US4847120A
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US
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Compositions and processes producing scratch resistant polysiloxane coatings
Assignee: Cogent Ltd
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Filing: 1988-11-07
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Granted: 1989-07-11
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Expires: 2008-11-07
Abstract
Abstract A prepolymer composition for forming a scratch-resistant coating, comprising an acidic, aqueous solution of a polysiloxane prepolymer having non-coreactive side groups and co-reactive side groups other than hydrolysable groups, the composition being curable by evaporation of solvent and a decrease in acidity causing the co-reactive groups to react together to cross-link the polymer. Suitable co-reactive side groups are amino, epoxy and thiol. Suitable non-coreactive side groups are alkyl and gamma methacryloxy propyl. Acidity is suitably achieved by using a volatilisable organic acid such as acetic acid, so that it evaporates with the solvents to decrease the acidity.
Inventors
- 👤 John A. G. Gent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:36
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; C09D183/08; C09D183/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31652; Y10T428/31663; Y10T428/31667; Y10T428/31786
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
337 words
A process for producing in aqueous acidic solution a polysiloxane prepolymer comprising: (a) reacting, in aqueous acid solution, at least one first silane or oligomer thereof and at least one second silane or oligomer thereof to cause the formation of a siloxane reaction product, each of said first and second silanes or oligomers thereof having siloxane linkage-forming groups, the first silane or oligomer thereof having a non-coreactive side group attached to a silicon atom thereof and only said second silane or oligomer thereof having a first coreactive side group other than a siloxane linkage-forming group, said first coreactive side group being attached to a silicon atom thereof, said siloxane reaction product having siloxane linkage-forming groups and having siloxane linkage formed through said siloxane linkage-forming groups of said first and second silanes or oligomers thereof, having said non-coreactive side group attached to a silicon atom thereof, and having said first coreactive side group attached to a different silicon atom thereof; and (b) reacting, in aqueous acidic solution, said siloxane reaction product and a third silane or oligomer thereof to form said polysiloxane prepolymer in aqueous acidic solution, said third silane or oligomer thereof having siloxane linkage-forming groups and having a second coreactive side group other than a siloxane linkage-forming group, said second coreactive side group being capable of cross-linking reaction with said first coreactive side group, said reaction with said third silane or oligomer thereof to form said polysiloxane prepolymer being effected such that there is no substantial interaction between said first and second coreactive groups, said polysiloxane prepolymer having siloxane linkage-forming groups, having said non-coreactive side group attached to a silicon atom thereof, having said first coreactive side group attached to a different silicon atom thereof, and having said second coreactive group attached to a still different silicon atom thereof, said prepolymer being curable on removal of solvent and an increase in pH of said aqueous solution to an extent sufficient to form further siloxane linkages and to cause said first and second coreactive groups to coreact.
Claim 2
Dependent Claim
337 words
A process for producing in aqueous acidic solution a polysiloxane prepolymer comprising: (a) reacting, in aqueous acid solution, at least one first silane or oligomer thereof and at least one second silane or oligomer thereof to cause the formation of a siloxane reaction product, each of said first and second silanes or oligomers thereof having siloxane linkage-forming groups, the first silane or oligomer thereof having a non-coreactive side group attached to a silicon atom thereof and only said second silane or oligomer thereof having a first coreactive side group other than a siloxane linkage-forming group, said first coreactive side group being attached to a silicon atom thereof, said siloxane reaction product having siloxane linkage-forming groups and having siloxane linkage formed through said siloxane linkage-forming groups of said first and second silanes or oligomers thereof, having said non-coreactive side group attached to a silicon atom thereof, and having said first coreactive side group attached to a different silicon atom thereof; and (b) reacting, in aqueous acidic solution, said siloxane reaction product and a third silane or oligomer thereof to form said polysiloxane prepolymer in aqueous acidic solution, said third silane or oligomer thereof having siloxane linkage-forming groups and having a second coreactive side group other than a siloxane linkage-forming group, said second coreactive side group being capable of cross-linking reaction with said first coreactive side group, said reaction with said third silane or oligomer thereof to form said polysiloxane prepolymer being effected such that there is no substantial interaction between said first and second coreactive groups, said polysiloxane prepolymer having siloxane linkage-forming groups, having said non-coreactive side group attached to a silicon atom thereof, having said first coreactive side group attached to a different silicon atom thereof, and having said second coreactive group attached to a still different silicon atom thereof, said prepolymer being curable on removal of solvent and an increase in pH of said aqueous solution to an extent sufficient to form further siloxane linkages and to cause said first and second coreactive groups to coreact.
Claim 3
Dependent Claim
24 words
A process according to claim 1 further comprising adding acid to said aqueous acidic solution containing said polysiloxane prepolymer to stabilize said polysiloxane prepolymer.
Claim 4
Dependent Claim
15 words
A process according to claim 1 wherein said aqueous acidic solution contains a volatilisable alcohol.
Claim 5
Dependent Claim
16 words
A process according to claim 1 wherein said aqueous acidic solution contains a lower alkanoic acid.
Claim 6
Dependent Claim
16 words
A process according to claim 1 wherein said aqueous acidic solution contains a volatilisable organic acid.
Claim 7
Dependent Claim
17 words
A process according to claim 1 wherein said non-coreactive side group is selected from alkyl or aryl.
Claim 8
Dependent Claim
14 words
A process according to claim 1 wherein said non-coreactive side group comprises gamma methacryloxypropyl.
Claim 9
Dependent Claim
34 words
A process according to claim 1 wherein one of said first and second coreactive groups comprises an epoxy group and wherein the other of said first and second coreactive groups comprises an amino group.
Claim 10
Dependent Claim
37 words
A process according to claim 1 wherein one of said first and second coreactive groups comprises a thiol group and the other of said first and second coreactive groups comprises an epoxy, vinyl, acrylic, or methacrylic group.
Claim 11
Dependent Claim
33 words
A process according to claim 1 wherein at least one of said first and second coreactive groups is connected to a silicon atom through a single bond allowing rotation of the coreactive group.
Claim 12
Dependent Claim
33 words
A process according to claim 10 wherein said bond is in a connecting group which is --(CH 2 ) n -- or --(CH 2 ) n --O--, wherein n is 1 to 3.
Claim 13
Dependent Claim
37 words
A process according to claim 1 wherein said non-coreactive groups are present in an amount of at least 20 mole % based on the total amount of said first and second coreactive groups and said non-coreactive groups.
Claim 14
Dependent Claim
37 words
A process according to claim 1 wherein the non-coreactive groups are present in an amount of at least 40 mole % based on the total amount of said non-coreactive groups and said first and second coreactive groups.
Claim 15
Dependent Claim
38 words
A process according to claim 1 wherein one of said first and second coreactive groups is amino, and wherein said amino group is present in stoichiometric excess relative to the other of said first and second coreactive groups.
Claim 16
Dependent Claim
141 words
A prepolymer composition for forming a scratch-resistant coating, said composition comprising an acidic solution of a polysiloxane prepolymer in solvent, said polysiloxane prepolymer having siloxane linkages, having siloxane linkage-forming groups, and having a non-coreactive side group attached to a silicon atom of said prepolymer, a first coreactive side group other than a siloxane linkage-forming group attached to a different silicon atom of said prepolymer, and a second coreactive side group other than a siloxane linkage-forming group, said second coreactive side group being attached to a still different silicon atom of said prepolymer and being capable of cross-linking reaction with said first coreactive side group, said composition being curable by removal of solvent and a decrease in acidity of said acidic solution to an extent sufficient to form further siloxane linkages and to cause said first and second coreactive groups to coreact.
Claim 17
Dependent Claim
141 words
A prepolymer composition for forming a scratch-resistant coating, said composition comprising an acidic solution of a polysiloxane prepolymer in solvent, said polysiloxane prepolymer having siloxane linkages, having siloxane linkage-forming groups, and having a non-coreactive side group attached to a silicon atom of said prepolymer, a first coreactive side group other than a siloxane linkage-forming group attached to a different silicon atom of said prepolymer, and a second coreactive side group other than a siloxane linkage-forming group, said second coreactive side group being attached to a still different silicon atom of said prepolymer and being capable of cross-linking reaction with said first coreactive side group, said composition being curable by removal of solvent and a decrease in acidity of said acidic solution to an extent sufficient to form further siloxane linkages and to cause said first and second coreactive groups to coreact.
Claim 18
Dependent Claim
17 words
A prepolymer composition according to claim 15 wherein said non-coreactive side group selected from alkyl or aryl.
Claim 19
Dependent Claim
15 words
A prepolymer composition according to claim 15 wherein said non-coreactive side group comprises gamma methacryloxypropyl.
Claim 20
Dependent Claim
35 words
A prepolymer composition according to claim 15 wherein one of said first and second coreactive groups comprises an epoxy group and wherein the other of said first and second coreactive groups comprises an amino group.
Claim 21
Dependent Claim
38 words
A prepolymer composition according to claim 15 wherein one of said first and second coreactive groups comprises a thiol group and the other of said first and second coreactive groups comprises an epoxy, vinyl, acrylic, or methacrylic group.
Claim 22
Dependent Claim
34 words
A prepolymer composition according to claim 15 wherein at least one of said first and second coreactive groups is connected to a silicon atom through a single bond allowing rotation of the coreactive group.
Claim 23
Dependent Claim
34 words
A prepolymer composition according to claim 20 wherein said bond is in a connecting group which is --(CH 2 ) n -- or --(CH 2 ) n --O--, wherein n is 1 to 3.
