US5169727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone-based pressure-sensitive adhesives having high solids content
Assignee: 3M Co
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Filing: 1990-04-05
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Granted: 1992-12-08
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Expires: 2010-04-05
Abstract
Abstract Pressure-sensitive adhesive composition comprising (a) a benzene soluble, resinous copolymer, (b) a diorganoalkenylsiloxy endblocked polydiorganosiloxane, (c) a diorganohydrogensiloxy endblocked polydiorganosiloxane, (d) an organosiloxane crosslinking agent containing more than two groups that will react with a silicon-bonded hydrogen of a diorganohydrogensiloxy endblocked polydiorganosiloxane by means of a hydrosilation reaction, said organosilicon compound being selected from organosiloxanes having 1 to 15 silicon atoms, and (e) a hydrosilation catalyst in an amount sufficient to effect curing of the composition. The major advantage of the present invention is that solvent need not be used to apply the composition. This non-use of solvent results in savings of material, time, and energy, and reduction in health and safety hazards.
Inventors
- 👤 Larry D. Boardman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:11
CPC Classifications
C; C09; C09J; C09J183/00; C09J183/04; C08; C08L; C08L83/00; C08L2666/00; C08L2666/28; C08L2666/44; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
142 words
A composition capable of being cured to form a pressure-sensitive adhesive comprising a flowable mixture of: (a) 50 to 65 parts by weight of a benzene soluble, resinous copolymer having triorganosiloxy and SiO 4/2 units, (b) a diorganoalkenylsiloxy endblocked polydiorganosiloxane having up to 502 silicon atoms, (c) a diorganohydrogensiloxy endblocked polydiorganosiloxane having up to 502 silicon atoms, (d) an organosilicon crosslinking agent containing more than two groups that will react with a silicon-bonded hydrogen of a diorganohydrogensiloxy endblocked polydiorganosiloxane by means of a hydrosilation reaction, said organosilicon crosslinking agent having 1 to 15 silicon atoms, the sum of parts by weight of said (b) diorganoalkenylsiloxy endblocked polydiorganosiloxane plus said (c) diorganohydrogensiloxy endblocked polydiorganosiloxane plus said (d) organosilicon crosslinking agent being 50 to 35 parts by weight, and (e) a hydrosilation catalyst in an amount sufficient to effect the curing of said composition.
Claim 2
Dependent Claim
142 words
A composition capable of being cured to form a pressure-sensitive adhesive comprising a flowable mixture of: (a) 50 to 65 parts by weight of a benzene soluble, resinous copolymer having triorganosiloxy and SiO 4/2 units, (b) a diorganoalkenylsiloxy endblocked polydiorganosiloxane having up to 502 silicon atoms, (c) a diorganohydrogensiloxy endblocked polydiorganosiloxane having up to 502 silicon atoms, (d) an organosilicon crosslinking agent containing more than two groups that will react with a silicon-bonded hydrogen of a diorganohydrogensiloxy endblocked polydiorganosiloxane by means of a hydrosilation reaction, said organosilicon crosslinking agent having 1 to 15 silicon atoms, the sum of parts by weight of said (b) diorganoalkenylsiloxy endblocked polydiorganosiloxane plus said (c) diorganohydrogensiloxy endblocked polydiorganosiloxane plus said (d) organosilicon crosslinking agent being 50 to 35 parts by weight, and (e) a hydrosilation catalyst in an amount sufficient to effect the curing of said composition.
Claim 3
Dependent Claim
84 words
The composition of claim 1, comprising 50 to 65 parts by weight of component (a) and 50 to 35 parts by weight of components (b) plus (c) plus (d), the ratio of the total number of alkenyl groups present in component (b) and groups in component (d) that will react with a silicon-bonded hydrogen of a diorganohydrogensiloxy endblocked polydiorganosiloxane by means of a hydrosilation reaction to the total number of silicon-bonded hydrogen atoms present in component (c) ranging from about 0.8 to about 1.2.
Claim 4
Dependent Claim
119 words
The composition of claim 1, wherein the benzene soluble, resinous copolymer having triorganosiloxy and SiO 4/2 units consists of R 1 R 2 R 3 SiO 1/2 units and SiO 4/2 units wherein R 1 , R 2 , and R 3 independently represent monovalent hydrocarbyl radicals, there being from 0.6 to 1.0 R 1 R 2 R 3 SiO 1/2 for every SiO 4/2 unit, at least 95% of all R 1 , R 2 , and R 3 radicals being methyl and the total number of R 1 , R 2 , and R 3 radicals that have olefinic unsaturation being no more than 0.5% of all R 1 , R 2 , and R 3 radicals.
Claim 5
Dependent Claim
22 words
The composition of claim 3 wherein R 1 , R 2 , and R 3 contain no more than eighteen carbon atoms.
Claim 6
Dependent Claim
74 words
The composition of claim 1, wherein the diorganoalkenylsiloxy endblocked polydiorganosiloxane has the average formula: ##STR4## wherein each R 4 independently represents a monovalent group selected from the group consisting of alkyl groups and aryl groups, with at least 70% of the R 4 groups being methyl, x represents zero or a number having a value up to about 500, and each n independently represents zero or a number having a value up to 16.
Claim 7
Dependent Claim
18 words
The composition of claim 5, wherein x represents a number having a value of from 15 to 50.
Claim 8
Dependent Claim
31 words
The composition of claim 5, wherein each R 4 independently represents a monovalent group selected from the group consisting of alkyl groups having 1 to 18 carbon atoms and phenyl groups.
Claim 9
Dependent Claim
60 words
The composition of claim 1, wherein the diorganohydrogensiloxy endblocked polydiorganosiloxane has the average formula: ##STR5## wherein each R 5 independently represents a monovalent group selected from the group consisting of alkyl groups and aryl groups, with at least 70% of the R 5 groups being methyl, and y represents zero or a number having a value up to about 500.
Claim 10
Dependent Claim
18 words
The composition of claim 8, wherein y represents a number having a value of from 15 to 50.
Claim 11
Dependent Claim
31 words
The composition of claim 8, wherein each R 5 independently represents a monovalent group selected from the group consisting of alkyl groups having 1 to 18 carbon atoms and phenyl groups.
Claim 12
Dependent Claim
105 words
The composition of claim 1, wherein the organosilicon crosslinking agent is selected from the group consisting of: ##STR6## wherein each R 6 independently represents a monovalent saturated hydrocarbyl group selected from the group consisting of alkyl groups, aryl groups, and groups reactive in a hydrosilation reaction with a silicon-bonded hydrogen atom, q represents a number from 0 to 4, m represents a number form 0 to 14, and p represents a number form 3 to 6, with the proviso that the number of groups reactive in a hydrosilation reaction with a silicon-bonded hydrogen atom is a number greater than 2 but not greater than 15.
Claim 13
Dependent Claim
42 words
The composition of claim 11, wherein each R 6 independently represents a monovalent group selected from the group consisting of alkyl groups having 1 to 18 carbon atoms, phenyl groups, and groups reactive in a hydrosilation reaction with a silicon-bonded hydrogen atom.
Claim 14
Dependent Claim
17 words
The composition of claim 11, wherein at least three of said R 6 represents a vinyl group.
Claim 15
Dependent Claim
20 words
The composition of claim 1, further including up to 5% by weight of solvent, based on weight of the composition.
Claim 16
Dependent Claim
17 words
A pressure-sensitive adhesive article comprising a substrate bearing a layer of the cured composition of claim 1.
Claim 17
Dependent Claim
12 words
The pressure-sensitive adhesive article of claim 15, wherein the substrate is flexible.
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FR2413439A1
Cited
EP0158459A1
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EP0175355A2
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |