US5760109A
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Water-base organopolysiloxane composition
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1996-08-08
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Granted: 1998-06-02
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Expires: 2016-08-08
Abstract
Abstract Proposed is a novel organopolysiloxane composition in the form of a water-base emulsion suitable for use as a surface-coating agent on rubber articles such as automobile parts to impart excellent smoothness of the surface, abrasion resistance, adhesion to the rubber surface and so on. The composition comprises: (a) an organopolysiloxane having a viscosity of at least 10000 centipoise at 25 DEG C. and having a molecular structure consisting of the difunctional siloxane units and the trifunctional siloxane units terminated at each molecular chain end with a hydroxy group, in the form of an aqueous emulsion; (b) a hydrolysis-condensation product of an epoxy group-containing dialkoxy silane in the form of an aqueous emulsion; (c) a water-soluble organic amino compound having at least two amino groups in a molecule and containing no silicon atom; and (d) silicone rubber particles in the form of an aqueous dispersion, each in a specified weight proportion.
Inventors
- 👤 Yoshinori Inokuchi
- 👤 Satoshi Kuwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:19
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08K; C08K5/00; C08K5/16; C08K5/17; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/70; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
367 words
An organopolysiloxane composition in the form of a water-base emulsion suitable as a coating agent for the surface of a rubber article, which comprises: (a) an organopolysiloxane having a viscosity of at least 10000 centipoise at 25° C. and having a molecular structure consisting of the difunctional siloxane units represented by the general unit formula R 1 2 SiO 2/2 and the trifunctional siloxane units represented by the general unit formula R 2 3 SiO 3/2 , in which R 1 and R 2 are each an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms, in a molar proportion of the trifunctional units to the difunctional units not exceeding 0.01, and terminated at each molecular chain end with a hydroxy group, which is in the form of an aqueous emulsion; (b) a hydrolysis-condensation product of an epoxy group-containing dialkoxy silane compound represented by the general formula R 3 SiR 4 (OR 5 ) 2 , in which R 3 is an epoxy group-containing monovalent organic group having 5 to 20 carbon atoms and R 4 and R 5 are each a monovalent hydrocarbon group having 1 to 6 carbon atoms and free from an epoxy group, a cohydrolysis-cocondensation product of the above defined epoxy group-containing dialkoxy silane compound and another dialkoxy silane compound free from an epoxy group represented by the general formula R 6 R 7 Si(OR 8 ) 2 , in which R 6 , R 7 and R 8 are each a monovalent hydrocarbon group having 1 to 6 carbon atoms free from an epoxy group, or a combination thereof, which is in the form of an aqueous emulsion; (c) a water-soluble organic amino compound having at least two amino groups in a molecule and containing no silicon atoms; and (d) silicone rubber particles in the form of an aqueous dispersion, in such a weight proportion that the amounts of the components (a), (b), (c) and (d) are in the ranges from 10 to 90% by weight, from 1 to 50% by weight, from 0.1 to 40% by weight and from 1 to 70% by weight, respectively, based on the total amount of the components (a), (b), (c) and (d).
Claim 2
Dependent Claim
367 words
An organopolysiloxane composition in the form of a water-base emulsion suitable as a coating agent for the surface of a rubber article, which comprises: (a) an organopolysiloxane having a viscosity of at least 10000 centipoise at 25° C. and having a molecular structure consisting of the difunctional siloxane units represented by the general unit formula R 1 2 SiO 2/2 and the trifunctional siloxane units represented by the general unit formula R 2 3 SiO 3/2 , in which R 1 and R 2 are each an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms, in a molar proportion of the trifunctional units to the difunctional units not exceeding 0.01, and terminated at each molecular chain end with a hydroxy group, which is in the form of an aqueous emulsion; (b) a hydrolysis-condensation product of an epoxy group-containing dialkoxy silane compound represented by the general formula R 3 SiR 4 (OR 5 ) 2 , in which R 3 is an epoxy group-containing monovalent organic group having 5 to 20 carbon atoms and R 4 and R 5 are each a monovalent hydrocarbon group having 1 to 6 carbon atoms and free from an epoxy group, a cohydrolysis-cocondensation product of the above defined epoxy group-containing dialkoxy silane compound and another dialkoxy silane compound free from an epoxy group represented by the general formula R 6 R 7 Si(OR 8 ) 2 , in which R 6 , R 7 and R 8 are each a monovalent hydrocarbon group having 1 to 6 carbon atoms free from an epoxy group, or a combination thereof, which is in the form of an aqueous emulsion; (c) a water-soluble organic amino compound having at least two amino groups in a molecule and containing no silicon atoms; and (d) silicone rubber particles in the form of an aqueous dispersion, in such a weight proportion that the amounts of the components (a), (b), (c) and (d) are in the ranges from 10 to 90% by weight, from 1 to 50% by weight, from 0.1 to 40% by weight and from 1 to 70% by weight, respectively, based on the total amount of the components (a), (b), (c) and (d).
