# US 2019/0169329 A1 · Norbornene cross-linked polymer and method for producing same

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- Number: US 2019/0169329 A1
- Document ID: US20190169329A1
- Status: Published application
- Kind: A1
- Application number: 16/266,378
- Filed: 2019-02-04
- Published: 2019-06-06
- Earliest claimed: 2013-09-27
- Assignees: Rimtec Corporation
- Applicants: Rimtec Corporation
- Inventors: Nobuto Kamei
- Web page: https://patentgrep.com/patent/US20190169329A1

## CPC

- C08F 132/08: having condensed rings
- C08G 61/08: of carbocyclic compounds containing one or more carbon-to-carbon double bonds in the ring
- H10W 74/47: comprising organic materials, e.g. plastics or resins
- C08G 2261/135: Cross-linked structures
- C08G 2261/3324: derived from norbornene
- C08G 2261/3325: derived from other polycyclic systems
- C08G 2261/418: Ring opening metathesis polymerisation [ROMP]
- C08G 2261/592: against heat
- C08G 2261/65: Electrical insulator
- C08G 2261/76: crosslinking
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

The present invention relates to a norbornene-based crosslinked polymer containing at least one member selected from the group consisting of dicyclopentadiene-based monomer units, tetracyclododecene-based monomer units, and tricyclopentadiene-based monomer units in an amount of 50% by mass or more, wherein the norbornene-based crosslinked polymer has a glass transition temperature of 240° C. or higher. Further, the present invention relates to a method for producing a norbomene-based crosslinked polymer as defined above, including step (1): heating a blend containing at least one member of the above monomer components, and a metathesis polymerization catalyst to a temperature lower than a deactivation temperature of the metathesis polymerization catalyst to carry out a primary curing; and step (2): heating a cured product obtained in the step (1) to a temperature equal to or higher than the deactivation temperature of the above metathesis polymerization catalyst to carry out a secondary curing.

## Claims

### Claim 1

A power semiconductor wherein semiconductor elements are encapsulated with a norbornene-based crosslinked polymer comprising tricyclopentadiene-based monomers in an amount of 50% or more of the entire monomers; and
wherein the norbornene-based crosslinked polymer has a glass transition temperature of 240° C. or higher.

### Claim 2

A method for producing a power semiconductor comprising encapsulating semiconductor elements with a norbornene-based crosslinked polymer comprising tricyclopentadiene-based monomers in an amount of 50% or more of the entire monomers,
wherein the norbornene-based crosslinked polymer has a glass transition temperature of 240° C. or higher.