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US3968015A
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Poly(tetramethyleneterephthalate) crosslinked by irradiation
Assignee: Raychem Corp
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Filing: 1973-10-11
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Granted: 1976-07-06
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Expires: 1993-10-11
Abstract
Abstract Crosslinking, e.g., by irradiation, of a polymer comprising poly(tetramethyleneterephthalate) is made possible by the addition of N,N'-m-phenylenedimaleimide. The resulting crosslinked modified polymer may be rendered heat recoverable.
Inventors
- 👤 David D. Nyberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:45
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/24; B; B29; B29C; B29C61/00; B29C61/003; C08G; C08G63/00; C08G63/91; C08G63/914; C08G63/916; B29K; B29K2067/00; C08J2367/00; C08J2367/02; Y; Y10; Y10S; Y10S174/00; Y10S174/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
48 words
A process for crosslinking poly(tetramethyleneterephthalate) comprising subjecting poly(tetramethyleneterephthalate) containing at least one part per 100 of N,N'-m-phenylenedimaleimide to irradiation with ionizing radiation to a dose of from about 2 to about 80 megarads and to a heating step wherein said heat may be applied during or after irradiation.
Claim 2
Dependent Claim
48 words
A process for crosslinking poly(tetramethyleneterephthalate) comprising subjecting poly(tetramethyleneterephthalate) containing at least one part per 100 of N,N'-m-phenylenedimaleimide to irradiation with ionizing radiation to a dose of from about 2 to about 80 megarads and to a heating step wherein said heat may be applied during or after irradiation.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said heating is performed during irradiation.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein said heating is performed immediately after irradiation.
Claim 5
Dependent Claim
36 words
A composition comprising crosslinked poly(tetramethyleneterephthalate) wherein said composition is crosslinked with at least one part per 100 of N,N'-m-phenylenedimaleimide by being irradiated with ionizing radiation to a dose of from about 2 to about 80 megarads.
Claim 6
Dependent Claim
36 words
A composition comprising crosslinked poly(tetramethyleneterephthalate) wherein said composition is crosslinked with at least one part per 100 of N,N'-m-phenylenedimaleimide by being irradiated with ionizing radiation to a dose of from about 2 to about 80 megarads.
Claim 7
Dependent Claim
46 words
A composition comprising a blend of poly(tetramethyleneterephthalate) and a block copolymer of polytetramethyleneether and poly(tetramethyleneterephthalate) containing at least one part per 100 of N,N'-m-phenylenedimaleimide wherein said composition is crosslinked by being irradiated with ionizing radiation to a dose of from about 2 to about 80 megarads.
Claim 8
Dependent Claim
46 words
A composition comprising a blend of poly(tetramethyleneterephthalate) and a block copolymer of polytetramethyleneether and poly(tetramethyleneterephthalate) containing at least one part per 100 of N,N'-m-phenylenedimaleimide wherein said composition is crosslinked by being irradiated with ionizing radiation to a dose of from about 2 to about 80 megarads.
Claim 9
Dependent Claim
41 words
A heat recoverable article comprising crosslinked poly(tetramethyleneterephthalate) wherein the poly(Tetramethyleneterephthalate) of said article is crosslinked with at least one part per 100 of N,N'-m-phenylenedimaleimide by being irradiated with ionizing radiation to a dose of from about 2 to about 80 megarads.
Claim 10
Dependent Claim
41 words
A heat recoverable article comprising crosslinked poly(tetramethyleneterephthalate) wherein the poly(Tetramethyleneterephthalate) of said article is crosslinked with at least one part per 100 of N,N'-m-phenylenedimaleimide by being irradiated with ionizing radiation to a dose of from about 2 to about 80 megarads.
Claim 11
Dependent Claim
53 words
A heat recoverable article comprising a blend of poly(tetramethyleneterephthalate) and a block copolymer of poly(tetramethyleneether) and poly(tetramethylene-terephthalate) wherein the blend of polymers of said article is crosslinked with at least one part per 100 of N,N'-phenylenedimaleimide by being irradiated with ionizing radiation to a dose of from about 2 to about 80 megarads.
Claim 12
Dependent Claim
53 words
A heat recoverable article comprising a blend of poly(tetramethyleneterephthalate) and a block copolymer of poly(tetramethyleneether) and poly(tetramethylene-terephthalate) wherein the blend of polymers of said article is crosslinked with at least one part per 100 of N,N'-phenylenedimaleimide by being irradiated with ionizing radiation to a dose of from about 2 to about 80 megarads.
Claim 13
Dependent Claim
32 words
The process comprising admixing poly(tetramethyleneterephthalate) and at least one part per 100 of N,N'-m-phenylenedimaleimide and exposing the mixture to a dose of ionizing radiation of from about 2 to about 80 megarads.
Claim 14
Dependent Claim
32 words
The process comprising admixing poly(tetramethyleneterephthalate) and at least one part per 100 of N,N'-m-phenylenedimaleimide and exposing the mixture to a dose of ionizing radiation of from about 2 to about 80 megarads.
Claim 15
Dependent Claim
17 words
The process of claim 8 wherein said composition contains at least one part per hundred of N,N'-m-phenylenedimaleimide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |