , WCl 3 (2,6-dimethyl phenoxy) 3 , WCl 3 (2,4,6-trimethylphenoxy) 3 , WCl 2 (4-phenyl phenoxy) 4 , WCl 2 (4-methoxyphenoxy) 4 , and WCl 3 (2,6-di-isopropylphenoxy) 3 .
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein said activator is selected from the group consisting of triphenyl tin hydride and tri-n-butyl tin hydride.
Claim 5
Dependent Claim
34 words
The process of claim 1 wherein said cycloolefin monomer is selected from the group consisting of dicyclopentadiene, higher cyclopentadiene oligomers, norbornene, norbornadiene, 4-alkylidene norbornenes, dimethanooctahydronaphthalene, dimethanohexahydronaphthalene, substituted derivatives of said monomers and mixtures thereof.
Claim 6
Dependent Claim
38 words
The process of claim 1 wherein said monomer gels in about 15 seconds to up to 3 minutes and cures in about 2 to 10 minutes after charging the mixture of said catalyst and activator to the mold.
Claim 7
Dependent Claim
14 words
The process of claim 4 wherein said dicyclopentadiene monomer is at least 99% pure.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
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