Claim 24
Dependent Claim
38 words
A prepolymer composition according to claim 15 wherein said non-coreactive groups are present in an amount of at least 20 mole % based on the total amount of said first and second coreactive groups and said non-coreactive groups.
Claim 25
Dependent Claim
38 words
A prepolymer composition according to claim 15 wherein the non-coreactive groups are present in an amount of at least 40 mole % based on the total amount of said non-coreactive groups and said first and second coreactive groups.
Claim 26
Dependent Claim
16 words
A prepolymer composition according to claim 15 wherein said solvent comprises water and a volatilisable alcohol.
Claim 27
Dependent Claim
16 words
A prepolymer composition according to claim 24 wherein said acidic solution contains a lower alkanoic acid.
Claim 28
Dependent Claim
16 words
A prepolymer composition according to claim 24 wherein said acidic solution contains a volatilisable organic acid.
Claim 29
Independent Claim
136 words
A method of forming a scratch-resistant coating which comprises: coating on a substrate an acidic solution comprising a polysiloxane prepolymer in solvent, said polysiloxane prepolymer having siloxane linkages, having siloxane linkage-forming groups and having a non-coreactive side group attached to a silicon atom thereof, having a first coreactive side group other than a siloxane linkage-forming group attached to a different silicon atom thereof, and having a second coreactive side group other than a siloxane linkage-forming group attached to a still different silicon atom thereof, said second coreactive side group being capable of cross-linking reaction with said first coreactive side group; and curing said coating by removing solvent from said coating and by decreasing the acidity of said solution sufficiently to cause said first and second coreactive groups to undergo said cross-linking reaction to cure said coating.
Claim 30
Independent Claim
136 words
A method of forming a scratch-resistant coating which comprises: coating on a substrate an acidic solution comprising a polysiloxane prepolymer in solvent, said polysiloxane prepolymer having siloxane linkages, having siloxane linkage-forming groups and having a non-coreactive side group attached to a silicon atom thereof, having a first coreactive side group other than a siloxane linkage-forming group attached to a different silicon atom thereof, and having a second coreactive side group other than a siloxane linkage-forming group attached to a still different silicon atom thereof, said second coreactive side group being capable of cross-linking reaction with said first coreactive side group; and curing said coating by removing solvent from said coating and by decreasing the acidity of said solution sufficiently to cause said first and second coreactive groups to undergo said cross-linking reaction to cure said coating.
Claim 31
Dependent Claim
29 words
A method according to claim 27 wherein said solvent contains a volatilisable acid and wherein removing said solvent comprises evaporating said solvent to cause evaporation of said volatilisable acid.
Claim 32
Dependent Claim
15 words
A method according to claim 28 wherein said volatilisable acid comprises a lower alkanoic acid.
Claim 33
Dependent Claim
15 words
A method according to claim 27 wherein said solvent comprises water and a volatilisable alcohol.
Claim 34
Dependent Claim
17 words
A method according to claim 27 wherein said non-coreactive side group is selected from alkyl or aryl.
Claim 35
Dependent Claim
14 words
A method according to claim 27 wherein said non-coreactive side group comprises gamma methacryloxypropyl.
Claim 36
Dependent Claim
34 words
A method according to claim 27 wherein one of said first and second coreactive groups comprises an epoxy group and wherein the other of said first and second coreactive groups comprises an amino group.
Claim 37
Dependent Claim
37 words
A method according to claim 27 wherein one of said first and second coreactive groups comprises a thiol group and the other of said first and second coreactive groups comprises an epoxy, vinyl, acrylic, or methacrylic group.
Claim 38
Dependent Claim
33 words
A method according to claim 27 wherein at least one of said first and second coreactive groups is connected to a silicon atom through a single bond allowing rotation of the coreactive group.
Claim 39
Dependent Claim
33 words
A method according to claim 35 wherein said bond is in a connecting group which is --(CH 2 ) n -- or --(CH 2 ) n --O--, wherein n is 1 to 3.
Claim 40
Dependent Claim
37 words
A method according to claim 27 wherein said non-coreactive groups are present in an amount of at least 20 mole % based on the total amount of said first and second coreactive groups and said non-coreactive groups.
Claim 41
Dependent Claim
37 words
A method according to claim 27 wherein the non-coreactive groups are present in an amount of at least 40 mole % based on the total amount of said non-coreactive groups and said first and second coreactive groups.
Claim 42
Dependent Claim
39 words
A method according to claim 27 wherein one of the said first and second coreactive groups is amino, and wherein said amino group is present in stoichiometric excess relative to the other of said first and second coreactive groups.
Claim 43
Dependent Claim
28 words
A method according to claim 27 wherein said non-coreactive group and said first and second coreactive groups are each attached to different silicon atoms of said polysiloxane prepolymer.
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) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |