Patent US4507453A successfully refreshed from Google Patents.
US4507453A
Expired / Lapsed
US
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Dicyclopentadiene thermoset polymer
Assignee: Metton America Inc
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Filing: 1983-05-25
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Granted: 1985-03-26
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Expires: 2003-05-25
Abstract
Abstract A high impact strength, high modulus thermoset homopolymer is formed by the metathesis-catalyzed polymerization of dicyclopentadiene. In a preferred embodiment of the synthesis, two parts of a metathesis-catalyst system, a catalyst/monomer solution and an activator/monomer solution, are combined in the mixing head of a reaction injection molding machine and then injected into a mold. The reaction mixture sets up into a tough, rigid, thermoset polymer with high modulus and excellent impact strength.
Inventors
- 👤 Glenn M. Tom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:45
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/04; C08G61/06; C08G61/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
152 words
A method of mold forming substantially cross-linked thermoset homopolymer product comprising polymerized units of dicyclopentadiene from dicyclopentadiene monomer comprising: (a) providing a mold means having a polymerization chamber; (b) providing a polymerization solution comprising dicyclopentadiene monomer, activator and catalyst, said dicyclopentadiene comprising a substantial majority on a weight percent basis of said polymerization solution; (c) polymerizing in about 0.5 minute said polymerization solution in said polymerization chamber of said mold means to form a substantially cross-linked homopolymer product comprising polymerized units of dicyclopentadiene, said crosslinking being effective to characterize said homopolymer as having a flexural modulus of at least 150,000 psi at ambient temperature, a notched Izod impact strength of at least about 1.5 ft. lb./in. notch, and a percent gel swell, determined after the polymer is immersed in toluene for two hours at 100° C. of less than about 200%, said homopolymer product having substantially the form of said reaction chamber.
Claim 2
Independent Claim
152 words
A method of mold forming substantially cross-linked thermoset homopolymer product comprising polymerized units of dicyclopentadiene from dicyclopentadiene monomer comprising: (a) providing a mold means having a polymerization chamber; (b) providing a polymerization solution comprising dicyclopentadiene monomer, activator and catalyst, said dicyclopentadiene comprising a substantial majority on a weight percent basis of said polymerization solution; (c) polymerizing in about 0.5 minute said polymerization solution in said polymerization chamber of said mold means to form a substantially cross-linked homopolymer product comprising polymerized units of dicyclopentadiene, said crosslinking being effective to characterize said homopolymer as having a flexural modulus of at least 150,000 psi at ambient temperature, a notched Izod impact strength of at least about 1.5 ft. lb./in. notch, and a percent gel swell, determined after the polymer is immersed in toluene for two hours at 100° C. of less than about 200%, said homopolymer product having substantially the form of said reaction chamber.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein said dicyclopentadiene monomer is purified dicyclopentadiene.
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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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |