Patent EP0307902A2 successfully refreshed from Google Patents.
EP0307902A2
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Process for preparing shaped article having thick section
Assignee: Zeon Corp
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Filing: 1988-09-15
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Granted: —
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Expires: 2008-09-15
Abstract
Abstract 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 norbornene monomer having a tricyclic or higher cyclic structure in the presence of a methathesis catalyst in a mold while controlling the maximum curing exotherm temperature of the reaction mixture to a level not exceeding 160°C.
Inventors
- 👤 Yoshiharu Ishimaru
- 👤 Motoyuki Yamato
- 👤 Koji Chono
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 16:30
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/04; C08G61/06; C08G61/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
60 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 norbornene monomer having a tricyclic or higher cyclic structure in the presence of a methathesis catalyst in a mold while controlling the maximum curing exotherm temperature of the reaction mixture to a level not exceeding 160°C.
Claim 2
Dependent Claim
60 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 norbornene monomer having a tricyclic or higher cyclic structure in the presence of a methathesis catalyst in a mold while controlling the maximum curing exotherm temperature of the reaction mixture to a level not exceeding 160°C.
Claim 3
Dependent Claim
20 words
The process according to claim 1, wherein the shaped article has a diameter or thickness of at least 20 mm.
Claim 4
Dependent Claim
48 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 smaller 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
51 words
The process according to claim 1, wherein the bulk polymerization of the norbornene monomer is carried out further in the presence 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
45 words
The process according to claim 4, wherein a monomer mixture comprising the norbornene monomer having a tricyclic or higher cyclic structure, and at least 10% by weight, based on the total monomers, of a cross-linking monomer 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
78 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 norbornene monomer having a tricyclic or higher cyclic structure in the presence of a methathesis catalyst in a mold, and cooling the polymerization product while controlling the temperature difference in the interior of the polymerization product below 80°C during the cooling period spanning from the maximum curing exotherm temperature to the glass transition temperature.
Claim 9
Dependent Claim
78 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 norbornene monomer having a tricyclic or higher cyclic structure in the presence of a methathesis catalyst in a mold, and cooling the polymerization product while controlling the temperature difference in the interior of the polymerization product below 80°C during the cooling period spanning from the maximum curing exotherm temperature to the glass transition temperature.
Claim 10
Dependent Claim
20 words
The process according to claim 7, wherein the shaped article has a diameter or thickness of at least 20 mm.
Claim 11
Dependent Claim
48 words
The process according to claim 7, wherein the shaped article has a glass transition temperature of at least 80°C and an ignition loss smaller 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 12
Dependent Claim
51 words
The process according to claim 7, wherein the bulk polymerization of the norbornene monomer is carried out further in the presence 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 13
Dependent Claim
45 words
The process according to claim 10, wherein a monomer mixture comprising the norbornene monomer having a tricyclic or higher cyclic structure, and at least 10% by weight, based on the total monomers, of a cross-linking monomer is bulk-polymerized to obtain a thermoset polycyclic norbornene polymer.
Claim 14
Dependent Claim
18 words
The process according to claim 11, wherein the shaped article having a thick section is a machinable stock.
References Cited (Backward Citations)
No citation records indexed.
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