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EP0251176A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method for modifying the surface of finely divided silica

Assignee: DuPont Toray Specialty Materials KK
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Filing: 1987-06-24
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Granted: —
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Expires: 2007-06-24
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Abstract

Abstract In the present invention, finely divided silica is treated with two types of organosilicon compounds, (i) organosilicon compound having the general formula 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 EP
Data Source google_patents
Last Synchronized 2026-10-30 04:40
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: 7
Claim 1
Independent Claim 131 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 m²/g is treated with both (i) organosilicon compound having the general formula 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.
Claim 2
Independent Claim 131 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 m²/g is treated with both (i) organosilicon compound having the general formula 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.
Claim 3
Dependent Claim 22 words
The method of claim 1 in which the finely divided silica has a water content of from 0.2 to 7 weight percent.
Claim 4
Dependent Claim 20 words
The method of claim 2 in which the ratio of component (I) to component (ii) is from 1:9 to 9:1.
Claim 5
Dependent Claim 31 words
The method of claim 3 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 6
Dependent Claim 19 words
The method of claim 1 in which the treated finely divided silica is further heated at 80°C to 350°C.
Claim 7
Dependent Claim 19 words
The method of claim 4 in which the treated finely divided silica is further heated at 80°C to 350°C.

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