US4726869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive and method of jointing articles of polyolefin using the same
Assignee: Dainichi Nippon Cables Ltd
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Filing: 1985-09-30
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Granted: 1988-02-23
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Expires: 2005-09-30
Abstract
Abstract An adhesive, suitable for joining cured polyolefin articles, comprising a water curable polyolefin having a melt index of from 0.1 to 20, and a method of joining cured polyolefin articles, especially cured polyethylene pipes, comprising a step to apply the above adhesive to the surface of the articles and a step to join both of the surfaces to each other with the melt of the adhesive.
Inventors
- 👤 Masatake Matsui
- 👤 Chiaki Momose
- 👤 Kazunori Terasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:48
CPC Classifications
C; C09; C09J; C09J151/00; C09J151/06; B; B29; B29C; B29C65/00; B29C65/48; B29C65/52; B29C65/02; B29C65/18; B29C65/20; B29C65/4805; B29C65/483; B29C66/00; B29C66/01; B29C66/02; B29C66/024; B29C66/0242; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5221; B29C66/70; B29C66/71; B29C66/73; B29C66/737; B29C66/7375; B29C66/73755; B29C66/73756; B29C66/739; B29C66/7394; B29C66/73941; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91411; B29C66/919; B29C66/9192; B29C66/91921; B29C66/91931; B29C66/91933; C09J123/00; C09J123/02; C09J123/04; C09J123/08; C09J123/0807; C09J123/0815; C09J123/0846; C09J123/0853; C09J123/0869; C09J123/16; B29C65/481; B29C65/4815; B29C65/484; B29C66/7392; B29C66/73921; B29C66/91441; B29C66/91443; B29C66/91445; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2105/00; B29K2105/24; C08; C08L; C08L2205/00; C08L2205/02; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/08; C08L23/0807; C08L23/0815; C08L23/16; C08L2666/00; C08L2666/02; C08L2666/04; C08L2666/06; Y; Y10; Y10S; Y10S285/00; Y10S285/915
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
102 words
A method for joining polyolefin piping elements at least one of whose surfaces to be joined have a gel fraction of at least 20% by weight, which comprises applying an adhesive comprising a water curable polyolefin having a melt index of 0.1 to 20 to one or both of the above surfaces, said adhesive being applied in a melted state, and placing both of the surfaces in contact with each other and water curing the adhesive to obtain a bond which will withstand an internal water pressure which is at least as high as the rupture pressure of the polyolefin piping element.
Claim 2
Independent Claim
102 words
A method for joining polyolefin piping elements at least one of whose surfaces to be joined have a gel fraction of at least 20% by weight, which comprises applying an adhesive comprising a water curable polyolefin having a melt index of 0.1 to 20 to one or both of the above surfaces, said adhesive being applied in a melted state, and placing both of the surfaces in contact with each other and water curing the adhesive to obtain a bond which will withstand an internal water pressure which is at least as high as the rupture pressure of the polyolefin piping element.
Claim 3
Dependent Claim
65 words
A method of claim 1, which comprises in turn a step to apply said adhesive heated at a temperature of at least T o , and a step to heat both of said surfaces at a temperature of at least (T o +20)°C., and a step to join both of said surfaces, wherein T o being a melting point (°C.) of said water curable polyolefin.
Claim 4
Dependent Claim
29 words
A method of claim 2, wherein both of said surfaces are heated at a temperature of at least T o °C. in advance said step to apply said adhesive.
Claim 5
Dependent Claim
27 words
A method of claim 1, 2, or 3, wherein heating both of said surfaces are conducted by contacting with a metallic heater held at a high temperature.
Claim 6
Dependent Claim
15 words
A method of claim 2, wherein said two polyolefin elements are two cured polyolefin pipes.
Claim 7
Dependent Claim
20 words
A method of claim 2, wherein said two polyolefin elements are a cured polyolefin pipe and a cured polyolefin joint.
Claim 8
Dependent Claim
17 words
A method of claim 5, wherein said two cured polyolefin pipes are two water cured polyethylene pipes.
Claim 9
Dependent Claim
27 words
A method of claim 6, wherein said cured polyolefin pipe is a water cured polyethylene pipe and said cured polyolefin joint is a water cured polyethylene joint.
Claim 10
Dependent Claim
42 words
A method of claim 6, wherein before said step to join, the outer surface of said cured polyolefin pipe and the inner surface of said cured polyolefin joint are heated at a temperature of from (T o +50)°C. to (T o +180)°C.
Claim 11
Dependent Claim
24 words
A method of claim 2, wherein heating both of said surfaces are conducted by contacting with a metallic heater held at a high temperature.
Claim 12
Dependent Claim
24 words
A method of claim 3, wherein heating both of said surfaces are conducted by contacting with a metallic heater held at a high temperature.
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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) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-22 | 1999-08-24 | 2000-02-23 | $7700.00 | Window Closed / Lapsed |