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US4654085A
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Additive for cementitious compositions
Assignee: Henkel AG and Co KGaA
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Filing: 1985-09-11
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Granted: 1987-03-31
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Expires: 2005-09-11
Abstract
Abstract An additive for cementitious compositions is provided comprised of a cellulose ether, a starch ether and a polyacrylamide. This additive, when added to cementitious compositions, improves the workability of the resulting cementitious composition when used as a tile grout or mortar.
Inventors
- 👤 Erhard Schinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:03
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B24/383; C04B28/00; C04B28/02; C04B28/04; C04B2111/00; C04B2111/00034; C04B2111/00094; C04B2111/00474; C04B2111/00663; C04B2111/00672
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
42 words
A composition useful as an additive to impart sag resistance in cementitious compositions, said additive comprising: (a) a cellulose ether, (b) a starch ether, and (c) a polyacrylamide wherein the weight ratios of cellulose ether, starch ether and polyacrylamide range from 95-75:20-5:1.
Claim 2
Dependent Claim
42 words
A composition useful as an additive to impart sag resistance in cementitious compositions, said additive comprising: (a) a cellulose ether, (b) a starch ether, and (c) a polyacrylamide wherein the weight ratios of cellulose ether, starch ether and polyacrylamide range from 95-75:20-5:1.
Claim 3
Dependent Claim
14 words
A compostion in accordance with claim 1 wherein the weight ratio ranges from 90-85:15-10:1.
Claim 4
Dependent Claim
13 words
The composition in accordance with claim 2 wherein the weight ratio is 89:10:1.
Claim 5
Dependent Claim
27 words
A composition in accordance with claim 1 wherein the cellulose ether will yield a 2% aqueous solution having a Brookfield viscosity of about 10,000 cP or greater.
Claim 6
Dependent Claim
27 words
A composition in accordance with claim 4 wherein the cellulose ether will yield a 2% aqueous solution having a Brookfield viscosity of about 15,000 cP or greater.
Claim 7
Dependent Claim
27 words
A composition in accordance with claim 5 wherein the cellulose ether will yield a 2% aqueous solution having a Brookfield viscosity of about 20,000 cP or greater.
Claim 8
Dependent Claim
15 words
A composition in accordance with claim 1 wherein the cellulose ether is an alkylhydroxyalkyl cellulose.
Claim 9
Dependent Claim
33 words
A composition in accordance with claim 7 wherein the cellulose ether has an alkyl D.S. of from about 0.9 to about 3 and a hydroxyalkyl M.S. of from about 0.05 to about 4.
Claim 10
Dependent Claim
18 words
A composition as defined in claim 8 wherein the hydroxyalkyl M.S. is from about 0.05 to about 0.9.
Claim 11
Dependent Claim
29 words
A composition in accordance with claim 8 wherein the alkyl D.S. ranges from about 1.7 to about 1.9 and the hydroxyalkyl M.S. ranges from about 0.1 to about 0.2.
Claim 12
Dependent Claim
15 words
A composition in accordance with claim 8 wherein the cellulose ether is a methylhydroxypropyl cellulose.
Claim 13
Dependent Claim
25 words
A composition in accordance with claim 11 wherein the cellulose ether will yield a 2% aqueous solution having a Brookfield viscosity of about 20,000 cP.
Claim 14
Dependent Claim
15 words
A composition in accordance with claim 8 wherein the cellulose ether is a methylhydroxyethyl cellulose.
Claim 15
Dependent Claim
24 words
A composition in accordance with claim 13 wherein the cellulose ether yields a 2% aqueous solution having a Brookfield viscosity of about 6,000 cP.
Claim 16
Dependent Claim
15 words
A composition in accordance with claim 1 wherein the starch ether is an hydroxyalkyl starch.
Claim 17
Dependent Claim
22 words
A composition in accordance with claim 15 wherein the starch ether has an hydroxyalkyl M.S. of from about 0.5 to about 0.9.
Claim 18
Dependent Claim
14 words
A composition in accordance with claim 15 wherein the starch ether is hydroxypropyl starch.
Claim 19
Dependent Claim
23 words
A composition in accordance with claim 1 wherein said polyacrylamide is selected from the group consisting of anionic, cationic and non-ionic polyacrylamide polymers.
Claim 20
Dependent Claim
21 words
A composition in accordance with claim 1 wherein the polyacrylamide is a high molecular polyacrylamide that is both acidic and anionic.
Claim 21
Dependent Claim
29 words
A method of improving the anti-sag charactistics of a cementitious composition comprising mixing an effective amount of the additive of claim 1 with a composition containing a hydraulic cement.
Claim 22
Dependent Claim
29 words
A method in accordance with claim 20 wherein the effective amount of the additive is from about 0.05 to about 1.5 percent by dry weight of the cementitious composition.
Claim 23
Dependent Claim
19 words
A method in accordance with claim 21 wherein the effective amount is from about 0.2 to about 0.5 percent.
Claim 24
Dependent Claim
33 words
A cementitious composition comprising a hydraulic cement and an amount of the additive of claim 1 sufficient to improve the sag characterisitics of the cementitious composition when used as a grout or mortar.
Claim 25
Dependent Claim
24 words
A composition in accordance with claim 23 further comprising an amount of water sufficient to form a grout or mortar useful in setting tile.
Claim 26
Dependent Claim
27 words
A method of setting tile comprising contacting a tile and a substrate with an amount of the cementitious composition of claim 24 sufficient to set the tile.
Claim 27
Dependent Claim
27 words
A method in accordance with claim 25 wherein the cementitious composition is first applied to a surface and the tile is then set in the cementitious composition.
Claim 28
Dependent Claim
28 words
A method in accordance with claim 26 wherein tiles are spaced in relation to one another and the cementitious composition is applied to the areas between adjacent tiles.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-30 | 1990-09-29 | 1991-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-30 | 1994-09-29 | 1995-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-30 | 1998-09-29 | 1999-03-31 | $7700.00 | Window Closed / Lapsed |