US3862919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organopolysiloxane compositions having resilient properties
Assignee: Wacker Chemie AG
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Filing: 1973-12-05
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Granted: 1975-01-28
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Expires: 1993-12-05
Abstract
Abstract The invention relates to a method for preparing compositions having a high degree of elasticity under suddenly applied stress by mixing a composition containing diorganopolysiloxanes in which a few siloxane units or silanes are present which have a functionality higher than the functionality of the diorganopolysiloxane units with a condensation catalyst obtained from the reaction of dialkyldialkoxysilanes and tin carboxylates.
Inventors
- 👤 Siegfried Nitzsche
- 👤 Paul Hittmair
- 👤 Wolfgang Hechtl
- 👤 Ernst Wohlfarth
- 👤 Manfred Mittermeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:53
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/0272; B01J31/0274; B01J31/0201; B01J31/0211; B01J31/12; B01J31/122; C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/22; C07F7/2224; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
26 words
The composition of claim 1 wherein the amount of condensation catalyst is from about 0.5 to about 10 percent based on the weight of the organopolysiloxane.
Claim 2
Dependent Claim
34 words
The composition of claim 1 wherein the condensation catalyst is obtained from the reaction of from 2 gram-atoms of tin per mole of dialkyldialkoxysilane to 1 gram-atom of tin per 2 moles of dialkyldialkoxysilane.
Claim 3
Dependent Claim
27 words
The composition of claim 1 wherein the condensation catalyst is prepared by reacting a dialkyldialkoxysilane with a tin carboxylate and thereafter removing the carboxylic acid ester by-product.
Claim 4
Dependent Claim
18 words
The composition of claim 3 wherein the condensation catalyst is obtained from the reaction of dibutyltindiacetate and dimethyldiethoxysilane.
Claim 5
Independent Claim
105 words
A method for preparing a composition having a high degree of elasticity under suddenly applied stress which comprises mixing a condensation catalyst obtained from the reaction of a dialkyldialkoxysilane and a tin carboxylate at a temperature of from 50* to 200*C. with an organopolysiloxane containing condensible groups and having diorganosiloxane units and a small amount of siloxane units or silanes whose functionality is greater than the functionality of the diorganopolysiloxane units, said silanes are represented by the formula RaSiX''4-aand said siloxane units are selected from units of the formula RSiO3/2 and SiO4/2 in which these siloxane units can be substituted by units of the formula
Claim 6
Dependent Claim
25 words
The method of claim 6 wherein the composition is prepared in the absence of moisture and thereafter exposed to atmospheric moisture to cure the same.
Claim 7
Dependent Claim
34 words
The method of claim 6 wherein the condensation catalyst is obtained from the reaction of from 2 gram-atoms of tin per mole of dialkyldialkoxysilane to 1 gram-atom of tin per 2 moles of dialkyldialkoxysilane.
Claim 8
Dependent Claim
36 words
The composition of claim 1 wherein said composition contains at least one RSiO3/2 or RSiX3'' unit for each 100 to 1000 diorganopolysiloxane units or at least one SiO4/2 unit for each 200 to 2,000 diorganosiloxane units.
Claim 9
Dependent Claim
41 words
In the composition of claim 9 when said composition contains siloxane units of the formula R3SiO1/2, then said composition contains an excess of at least one RSiO3/2 unit or RSiX3'' unit for each R3SiO1/2 unit per 100 to 1,000 diorganopolysiloxane units.
Claim 10
Dependent Claim
39 words
In the composition of claim 9 when said composition contains siloxane units of the formula R3SiO1/2, then said composition contains an excess of at least one SiO4/2 unit for each two R3SiO1/2 units per 200 to 2,000 diorganopolysiloxane units.
References Cited (Backward Citations)
US3186963A
Cited
US3772240A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |