US5977226A
Expired / Lapsed
US
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Vacuum dispensable silicone compositions
Assignee: Dow Silicones Corp
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Filing: 1998-05-04
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Granted: 1999-11-02
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Expires: 2018-05-04
Abstract
Abstract A vacuum dispensable silicone composition comprising (A) a polydiorganosiloxane containing an average of at least two silicon-bonded alkenyl groups per molecule; (B) an organopolysiloxane resin consisting essentially of (a) R 3 2 (CH 2 ═CH)SiO 1/2 siloxane units, (b) R 3 3 SiO 1/2 siloxane units, and (c) SiO 4/2 siloxane units wherein each R 3 is independently selected from the group consisting of monovalent hydrocarbon and monovalent halogenated hydrocarbon groups free of aliphatic unsaturation, the mole ratio of the combination of (a) and (b) units to (c) units is from 0.6 to 1.1, and the resin contains 1 to 5 percent by weight of vinyl groups; (C) an organohydrogenpolysiloxane having an average of at least three silicon-bonded hydrogen atoms per molecule in an amount sufficient to provide from one to three silicon-bonded hydrogen atoms per alkenyl group in components (A) and (B) combined; (D) an adhesion promoter in an amount sufficient to effect adhesion of the composition to a substrate; (E) a hydrosilylation catalyst; (F) a platinum catalyst inhibitor having a boiling point greater than 150 ° C. at 0.10 MPa in an amount sufficient to retard curing of the composition at ambient temperature; wherein the composition is substantially free of air.
Inventors
- 👤 Stanton James Dent
- 👤 Edward Joseph Benson
- 👤 Ann Walstrom Norris
- 👤 Yeong Joo Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:00
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/10; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/32; C08K; C08K3/00; C08G77/12; C08G77/20
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
249 words
A silicone composition comprising: (A) 100 parts by weight of a polydiorganosiloxane containing an average of at least two silicon-bonded alkenyl groups per molecule; (B) 10 to 100 parts by weight of an organopolysiloxane resin consisting essentially of (a) R 3 2 (CH 2 ═CH)SiO 1/2 siloxane units, (b) R 3 3 SiO 1/2 siloxane units, and (c) SiO 4/2 siloxane units wherein each R 3 is independently selected from the group consisting of monovalent hydrocarbon and monovalent halogenated hydrocarbon groups free of aliphatic unsaturation, the mole ratio of the combination of (a) and (b) units to (c) units is from 0.6:1 to 1.1:1, and the resin contains from 1 to 5 percent by weight of vinyl groups; (C) an organohydrogenpolysiloxane having an average of at least three silicon-bonded hydrogen atoms per molecule in an amount sufficient to provide from one to three silicon-bonded hydrogen atoms per alkenyl group in components (A) and (B) combined; (D) an adhesion promoter in an amount sufficient to effect adhesion of the composition to a substrate; (E) a hydrosilylation catalyst in an amount sufficient to provide from 0.1 to 1000 parts per million of a platinum group metal based on the combined weight of components (A), (B) and (C); and (F) a platinum catalyst inhibitor having a boiling point greater than 150° C. at 0.10 MPa in an amount sufficient to retard curing of the composition at ambient temperature; and wherein the composition comprising components (A) through (F) is substantially free of air.
Claim 2
Dependent Claim
249 words
A silicone composition comprising: (A) 100 parts by weight of a polydiorganosiloxane containing an average of at least two silicon-bonded alkenyl groups per molecule; (B) 10 to 100 parts by weight of an organopolysiloxane resin consisting essentially of (a) R 3 2 (CH 2 ═CH)SiO 1/2 siloxane units, (b) R 3 3 SiO 1/2 siloxane units, and (c) SiO 4/2 siloxane units wherein each R 3 is independently selected from the group consisting of monovalent hydrocarbon and monovalent halogenated hydrocarbon groups free of aliphatic unsaturation, the mole ratio of the combination of (a) and (b) units to (c) units is from 0.6:1 to 1.1:1, and the resin contains from 1 to 5 percent by weight of vinyl groups; (C) an organohydrogenpolysiloxane having an average of at least three silicon-bonded hydrogen atoms per molecule in an amount sufficient to provide from one to three silicon-bonded hydrogen atoms per alkenyl group in components (A) and (B) combined; (D) an adhesion promoter in an amount sufficient to effect adhesion of the composition to a substrate; (E) a hydrosilylation catalyst in an amount sufficient to provide from 0.1 to 1000 parts per million of a platinum group metal based on the combined weight of components (A), (B) and (C); and (F) a platinum catalyst inhibitor having a boiling point greater than 150° C. at 0.10 MPa in an amount sufficient to retard curing of the composition at ambient temperature; and wherein the composition comprising components (A) through (F) is substantially free of air.
Claim 3
Dependent Claim
21 words
The composition according to claim 1, wherein the polydiorganosiloxane has a viscosity of from 1 to 100 Pa·s at 25° C.
Claim 4
Dependent Claim
41 words
The composition according to claim 1, wherein component (A) comprises a first polydiorganosiloxane having a viscosity of from 45 to 65 Pa·s at 25° C. and a second polydiorganosiloxane having a viscosity of from 1.8 to 2.4 Pa·s at 25° C.
Claim 5
Dependent Claim
14 words
The composition according to claim 1, wherein component (A) is free of aryl groups.
Claim 6
Dependent Claim
83 words
The composition according to claim 1, wherein the adhesion promoter is an organosilicon compound having the average formula: ##STR7## wherein R 5 is a monovalent hydrocarbon group free of aliphatic unsaturation, R 6 is alkenyl, x has a value of from 0 to 10, y has a value of from 0 to 10, z has a value of from 0 to 10, the sum y+z is at least 1, and Q has the formula: ##STR8## wherein R 7 is a divalent organic group.
Claim 7
Dependent Claim
37 words
The composition according to claim 5, wherein R 5 is methyl, R 6 is vinyl, x is 2, y is 2, z is 0, and R 7 is --CH 2 OCH 2 CH 2 CH 2 --.
Claim 8
Dependent Claim
25 words
The composition according to claim 1, further comprising an inorganic filler selected from the group consisting of alumina, boron nitride, aluminum nitride, and fused silica.
Claim 9
Dependent Claim
13 words
The composition according to claim 7, wherein the inorganic filler is fused silica.
Claim 10
Dependent Claim
15 words
The composition according to claim 1, wherein the platinum catalyst inhibitor is an acetylenic alcohol.
Claim 11
Dependent Claim
12 words
The composition according to claim 9, wherein the acetylenic alcohol is 2-phenyl-3-butyn-2-ol.
Claim 12
Dependent Claim
134 words
The composition according to claim 5, wherein component (A) is a polydiorganosiloxane having the general formula R 2 R 1 2 SiO(R 1 2 SiO) n SiR 1 2 R 2 wherein each R 1 is independently selected from the group consisting of monovalent hydrocarbon and monovalent halogenated hydrocarbon groups free of aliphatic unsaturation, R 2 is alkenyl, and n has a value such that the viscosity of component (A) is from 1 to 100 Pa·s at 25° C.; (B) is an organopolysiloxane resin consisting essentially of (CH 3 ) 2 CH 2 ═CHSiO 1/2 siloxane units, (CH 3 ) 3 SiO 1/2 siloxane units, and SiO 4/2 siloxane units; (C) is a trimethylsiloxy-terminated dimethylmethylhydrogensiloxane having an average degree of polymerization of 10; (E) is a platinum catalyst; and (F) is an acetylenic alcohol.
Claim 13
Dependent Claim
25 words
The composition according to claim 11, further comprising an inorganic filler selected from the group consisting of alumina, boron nitride, aluminum nitride, and fused silica.
Claim 14
Dependent Claim
15 words
The composition according to claim 1, wherein the composition is contained in a sealed package.
Claim 15
Dependent Claim
13 words
A cured composition, comprising a reaction product of the composition of claim 1.
Claim 16
Dependent Claim
13 words
A cured composition, comprising a reaction product of the composition of claim 2.
Claim 17
Dependent Claim
13 words
A cured composition, comprising a reaction product of the composition of claim 3.
Claim 18
Dependent Claim
13 words
A cured composition, comprising a reaction product of the composition of claim 5.
Claim 19
Dependent Claim
13 words
A cured composition, comprising a reaction product of the composition of claim 7.
Claim 20
Dependent Claim
13 words
A cured composition, comprising a reaction product of the composition of claim 9.
Claim 21
Dependent Claim
272 words
A multi-part silicone composition, comprising: (A) 100 parts by weight of a polydiorganosiloxane containing an average of at least two silicon-bonded alkenyl groups per molecule; (B) 10 to 100 parts by weight of an organopolysiloxane resin consisting essentially of (a) R 3 2 (CH 2 ═CH)SiO 1/2 siloxane units, (b) R 3 3 SiO 1/2 siloxane units, and (c) SiO 4/2 siloxane units wherein each R 3 is independently selected from the group consisting of monovalent hydrocarbon and monovalent halogenated hydrocarbon groups free of aliphatic unsaturation, the mole ratio of the combination of (a) and (b) units to (c) units is from 0.6:1 to 1.1:1, and the resin contains from 1 to 5 percent by weight of vinyl groups; (C) an organohydrogenpolysiloxane having an average of at least three silicon-bonded hydrogen atoms per molecule in an amount sufficient to provide from one to three silicon-bonded hydrogen atoms per alkenyl group in components (A) and (B) combined; (D) an adhesion promoter in an amount sufficient to effect adhesion of the composition to a substrate; (E) a hydrosilylation catalyst in an amount sufficient to provide from 0.1 to 1000 parts per million of a platinum group metal based on the combined weight of components (A), (B) and (C); and (F) a platinum catalyst inhibitor having a boiling point greater than 150° C. at 0.10 MPa in an amount sufficient to retard curing of the composition at ambient temperature; wherein each part of the composition is substantially free of air, and with the proviso that neither the polydiorganosiloxane nor the organopolysiloxane resin are present with the organohydrogenpolysiloxane and the hydrosilylation catalyst in the same part.
Claim 22
Dependent Claim
272 words
A multi-part silicone composition, comprising: (A) 100 parts by weight of a polydiorganosiloxane containing an average of at least two silicon-bonded alkenyl groups per molecule; (B) 10 to 100 parts by weight of an organopolysiloxane resin consisting essentially of (a) R 3 2 (CH 2 ═CH)SiO 1/2 siloxane units, (b) R 3 3 SiO 1/2 siloxane units, and (c) SiO 4/2 siloxane units wherein each R 3 is independently selected from the group consisting of monovalent hydrocarbon and monovalent halogenated hydrocarbon groups free of aliphatic unsaturation, the mole ratio of the combination of (a) and (b) units to (c) units is from 0.6:1 to 1.1:1, and the resin contains from 1 to 5 percent by weight of vinyl groups; (C) an organohydrogenpolysiloxane having an average of at least three silicon-bonded hydrogen atoms per molecule in an amount sufficient to provide from one to three silicon-bonded hydrogen atoms per alkenyl group in components (A) and (B) combined; (D) an adhesion promoter in an amount sufficient to effect adhesion of the composition to a substrate; (E) a hydrosilylation catalyst in an amount sufficient to provide from 0.1 to 1000 parts per million of a platinum group metal based on the combined weight of components (A), (B) and (C); and (F) a platinum catalyst inhibitor having a boiling point greater than 150° C. at 0.10 MPa in an amount sufficient to retard curing of the composition at ambient temperature; wherein each part of the composition is substantially free of air, and with the proviso that neither the polydiorganosiloxane nor the organopolysiloxane resin are present with the organohydrogenpolysiloxane and the hydrosilylation catalyst in the same part.
Claim 23
Dependent Claim
208 words
The composition according to claim 20, wherein component (A) is a polydiorganosiloxane having the general formula R 2 R 1 2 SiO(R 1 2 SiO) n SiR 1 2 R 2 wherein each R 1 is independently selected from the group consisting of monovalent hydrocarbon and monovalent halogenated hydrocarbon groups free of aliphatic unsaturation, R 2 is alkenyl, and n has a value such that the viscosity of component (A) is from 1 to 100 Pa·s at 25° C.; (B) is an organopolysiloxane resin consisting essentially of (CH 3 ) 2 CH 2 ═CHSiO 1/2 siloxane units, (CH 3 ) 3 SiO 1/2 siloxane units, and SiO 4/2 siloxane units; (C) is a trimethylsiloxy-terminated dimethylmethylhydrogensiloxane having an average degree of polymerization of 10; (D) is an organosilicon compound having the average formula: ##STR9## wherein R 5 is a monovalent hydrocarbon group free of aliphatic unsaturation, R 6 is alkenyl, x has a value of from 0 to 10, y has a value of from 0 to 10, z has a value of from 0 to 10, the sum y+z is at least 1, and Q has the formula ##STR10## wherein R 7 is a divalent organic group; (E) is a platinum catalyst; and (F) is an acetylenic alcohol.
Claim 24
Dependent Claim
25 words
The composition according to claim 20, further comprising an inorganic filler selected from the group consisting of alumina, boron nitride, aluminum nitride, and fused silica.
Claim 25
Independent Claim
257 words
A method of preparing a silicone composition, comprising the steps of: (I) mixing (A) 100 parts by weight of a polydiorganosiloxane containing an average of at least two silicon-bonded alkenyl groups per molecule; (B) 10 to 100 parts by weight of an organopolysiloxane resin consisting essentially of (a) R 3 2 (CH 2 ═CH)SiO 1/2 siloxane units, (b) R 3 3 SiO 1/2 siloxane units, and (c) SiO 4/2 siloxane units wherein each R 3 is independently selected from the group consisting of monovalent hydrocarbon and monovalent halogenated hydrocarbon groups free of aliphatic unsaturation, the mole ratio of the combination of (a) and (b) units to (c) units is from 0.6:1 to 1.1:1, and the resin contains from 1 to 5 percent by weight of vinyl groups; (C) an organohydrogenpolysiloxane having an average of at least three silicon-bonded hydrogen atoms per molecule in an amount sufficient to provide from one to three silicon-bonded hydrogen atoms per alkenyl group in components (A) and (B) combined; (D) an adhesion promoter in an amount sufficient to effect adhesion of the composition to a substrate; (E) a hydrosilylation catalyst in an amount sufficient to provide from 0.1 to 1000 parts per million of a platinum group metal based on the combined weight of components (A), (B) and (C); and (F) a platinum catalyst inhibitor having a boiling point greater than 150° C. at 0.10 MPa in an amount sufficient to retard curing of the composition at ambient temperature; and (II) de-airing the mixture to produce a composition substantially free of air.
Claim 26
Independent Claim
257 words
A method of preparing a silicone composition, comprising the steps of: (I) mixing (A) 100 parts by weight of a polydiorganosiloxane containing an average of at least two silicon-bonded alkenyl groups per molecule; (B) 10 to 100 parts by weight of an organopolysiloxane resin consisting essentially of (a) R 3 2 (CH 2 ═CH)SiO 1/2 siloxane units, (b) R 3 3 SiO 1/2 siloxane units, and (c) SiO 4/2 siloxane units wherein each R 3 is independently selected from the group consisting of monovalent hydrocarbon and monovalent halogenated hydrocarbon groups free of aliphatic unsaturation, the mole ratio of the combination of (a) and (b) units to (c) units is from 0.6:1 to 1.1:1, and the resin contains from 1 to 5 percent by weight of vinyl groups; (C) an organohydrogenpolysiloxane having an average of at least three silicon-bonded hydrogen atoms per molecule in an amount sufficient to provide from one to three silicon-bonded hydrogen atoms per alkenyl group in components (A) and (B) combined; (D) an adhesion promoter in an amount sufficient to effect adhesion of the composition to a substrate; (E) a hydrosilylation catalyst in an amount sufficient to provide from 0.1 to 1000 parts per million of a platinum group metal based on the combined weight of components (A), (B) and (C); and (F) a platinum catalyst inhibitor having a boiling point greater than 150° C. at 0.10 MPa in an amount sufficient to retard curing of the composition at ambient temperature; and (II) de-airing the mixture to produce a composition substantially free of air.
Claim 27
Dependent Claim
208 words
The method according to claim 23, wherein component (A) is a polydiorganosiloxane having the general formula R 2 R 1 2 SiO(R 1 2 SiO) n SiR 1 2 R 2 wherein each R 1 is independently selected from the group consisting of monovalent hydrocarbon and monovalent halogenated hydrocarbon groups free of aliphatic unsaturation, R 2 is alkenyl, and n has a value such that the viscosity of component (A) is from 1 to 100 Pa·s at 25° C.; (B) is an organopolysiloxane resin consisting essentially of (CH 3 ) 2 CH 2 ═CHSiO 1/2 siloxane units, (CH 3 ) 3 SiO 1/2 siloxane units, and SiO 4/2 siloxane units; (C) is a trimethylsiloxy-terminated dimethylmethylhydrogensiloxane having an average degree of polymerization of 10; (D) is an organosilicon compound having the average formula: ##STR11## wherein R 5 is a monovalent hydrocarbon group free of aliphatic unsaturation, R 6 is alkenyl, x has a value of from 0 to 10, y has a value of from 0 to 10, z has a value of from 0 to 10, the sum y+z is at least 1, and Q has the formula ##STR12## wherein R 7 is a divalent organic group; (E) is a platinum catalyst; and (F) is an acetylenic alcohol.
Claim 28
Dependent Claim
32 words
The method according to claim 23, wherein the mixture formed prior to de-airing further comprises an inorganic filler selected from the group consisting of alumina, boron nitride, aluminum nitride, and fused silica.
Claim 29
Dependent Claim
23 words
The method according to claim 23, wherein the step of de-airing comprises passing the mixture through a falling film evaporator under a vacuum.
Claim 30
Dependent Claim
32 words
The method according to claim 26, wherein the step of de-airing is carried out at a pressure of less than 1333 Pa and at a temperature of from 20 to 30° C.
Claim 31
Dependent Claim
23 words
The method according to claim 23, wherein the step of de-airing the mixture comprises de-airing components (A) through (F) individually prior to mixing.
Claim 32
Dependent Claim
25 words
The method according to claim 23, wherein the step of de-airing the mixture comprises de-airing partial mixtures of components (A) through (F) prior to mixing.
Claim 33
Dependent Claim
10 words
A composition prepared according to the method of claim 23.
Claim 34
Dependent Claim
10 words
A composition prepared according to the method of claim 24.
Claim 35
Dependent Claim
10 words
A composition prepared according to the method of claim 25.
Claim 36
Dependent Claim
10 words
A composition prepared according to the method of claim 26.
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