GB783868A - A process of preparing hydrophobic organo-silicon powders - Google Patents
A process of preparing hydrophobic organo-silicon powdersInfo
- Publication number
- GB783868A GB783868A GB28389/55A GB2838955A GB783868A GB 783868 A GB783868 A GB 783868A GB 28389/55 A GB28389/55 A GB 28389/55A GB 2838955 A GB2838955 A GB 2838955A GB 783868 A GB783868 A GB 783868A
- Authority
- GB
- United Kingdom
- Prior art keywords
- siloxane
- organogel
- silica
- per
- compound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
- A61K8/04—Dispersions; Emulsions
- A61K8/042—Gels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
- A61K8/89—Polysiloxanes
- A61K8/891—Polysiloxanes saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q19/00—Preparations for care of the skin
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/28—Compounds of silicon
- C09C1/30—Silicic acid
- C09C1/3081—Treatment with organo-silicon compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/90—Other properties not specified above
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Epidemiology (AREA)
- Birds (AREA)
- Organic Chemistry (AREA)
- Dermatology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Dispersion Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Silicon Polymers (AREA)
Abstract
Hydrophobic organosilicon powders, having bulk densities of less than 0.3 g. per c.c. and useful for thermal insulation, flatting agents in paints, cosmetic bases and reinforcing fillers for siloxane elastomers, are made by adding (1) an organosiloxane of the average general formula RnSiO 4-n/2 , in which each R is an aliphatic hydrocarbon radical containing less than 5 carbon atoms or a phenyl radical, there being not more than one phenyl radical attached to each Si atom and n has a value from 2 to 3 inclusive, to (2) a silica organogel, the organogel (2) having a density of from 0.02 to 0.35 g. of total SiO2 per c.c., the siloxane (1) being present in such an amount that there is at least 0.04 organosilyl units of compound (1) per SiO2 unit of compound (2), in the presence of a strong acid catalyst, and thereafter removing the volatile materials from the reaction product thus formed. The silica organogel (2) is preferably made by acidifying a sodium silicate solution, allowing the silica to gel and thereafter replacing the water with an organic solvent, e.g. an aliphatic or aromatic hydrocarbon, a chlorinated hydrocarbon, a ketone, an ether, a tertiary amine or a low viscosity siloxane. Organic solvents may be used for reacting siloxane (1) with the organogel (2). The siloxane may serve both as the solvent in the organogel and as reactant (1). Thus the compounds of the invention may be made by adding the siloxane directly to a hydrogel having the composition of compound (2), and the reaction therebetween may be effected at a temperature from 30 DEG C. to the reflux temperature of the solvent. Catalysts specified are chlorosilane, hydrochloric acid, sulphuric acid and benzene sulphonic acid. Examples 1 to 3 disclose the preparation of powders from silica hydrogels, siloxanes and solvents. Specifications 682,540, 682,574 and 783,867, [Group IV (a), are referred to.ALSO:Hydrophobic organosilicon powders, having bulk densities of less than 0.3 g. per cc. and useful for thermal insulation, flatting agents in paints, cosmetic bases and reinforcing fillers for siloxane elastomers, are made by adding (1) an organosiloxane of the average general formula RnSiO 4-n/2 in which each R is an aliphatic hydro carbon radical containing less than 5 carbon atoms or a phenyl radical, there being not more than one phenyl radical attached to each Si atom and n has a value from 2 to 3 inclusive; to (2) an organogel in which at least 50 mol. per cent of the polymer units are SiO2 units, any remaining units being of the general formula R1SiO1.5 in which R1 is an aliphatic hydro carbon radical containing less than 5 carbon atoms, the organogel (2) having a density of from 0.02 to 0.35 g. of total SiO2 and R1SiO1.5 per cc., the siloxane (1) being present in such an amount that there is at least 0.04 organosilyl units of compound (1) per polymer unit of compound (2), in the presence of a strong acid catalyst, and thereafter removing the volatile materials from the reaction product thus formed. The organogel (2) may be a silica organogel or a cogel of silica and a mono-organosiloxane, e.g. mono-methyl-, propyl-, vinyl-, allyl- or butyl-siloxane, the former preferably being made by acidifying a sodium silicate solution, allowing the silica to gel and thereafter replacing the water with an organic solvent, e.g. an aliphatic or aromatic hydrocarbon, a chlorinated hydrocarbon, a ketone, an ether, a tertiary amine or a low viscosity siloxane, and the latter best being made by acidifying a solution of a mixture of sodium silicate and a salt of the general formula R1Si(ONa)xO 3-x/2 , wherein x has a value from 1 to 2, the water in the co-gel being subsequently replaced by an organic solvent. Organic solvents may be used for reacting siloxane (1) with the organogel (2). The siloxane may serve both as the solvent in the organogel and as reactant (1). Thus the compounds of the invention may be made by adding the siloxane directly to a hydrogel having the composition of compound (2), and the reaction therebetween may be effected at a temperature from 30 DEG C. to the reflux temperature of the solvent. Catalysts specified are chlorosilane, hydrochloric acid, sulphuric acid and benzene sulphonic acid. Examples 1 to 3 disclose the preparation of powders from silica hydrogels, siloxanes and solvents, and Examples (4) to (8) disclose the preparation from cogels, siloxanes and solvents. 30 parts by weight of the powder of Example (1) were milled with 100 pts. of a dimethylpolysiloxane gum and 3 pts. of t-butyl perbenzoate, and the mixture was heated in a mould at 150 DEG C. to give an elastomer. Specifications 682,540, 682,574 and 783,867 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US783868XA | 1954-10-06 | 1954-10-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB783868A true GB783868A (en) | 1957-10-02 |
Family
ID=22143726
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB28389/55A Expired GB783868A (en) | 1954-10-06 | 1955-10-05 | A process of preparing hydrophobic organo-silicon powders |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB783868A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0378785A1 (en) * | 1988-11-25 | 1990-07-25 | Wacker-Chemie Gmbh | Process for hydrophobing solid particles containing Si-OH groups, and their use |
WO1998037016A1 (en) * | 1997-02-24 | 1998-08-27 | Dow Corning Corporation | Method for making hydrophobic silica gels under neutral conditions |
WO1998037015A1 (en) * | 1997-02-24 | 1998-08-27 | Dow Corning Corporation | Hydrophobic organosilicate-modified silica gels |
WO1998037017A1 (en) * | 1997-02-20 | 1998-08-27 | Dow Corning Corporation | Neutral-aged hydrophobic organosilicate-modified silica gels |
WO1998037020A1 (en) * | 1997-02-24 | 1998-08-27 | Dow Corning Corporation | Hydrophobic silica gels with reduced surface area |
WO1998037021A1 (en) * | 1997-02-24 | 1998-08-27 | Dow Corning Corporation | Method for making hydrophobic organosilicate-modified silica gels under neutral conditions |
WO1998037014A1 (en) * | 1997-02-24 | 1998-08-27 | Dow Corning Corporation | Neutral-aged hydrophobic silica gels with reduced surface area |
WO1998037013A1 (en) * | 1997-02-24 | 1998-08-27 | Dow Corning Corporation | Process for making hydrophobic silica with reduced surface area under neutral conditions |
WO1999036355A2 (en) * | 1998-01-15 | 1999-07-22 | Cabot Corporation | Method of preparing hydrophobic silica |
US6378229B1 (en) | 1997-12-19 | 2002-04-30 | Cabot Corporation | Method for the sub-critical drying of lyogels to produce aerogels |
US6481649B1 (en) | 1997-05-02 | 2002-11-19 | Cabot Corporation | Method for granulating aerogels |
US6620355B1 (en) | 1997-05-02 | 2003-09-16 | Cabot Corporation | Method for compacting aerogels |
US6825260B2 (en) | 1998-06-05 | 2004-11-30 | Cabot Corporation | Nanoporous interpenetrating organic-inorganic networks |
US7297718B2 (en) | 1998-01-14 | 2007-11-20 | Cabot Corporation | Method of producing substantially spherical lyogels in water insoluble silylating agents |
-
1955
- 1955-10-05 GB GB28389/55A patent/GB783868A/en not_active Expired
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5057151A (en) * | 1988-11-25 | 1991-10-15 | Wacker-Chemie Gmbh | Process for preparing hydrophobic particulate solids containing si-oh groups and a process for using the same |
EP0378785A1 (en) * | 1988-11-25 | 1990-07-25 | Wacker-Chemie Gmbh | Process for hydrophobing solid particles containing Si-OH groups, and their use |
WO1998037017A1 (en) * | 1997-02-20 | 1998-08-27 | Dow Corning Corporation | Neutral-aged hydrophobic organosilicate-modified silica gels |
WO1998037013A1 (en) * | 1997-02-24 | 1998-08-27 | Dow Corning Corporation | Process for making hydrophobic silica with reduced surface area under neutral conditions |
WO1998037015A1 (en) * | 1997-02-24 | 1998-08-27 | Dow Corning Corporation | Hydrophobic organosilicate-modified silica gels |
WO1998037020A1 (en) * | 1997-02-24 | 1998-08-27 | Dow Corning Corporation | Hydrophobic silica gels with reduced surface area |
WO1998037021A1 (en) * | 1997-02-24 | 1998-08-27 | Dow Corning Corporation | Method for making hydrophobic organosilicate-modified silica gels under neutral conditions |
WO1998037014A1 (en) * | 1997-02-24 | 1998-08-27 | Dow Corning Corporation | Neutral-aged hydrophobic silica gels with reduced surface area |
WO1998037016A1 (en) * | 1997-02-24 | 1998-08-27 | Dow Corning Corporation | Method for making hydrophobic silica gels under neutral conditions |
US6481649B1 (en) | 1997-05-02 | 2002-11-19 | Cabot Corporation | Method for granulating aerogels |
US6620355B1 (en) | 1997-05-02 | 2003-09-16 | Cabot Corporation | Method for compacting aerogels |
US6378229B1 (en) | 1997-12-19 | 2002-04-30 | Cabot Corporation | Method for the sub-critical drying of lyogels to produce aerogels |
US7297718B2 (en) | 1998-01-14 | 2007-11-20 | Cabot Corporation | Method of producing substantially spherical lyogels in water insoluble silylating agents |
WO1999036355A3 (en) * | 1998-01-15 | 1999-12-09 | Cabot Corp | Method of preparing hydrophobic silica |
US6344240B1 (en) | 1998-01-15 | 2002-02-05 | Cabot Corporation | Method of preparing hydrophobic silica |
WO1999036355A2 (en) * | 1998-01-15 | 1999-07-22 | Cabot Corporation | Method of preparing hydrophobic silica |
US6825260B2 (en) | 1998-06-05 | 2004-11-30 | Cabot Corporation | Nanoporous interpenetrating organic-inorganic networks |
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