Patent US4032499A successfully refreshed from Google Patents.
US4032499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing modified polysiloxanes
Assignee: Consortium fuer Elektrochemische Industrie GmbH
•
Filing: 1975-01-31
•
Granted: 1977-06-28
•
Expires: 1995-01-31
Abstract
Abstract An improved method for preparing modified organopolysiloxanes which comprises graft polymerizing monomers containing aliphatic unsaturation onto organopolysiloxanes in the presence of a free radical and an inert liquid having a boiling point up to about 100° C. at 760 mm Hg (abs.) and which is a nonsolvent for the organopolysiloxanes and the graft polymers at the applicable polymerization temperatures.
Inventors
- 👤 Franz-Heinrich Kreuzer
- 👤 Manfred Wick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:02
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/12; C08F283/122
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A method for preparing modified organopolysiloxanes which comprises contacting an organopolysiloxane in which the organic groups connected to the silicon atoms are selected from the group consisting of monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals and cyanoalkyl radicals with a monomer having aliphatic unsaturation in the presence of a free radical initiator and an inert liquid having a boiling point up to 100° C. at 760 mm Hg (abs.) in which the inert liquid is present in an amount of from 2 to 20 percent by weight based on the total weight of the organopolysiloxane, monomer and free radical initiator and is a nonsolvent at the polymerization temperature for the organopolysiloxane and the polymers obtained from the polymerization and the weight ratio of the organopolysiloxane to monomer is from 10:90 to 90:10.
Claim 2
Independent Claim
132 words
A method for preparing modified organopolysiloxanes which comprises contacting an organopolysiloxane in which the organic groups connected to the silicon atoms are selected from the group consisting of monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals and cyanoalkyl radicals with a monomer having aliphatic unsaturation in the presence of a free radical initiator and an inert liquid having a boiling point up to 100° C. at 760 mm Hg (abs.) in which the inert liquid is present in an amount of from 2 to 20 percent by weight based on the total weight of the organopolysiloxane, monomer and free radical initiator and is a nonsolvent at the polymerization temperature for the organopolysiloxane and the polymers obtained from the polymerization and the weight ratio of the organopolysiloxane to monomer is from 10:90 to 90:10.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein water is the inert liquid.
Claim 4
Dependent Claim
29 words
The method of claim 1 wherein the free radical initiator is present in an amount of from 0.01 to 5 percent based on the total weight of the reactants.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein the organopolysiloxane is a hydroxyl-terminated dimethylpolysiloxane.
Claim 6
Dependent Claim
29 words
The method of claim 1 wherein the free radical initiator is gradually added to a preformed mixture heated to the polymerization temperature containing the organopolysiloxane, monomer and inert liquid.
Claim 7
Dependent Claim
37 words
The method of claim 1 wherein the inert liquid is selected from the class consisting of water, methanol and saturated aliphatic fluoro- and chlorohydrocarbons in which three halogen atoms are linked to at least one carbon atom.
Claim 8
Dependent Claim
18 words
The method of claim 1 wherein the weight ratio of organopolysiloxane to monomer is from 20:80 to 60:40.
References Cited (Backward Citations)
US3694478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |