US4849022A
Expired / Lapsed
US
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Method for modifying the surface of finely divided silica
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1988-10-11
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Granted: 1989-07-18
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Expires: 2008-10-11
Abstract
Abstract In the present invention, finely divided silica is treated with two types of organosilican compounds, (i) organosilicon compound having the general formula <IMAGE> wherein R is a monovalent hydrocarbon group; n is an integer having a value of 0 to 10; and Q is an alkoxy group, halogen atom, or hydroxyl group, and (ii) organosilicon compound having the general formula (R3Si)a-Z wherein R is a monovalent hydrocarbon group; a is 1 or 2; when a equals 1, Z is a hydrogen atom, halogen atom, hydroxyl group, alkoxy group, -NR12, -ONR12, or -OCOR1; when a equals 2, Z is -O-or -NR1-; and R1 is the hydrogen atom or an alkyl group. The present invention characteristically affords a finely divided silica which has a high degree of surface treatment, which provides an elevated thixotropy when mixed with organopolysiloxane, and which provides stability in long-term storage.
Inventors
- 👤 Hideki Kobayashi
- 👤 Masayuki Ohnishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:18
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/04; C08K9/06; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3081; C01; C01P; C01P2006/00; C01P2006/12; C01P2006/22; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
158 words
A method for modifying the surface of finely divided silica, which method is characterized in that a finely divided silica having a specific surface area of at least 50 m 2 /g is treated with both (i) organosilicon compound having the general formula ##STR5## wherein R is a monovalent hydrocarbon group; n is an integer having a value of 0 to 10; and Q is an alkoxy group, halogen atom, or hydroxyl group, and (ii) organosilicon compound having the general formula (R.sub.3 Si).sub.a --Z wherein R is a monovalent hydrocarbon group; a is 1 or 2; when a equals 1, Z is a hydrogen atom, halogen atom, hydroxyl group, alkoxy group, --NR 1 2 , --ONR 1 2 , or --OCOR 1 ; when a equals 2, Z is --O-- or --NR 1 --; and R 1 is the hydrogen atom or an alkyl group, said silica having a water content of from 0.2 to 7 weight percent.
Claim 2
Independent Claim
158 words
A method for modifying the surface of finely divided silica, which method is characterized in that a finely divided silica having a specific surface area of at least 50 m 2 /g is treated with both (i) organosilicon compound having the general formula ##STR5## wherein R is a monovalent hydrocarbon group; n is an integer having a value of 0 to 10; and Q is an alkoxy group, halogen atom, or hydroxyl group, and (ii) organosilicon compound having the general formula (R.sub.3 Si).sub.a --Z wherein R is a monovalent hydrocarbon group; a is 1 or 2; when a equals 1, Z is a hydrogen atom, halogen atom, hydroxyl group, alkoxy group, --NR 1 2 , --ONR 1 2 , or --OCOR 1 ; when a equals 2, Z is --O-- or --NR 1 --; and R 1 is the hydrogen atom or an alkyl group, said silica having a water content of from 0.2 to 7 weight percent.
Claim 3
Dependent Claim
20 words
The method of claim 1 in which the ratio of component (i) to component (ii) is from 1:9 to 9:1.
Claim 4
Dependent Claim
31 words
The method of claim 2 in which the total amount of component (i) and (ii) is from 1 to 80 weight parts per 100 weight parts of the finely divided silica.
Claim 5
Dependent Claim
21 words
The method of claim 1 in which the treated finely divided silica is further heated at 80° C. to 350° C.
Claim 6
Dependent Claim
21 words
The method of claim 3 in which the treated finely divided silica is further heated at 80° C. to 350° C.
Claim 7
Dependent Claim
160 words
The treated silica produced by modifying the surface of finely divided silica, which method is characterized in that a finely divided silica having a specific surface area of at least 50 m 2 /g is treated with both (i) organosilicon compound having the general formula ##STR6## wherein R is a monovalent hydrocarbon group; n is an integer having a value of 0 to 10; and Q is an alkoxy group, halogen atom, or hydroxyl group, and (ii) organosilicon compound having the general formula (R.sub.3 Si).sub.a Z wherein R is a monovalent hydrocarbon group; a is 1 or 2; when a equals 1, Z is a hydrogen atom, halogen atom, hydroxyl group, alkoxy group, --NR 1 2 , --ONR 1 2 , or --OCOR 1 ; when a equals 2, Z is --O-- or --NR 1 --; and R 1 is the hydrogen atom or an alkyl group, said silica having a water content of from 0.2 to 7 weight percent.
Claim 8
Dependent Claim
160 words
The treated silica produced by modifying the surface of finely divided silica, which method is characterized in that a finely divided silica having a specific surface area of at least 50 m 2 /g is treated with both (i) organosilicon compound having the general formula ##STR6## wherein R is a monovalent hydrocarbon group; n is an integer having a value of 0 to 10; and Q is an alkoxy group, halogen atom, or hydroxyl group, and (ii) organosilicon compound having the general formula (R.sub.3 Si).sub.a Z wherein R is a monovalent hydrocarbon group; a is 1 or 2; when a equals 1, Z is a hydrogen atom, halogen atom, hydroxyl group, alkoxy group, --NR 1 2 , --ONR 1 2 , or --OCOR 1 ; when a equals 2, Z is --O-- or --NR 1 --; and R 1 is the hydrogen atom or an alkyl group, said silica having a water content of from 0.2 to 7 weight percent.
Claim 9
Dependent Claim
64 words
The treated silica produced by the method of claim 6 in which the ratio of component (i) to component (ii) is from 1:9 to 9:1, the total amount of component (i) and (ii) is from 1 to 80 weight parts per 100 weight parts of the finely divided silica, and the treated finely divided silica is further heated at 80° C. to 350° C.
Claim 10
Independent Claim
151 words
A method for modifying the surface of finely divided silica having a specific surface area of at least 50 m 2 /g consisting of treating the silica with both (i) organosilicon compound having the general formula ##STR7## wherein R is a monovalent hydrocarbon group; n is an integer having a value of 0 to 10; and Q is an alkoxy group, halogen atom, or hydroxyl group, and (ii) organosilicon compound having the general formula (R.sup.3 Si).sub.a --Z wherein R is a monovalent hydrocarbon group; a is 1 or 2; when a equals 1, Z is a hydrogen atom, halogen atom, hydroxyl group, alkoxy group, --NR 1 2 , --ONR 1 2 , or --OCOR 1 ; when a equals 2, Z is --O-- or --NR 1 --; and R 1 is the hydrogen atom or an alkyl group, said silica having a water content of from 0.2 to 7 weight percent.
Claim 11
Independent Claim
151 words
A method for modifying the surface of finely divided silica having a specific surface area of at least 50 m 2 /g consisting of treating the silica with both (i) organosilicon compound having the general formula ##STR7## wherein R is a monovalent hydrocarbon group; n is an integer having a value of 0 to 10; and Q is an alkoxy group, halogen atom, or hydroxyl group, and (ii) organosilicon compound having the general formula (R.sup.3 Si).sub.a --Z wherein R is a monovalent hydrocarbon group; a is 1 or 2; when a equals 1, Z is a hydrogen atom, halogen atom, hydroxyl group, alkoxy group, --NR 1 2 , --ONR 1 2 , or --OCOR 1 ; when a equals 2, Z is --O-- or --NR 1 --; and R 1 is the hydrogen atom or an alkyl group, said silica having a water content of from 0.2 to 7 weight percent.
Claim 12
Dependent Claim
38 words
The method of claim 8 in which the treatment is catalyzed by the addition of a silanol condensation catalyst of the group consisting of ammonium compounds, amine compounds, and mixtures of two or more members of the group.
Claim 13
Dependent Claim
59 words
The method of claim 8 in which the ratio of component (i) to component (ii) is from 1:9 to 9:1, the total amount of component (i) and (ii) is from 1 to 80 weight parts per 100 weight parts of the finely divided silica, and the treated finely divided silica is further heated at 80° C. to 350° C.
Claim 14
Dependent Claim
59 words
The method of claim 9 in which the ratio of component (i) to component (ii) is from 1:9 to 9:1, the total amount of component (i) and (ii) is from 1 to 80 weight parts per 100 weight parts of the finely divided silica, and the treated finely divided silica is further heated at 80° C. to 350° C.
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