Claim 3
Dependent Claim
30 words
The organopolysiloxane composition in the form of a water-base emulsion as claimed in claim 1 in which at least 90% of the groups denoted by R 1 are methyl groups.
Claim 4
Dependent Claim
29 words
The organopolysiloxane composition in the form of a water-base emulsion as claimed in claim 1 in which the group denoted by R 2 is a methyl or phenyl group.
Claim 5
Dependent Claim
34 words
The organopolysiloxane composition in the form of a water-base emulsion as claimed in claim 1 in which the organopolysiloxane as the component (a) has a viscosity of at least 100000 centipoise at 25° C.
Claim 6
Dependent Claim
36 words
The organopolysiloxane composition in the form of a water-base emulsion as claimed in claim 1 in which the group denoted by R 3 is selected from the group consisting of 2-glycidyloxyethyl, 3-glycidyloxypropyl, 2-(3,4-epoxycyclohexyl)ethyl and 3-(3,4-epoxycyclohexyl)propyl groups.
Claim 7
Dependent Claim
55 words
The organopolysiloxane composition in the form of a water-base emulsion as claimed in claim 1 in which the epoxy group-containing dialkoxy silane compound is selected from the group consisting of 2-glycidyloxyethyl methyl dimethoxy silane, 2-glycidyloxyethyl methyl diethoxy silane, 3-glycidyloxypropyl methyl dimethoxy silane, 3-glycidyloxypropyl methyl diethoxy silane, 2-(3,4-epoxycyclohexyl)ethyl methyl dimethoxy silane and 2-(3,4-epoxycyclohexyl)ethyl methyl diethoxy silane.
Claim 8
Dependent Claim
45 words
The organopolysiloxane composition in the form of a water-base emulsion as claimed in claim 1 in which the water-soluble organic amino compound as the component (c) is selected from the group consisting of ethylenediamine, hexanediamine, diethylenetriamine, triethylenetetramine, 1,8-diamino-4-menthane, N-aminoethyl piperazine, hexamethylenetetramine, 1,3-phenylenediamine and norbornane diamine.
Claim 9
Dependent Claim
38 words
The organopolysiloxane composition in the form of a water-base emulsion as claimed in claim 1 in which the silicone rubber particles as the component (d) have an average particle diameter in the range from 0.1 to 100 μm.
Claim 10
Dependent Claim
72 words
The organopolysiloxane composition in the form of a water-base emulsion as claimed in claim 1 in which the amounts of the component (a), component (b), component (c) and component (d) are in the ranges of from 20 to 70% by weight, from 2 to 30% by weight, from 0.5 to 20% by weight and from 10 to 60% by weight, respectively, based on the total amount of the components (a) to (d).
Claim 11
Dependent Claim
39 words
The organopolysiloxane composition of claim 1, wherein, in organopolysiloxane (a), R 1 and R 2 are each independently an alkyl, alkenyl, phenyl, tolyl or cycloalkyl group of 1-20 carbon atoms optionally substituted by halogen, epoxy, carboxy or amino groups.
Claim 12
Dependent Claim
25 words
The organopolysiloxane composition of claim 1, wherein, in organopolysiloxane (a), the molar proportion of the trifunctional units to the difunctional units does not exceed 0.005.
Claim 13
Dependent Claim
19 words
The organopolysiloxane composition of claim 1, wherein the hydrolysis-condensation product or cohydrolysis-cocondensation product has been reacted with trimethylsilyl groups.
Claim 14
Dependent Claim
33 words
The organopolysiloxane composition of claim 1, wherein (b) is a cohydrolysis-cocondensation product and the amount of the epoxy group-containing dialkoxy silane compound used to prepare the product is at least 50% by moles.
Claim 15
Dependent Claim
21 words
The organopolysiloxane composition of claim 1, wherein the average particle diameter of the silicone rubber particles, (d), is from 1-20 μm.
Claim 16
Dependent Claim
21 words
A coated rubber article comprising a rubber article having a coating thereon comprising a cured organopolysiloxane composition according to claim 1.
Claim 17
Dependent Claim
20 words
The coated rubber article of claim 15, wherein the coating is provided in a thickness of 0.1 to 10 μm.
References Cited (Backward Citations)
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