US5298300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-shrinkable tubing and process for producing the same
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1991-12-31
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Granted: 1994-03-29
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Expires: 2011-12-31
Abstract
Abstract Heat-shrinkable two-layer tubing comprising (a) an outer layer comprising a crosslinked resin composition comprising a fluorine-containing resin containing a vinylidene fluoride unit as a base polymer and a polyfunctional monomer containing at least two unsaturated double bonds in the molecule thereof, and (b) an inner layer having provided on the inner wall of the outer layer comprising a fluorine-containing resin composition. The tubing is excellent in heat resistance and chemical resistance and exerts an excellent sealing effect on heating.
Inventors
- 👤 Norihiro Hosoi
- 👤 Tomoyoshi Kishimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:10
CPC Classifications
B; B29; B29C; B29C61/00; B29C61/06; B29C61/0608; B29C61/0616; B32; B32B; B32B1/00; B32B1/08; B32B27/00; B32B27/06; B32B27/08; B32B27/16; B32B27/30; B32B27/304; B32B38/00; B32B38/0008; B29C61/08; B29K; B29K2027/00; B29K2027/12; B32B2307/00; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2327/00; B32B2327/12; B32B2327/18; B32B2597/00; Y; Y10; Y10S; Y10S174/00; Y10S174/08; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1334; Y10T428/24; Y10T428/24942; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
Heat-shrinkable two-layer tubing comprising: (a) an outer layer comprising a crosslinked fluorine-containing resin composition comprising a fluorine-containing resin containing a vinylidene fluoride unit as a base polymer and a polyfunctional monomer containing at least two unsaturated double bonds in the molecule thereof, and (b) an inner layer provided on the inner wall of said outer layer consisting essentially of a fluorine-containing resin composition which (1) has a melting point of not higher than 110° C. as measured by means of a differential scanning calorimeter with a rise in temperature, (2) has a fluorine-containing resin containing a vinylidene fluoride unit, and (3) is non-crosslinked.
Claim 2
Dependent Claim
103 words
Heat-shrinkable two-layer tubing comprising: (a) an outer layer comprising a crosslinked fluorine-containing resin composition comprising a fluorine-containing resin containing a vinylidene fluoride unit as a base polymer and a polyfunctional monomer containing at least two unsaturated double bonds in the molecule thereof, and (b) an inner layer provided on the inner wall of said outer layer consisting essentially of a fluorine-containing resin composition which (1) has a melting point of not higher than 110° C. as measured by means of a differential scanning calorimeter with a rise in temperature, (2) has a fluorine-containing resin containing a vinylidene fluoride unit, and (3) is non-crosslinked.
Claim 3
Dependent Claim
23 words
Heat-shrinkable two-layer tubing as claimed in claim 1, wherein said fluorine-containing resin containing a vinylidene fluoride unit is a vinylidene fluoride/hexafluoropropylene/ tetrafluoroethylene terpolymer.
Claim 4
Dependent Claim
24 words
Heat-shrinkable two-layer tubing as claimed in claim 1, wherein said polyfunctional monomer is trimethylolpropane acrylate, triallyl isocyanurate, triallyl cyanurate, trimethylolethane methacrylate, or trimethylolpropane methacrylate.
Claim 5
Dependent Claim
35 words
Heat-shrinkable two-layer tubing as claimed in claim 1, wherein said polyfunctional monomer is present in a proportion of from 0.1 to 20 parts by weight per 100 parts by weight of said fluorine-containing resin composition.
Claim 6
Dependent Claim
26 words
Heat-shrinkable two-layer tubing as claimed in claim 1, wherein said fluorine-containing resin composition constituting the inner layer has a melt index of not less than 10.
Claim 7
Dependent Claim
44 words
Heat-shrinkable two-layer tubing as claimed in claim 1, wherein said fluorine-containing resin composition constituting the inner layer is a vinylidene fluoride/hexafluoropropylene/ tetrafluoroethylene terpolymer having a weight ratio of the repeating units of 60 to 80/5 to 15/15 to 25 with the total being 100.
References Cited (Backward Citations)
GB1250503A
Cited
US3861972A
Cited
GB1440524A
Cited
GB2046032A
Cited
EP0063913A2
Cited
US4693940A
Cited
US4634615A
Cited
JPS6125822A
Cited
JPH0259325A
Cited
US5059480A
Cited
US5143761A
Cited
JPH02200434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-28 | 1997-09-27 | 1998-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-28 | 2001-09-27 | 2002-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-28 | 2005-09-27 | 2006-03-29 | $7700.00 | Window Closed / Lapsed |