US4356222A
Expired / Lapsed
US
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Fusion-bondable sheet
Assignee: Ube Corp
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Filing: 1981-10-02
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Granted: 1982-10-26
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Expires: 2001-10-02
Abstract
Abstract A fusion-bondable sheet is provided which is used as an overtape for covering a joint portion of a heat-shrinkable cover sheet applied onto a joint of steel pipe or cable and which is also used as a cover sheet for repairing a damaged protecting cover of a steel pipe. The fusion-bondable sheet comprises (a) a crosslinked polyolefin sheet, (b) a fusion-bondable layer formed on one surface of the crosslinked polyolefin sheet, which layer is mainly composed of a polyolefin having a melting point of 80°-200° C., a polyolefin having a melting point of 30°-75° C. and a tackifier, and (c) a flame-retardant sheet bonded to the other surface of the crosslinked polyolefin sheet through a binder or adhesive layer. Preferably, the flame-retardant sheet is larger in size than the crosslinked polyolefin sheet and the edges of the former sheet outwardly extend from the edges of the latter sheet.
Inventors
- 👤 Hiroshi Harakawa
- 👤 Youtaro Fujiwara
- 👤 Masaaki Matsushita
- 👤 Seiko Tsutsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:15
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B29; B29C; B29C61/00; B29C61/06; B29C61/0608; B29C61/0616; B29C61/10; B32B15/00; B32B15/04; B32B15/08; B32B27/06; B32B27/08; B32B27/16; B32B7/00; B32B7/04; B32B7/12; C; C08; C08J; C08J5/00; C08J5/12; C08J5/124; C08J5/128; C09; C09J; C09J7/00; C09J7/20; C09J7/22; C09J7/30; C09J7/35; F; F16; F16L; F16L47/00; F16L47/20; F16L47/22; F16L55/00; F16L55/16; F16L55/168; F16L55/17; F16L58/00; F16L58/18; F16L58/181; B29K; B29K2023/00; B29K2105/00; B29K2105/06; B29K2105/24; B29K2705/00; B29K2705/02; B29K2995/00; B29K2995/0012; B29K2995/0016; B29L; B29L2009/00; B32B2262/00; B32B2262/10; B32B2305/00; B32B2305/72; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/3065; C08J2323/00; C08J2323/02; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/269; Y10T428/28; Y10T428/2813; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
A fusion-bondable sheet comprising a crosslinked polyolefin sheet, a fusion-bondable layer formed on one surface of the crosslinked polyolefin sheet, which layer is composed of a composition comprising as the main components a polyolefin having a melting point of 80° to 200° C., a polyolefin having a melting point of 30° to 75° C. and a tackifier, and a flame-retardant sheet bonded to the other surface of the crosslinked polyolefin sheet through a layer of a binder or adhesive.
Claim 2
Dependent Claim
79 words
A fusion-bondable sheet comprising a crosslinked polyolefin sheet, a fusion-bondable layer formed on one surface of the crosslinked polyolefin sheet, which layer is composed of a composition comprising as the main components a polyolefin having a melting point of 80° to 200° C., a polyolefin having a melting point of 30° to 75° C. and a tackifier, and a flame-retardant sheet bonded to the other surface of the crosslinked polyolefin sheet through a layer of a binder or adhesive.
Claim 3
Dependent Claim
34 words
A fusion-bondable sheet according to claim 1 wherein the crosslinked polyolefin sheet is prepared by irradiating a polyolefin with radio active rays and has a degree of gel fraction of at least about 20%.
Claim 4
Dependent Claim
27 words
A fusion-bondable sheet according to claim 2 wherein the polyolefin is selected from the group consisting of polyethylene, polypropylene, an ethylene-propylene copolymer and an ethylene-vinyl acetate copolymer.
Claim 5
Dependent Claim
23 words
A fusion-bondable sheet according to claim 1 wherein the crosslinked polyolefin sheet has a thickness of from about 0.05 to about 2 mm.
Claim 6
Dependent Claim
46 words
A fusion-bondable sheet according to claim 1 wherein the fusion-bondable layer is composed of a composition comprising as the main components a polyolefin having a melting point of 100° to 180° C., a polyolefin having a melting point of 35° to 70° C. and a tackifier.
Claim 7
Dependent Claim
59 words
A fusion-bondable sheet according to claim 1 or 5 wherein the amounts of the high-melting-point polyolefin (A), the low-melting-point polyolefin (B) and the tackifier (C) are such that the ratio of (B)/(A) is in the range of from 0.05 to 5 by weight and the ratio of (C)/[(A)+(B)] is in the range of from 0.2 to 5 by weight.
Claim 8
Dependent Claim
20 words
A fusion-bondable sheet according to claim 1 wherein the fusion-bondable layer has a thickness of about 50 to 1500 microns.
Claim 9
Dependent Claim
42 words
A fusion-bondable sheet according to claim 1 wherein the polyolefin having a melting point of 80° to 200° C. is selected from the group consisting of polyethylene, polypropylene, an ethylene-vinyl acetate copolymer, an ethylene-propylene compolymer, an ethylene-acrylic acid copolymer and modified polyethylenes.
Claim 10
Dependent Claim
43 words
A fusion-bondable sheet according to claim 1 wherein the polyolefin having a melting point of 30° to 75° C. is selected from the group consisting of an ethylene-propylene copolymer, an ethylene-vinyl acetate copolymer, a low-molecular weight polyethylene, a low-molecular weight polypropylene and waxes.
Claim 11
Dependent Claim
54 words
A fusion-bondable sheet according to claim 1 wherein the tackifier is selected from the group consisting of a petroleum hydrocarbon resin, a coumarone-indene resin, a coumarone resin, a terpene resin, an aromatic hydrocarbon resin, natural resin and its derivatives, polybutene, natural rubber, polyisoprene rubber, polybutadiene rubber, styrene-butadiene copolymer rubber and ethylene-propylene-nonconjugated diene copolymer rubber.
Claim 12
Dependent Claim
33 words
A fusion-bondable sheet according to claim 1 wherein the flame-retardant sheet is selected from metal foils and plastic sheets having inorganic fibers dispersed therein and has a thickness of 0.01 to 2 mm.
Claim 13
Dependent Claim
50 words
A fusion-bondable sheet according to claim 1 wherein the flame-retardant sheet having the binder or adhesive layer has a size larger than that of the crosslinked polyolefin sheet, and the edges of the flame-retardant sheet outwardly extend from the edges of the crosslinked polyolefin sheet by 0.5 to 10 cm.
Claim 14
Dependent Claim
19 words
A fusion-bondable sheet according to claim 12 wherein said binder or adhesive layer is composed of a pressure-sensitive adhesive.
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) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |