Patent US4634615A successfully refreshed from Google Patents.
US4634615A
Expired / Lapsed
US
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Heat recoverable coextruded articles
Assignee: Tyco International Ltd Bermuda
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Filing: 1985-04-04
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Granted: 1987-01-06
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Expires: 2005-04-04
Abstract
Abstract A heat recoverable tubular composite article comprising an inner layer comprising a crosslinked elastomeric polymeric material having a modulus at 100% elongation at 20 DEG C. of about 40 to about 900 pounds per square inch and an outer layer comprising a thermoplastic material having a 2% secant modulus at 20 DEG C. of about 5,000 to about 100,000 pounds per square inch said composite article (1) being formed by coextrusion, (2) having a direct bond between said layers with a peel strength of at least 6 pounds per linear inch, and (3) being in a radically expanded configuration, said thermoplastic outer layer being capable of retaining the elastomeric inner layer in an expanded configuration at ambient temperature and incapable of retaining the elastomeric layer in an expanded configuration at a temperature above a predetermined temperature thereby permitting the composite article to recover to or toward its unexpanded configuration.
Inventors
- 👤 Willem M. Versteegh
- 👤 Lester T. Toy
- 👤 Christine Holland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:13
CPC Classifications
B; B29; B29C; B29C61/00; B29C61/06; B29C61/0608; B29C61/0616; B29C61/065; B29K; B29K2021/00; B29K2023/00; B29K2101/00; B29K2101/12; B29K2105/00; B29K2105/24; B29L; B29L2023/00; Y; Y10; Y10S; Y10S174/00; Y10S174/08; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
155 words
A heat-recoverable tubular composite article comprising: (a) an inner layer comprising a crosslinked elastomeric polymeric material having a modulus at 100% elongation at 20° C. of about 40 to about 900 pounds per square inch; and (b) an outer layer comprising a thermoplastic material having a 2% secant modulus at 20° C. of about 5,000 to about 100,000 pounds per square inch; said composite article (1) being formed by coextrusion, (2) having a direct bond maintaining said layers permanently bonded together, said bond having a peel strength of at least 6 pounds per linear inch, and (3) being in a radially expanded configuration, said thermoplastic outer layer being capable of retaining the elastomeric inner layer in an expanded configuration at ambient temperature and incapable of retaining the elastomeric layer in an expanded configuration at an elevated temperature thereby permitting both layers of said composite article to recover, when heated, to or toward its unexpanded configuration.
Claim 2
Dependent Claim
155 words
A heat-recoverable tubular composite article comprising: (a) an inner layer comprising a crosslinked elastomeric polymeric material having a modulus at 100% elongation at 20° C. of about 40 to about 900 pounds per square inch; and (b) an outer layer comprising a thermoplastic material having a 2% secant modulus at 20° C. of about 5,000 to about 100,000 pounds per square inch; said composite article (1) being formed by coextrusion, (2) having a direct bond maintaining said layers permanently bonded together, said bond having a peel strength of at least 6 pounds per linear inch, and (3) being in a radially expanded configuration, said thermoplastic outer layer being capable of retaining the elastomeric inner layer in an expanded configuration at ambient temperature and incapable of retaining the elastomeric layer in an expanded configuration at an elevated temperature thereby permitting both layers of said composite article to recover, when heated, to or toward its unexpanded configuration.
Claim 3
Dependent Claim
32 words
An article according to claim 1 wherein the elastomeric-polymeric material is from about 10 to about 30 milimeters diameter prior to expansion and from about 30 to about 60 milimeters after expansion.
Claim 4
Dependent Claim
21 words
An article according to claim 1 wherein the thermoplastic layer is from about 4 to about 6 milimeters thick before expansion.
Claim 5
Dependent Claim
13 words
An article according to claim 1 wherein the thermoplastic material has been crosslinked.
Claim 6
Dependent Claim
34 words
An article according to claim 1 wherein the modulus at 100% elongation at 20° C. for the inner layer is from about 70 pounds per square inch to about 200 pounds per square inch.
Claim 7
Dependent Claim
17 words
An article according to claim 1 wherein the article is radially expanded from about 20% to 400%.
Claim 8
Dependent Claim
25 words
An article according to claim 1 wherein the 2% secant modulus of the inner layer is from about 15,000 to 60,000 pounds per square inch.
Claim 9
Dependent Claim
15 words
An article according to claim 1 wherein the outer layer is an ethelene/vinyl acetyle polymer.
Claim 10
Dependent Claim
14 words
An article according to claim 1 wherein the outer layer is ethelene/ethyl acrylate polymer.
Claim 11
Dependent Claim
12 words
An article according to claim 1 wherein the outer layer is polyethylene.
Claim 12
Dependent Claim
14 words
An article according to claim 1 wherein the inner layer is an ethelene/propylene copolymer.
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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |