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Patent US4523002A successfully refreshed from Google Patents.
US4523002A
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Ionically cross-linked siloxane polymers
Assignee: General Electric Co
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Filing: 1984-01-04
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Granted: 1985-06-11
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Expires: 2004-01-04
Abstract
Abstract Zwitterionic siloxane polymers containing tertiary silicone atoms with zwitterions and their aminoalkyl siloxane polymer intermediates production are provided. Methods of their production are also provided. The aminoalkyl siloxane polymer intermediates and the zwitterionic siloxane polymers are obtained by co-polymerizing trifunctional aminoalkyl silanes or zwitterionic silanes, respectively, with hydroxy-terminated siloxane oligomers in the presence of an acid catalyst. The aminoalkyl siloxane polymer intermediates are converted to zwitterionic siloxane polymer by reaction with an organosultone or an organolactone. Trifunctional aminoalkyl silanes are readily available and utilizing these silanes provides an economical route to obtaining zwitterionic siloxane polymers.
Inventors
- 👤 John R. Campbell
- 👤 Robert E. Williams, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:39
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/26; C08G77/38; C08G77/382; C08G77/388; C08G77/392; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
57 words
A method of producing zwitterionic siloxane polymers comprising a. copolymerizing an aminoalkyl-trialkoxy-silane with a hydroxy-endcapped siloxane oligomer in the presence of a catalytic quantity of acid to provide an aminoalkyl-siloxane polymer intermediate; and b. reacting said aminoalkyl siloxane polymer intermediate with a member from the group consisting of organo-lactones and organo-sultones in the presence of a solvent.
Claim 2
Independent Claim
57 words
A method of producing zwitterionic siloxane polymers comprising a. copolymerizing an aminoalkyl-trialkoxy-silane with a hydroxy-endcapped siloxane oligomer in the presence of a catalytic quantity of acid to provide an aminoalkyl-siloxane polymer intermediate; and b. reacting said aminoalkyl siloxane polymer intermediate with a member from the group consisting of organo-lactones and organo-sultones in the presence of a solvent.
Claim 3
Dependent Claim
17 words
A method as in claim 1 wherein the aminoalkyl siloxane polymer intermediate is reacted with γ-propane sultone.
Claim 4
Independent Claim
74 words
A method of producing zwitterionic siloxane polymers comprising the steps of a. reacting N-(2-aminoethyl)-3-aminopropyl trimethoxysilane with a hydroxy-endcapped polydimethyl-siloxane fluid of the formula ##STR9## wherein m is an integer of from 3 to 800, in the presence of a catalytic quantity of acetic acid at a temperature in the range of about 20° to 100° C.; and b. reacting γ-propane sultone with the reaction product of step A in the presence of a solvent.
Claim 5
Independent Claim
74 words
A method of producing zwitterionic siloxane polymers comprising the steps of a. reacting N-(2-aminoethyl)-3-aminopropyl trimethoxysilane with a hydroxy-endcapped polydimethyl-siloxane fluid of the formula ##STR9## wherein m is an integer of from 3 to 800, in the presence of a catalytic quantity of acetic acid at a temperature in the range of about 20° to 100° C.; and b. reacting γ-propane sultone with the reaction product of step A in the presence of a solvent.
Claim 6
Dependent Claim
37 words
A method as in claim 3 wherein the concentration of acetic acid within the solvent medium falls within the range of 0.05 to 1.0 weight percent of the hydroxy endcapped polydimethylsiloxane fluid and the trifunctional silane combined.
Claim 7
Independent Claim
83 words
A method of producing zwitterionic siloxane polymers comprising co-polymerizing a trifunctional zwitterionic silane of the formula R.sup.x --Si--(OR.sup.b).sub.3 with a hydroxy-endcapped siloxane oligomer in the presence of a catalytic quantity of acid and a solvent wherein R x is a radical selected from the group consisting of aminoalkyl-sulfonates and aminoalkyl carboxylates and R b is a monovalent radical selected from the group consisting of alkyl radicals of from 1 to 20 carbon atoms and aryl radicals of from 6 to 20 carbon atoms.
Claim 8
Independent Claim
83 words
A method of producing zwitterionic siloxane polymers comprising co-polymerizing a trifunctional zwitterionic silane of the formula R.sup.x --Si--(OR.sup.b).sub.3 with a hydroxy-endcapped siloxane oligomer in the presence of a catalytic quantity of acid and a solvent wherein R x is a radical selected from the group consisting of aminoalkyl-sulfonates and aminoalkyl carboxylates and R b is a monovalent radical selected from the group consisting of alkyl radicals of from 1 to 20 carbon atoms and aryl radicals of from 6 to 20 carbon atoms.
Claim 9
Dependent Claim
30 words
A method as in claim 5 wherein the acid catalyst is selected from the group consisting of acetic acid, trifluoroacetic acid, formic acid, hydrofluoric acid, hydrochloric acid and phosphoric acid.
Claim 10
Independent Claim
55 words
A method of producing zwitterionic siloxane polymers comprising copolymerizing N-(3-propane-sulfonate)-γ-aminopropyl-trimethoxy with a hydroxy-endcapped polydimethylsiloxane fluid of the formula ##STR10## wherein m is an integer of from 3 to 800; in the presence of a catalytic quantity of acetic acid and a solvent at a temperature in the range of about 20° C. to 100° C.
Claim 11
Independent Claim
55 words
A method of producing zwitterionic siloxane polymers comprising copolymerizing N-(3-propane-sulfonate)-γ-aminopropyl-trimethoxy with a hydroxy-endcapped polydimethylsiloxane fluid of the formula ##STR10## wherein m is an integer of from 3 to 800; in the presence of a catalytic quantity of acetic acid and a solvent at a temperature in the range of about 20° C. to 100° C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |