US5286766A
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Room temperature vulcanizable organopolysiloxane composition and method for producing the same
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1992-06-03
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Granted: 1994-02-15
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Expires: 2012-06-03
Abstract
Abstract A room temperature vulcanizable organopolysiloxane composition comprises (A) a diorganopolysiloxane which is blocked with an alkoxy group at both ends of a molecular chain thereof, (B) a tri or tetraalkoxysilane, (C) a titanium curing catalyst, (D) a silica filler, and (E) an alkoxysilane which is less hydrolyzable than the alkoxysilane of (B). The composition yields a cured product having high strength and high elongation and is low in viscosity and extrusion rate. A method for preparing the composition is also provided in which the ingredients (A) to (D) are first mixed together, to which the ingredient (E) is added.
Inventors
- 👤 Masatoshi Arai
- 👤 Tsuneo Kimura
- 👤 Kazuyuki Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:33
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C08K5/00; C08K5/54; C08K5/541; C08K5/5415; C08K5/5419; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/18
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
230 words
A room temperature vulcanizable organopolysiloxane composition which comprises: (A) 100 parts by weight of at least one diorganopolysiloxane which is blocked with at least one alkoxy group at both ends of a molecular chain thereof; (B) from 1 to 25 parts by weight of a first alkoxysilane of the general formula, or a partial hydrolyzate thereof, R.sup.1.sub.4-n Si(OR.sup.2).sub.n wherein R 1 and R 2 may be the same or different and represent an unsubstituted or substituted monovalent hydrocarbon group, and n is 3 or 4, said first alkoxysilane having a first hydrolyzing property; (C) from 0.01 to 10 parts by weight of a curing catalyst selected from the group consisting of titanic esters and titanium complex compounds; (D) from 5 to 500 parts by weight of a silica filler; and (E) from 1 to 25 parts by weight of a second alkoxysilane of the following general formula, or a partial hydrolyzate thereof, R.sup.1.sub.4-m Si(OR.sup.2).sub.m wherein R 1 and R 2 have, respectively, the same meanings as defined with respect to (B) and m is an integer of from 1 to 4, said second alkoxysilane having a second hydrolyzing property, the first and second hydrolyzing properties being such that the second alkoxysilane is less hydrolyzable than the first alkoxysilane, said room temperature vulcanizable organopolysiloxane composition being prepared by first mixing components (A)-(D) and then adding component (E) to the resulting mixture.
Claim 2
Dependent Claim
230 words
A room temperature vulcanizable organopolysiloxane composition which comprises: (A) 100 parts by weight of at least one diorganopolysiloxane which is blocked with at least one alkoxy group at both ends of a molecular chain thereof; (B) from 1 to 25 parts by weight of a first alkoxysilane of the general formula, or a partial hydrolyzate thereof, R.sup.1.sub.4-n Si(OR.sup.2).sub.n wherein R 1 and R 2 may be the same or different and represent an unsubstituted or substituted monovalent hydrocarbon group, and n is 3 or 4, said first alkoxysilane having a first hydrolyzing property; (C) from 0.01 to 10 parts by weight of a curing catalyst selected from the group consisting of titanic esters and titanium complex compounds; (D) from 5 to 500 parts by weight of a silica filler; and (E) from 1 to 25 parts by weight of a second alkoxysilane of the following general formula, or a partial hydrolyzate thereof, R.sup.1.sub.4-m Si(OR.sup.2).sub.m wherein R 1 and R 2 have, respectively, the same meanings as defined with respect to (B) and m is an integer of from 1 to 4, said second alkoxysilane having a second hydrolyzing property, the first and second hydrolyzing properties being such that the second alkoxysilane is less hydrolyzable than the first alkoxysilane, said room temperature vulcanizable organopolysiloxane composition being prepared by first mixing components (A)-(D) and then adding component (E) to the resulting mixture.
Claim 3
Dependent Claim
93 words
The room temperature vulcanizable organopolysiloxane composition according to claim 1, wherein said diorganopolysiloxane is of the following general formula ##STR2## wherein each R 3 , each R 4 and each R 5 may be the same or different and represent an unsubstituted or substituted monovalent hydrocarbon group having from 1 to 12 carbon atoms, each R represents an unsubstituted or substituted monovalent monohydrocarbon group as defined with respect to R 3 to R 5 , p is a value of 0 to 2, and q is an integer of not smaller than 10.
Claim 4
Dependent Claim
24 words
The room temperature vulcanizable organopolysiloxane composition according to claim 2, wherein each R represents a lower alkyl group having 1 to 2 carbon atom.
Claim 5
Dependent Claim
25 words
The room temperature vulcanizable organopolysiloxane composition according to claim 1, wherein said diorganopolysiloxane has a viscosity at 25° C. of from 25 to 500,000 centistokes.
Claim 6
Dependent Claim
18 words
The room temperature vulcanizable organopolysiloxane composition according to claim 1, comprising a mixture of diorganopolysiloxanes having different viscosities.
Claim 7
Dependent Claim
17 words
The room temperature vulcanizable organopolysiloxane composition according to claim 1, wherein the ingredient (B) is the alkoxysilane.
Claim 8
Dependent Claim
21 words
The room temperature vulcanizable organopolysiloxane composition according to claim 1, wherein the ingredient (B) is a partial hydrolyzate of the alkoxysilane.
Claim 9
Dependent Claim
18 words
The room temperature vulcanizable organopolysiloxane composition according to claim 1, wherein the ingredient (C) is a titanic ester.
Claim 10
Dependent Claim
19 words
The room temperature vulcanizable organopolysiloxane composition according to claim 1, wherein the ingredient (C) is a titanium complex compound.
Claim 11
Dependent Claim
26 words
The room temperature vulcanizable organopolysiloxane composition according to claim 1, wherein said silica filler is surface treated with a member selected from organochlorosilanes, polyorganosilanes and organosilazanes.
Claim 12
Dependent Claim
37 words
The room temperature vulcanizable organopolysiloxane composition according to claim 1, wherein said alkoxysilane of the ingredient (E) is present in an amount larger than said alkoxysilane of the ingredient (B) within the defined range of the amount.
Claim 13
Dependent Claim
9 words
A cured product of the composition in claim 1.
Claim 14
Independent Claim
247 words
A method for preparing a room temperature vulcanizable organopolysiloxane composition which comprises: mixing, in a dry atmosphere which is substantially free of moisture, (A) 100 parts by weight of at least one diorganopolysiloxane which is blocked with at least one alkoxy group at both ends of a molecular chain thereof, (B) from 1 to 25 parts by weight of a first alkoxysilane of the general formula, or a partial hydrolyzate thereof, R.sup.1.sub.4-n Si(OR.sup.2).sub.n wherein R 1 and R 2 may be the same or different and represent an unsubstituted or substituted monovalent hydrocarbon group, and n is 3 or 4, said first alkoxysilane having a first hydrolyzing property, (C) from 0.01 to 10 parts by weight of a curing catalyst selected from the group consisting of titanic esters and titanium complex compounds; and (D) from 5 to 500 parts by weight of a silica filler until a uniform mixture is obtained; and adding from 1 to 25 parts by weight of a second alkoxysilane of the following general formula, or a partial hydrolyzate thereof, R.sup.1.sub.4-m Si(OR.sup.2).sub.m wherein R 1 and R 2 have, respectively, the same meanings as defined with respect to (B) and m is an integer of from 1 to 4, to the resultant mixture for uniform mixing in a dry atmosphere which is substantially free of moisture, said second alkoxysilane having a second hydrolyzing property, the first and second hydrolyzing properties being such that the second alkoxysilane is less hydrolyzable than the first alkoxysilane.
Claim 15
Independent Claim
247 words
A method for preparing a room temperature vulcanizable organopolysiloxane composition which comprises: mixing, in a dry atmosphere which is substantially free of moisture, (A) 100 parts by weight of at least one diorganopolysiloxane which is blocked with at least one alkoxy group at both ends of a molecular chain thereof, (B) from 1 to 25 parts by weight of a first alkoxysilane of the general formula, or a partial hydrolyzate thereof, R.sup.1.sub.4-n Si(OR.sup.2).sub.n wherein R 1 and R 2 may be the same or different and represent an unsubstituted or substituted monovalent hydrocarbon group, and n is 3 or 4, said first alkoxysilane having a first hydrolyzing property, (C) from 0.01 to 10 parts by weight of a curing catalyst selected from the group consisting of titanic esters and titanium complex compounds; and (D) from 5 to 500 parts by weight of a silica filler until a uniform mixture is obtained; and adding from 1 to 25 parts by weight of a second alkoxysilane of the following general formula, or a partial hydrolyzate thereof, R.sup.1.sub.4-m Si(OR.sup.2).sub.m wherein R 1 and R 2 have, respectively, the same meanings as defined with respect to (B) and m is an integer of from 1 to 4, to the resultant mixture for uniform mixing in a dry atmosphere which is substantially free of moisture, said second alkoxysilane having a second hydrolyzing property, the first and second hydrolyzing properties being such that the second alkoxysilane is less hydrolyzable than the first alkoxysilane.
Claim 16
Dependent Claim
22 words
The method according to claim 13, wherein the mixing of the ingredients (A) to (D) is continued for 10 to 30 minutes.
References Cited (Backward Citations)
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