US3890253A
Expired / Lapsed
US
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Reversibly crosslinked polymers
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1974-02-27
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Granted: 1975-06-17
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Expires: 1994-02-27
Abstract
Abstract Reversible cross-linking is imparted to polymers and copolymers, especially of the vinyl, olefinic, and olefinic oxide types by means of recurring dicyclopentadiene linkages. Difunctional dicyclopentadiene compounds can be polymerized directly into homopolymers or polymerized with comonomers to form copolymers. Alternatively, polymers carrying cyclopentadiene substituents can be prepared and the dimerization of the cyclopentadiene groups effected in situ to produce the cross-linkages. The dicyclopentadiene cross-linkages cleave on heating to a sufficient temperature so that the present polymers and copolymers have a thermoplastic character notwithstanding their normal cross-linked network structure.
Inventors
- 👤 Yasuhiro Takeshita
- 👤 Michitake Uoi
- 👤 Yoshiyuki Hirai
- 👤 Mitsuru Uchiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:19
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/329; C08G65/337; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/24; C08G65/04; C08G65/06; C08G65/16; C08G65/20; C08G65/22; C08G65/24; C07; C07C; C07C2601/00; C07C2601/06; C07C2601/10; C07C2603/00; C07C2603/56; C07C2603/58; C07C2603/60; C07C2603/66; C07C2603/68; C08F; C08F2800/00; C08F2800/20; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
14 words
A SELF-CURING POLYETHER CHARACTERIZED IN THAT IT CONTAINS RECURRING UNITS OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
14 words
A SELF-CURING POLYETHER CHARACTERIZED IN THAT IT CONTAINS RECURRING UNITS OF THE GENERAL FORMULA:
Claim 3
Dependent Claim
26 words
A process for producing the polyether of claim 1 which comprises reacting a polymer or copolymer of an epihalohydrin with an alkali metal compound of cyclopentadiene.
References Cited (Backward Citations)
US3645917A
Cited
US3817876A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |