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US4490416A
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Organosiloxane-oxyalkylene copolymers
Assignee: Dow Silicones UK Ltd
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Filing: 1984-05-15
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Granted: 1984-12-25
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Expires: 2004-05-15
Abstract
Abstract Organosiloxane-oxyalkylene copolymers in which at least one silicon atom of an organosiloxane unit has attached thereto a group ##STR1## in which X is a divalent hydrocarbon group, R is an alkylene group, n is an integer of at least 2, Z is an organic substituent containing an epoxy group, R' is lower alkyl, vinyl or phenyl, R" is alkyl or alkoxyalkyl and a is 0 or 1, at least 40 percent of the total substituents in the copolymer being methyl. The copolymers are film forming and may be applied to continuous or porous substrates from aqueous or non-aqueous solutions.
Inventors
- 👤 Stephen Westall
- 👤 James W. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:51
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C08G77/46
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
189 words
An organosiloxane-oxyalkylene copolymer wherein at least one silicon atom of an organosiloxane unit has attached thereto a group represented by the general formula ##STR14## wherein X represents a divalent hydrocarbon group having from 2 to 8 carbon atoms, R represents an alkylene group having from 2 to 4 carbon atoms, n is an integer of at least 2, Z represents an organic group composed of carbon, hydrogen and oxygen and having therein at least one epoxy group, R' represents a lower alkyl, vinyl or phenyl group, R" represents an alkyl or an alkoxyalkyl group having less than 7 carbon atoms and a has a value of 0 or 1, the remaining silicon-bonded substituents in the organosiloxane units being selected from hydrogen atoms, monovalent hydrocarbon groups and groups represented by the general formula --X(OR).sub.n OG wherein X and R are as hereinabove defined and G represents a hydrogen atom, a monovalent hydrocarbon group having from 1 to 10 carbon atoms or an acyl group having from 2 to 6 carbon atoms, at least 40 percent of the total substituents bonded to siloxane silicon atoms in the copolymer being methyl groups.
Claim 2
Dependent Claim
189 words
An organosiloxane-oxyalkylene copolymer wherein at least one silicon atom of an organosiloxane unit has attached thereto a group represented by the general formula ##STR14## wherein X represents a divalent hydrocarbon group having from 2 to 8 carbon atoms, R represents an alkylene group having from 2 to 4 carbon atoms, n is an integer of at least 2, Z represents an organic group composed of carbon, hydrogen and oxygen and having therein at least one epoxy group, R' represents a lower alkyl, vinyl or phenyl group, R" represents an alkyl or an alkoxyalkyl group having less than 7 carbon atoms and a has a value of 0 or 1, the remaining silicon-bonded substituents in the organosiloxane units being selected from hydrogen atoms, monovalent hydrocarbon groups and groups represented by the general formula --X(OR).sub.n OG wherein X and R are as hereinabove defined and G represents a hydrogen atom, a monovalent hydrocarbon group having from 1 to 10 carbon atoms or an acyl group having from 2 to 6 carbon atoms, at least 40 percent of the total substituents bonded to siloxane silicon atoms in the copolymer being methyl groups.
Claim 3
Dependent Claim
24 words
An organosiloxane-oxyalkylene copolymer as claimed in claim 1 wherein the OR units are selected from oxyethylene units, oxopropylene units and mixtures of such units.
Claim 4
Dependent Claim
20 words
An organosiloxane-oxyalkylene copolymer as claimed in claim 1 wherein R" represents a group selected from methyl, ethyl and methoxyethyl groups.
Claim 5
Dependent Claim
133 words
A process for the preparation of an organosiloxane-oxyalkylene copolymer as defined in claim 1 which comprises reacting together (A) an organosiloxane-oxyalkylene copolymer wherein at least one silicon atom of an organosiloxane unit has attached thereto a group represented by the general formula --(OR).sub.n OH the remaining silicon-bonded substituents in the organosiloxane units being selected from hydrogen atoms, monovalent hydrocarbon groups and groups represented by the general formula --X(OR).sub.n OG at least 40 percent of the total substituents bonded to siloxane silicon atoms in the copolymer being methyl groups, and (B) an organosilane ZSiR'.sub.a (OR").sub.3-a wherein X, R, Z, R', R" and a are as defined in claim 1 and G represents a monovalent hydrocarbon group having from 1 to 10 carbon atoms or an acyl group having from 2 to 6 carbon atoms.
Claim 6
Dependent Claim
20 words
A process as claimed in claim 4 wherein the reaction is carried out in the presence of a transesterification catalyst.
Claim 7
Dependent Claim
24 words
A process for coating a substrate which comprises applying thereto an organosiloxane-oxyalkylene copolymer as defined in claim 1 and thereafter curing the applied copolymer.
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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |