US4587136A
Expired / Lapsed
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Curable organopolysiloxane compositions
Assignee: Dow Silicones UK Ltd
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Filing: 1985-03-20
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Granted: 1986-05-06
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Expires: 2005-03-20
Abstract
Abstract Compositions curable by radiation e.g. UV radiation are disclosed and claimed which comprise an organosiloxane having at least two siloxane units including groups --RSH, an organosiloxane having at least two siloxane units including ethylcyclohexenyl groups, and a photoinitiator. The compositions cure on exposure to UV radiation and may be used to produce on a variety of substrates coatings which are of reduced odor. Also, disclosed and claimed is a method of treating a substrate which comprises applying a coating of such compositions and irradiating the coating. Examples given refer to production of coatings on paper substrates to provide cured coatings.
Inventors
- 👤 James W. White
- 👤 Brian J. Griffiths
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:54
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08L83/08; C08K; C08K5/00; C08K5/0008; C08K5/0025; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31533; Y10T428/31551; Y10T428/31562; Y10T428/31565; Y10T428/31573; Y10T428/31587; Y10T428/31652; Y10T428/31663; Y10T428/31667
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
246 words
A curable organosiloxane composition comprising (A) an organosiloxane having in the molecule at least two siloxane units of the general formula ##STR19## wherein R represents a divalent saturated aliphatic hydrocarbon group having from 3 to 8 inclusive carbon atoms, R' represents a monovalent hydrocarbon group having from 1 to 6 inclusive carbon atoms and free of aliphatic unsaturation, an alkoxy group having from 1 to 4 carbon atoms or an alkoxyalkoxy group having from 2 to 6 carbon atoms and a has a value of 0, 1 or 2, any remaining units having the general formula ##STR20## wherein R" represents a monovalent hydrocarbon group having from 1 to 6 carbon atoms and free of aliphatic unsaturation and b has a value of 0, 1, 2 or 3 at least 50 percent of the total R' and R" groups being methyl, (B) an organosiloxane having in the molecule at least two units of the general formula ##STR21## wherein Q represents a monovalent hydrocarbon group having from 1 to 6 inclusive carbon atoms and free of aliphatic unsaturation, an alkoxy group having from 1 to 4 carbon atoms or an alkoxyalkoxy group having from 2 to 6 carbon atoms and c is 0, 1 or 2, any remaining units having the general formula ##STR22## wherein Q' is as defined for R" and d has a value of 0, 1, 2 or 3, at least 50 percent of the total Q and Q' groups being methyl, and (C) photoinitiator.
Claim 2
Dependent Claim
246 words
A curable organosiloxane composition comprising (A) an organosiloxane having in the molecule at least two siloxane units of the general formula ##STR19## wherein R represents a divalent saturated aliphatic hydrocarbon group having from 3 to 8 inclusive carbon atoms, R' represents a monovalent hydrocarbon group having from 1 to 6 inclusive carbon atoms and free of aliphatic unsaturation, an alkoxy group having from 1 to 4 carbon atoms or an alkoxyalkoxy group having from 2 to 6 carbon atoms and a has a value of 0, 1 or 2, any remaining units having the general formula ##STR20## wherein R" represents a monovalent hydrocarbon group having from 1 to 6 carbon atoms and free of aliphatic unsaturation and b has a value of 0, 1, 2 or 3 at least 50 percent of the total R' and R" groups being methyl, (B) an organosiloxane having in the molecule at least two units of the general formula ##STR21## wherein Q represents a monovalent hydrocarbon group having from 1 to 6 inclusive carbon atoms and free of aliphatic unsaturation, an alkoxy group having from 1 to 4 carbon atoms or an alkoxyalkoxy group having from 2 to 6 carbon atoms and c is 0, 1 or 2, any remaining units having the general formula ##STR22## wherein Q' is as defined for R" and d has a value of 0, 1, 2 or 3, at least 50 percent of the total Q and Q' groups being methyl, and (C) photoinitiator.
Claim 3
Dependent Claim
61 words
A composition according to claim 1 wherein the organosiloxane (A) is a copolymer containing units of formulae (i) and (ii) in which the substituent R comprises --(CH 2 ) 3 --, CH 2 CH(CH 3 )CH 2 --(CH 2 ) 4 -- or --(CH 2 ) 6 -- and at least 50% of the R' and R" substituents are methyl groups.
Claim 4
Dependent Claim
23 words
A composition according to claim 1 wherein the polysiloxane (A) has from 5 to 20% siloxane groups according to the general formula (i).
Claim 5
Dependent Claim
42 words
A composition according to claim 1 wherein the organosiloxane (B) is according to the average general formula ##STR23## wherein x denotes the cyclohexyenylethyl group has a value from about 5 to about 20 and m has a value greater than about 140.
Claim 6
Dependent Claim
24 words
A composition according to claim 4 wherein each Q' represents the methyl group and m has a value from about 140 to about 500.
Claim 7
Dependent Claim
31 words
A composition according to claim 1 wherein the organosiloxanes (A) and (B) are used in amounts to provide a ratio of --SH groups to --C═C-- groups of the order of 2:1.
Claim 8
Dependent Claim
269 words
A process for treating a substrate which comprises applying to a substrate a coating of a curable organosiloxane composition comprising (A) an organosiloxane having in the molecule at least two siloxane units of the general formula ##STR24## wherein R represents a divalent saturated aliphatic hydrocarbon group having from 3 to 8 inclusive carbon atoms, R' represents a monovalent hydrocarbon group having from 1 to 6 inclusive carbon atoms and free of aliphatic unsaturation, an alkoxy group having from 1 to 4 carbon atoms or an alkoxyalkoxy group having from 2 to 6 carbon atoms and a has a value of 0, 1 or 2, any remaining units having the general formula ##STR25## wherein R" represents a monovalent hydrocarbon group having from 1 to 6 carbon atoms and free of aliphatic unsaturation and b has a value of 0, 1, 2 or 3 at least 50 percent of the total R' and R" groups being methyl, (B) an organosiloxane having in the molecule at least two units of the general formula ##STR26## wherein Q represents a monovalent hydrocarbon group having from 1 to 6 inclusive carbon atoms and free of aliphatic unsaturation, an alkoxy group having from 1 to 4 carbon atoms or an alkoxyalkoxy group having from 2 to 6 carbon atoms and c is 0, 1 or 3, any remaining units having the general formula ##STR27## wherein Q' is as defined for R" and d has a value of 0, 1, 2 or 3, at least 50 percent of the total Q and Q' groups being methyl, and (C) photoinitiator and thereafter exposing the coating to ultra-violet radiation.
Claim 9
Dependent Claim
269 words
A process for treating a substrate which comprises applying to a substrate a coating of a curable organosiloxane composition comprising (A) an organosiloxane having in the molecule at least two siloxane units of the general formula ##STR24## wherein R represents a divalent saturated aliphatic hydrocarbon group having from 3 to 8 inclusive carbon atoms, R' represents a monovalent hydrocarbon group having from 1 to 6 inclusive carbon atoms and free of aliphatic unsaturation, an alkoxy group having from 1 to 4 carbon atoms or an alkoxyalkoxy group having from 2 to 6 carbon atoms and a has a value of 0, 1 or 2, any remaining units having the general formula ##STR25## wherein R" represents a monovalent hydrocarbon group having from 1 to 6 carbon atoms and free of aliphatic unsaturation and b has a value of 0, 1, 2 or 3 at least 50 percent of the total R' and R" groups being methyl, (B) an organosiloxane having in the molecule at least two units of the general formula ##STR26## wherein Q represents a monovalent hydrocarbon group having from 1 to 6 inclusive carbon atoms and free of aliphatic unsaturation, an alkoxy group having from 1 to 4 carbon atoms or an alkoxyalkoxy group having from 2 to 6 carbon atoms and c is 0, 1 or 3, any remaining units having the general formula ##STR27## wherein Q' is as defined for R" and d has a value of 0, 1, 2 or 3, at least 50 percent of the total Q and Q' groups being methyl, and (C) photoinitiator and thereafter exposing the coating to ultra-violet radiation.
Claim 10
Dependent Claim
61 words
A process according to claim 7 wherein the organosiloxane (A) is a copolymer containing units of formulae (i) and (ii) in which the substituent R comprises --(CH 2 ) 3 --, CH 2 CH(CH 3 )CH 2 --(CH 2 ) 4 -- or --(CH 2 ) 6 -- and at least 50% of the R' and R" substituents are methyl groups.
Claim 11
Dependent Claim
23 words
A process according to claim 7 wherein the polysiloxane (A) has from 5 to 20% siloxane groups according to the general formula (i).
Claim 12
Dependent Claim
43 words
A process according to claim 7 wherein the organosiloxane (B) is according to the average general formula ##STR28## wherein x denotes the cyclohexenylethyl group, n has a value from about 5 to about 20 and m has a value greater than about 140.
Claim 13
Dependent Claim
24 words
A process according to claim 10 wherein each Q' represents the methyl group and m has a value from about 140 to about 500.
Claim 14
Dependent Claim
31 words
A process according to claim 7 wherein the organosiloxanes (A) and (B) are used in amounts to provide a ratio of --SH groups to --C═C-- groups of the order of 2:1.
Claim 15
Dependent Claim
12 words
A substrate having a coating formed by the method of claim 7.
Claim 16
Dependent Claim
17 words
A substrate comprising a paper substrate having a release coating formed by the method of claim 7.
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) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |