US4443496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Agent and method for modifying surface layer of cement structures
Assignee: Nissan Chemical Corp
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Filing: 1982-07-22
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Granted: 1984-04-17
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Expires: 2002-07-22
Abstract
Abstract An agent and method for modifying a surface layer of hardened cement structures or substrates with use of the agent which comprises in a specified ratio of an alkali silicate solution and a sodium naphthalenesulfonate-formaldehyde condensate. Said agent has an excellent stability and a remarkable permeability into the cement structure to form a deeper strengthened surface layer thereon.
Inventors
- 👤 Masamichi Obitsu
- 👤 Takahiro Hori
- 👤 Toyoji Koinuma
- 👤 Yuriko Sakaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:22
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5076; C04B41/5089; C04B41/60; C04B41/61; C04B41/65; C04B41/68
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
114 words
A method for modifying a surface layer of cement structures, which comprises steps of applying on surface of the structure an agent comprising 100 parts by weight of an alkali silicate solution and 0.01 to 5 parts by weight of a condensate of sodium naphthalenesulfonate and formaldehyde, in which said alkali silicate solution has a SiO 2 /M 2 O mole ratio of 1 to 50, wherein M represents an alkali metal atom, or a substituted or unsubstituted ammonium cationic radical, and has a SiO 2 content of 1 to 50 weight %, impregnating the surface layer of said structure with said agent, and then leaving to stand or positively drying the treated structure.
Claim 2
Independent Claim
114 words
A method for modifying a surface layer of cement structures, which comprises steps of applying on surface of the structure an agent comprising 100 parts by weight of an alkali silicate solution and 0.01 to 5 parts by weight of a condensate of sodium naphthalenesulfonate and formaldehyde, in which said alkali silicate solution has a SiO 2 /M 2 O mole ratio of 1 to 50, wherein M represents an alkali metal atom, or a substituted or unsubstituted ammonium cationic radical, and has a SiO 2 content of 1 to 50 weight %, impregnating the surface layer of said structure with said agent, and then leaving to stand or positively drying the treated structure.
Claim 3
Dependent Claim
34 words
The method as claimed in claim 1, wherein said alkali silicate is any of silicates of lithium, potassium, sodium, methylammonium, dimethylammonium, dimethyldiethanolammonium, triethanolammonium, tetraethanolammonium, diethylammonium, ethylpropanolammonium and ethyltriethanolammonium, or any combination of such silicates.
Claim 4
Dependent Claim
19 words
The method as claimed in claim 1, wherein said condensate has a polymerization degree ranging from 1 to 100.
Claim 5
Dependent Claim
69 words
The method as claimed in claim 1, wherein said agent comprises 100 parts by weight of lithium silicate solution and 0.02 to 1 part by weight of said condensate having a polymerization degree ranging from 3 to 50, in which said lithium silicate solution has a SiO 2 /M 2 O mole ratio of 2 to 7 and has a SiO 2 content of 5 to 30 weight %.
Claim 6
Dependent Claim
24 words
The method as claimed in claim 1, wherein said cement structure is made from any of hardened cement, mortar, concrete and calcium silicate board.
Claim 7
Dependent Claim
16 words
The method as claimed in claim 5, wherein said structure is in the form of wall.
Claim 8
Dependent Claim
16 words
The method as claimed in claim 6, wherein said wall structure has a deteriorated surface layer.
Claim 9
Independent Claim
136 words
A method for repairing a deteriorated surface layer of cement structures, which comprises steps of applying on the deteriorated surface of the cement structure an agent comprising 100 parts by weight of an alkali silicate solution and 0.01 to 50 parts by weight of a condensate of sodium naphthalenesulfonate and formaldehyde, in which said alkali silicate solution has a SiO 2 /M 2 O mole ratio of 1 to 50, wherein M represents an alkali metal atom, or a substituted or unsubstituted ammonium cationic radical, and has a SiO 2 content of 1 to 50 weight %, impregnating the surface layer of said structure with said agent, leaving to stand or positively drying the treated structure, applying a freshly prepared cement material on the treated surface of said structure, and then curing the applied cement material.
Claim 10
Independent Claim
136 words
A method for repairing a deteriorated surface layer of cement structures, which comprises steps of applying on the deteriorated surface of the cement structure an agent comprising 100 parts by weight of an alkali silicate solution and 0.01 to 50 parts by weight of a condensate of sodium naphthalenesulfonate and formaldehyde, in which said alkali silicate solution has a SiO 2 /M 2 O mole ratio of 1 to 50, wherein M represents an alkali metal atom, or a substituted or unsubstituted ammonium cationic radical, and has a SiO 2 content of 1 to 50 weight %, impregnating the surface layer of said structure with said agent, leaving to stand or positively drying the treated structure, applying a freshly prepared cement material on the treated surface of said structure, and then curing the applied cement material.
Claim 11
Dependent Claim
34 words
The method as claimed in claim 8, wherein said alkali silicate is any of silicates of lithium, potassium, sodium, methylammonium, dimethylammonium, dimethyldiethanolammonium, triethanolammonium, tetraethanolammonium, diethylammonium, ethylpropanolammonium and ethyltriethanolammonium, or any combination of such silicates.
Claim 12
Dependent Claim
19 words
The method as claimed in claim 8, wherein said condensate has a polymerization degree ranging from 1 to 100.
Claim 13
Dependent Claim
69 words
The method as claimed in claim 8, wherein said agent comprises 100 parts by weight of lithium silicate solution and 0.02 to 1 part by weight of said condensate having a polymerization degree ranging from 3 to 50, in which said lithium silicate solution has a SiO 2 /M 2 O mole ratio of 2 to 7 and has a SiO 2 content of 5 to 30 weight %.
Claim 14
Dependent Claim
24 words
The method as claimed in claim 8, wherein said cement structure is made from any of hardened cement, mortar, concrete and calcium silicate board.
Claim 15
Dependent Claim
16 words
The method as claimed in claim 12, wherein said structure is in the form of wall.
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) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |