US4587279A
Expired / Lapsed
US
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Cementitious building material incorporating end-capped polyethylene glycol as a phase change material
Assignee: University of Dayton
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Filing: 1984-08-31
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Granted: 1986-05-06
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Expires: 2004-08-31
Abstract
Abstract A cementitious composition comprising a cementitious material and polyethylene glycol or end-capped polyethylene glycol as a phase change material, said polyethylene glycol and said end-capped polyethylene glycol having a molecular weight greater than about 400 and a heat of fusion greater than about 30 cal/g; the compositions are useful in making pre-formed building materials such as concrete blocks, brick, dry wall and the like or in making poured structures such as walls or floor pads; the glycols can be encapsulated to reduce their tendency to retard set.
Inventors
- 👤 Ival O. Salyer
- 👤 Charles W. Griffen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:21
CPC Classifications
F; F28; F28D; F28D20/00; F28D20/02; F28D20/023; C; C04; C04B; C04B20/00; C04B20/10; C04B20/1018; C04B20/1029; C04B24/00; C04B24/24; C04B24/28; C04B24/32; C04B28/00; C04B28/02; C08; C08K; C08K3/00; C08K3/01; C08K3/013; C04B2103/00; C04B2103/0068; C04B2103/0071; Y; Y02; Y02E; Y02E60/00; Y02E60/14; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249994; Y10T428/249995; Y10T428/249997
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
72 words
A cementitious composition useful in the manufacture of building materials comprising an inorganic cementitious building material and an end-capped polyethylene glycol dispersed therein as a phase change material, said end-capped polyethylene glycol having a molecular weight greater than about 400 and a heat of fusion greater than about 30 cal/g, wherein said end-capped polyethylene glycol is selected from the group consisting of alkoxy-capped polyethylene glycol, urethane-capped polyethylene glycol, and ester-capped polyethylene glycol.
Claim 2
Dependent Claim
72 words
A cementitious composition useful in the manufacture of building materials comprising an inorganic cementitious building material and an end-capped polyethylene glycol dispersed therein as a phase change material, said end-capped polyethylene glycol having a molecular weight greater than about 400 and a heat of fusion greater than about 30 cal/g, wherein said end-capped polyethylene glycol is selected from the group consisting of alkoxy-capped polyethylene glycol, urethane-capped polyethylene glycol, and ester-capped polyethylene glycol.
Claim 3
Dependent Claim
23 words
The composition of claim 1 wherein said cementitious material is selected from the group consisting of portland cement, gypsum, and plaster of Paris.
Claim 4
Dependent Claim
16 words
The cementitious composition of claim 1 wherein said phase change material is a di-end-capped polyethylene glycol.
Claim 5
Dependent Claim
17 words
The cementitious composition of claim 3 wherein said phase change material is a methoxy end-capped polyethylene glycol.
Claim 6
Dependent Claim
23 words
The cementitious composition of claim 1 wherein said end-capped polyethylene glycol has a molecular weight in the range of about 600 to 1500.
Claim 7
Dependent Claim
29 words
The cementitious composition of claim 2 wherein said cementitious material is portland cement and said end-capped polyethylene glycol is present in an amount up to about 5% by weight.
Claim 8
Dependent Claim
30 words
The cementitious composition of claim 2 wherein said cementitious material is plaster of Paris and said end-capped polyethylene glycol is present in an amount up to about 20% by weight.
Claim 9
Dependent Claim
37 words
The cementitious composition of claim 1 wherein said phase change material is a blend of end-capped polyethylene glycols having distinct melting points such that said blend exhibits two distinct melting points and two distinct heats of fusion.
Claim 10
Dependent Claim
49 words
The cementitious composition of claim 8 wherein said blend comprises end-capped polyethylene glycol having a first molecular weight of 1000 or less and an end-capped polyethylene glycol having a second molecular weight and the difference between said first molecular weight and said second molecular weight is at least 2000.
Claim 11
Dependent Claim
69 words
The cementitious composition of claim 2 wherein said end-capped polyethylene glycol is incorporated into said cementitious composition in the form of a pellet or granule, said pellet or granule being formed from a polymer material having said phase change material dissolved and/or dispersed therein, wherein said polymer material is other than said end-capped polyethylene glycol and said polymer material isolates the dispersed phase change material from the cementitious composition.
Claim 12
Dependent Claim
15 words
The cementitious composition of claim 10 wherein said polymer is a natural or synthetic rubber.
Claim 13
Dependent Claim
41 words
The cementitious composition of claim 10 wherein said polymer is selected from the group consisting of nylons, polyesters, polyvinyl alcohol, polyvinyl acetate, ethylene vinylacetate copolymer, butadiene-acrylonitrile copolymer, acrylate and methacrylate rubbers, neoprene, natural rubber, butyl rubber, polybutadiene, butadiene/styrene copolymers and EPDM.
Claim 14
Dependent Claim
14 words
The cementitious composition of claim 10 wherein said polymeric material is crosslinked or uncrosslinked.
Claim 15
Dependent Claim
18 words
The cementitious composition of claim 13 wherein said phase change material is end-capped by reaction with a polyisocyanate.
Claim 16
Dependent Claim
65 words
A building block comprising an inorganic cementitious matrix having dispersed therein an end-capped polyethylene glycol as a phase change material, said end-capped polyethylene glycol having a molecular weight greater than about 400 and a heat of fusion greater than about 30 cal/g , wherein said end-capped polyethylene glycol is selected from the group consisting of alkoxy-capped polyethylene glycol, urethane-capped polyethylene glycol, and ester-capped polyethylene glycol.
Claim 17
Dependent Claim
65 words
A building block comprising an inorganic cementitious matrix having dispersed therein an end-capped polyethylene glycol as a phase change material, said end-capped polyethylene glycol having a molecular weight greater than about 400 and a heat of fusion greater than about 30 cal/g , wherein said end-capped polyethylene glycol is selected from the group consisting of alkoxy-capped polyethylene glycol, urethane-capped polyethylene glycol, and ester-capped polyethylene glycol.
Claim 18
Dependent Claim
20 words
The building block of claim 15 wherein said end-capped polyethylene glycol has a molecular weight of about 600 to 1500.
Claim 19
Dependent Claim
61 words
A dry wall comprising, gypsum and an end-capped polyethylene glycol dispersed therein as a phase change material, said end-capped polyethylene glycol having a molecular weight greater than about 400 and a heat of fusion greater than about 30 cal/g, wherein said end-capped polyethylene glycol is selected from the group consisting of alkoxy-capped polyethylene glycol, urethane-capped polyethylene glycol, and ester-capped polyethylene glycol.
Claim 20
Dependent Claim
61 words
A dry wall comprising, gypsum and an end-capped polyethylene glycol dispersed therein as a phase change material, said end-capped polyethylene glycol having a molecular weight greater than about 400 and a heat of fusion greater than about 30 cal/g, wherein said end-capped polyethylene glycol is selected from the group consisting of alkoxy-capped polyethylene glycol, urethane-capped polyethylene glycol, and ester-capped polyethylene glycol.
Claim 21
Dependent Claim
20 words
The dry wall of claim 17 wherein said end-capped polyethylene glycol has a molecular weight of about 600 to 1500.
Claim 22
Dependent Claim
11 words
A bridge deck prepared from the cementitious composition of claim 1.
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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) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |