Patent US4002713A successfully refreshed from Google Patents.
US4002713A
Expired / Lapsed
US
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Cementing compositions and concretes and mortars derived therefrom
Assignee: Imperial Chemical Industries Ltd
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Filing: 1974-10-07
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Granted: 1977-01-11
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Expires: 1994-10-07
Abstract
Abstract Concretes and mortars having improved mechanical properties and resistance to chemicals are obtained by incorporating vinyl polymers or copolymers into cementing compositions and effecting curing (after a period of initial setting) at an elevated temperature.
Inventors
- 👤 Frederic James Duncan
- 👤 Ronald George Chappell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:49
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/26; C04B24/2641; C04B28/00; C04B28/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
85 words
A method of preparation of a pre-cast shaped concrete article which comprises casting and curing a cementing composition initially including an inorganic cement, and an aqueous emulsion or dispersion of a water-insoluble polymer or copolymer derived from one or more alkyl methacrylates having from 1 to 8 carbon atoms in the alkyl group, the said polymer or copolymer having a glass transition temperature of at least 10° C. and the curing being effected, after initial setting, at an elevated temperature of at least 40° C.
Claim 2
Independent Claim
85 words
A method of preparation of a pre-cast shaped concrete article which comprises casting and curing a cementing composition initially including an inorganic cement, and an aqueous emulsion or dispersion of a water-insoluble polymer or copolymer derived from one or more alkyl methacrylates having from 1 to 8 carbon atoms in the alkyl group, the said polymer or copolymer having a glass transition temperature of at least 10° C. and the curing being effected, after initial setting, at an elevated temperature of at least 40° C.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein the curing temperature is at least 50° C.
Claim 4
Dependent Claim
17 words
A method according to claim 2 wherein the curing temperature is from 50° C. to 200° C.
Claim 5
Dependent Claim
17 words
A method according to claim 3 wherein the curing temperature is from 70° C. to 160° C.
Claim 6
Dependent Claim
15 words
A method according to claim 1 wherein the curing temperature is at least 90° C.
Claim 7
Dependent Claim
19 words
A method according to claim 1 wherein the curing period at the elevated temperature is at least 12 hours.
Claim 8
Dependent Claim
17 words
A method according to claim 1 wherein the period of initial setting is at least 12 hours.
Claim 9
Dependent Claim
16 words
A method according to claim 1 wherein the initial setting is effected at substantially ambient temperature.
Claim 10
Dependent Claim
32 words
A method according to claim 1 wherein the proportion of polymer or copolymer (calculated on a dry basis) is from 5% to 50% by weight of the cement component of the composition.
Claim 11
Dependent Claim
22 words
A method according to claim 9 wherein the proportion of polymer or copolymer is from 15% to 35% of the cement component.
Claim 12
Dependent Claim
48 words
A method according to claim 1 wherein there is employed a copolymer derived from one or more alkyl methacrylates having from 1 to 8 carbon atoms in the alkyl group and from one or more alkyl acrylates having from 1 to 8 carbon atoms in the alkyl group.
Claim 13
Dependent Claim
16 words
A method according to claim 1 wherein the polymer or copolymer is derived from methyl methacrylate.
Claim 14
Dependent Claim
28 words
A method according to claim 11 wherein the polymer is a homopolymer of methyl methacrylate or a copolymer containing at least 65% by weight of methyl methacrylate units.
Claim 15
Dependent Claim
18 words
A method according to claim 11 wherein there is employed a copolymer of methyl methacrylate and 2-ethylhexyl acrylate.
Claim 16
Dependent Claim
20 words
A method according to claim 11 wherein there is employed a copolymer of methyl methacrylate, 2-ethylhexyl acrylate and acrylic acid.
Claim 17
Dependent Claim
21 words
A method according to claim 1 wherein the polymer or copolymer has a glass transition temperature of at least 20° C.
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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) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |