US3855171A
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Organopolysiloxane compositions
Assignee: Wacker Chemie AG
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Filing: 1972-05-01
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Granted: 1974-12-17
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Expires: 1992-05-01
Abstract
Abstract This invention relates to compositions containing organopolysiloxanes and pyrogenically produced mixed oxides of boron and an element selected from the class consisting of silicon, aluminum, titanium and iron in which the boron calculated as elemental boron is present in an amount of from 2 to 20 percent by weight. These compositions may be used in the preparation of self-adhering elastomers and putty-like materials which exhibit a high degree of elasticity under suddenly applied stress.
Inventors
- 👤 K Wegehaupt
- 👤 G Kratel
- 👤 M Leiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:00
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/38; C09; C09J; C09J7/00; C09J7/10; C09J2301/00; C09J2301/40; C09J2301/408
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
23 words
A COMPOSITION COMPRISING AN ORGANOPOLYSILOXANE IN WHICH AT LEAST ABOUT 80 PERCENT BY WEIGHT OF THE ORGANOPOLYSILOXANE IS A DIORGANOPOLYSILOXANE OF THE FORMULA
Claim 2
Dependent Claim
23 words
A COMPOSITION COMPRISING AN ORGANOPOLYSILOXANE IN WHICH AT LEAST ABOUT 80 PERCENT BY WEIGHT OF THE ORGANOPOLYSILOXANE IS A DIORGANOPOLYSILOXANE OF THE FORMULA
Claim 3
Dependent Claim
23 words
The composition of claim 1, wherein the mixed oxides contain from 5 to 10 percent by weight of boron calculated as elemental boron.
Claim 4
Dependent Claim
14 words
The composition of claim 1, wherein the mixed oxides are boron and silicon oxides.
Claim 5
Dependent Claim
16 words
The composition of claim 1, wherein the mixed oxides are obtained by the flame hydrolysis technique.
Claim 6
Dependent Claim
32 words
The composition of claim 1, wherein the boron calculated as boric acid anhydride is present in an amount of from 0.005 to 0.09 percent by weight, based on the weight of organopolysiloxane.
Claim 7
Dependent Claim
31 words
The composition of claim 1, wherein the boron calculated as elemental boron is present in an amount of from 0.005 to 20 percent by weight, based on the weight of organopolysiloxane.
Claim 8
Dependent Claim
14 words
The composition of claim 1, wherein n has a value of at least 50.
Claim 9
Dependent Claim
23 words
The composition of claim 1, wherein some of the hydroxyl groups have been replaced by groups which can be condensed with SiOH groups.
Claim 10
Dependent Claim
19 words
The composition of claim 1, wherein at least 50 percent of the number of R radicals are methyl radicals.
Claim 11
Dependent Claim
21 words
The composition of claim 9, wherein the remaining R radicals are selected from the class consisting of phenyl and vinyl radicals.
Claim 12
Dependent Claim
21 words
The composition of claim 1, wherein the viscosity of the organopolysiloxane is from 100 to 10 X 106 cs. at 25*C.
Claim 13
Dependent Claim
11 words
The composition of claim 1, which also includes a cross-linking agent.
Claim 14
Dependent Claim
11 words
The composition of claim 1, which also includes a curing agent.
Claim 15
Independent Claim
184 words
A method for preparing a composition having a high degree of elasticity which comprises mixing at a temperature up to about 100*C. an organopolysiloxane in which at least about 80 percent by weight of the organopolysiloxane is a diorganopolysiloxane of the formula (HO)x(SiRyO4-y/2)n H in which R is selected from the group consisting of monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals and cyanoalkyl radicals, n is an integer of at least 3, x has an average value of from 0.99 to 1.01, y has an average value of from 1.99 to 2.01, and sum of x + y is 3 with pyrogenically mixed oxides of boron and an element selected from the class consisting of silicon, aluminum, titanium and iron, in which the boron calculated as elemental boron is present in an amount of from 2 to 20 percent by weight based on the organopolysiloxane and the mixed oxides are present in an amount of from 0.005 to 20 percent by weight of boron based on the weight of the organopolysiloxane, to form borosiloxanes and thereafter adding sufficient filler to form a putty-like composition.
Claim 16
Independent Claim
184 words
A method for preparing a composition having a high degree of elasticity which comprises mixing at a temperature up to about 100*C. an organopolysiloxane in which at least about 80 percent by weight of the organopolysiloxane is a diorganopolysiloxane of the formula (HO)x(SiRyO4-y/2)n H in which R is selected from the group consisting of monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals and cyanoalkyl radicals, n is an integer of at least 3, x has an average value of from 0.99 to 1.01, y has an average value of from 1.99 to 2.01, and sum of x + y is 3 with pyrogenically mixed oxides of boron and an element selected from the class consisting of silicon, aluminum, titanium and iron, in which the boron calculated as elemental boron is present in an amount of from 2 to 20 percent by weight based on the organopolysiloxane and the mixed oxides are present in an amount of from 0.005 to 20 percent by weight of boron based on the weight of the organopolysiloxane, to form borosiloxanes and thereafter adding sufficient filler to form a putty-like composition.
Claim 17
Dependent Claim
42 words
The method of claim 14, wherein the organopolysiloxane and the mixed oxides are combined with a catalyst, and a curing agent and thereafter formed into the desired configuration before heating to a temperature up to about 300*C. to partially cure the coMposition.
Claim 18
Dependent Claim
14 words
The method of claim 14, wherein the mixed oxides are boron and silicon oxides.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |