US5053446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefin composites containing a phase change material
Assignee: University of Dayton
•
Filing: 1989-03-03
•
Granted: 1991-10-01
•
Expires: 2009-03-03
Abstract
Abstract A composite useful in thermal energy storage, said composite being formed of a polyolefin matrix having a phase change material such as a crystalline alkyl hydrocarbon incorporated therein, said polyolefin being thermally form stable; the composite is useful in forming pellets, sheets or fibers having thermal energy storage characteristics; methods for forming the composite are also disclosed.
Inventors
- 👤 Ival O. Salyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:34
CPC Classifications
F; F28; F28D; F28D20/00; F28D20/02; F28D20/023; C; C08; C08K; C08K5/00; C08K5/01; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/10; C08K3/00; C08K3/34; C08K3/36; C08K5/04; C08K5/14; C08L2312/00; C08L2312/06; C08L91/00; C08L91/06; Y; Y02; Y02E; Y02E60/00; Y02E60/14; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
A composite useful in thermal energy storage, said composite being thermally form stable and being formed of a first material and a second material which is different from said first material, and which has a melting point less than said first material, but which is compatible with said first material, said first material comprising a crosslinked or uncrosslinked polyolefin matrix which serves as a containment means for said second material, and said second material comprising a crystalline alkyl hydrocarbon phase change material having a heat of fusion greater than about 30 cal./g. and a melting and a freezing point in the range of 0 to 80° C., said second material being contained within the matrix of said first material, thereby forming said composite.
Claim 2
Dependent Claim
123 words
A composite useful in thermal energy storage, said composite being thermally form stable and being formed of a first material and a second material which is different from said first material, and which has a melting point less than said first material, but which is compatible with said first material, said first material comprising a crosslinked or uncrosslinked polyolefin matrix which serves as a containment means for said second material, and said second material comprising a crystalline alkyl hydrocarbon phase change material having a heat of fusion greater than about 30 cal./g. and a melting and a freezing point in the range of 0 to 80° C., said second material being contained within the matrix of said first material, thereby forming said composite.
Claim 3
Dependent Claim
17 words
The composite of claim 1 wherein said polyolefin is polyethylene, polypropylene, polybutene, crystalline polystyrene, or poly (4-methyl-pentene-1).
Claim 4
Dependent Claim
13 words
The composite of claim 2 wherein said polyolefin is crosslinked high density polyethylene.
Claim 5
Dependent Claim
41 words
The composite of claim 3 wherein said high density polyethylene is crosslinked to such a degree that said polyolefin matrix is form stable and said polyolefin matrix is capable of absorbing at least 10% by weight of said phase change material.
Claim 6
Dependent Claim
29 words
The composite of claim 1 wherein said composite is in a form selected from the group consisting of a pellet, a film or sheet, and a fiber or strand.
Claim 7
Dependent Claim
43 words
The composite of a claim 1 wherein said phase change material is imbibed into said polylefin matrix by immersing said polyolefin matrix into a hot melt of said phase change material at a temperature higher than the crystalline melt point of said polyolefin.
Claim 8
Dependent Claim
29 words
The composite of claim 1 wherein aid polyolefin is crosslinked high density polyethylene, said phase change material is a crystalline alkyl hydrocarbon and said composite is in pellet form.
Claim 9
Dependent Claim
28 words
The composite of claim 5 wherein said composite is in pellet form and further including a non-polymeric cemetitious material into which said composite in pellet form is dispersed.
Claim 10
Dependent Claim
33 words
The composite of claim 8 wherein said polyolefin is cross-linked higher density polyethylene, said phase change material is a crystalline alkyl hydrocarbon, and said cementitious material is in the form of gypsum board.
References Cited (Backward Citations)
US3823089A
Cited
US3603106A
Cited
US3639189A
Cited
US4045515A
Cited
US4259198A
Cited
US4003426A
Cited
FR2368529A1
Cited
US4182398A
Cited
US4253983A
Cited
JPS5442380A
Cited
US4273667A
Cited
EP0022717A1
Cited
US4463799A
Cited
DE3045842A1
Cited
US4470917A
Cited
US4545916A
Cited
JPS59142276A
Cited
US4505953A
Cited
JPS59170180A
Cited
US4504402A
Cited
US4513053A
Cited
JPS59232164A
Cited
JPS6086191A
Cited
JPS6086188A
Cited
US4561989A
Cited
US4711813A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-30 | 1995-04-01 | 1995-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-30 | 1999-04-01 | 1999-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-30 | 2003-04-01 | 2003-10-01 | $7700.00 | Window Closed / Lapsed |