US4308372A
Expired / Lapsed
US
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Shelf-stable one-part room temperature vulcanizable silicone rubber compositions
Assignee: General Electric Co
•
Filing: 1979-06-25
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Granted: 1981-12-29
•
Expires: 1999-06-25
Abstract
Abstract A shelf-stable catalyst composition for a one-part room temperature vulcanizable silicone rubber composition comprising the reaction product of an adhesion promoter selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates and silyl cyanurates and with an acyloxy functional cross-linking agent.
Inventors
- 👤 Alfred H. Smith, Jr.
- 👤 John J. Dziark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:16
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/08; C08G77/14; C08G77/16; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
108 words
A shelf-stable catalyst composition for a one-part room temperature vulcanizable silicone rubber composition comprising the reaction product of an adhesion promoter selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates and silyl cyanurates with an acyloxy functional silane cross-linking agent wherein there is present from 40 to 80 parts by weight of the acyloxy functional silane and from 5 to 15 parts by weight of the adhesion promoter and wherein the adhesion promoter is reacted with the acyloxy functional silane at a temperature in the range of 50° to 150° C. for a period of time varying from 1 hour to 7 days.
Claim 2
Dependent Claim
108 words
A shelf-stable catalyst composition for a one-part room temperature vulcanizable silicone rubber composition comprising the reaction product of an adhesion promoter selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates and silyl cyanurates with an acyloxy functional silane cross-linking agent wherein there is present from 40 to 80 parts by weight of the acyloxy functional silane and from 5 to 15 parts by weight of the adhesion promoter and wherein the adhesion promoter is reacted with the acyloxy functional silane at a temperature in the range of 50° to 150° C. for a period of time varying from 1 hour to 7 days.
Claim 3
Dependent Claim
39 words
The composition of claim 1 wherein the acyloxy functional silane has the formula, R.sub.a Si(OAc).sub.4-a where R is a monovalent radical, Ac is an acyloxy radical from 2 to 30 carbon atoms and a varies from 1 to 3.
Claim 4
Dependent Claim
41 words
The composition of claim 2 wherein there is further present in the catalyst system from 0.01 to 15 parts by weight of a metal salt of a carboxylic acid with the metal varying from lead to manganese in the Periodic Table.
Claim 5
Dependent Claim
30 words
The composition of claim 2 wherein the reaction product is obtained by reacting the adhesion promoter with the acyloxy functional silane at a temperature in the range of 80°-110° C.
Claim 6
Dependent Claim
14 words
The composition of claim 3 wherein the acyloxy functional silane is methyl tris(2-ethylhexanoxy) silane.
Claim 7
Dependent Claim
13 words
The composition of claim 3 wherein the acyloxy functional silane is methyl trimethoxysilane.
Claim 8
Dependent Claim
16 words
The composition of claim 3 wherein the metal salt of a carboxylic acid dibutyl tin diacetate.
Claim 9
Dependent Claim
68 words
The composition of claim 3 further including a silanol end-stopped diorganopolysiloxane of the formula, ##STR9## where R 18 and R 21 are monovalent hydrocarbon radicals and t varies such that the polymer has a viscosity varying from 500 to 1,000,000 centipoise at 25° C. wherein per 100 parts by weight of the above polymer there is present from 2 to 20 parts by weight of the catalyst composition.
Claim 10
Dependent Claim
14 words
The composition of claim 3 wherein the acyloxy functional silane is methyl tris(benzoxy) silane.
Claim 11
Dependent Claim
27 words
The composition of claim 8 wherein there is present from 4 to 500 parts by weight of a filler per 100 parts of the silanol end-stopped diorganopolysiloxane.
Claim 12
Dependent Claim
22 words
The composition of claim 10 wherein the filler is selected from the class consisting of fumed silica, precipitated silica and calcium carbonate.
Claim 13
Dependent Claim
99 words
The composition of claim 11 wherein further including from 2 to 20 parts by weight based on 100 parts of the silanol end-stopped diorganopolysiloxane a fluid polysiloxane containing a high degree of trifunctionality, tetrafunctionality or a mixture of tri- and tetrafunctionality and comprising; (i) from 5 to 60 mole percent of monoalkylsiloxy units, siloxy units or a mixture of such units; (ii) from 1 to 6 mole percent of trialkylsiloxy units; and (iii) from 34 to 94 mole percent of dialkylsiloxy units, said polysiloxane containing from about 0.1 to about 2 percent by weight of silicone bonded hydroxyl groups.
Claim 14
Dependent Claim
31 words
The composition of claim 12 which further includes from 1 to 10 parts by weight per 1.0 parts of the silanol end-stopped diorganopolysiloxane of a finely divided iron oxide thermal stabilizer.
Claim 15
Dependent Claim
29 words
The composition of claim 13 wherein per 100 parts of the silanol end-stopped diorganopolysiloxane polymer there is present from 1 to 10 parts of fumed silica treated with octamethylcyclotetrasiloxane.
Claim 16
Dependent Claim
14 words
The composition of claim 14 wherein the adhesion promoter is 1,3,5-tris-trimethoxy silyl propyl isocyanurate.
Claim 17
Dependent Claim
14 words
The composition of claim 14 wherein the adhesion promoter is bis(trimethoxy silyl propyl) maleate.
Claim 18
Dependent Claim
31 words
The composition of claim 14 wherein per 100 parts of the silanol end-stopped diorganopolysiloxane there is present from 0.03 to 2.0 parts by weight of a polyether as a sag-control additive.
Claim 19
Dependent Claim
38 words
The composition of claim 14 wherein the composition further contains from 1 to 50 parts by weight of a triorganosilyl end-stopped diorganopolysiloxane polymer having from 10 to 5,000 centipoise viscosity where said organo groups are monovalent hydrocarbon radicals.
Claim 20
Dependent Claim
119 words
A process for forming a shelf-stable catalyst composition for a one-part room temperature vulcanizable silicone rubber composition comprising reacting an adhesion promoter selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates and silyl cyanurates with an acyloxy functional silane cross-linking agent before incorporating the catalyst composition with the rest of the ingredients wherein there is present from 40 to 80 parts by weight of the acyloxy functional silane and from 5 to 15 parts by weight of the adhesion promoter wherein the adhesion promoter is reacted with the acyloxy functional silane at a temperature in the range of 50° to 150° C. for a period of time varying from 1 hour to 7 days.
Claim 21
Dependent Claim
119 words
A process for forming a shelf-stable catalyst composition for a one-part room temperature vulcanizable silicone rubber composition comprising reacting an adhesion promoter selected from the class consisting of silyl maleates, silyl fumarates, silyl succinates, silyl isocyanurates and silyl cyanurates with an acyloxy functional silane cross-linking agent before incorporating the catalyst composition with the rest of the ingredients wherein there is present from 40 to 80 parts by weight of the acyloxy functional silane and from 5 to 15 parts by weight of the adhesion promoter wherein the adhesion promoter is reacted with the acyloxy functional silane at a temperature in the range of 50° to 150° C. for a period of time varying from 1 hour to 7 days.
Claim 22
Dependent Claim
41 words
The process of claim 19 wherein there is further present in the catalyst system from 0.01 to 15 parts by weight of a metal salt of a carboxylic acid with the metal varying from lead to manganese in the Periodic Table.
Claim 23
Dependent Claim
14 words
The process of claim 20 wherein the acyloxy functional silane is methyl tris(2-ethylhexanoxy) silane.
Claim 24
Dependent Claim
15 words
The process of claim 20 wherein the acyloxy functional silane is methyl tris acetoxy silane.
Claim 25
Dependent Claim
17 words
The process of claim 20 wherein the metal salt of a carboxylic acid is dibutyl tin diacetate.
Claim 26
Dependent Claim
71 words
The process of claim 20 further including a silanol end-stopped diorganopolysiloxane polymer of the formula, ##STR10## where R 18 and R 21 are monovalent hydrocarbon radicals and t varies such that the polymer has a viscosity varying from 500 to 1,000,000 centipoise at 25° C. wherein per 100 parts by weight of the above polymer there is present from 2 to 20 parts by weight of the catalyst reaction product composition.
Claim 27
Dependent Claim
14 words
The process of claim 20 wherein the acyloxy functional silane is methyl tris(benzoxy) silane.
Claim 28
Dependent Claim
28 words
The process of claim 24 wherein there is present from 4 to 30 parts by weight of a filler per 100 parts of a silanol end-stopped diorganopolysiloxane polymer.
Claim 29
Dependent Claim
25 words
The process of claim 26 wherein the filler is selected from the class consisting of fumed silica, precipitated silica and calcium carbonate and mixtures thereof.
Claim 30
Dependent Claim
117 words
The process of claim 24 where there is further mixed in the composition from 2 to 20 parts by weight based on 100 parts of the silanol end-stopped diorganopolysiloxane polymer of fluid polysiloxane containing a high degree of trifunctionality, tetrafunctionality or a mixture of tri- and tetrafunctionality and comprising; (i) from 5 to 60 mole percent of monoalkyl siloxy units or a mixture of such units; (ii) from 1 to 6 mole percent of trialkyl siloxy units; (iii) from 34 to 94 mole percent of dialkyl siloxy units, said polysiloxane containing from 0.1 to about 2 percent by weight of hydroxyl groups and wherein such fluid is added to the mixture after the reaction product is formed.
Claim 31
Dependent Claim
37 words
The process of claim 28 wherein there is further mixed into the composition from 1 to 10 parts by weight per 100 parts of the silanol end-stopped diorganopolysiloxane polymer of a finely divided iron oxide thermal stabilizer.
Claim 32
Dependent Claim
51 words
The process of claim 29 where there is further mixed into the composition per 100 parts of the silanol end-stopped diorganopolysiloxane polymer from 1 to 50 parts by weight of triorgano silyl end-stopped diorganopolysiloxane polymer having from 10 to 5,000 centipoise viscosity where such said organo groups are monovalent hydrocarbon radicals.
Claim 33
Dependent Claim
14 words
The process of claim 30 wherein the adhesion promoter is 1,3,5-tris-trimethoxy silyl propyl isocyanurate.
Claim 34
Dependent Claim
12 words
The process of claim 30 where the adhesion promoter is bis(tri-methoxysilylpropyl) maleate.
Claim 35
Dependent Claim
32 words
The process of claim 30 where per 100 parts of the silanol end-stopped diorganopolysiloxane polymer there is present from 0.03 to 2.0 parts by weight of a polyether as a sag-control additive.
Claim 36
Dependent Claim
34 words
The process of claim 30 wherein there is further mixed into the composition per 100 parts of the silanol end-stopped diorganopolysiloxane polymer, from 4 to 28 parts of fumed silica treated with octamethyl cyclotetrasiloxane.
Claim 37
Dependent Claim
39 words
The process of claim 19 wherein the acyloxy functional silane has the formula, R.sub.a Si(OAc).sub.4-a where R is a monovalent radical, Ac is an acyloxy radical from 2 to 30 carbon atoms and a varies from 1 to 3.
Claim 38
Dependent Claim
32 words
The process of claim 35 wherein the reaction product is obtained by reacting the adhesion promoter with the acyloxy functional silane at a temperature in the range of 80° to 110° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |