US4693940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminate and method of preparing same
Assignee: Tyco International Ltd Bermuda
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Filing: 1984-03-30
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Granted: 1987-09-15
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Expires: 2004-03-30
Abstract
Abstract In a laminate comprising adjacent layers composed of incompatible polymers, the adhesion between the layers is enhanced by irradiation of the laminate, and can be further enhanced by high temperature annealing of the irradiated laminate.
Inventors
- 👤 Christine E. Vogdes
- 👤 Yutaka Kawazoye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:45
CPC Classifications
B; B32; B32B; B32B38/00; B32B38/0036; B32B27/00; B32B27/06; B32B27/08; B32B2310/00; B32B2310/08; B32B2310/0875; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
120 words
A method of preparing a laminate comprising a first layer composed of a first polymeric composition and an adherent second layer composed of a second polymeric composition, which method comprises (1) preparing a laminate comprising a layer of a first radiation cross-linkable polymeric composition and an adjacent layer of a second radiation cross-linkable polymeric composition which is incompatible with the first composition, the laminate being prepared by a process in which the interface between the layers is heated to a temperature which is higher than the melting point of at least one of the polymers in at least one of the compositions; and (2) irradiating the laminate prepared in step (1) to effect cross-linking of said first and second compositions.
Claim 2
Independent Claim
120 words
A method of preparing a laminate comprising a first layer composed of a first polymeric composition and an adherent second layer composed of a second polymeric composition, which method comprises (1) preparing a laminate comprising a layer of a first radiation cross-linkable polymeric composition and an adjacent layer of a second radiation cross-linkable polymeric composition which is incompatible with the first composition, the laminate being prepared by a process in which the interface between the layers is heated to a temperature which is higher than the melting point of at least one of the polymers in at least one of the compositions; and (2) irradiating the laminate prepared in step (1) to effect cross-linking of said first and second compositions.
Claim 3
Dependent Claim
46 words
A method according to claim 1 which comprises deforming the irradiated laminate at a temperature which is higher than the melting point of at least one of the polymers in at least one of the compositions, and cooling the deformed laminate, thereby preparing a heat-recoverable article.
Claim 4
Dependent Claim
19 words
A method according to claim 1 wherein at least one of the polymeric compositions contains a radiation cross-linking agent.
Claim 5
Dependent Claim
36 words
A method according to claim 1 wherein in step (1), the interface is heated to a temperature which is higher than the melting point of at least one of the polymers in each of the compositions.
Claim 6
Dependent Claim
37 words
A method according to claim 1 which comprises (3) heat-treating the irradiated laminate at a temperature which is higher than the melting point of at least one of the polymers in at least one of the compositions.
Claim 7
Dependent Claim
36 words
A method according to claim 5 wherein in step (3), the laminate is heat-treated at a temperature which is higher than the melting point of at least one of the polymers in each of the compositions.
Claim 8
Dependent Claim
30 words
A method according to claim 5 wherein the product of step (3) has a peel strength which is at least twice the peel strength of the product of step (1).
Claim 9
Dependent Claim
23 words
A method according to claim 1 wherein the first composition comprises at least one polymer which is selected from fluoropolymers, polyolefins and polyamides.
Claim 10
Dependent Claim
14 words
A method according to claim 8 wherein the first composition also contains an elastomer.
Claim 11
Dependent Claim
13 words
A method according to claim 8 wherein the first composition comprises polyvinylidene fluoride.
Claim 12
Dependent Claim
13 words
A method according to claim 1 wherein the first composition comprises an elastomer.
Claim 13
Dependent Claim
13 words
A method according to claim 11 wherein the second composition comprises an elastomer.
Claim 14
Dependent Claim
14 words
A method according to claim 1 wherein each of the layers is electrically insulating.
Claim 15
Dependent Claim
9 words
A laminate prepared by the method of claim 1.
Claim 16
Dependent Claim
10 words
A heat-recoverable laminate prepared by the method of claim 2.
Claim 17
Dependent Claim
43 words
A process for providing an electrically insulating covering over a substrate which comprises surrounding the substrate with an electrically insulating, heat-shrinkable laminate prepared by the method of claim 2, and heating the laminate to cause it to shrink into contact with the substrate.
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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) | 1990-09-14 | 1991-03-16 | 1991-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-14 | 1995-03-16 | 1995-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-14 | 1999-03-16 | 1999-09-15 | $7700.00 | Window Closed / Lapsed |