US4452838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-shrinkable tubes
Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1982-08-25
•
Granted: 1984-06-05
•
Expires: 2002-08-25
Abstract
Abstract A heat-shrinkable tube is described. The tube is characterized by a resin composition which contains from 5 to 80% by weight of a graft copolymer, and chlorinated polyethylene having a crystal proportion of from 1 to 25%. The graft copolymer is prepared by graft-copolymerizing polyvinyl chloride to an ethylene-vinyl acetate copolymer having a vinyl acetate content of at least 50% by weight.
Inventors
- 👤 Keiji Ueno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:37
CPC Classifications
B; B29; B29C; B29C61/00; B29C61/003; C; C08; C08L; C08L51/00; C08L51/04; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/08; B29K2023/083; Y; Y10; Y10S; Y10S174/00; Y10S174/08; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1331
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
89 words
A heat-shrinkable tube prepared by molding a resin composition in a tubular form, irradiating the tube with electron rays to cross-link it, and expanding the cross-linked tube, the resin composition comprising a base polymer composition consisting of from 5 to 80% by weight of a graft copolymer, and 95 to 20% by weight of chlorinated polyethylene having a crystallinity of from 1 to 25%, said graft copolymer being prepared by graft-copolymerizing polyvinyl chloride to an ethylene-vinyl acetate copolymer having a vinyl acetate content of at least 50% by weight.
Claim 2
Dependent Claim
89 words
A heat-shrinkable tube prepared by molding a resin composition in a tubular form, irradiating the tube with electron rays to cross-link it, and expanding the cross-linked tube, the resin composition comprising a base polymer composition consisting of from 5 to 80% by weight of a graft copolymer, and 95 to 20% by weight of chlorinated polyethylene having a crystallinity of from 1 to 25%, said graft copolymer being prepared by graft-copolymerizing polyvinyl chloride to an ethylene-vinyl acetate copolymer having a vinyl acetate content of at least 50% by weight.
Claim 3
Dependent Claim
22 words
The heat-shrinkable tube as claimed in claim 1, wherein said resin composition contains 10 to 50% by weight of the graft copolymer.
Claim 4
Dependent Claim
22 words
The heat-shrinkable tube as claimed in claim 1, wherein said resin composition contains 10 to 20% by weight of the graft copolymer.
Claim 5
Dependent Claim
20 words
The heat-shrinkable tube as claimed in claim 1, wherein said graft copolymer has a vinyl acetate content of about 60%.
Claim 6
Dependent Claim
17 words
The heat-shrinkable tube as claimed in claim 1, wherein the resin composition further contains a polyfunctional monomer.
Claim 7
Dependent Claim
19 words
The heat-shrinkable tube as claimed in claim 5, wherein said polyfunctional monomer has 3 or more reactive double bonds.
Claim 8
Dependent Claim
30 words
The heat-shrinkable tube as claimed in claim 6, wherein said polyfunctional monomer is selected from the group consisting of a triacrylate, a trimethacrylate, a triacryl cyanurate and a triacyl isocyanurate.
Claim 9
Dependent Claim
34 words
The heat-shrinkable tube as claimed in claim 5, wherein said polyfunctional monomer is contained in an amount of 3 to 20 parts by weight per 100 parts by weight of the base polymer composition.
Claim 10
Dependent Claim
34 words
The heat-shrinkable tube as claimed in claim 8, wherein said polyfunctional monomer is contained in an amount of 5 to 10 parts by weight per 100 parts by weight of the base polymer composition.
Claim 11
Dependent Claim
15 words
The heat-shrinkable tube as claimed in claim 1, wherein the resin composition further contains 2,2-di(4-bromoethoxy-3,5-dibromophenyl)propane.
Claim 12
Dependent Claim
31 words
The heat-shrinkable tube as claimed in claim 10, wherein said 2,2-di(4-bromoethoxy-3,5-dibromophenyl)propane is contained in an amount of 10 parts by weight per 100 parts by weight of the base polymer composition.
References Cited (Backward Citations)
US3040385A
Cited
US3580829A
Cited
US3644578A
Cited
US3705210A
Cited
US3767606A
Cited
US4220730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |