Patent US4952348A successfully refreshed from Google Patents.
US4952348A
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Process for preparing shaped article having thick section
Assignee: Zeon Corp
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Filing: 1988-09-12
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Granted: 1990-08-28
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Expires: 2008-09-12
Abstract
Abstract Process for preparing a pore-free polynorbornene product by bulk polymerizing a monomer charge containing at least one norbornene monomer having tricyclic or higher cyclic structure with a metathesis catalyst by controlling maximum exotherm temperature to a level of 160° C. or below or by controlling the temperature difference to 80° C. or below between the inner and exterior temperatures during the cooling period of said product from the maximum exotherm to the glass transition temperature of said product.
Inventors
- 👤 Yoshiharu Ishimaru
- 👤 Motoyuki Yamato
- 👤 Koji Chono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:11
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/04; C08G61/06; C08G61/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
A process for the preparation of a substantially pore-free shaped article having a thick section, composed of polycyclic norbornene polymer, which comprises bulk-polymerizing a monomer charge selected from norbornene monomers having tricycle and higher cyclic structures with a metathesis catalyst in a mold, and cooling the polymerization product while controlling the temperature difference between the interior of the polymerization product and the exterior of the polymerization product below 80° C. during the cooling period spanning from the maximum exotherm temperature to the glass transition temperature of the polymerization product.
Claim 2
Dependent Claim
89 words
A process for the preparation of a substantially pore-free shaped article having a thick section, composed of polycyclic norbornene polymer, which comprises bulk-polymerizing a monomer charge selected from norbornene monomers having tricycle and higher cyclic structures with a metathesis catalyst in a mold, and cooling the polymerization product while controlling the temperature difference between the interior of the polymerization product and the exterior of the polymerization product below 80° C. during the cooling period spanning from the maximum exotherm temperature to the glass transition temperature of the polymerization product.
Claim 3
Dependent Claim
19 words
The process according to claim 1, wherein the shaped article has a diameter thickness of at least 20 mm.
Claim 4
Dependent Claim
52 words
The process according to claim 1, wherein the shaped article has a glass transition temperature of at least 80° C. and an ignition loss of less than 5% by weight as determined at a temperature of 400° C. in a nitrogen atmosphere and at a temperature-elevating rate of 20° C. per minute.
Claim 5
Dependent Claim
50 words
The process according to claim 1, wherein the bulk polymerization of the norbornene monomer is carried out further with of at least 5% by weight, based on the weight of the monomer, of an antioxidant, and the resulting polycyclic norbornene polymer has an ignition point of at least 120° C.
Claim 6
Dependent Claim
38 words
The process according to claim 4, wherein said monomer charge contains at least 10% by weight, based on the weight of said monomer charge of a crosslinking monomer which is bulk-polymerized to obtain a thermoset polycyclic norbornene polymer.
Claim 7
Dependent Claim
18 words
The process according to claim 5, wherein the shaped article having a thick section is a machinable stock.
Claim 8
Dependent Claim
17 words
The process of claim 1 wherein the shaped article has a thickness of at least 50 mm.
Claim 9
Dependent Claim
102 words
A process for the preparation of a substantially pore-free shaped article having a thick section, composed of polycyclic norbornene polymer which comprises bulk-polymerizing a monomer charge selected from norbornene monomers having a tricyclic and higher cyclic structures with a metathesis catalyst, in the presence of at least 5% by weight of an antioxidant and at least 30% by weight of a crosslinking monomer, based on the weight of said monomer charge, in a mold while controlling maximum curing exotherm temperature to a level of 160° C. and below whereby the thermoset polycyclic norbornene polymer has ignition point of at least 120° C.
Claim 10
Dependent Claim
102 words
A process for the preparation of a substantially pore-free shaped article having a thick section, composed of polycyclic norbornene polymer which comprises bulk-polymerizing a monomer charge selected from norbornene monomers having a tricyclic and higher cyclic structures with a metathesis catalyst, in the presence of at least 5% by weight of an antioxidant and at least 30% by weight of a crosslinking monomer, based on the weight of said monomer charge, in a mold while controlling maximum curing exotherm temperature to a level of 160° C. and below whereby the thermoset polycyclic norbornene polymer has ignition point of at least 120° C.
Claim 11
Dependent Claim
18 words
The process according to claim 8, wherein the shaped article having a thick section is a machinable stock.
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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) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |