US4052529A
Expired / Lapsed
US
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Radiation-curable mercaptoalkyl vinyl polydiorganosiloxanes, method of coating there with and coated article
Assignee: Dow Silicones Corp
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Filing: 1976-03-03
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Granted: 1977-10-04
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Expires: 1996-03-03
Abstract
Abstract Certain polydiorganosiloxane compositions bearing mercaptoalkyl radicals and vinyl radicals are disclosed which cure in the presence of radiation such as ultraviolet light. The compositions consist essentially of a mixture of a triorganosiloxane-endblocked polydiorganosiloxane fluid in which from 1 to 5 percent of the organic radicals are mercaptoalkyl radicals and a methylvinylpolysiloxane. The compositions may be applied to a substrate such as paper and exposed to radiation to prepare a coated substrate that provides premium release of aggressive acrylic adhesives.
Inventors
- 👤 Gary N. Bokerman
- 👤 Joseph A. Colquhoun
- 👤 David J. Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:33
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/59; C; C08; C08L; C08L83/00; C08L83/04; C08L83/08; C09; C09J; C09J7/00; C09J7/40; C09J7/401; C09J2301/00; C09J2301/40; C09J2301/416; C09J2400/00; C09J2400/20; C09J2400/22; C09J2400/226; C09J2400/28; C09J2400/283; C09J2483/00; C09J2483/005; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
129 words
A radiation-curable polydiorganosiloxane composition consisting essentially of a mixture of A. a triorganosiloxane-endblocked polydiorganosiloxane fluid having a viscosity of at least 0.5 pascal-seconds at 25° C., wherein from 50 to 99 percent of all organic radicals are methyl, from 1 to 5 percent of all organic radicals are mercaptoalkyl having the formula --(CH 2 ) n SH, wherein n has a value of from 1 to 4 inclusive, any remaining organic radicals in (A) being alkyl radicals having from 2 to 6, inclusive, carbon atoms or phenyl, and B. a methylvinylpolysiloxane, compatible with (A) and having an average of at least three vinyl groups per molecule, the amount of (B) being sufficient to provide from 0.2 to 1.0 silicon-bonded vinyl radicals for every silicon-bonded mercaptoalkyl radical in the composition.
Claim 2
Dependent Claim
129 words
A radiation-curable polydiorganosiloxane composition consisting essentially of a mixture of A. a triorganosiloxane-endblocked polydiorganosiloxane fluid having a viscosity of at least 0.5 pascal-seconds at 25° C., wherein from 50 to 99 percent of all organic radicals are methyl, from 1 to 5 percent of all organic radicals are mercaptoalkyl having the formula --(CH 2 ) n SH, wherein n has a value of from 1 to 4 inclusive, any remaining organic radicals in (A) being alkyl radicals having from 2 to 6, inclusive, carbon atoms or phenyl, and B. a methylvinylpolysiloxane, compatible with (A) and having an average of at least three vinyl groups per molecule, the amount of (B) being sufficient to provide from 0.2 to 1.0 silicon-bonded vinyl radicals for every silicon-bonded mercaptoalkyl radical in the composition.
Claim 3
Dependent Claim
35 words
The composition of claim 1 wherein n has a value of 3 and the methylvinylpolysiloxane has the formula {CH 3 (CH 2 =CH)SiO} z wherein z has a value of from 3 to 10 inclusive.
Claim 4
Dependent Claim
39 words
The composition of claim 2 wherein the triorganosiloxane-endblocked polydiorganosiloxane consists essentially (CH 3 ) 3 SiO 1/2 siloxane units, (CH 3 ) 2 SiO siloxane units and CH 3 (HSCH 2 CH 2 CH 2 ) SiO siloxane units.
Claim 5
Dependent Claim
14 words
The composition of claim 3 further containing an effective amount of a photosensitizing compund.
Claim 6
Independent Claim
185 words
A method of treating a solid substrate to improve the release of adhesive materials therefrom, said method comprising I. applying to the solid substrate a composition obtained by mixing components consisting essentially of A. a triorganosiloxane-endblocked polydiorganosiloxane fluid having a viscosity of at least 0.5 pascal-seconds at 25° C., wherein from 50 to 99 percent of all organic radicals are methyl, from 1 to 5 percent of all organic radicals are mercaptoalkyl having the formula --(CH 2 ) n SH, wherein n has a value of from 1 to 4 inclusive, any remaining organic radicals in (A) being alkyl radicals having from 2 to 6, inclusive, carbon atoms and phenyl, and B. a methylvinylpolysiloxane, compatible with (A) and having an average of at least three vinyl groups per molecule, the amount of (B) being sufficient to provide from 0.2 to 1.0 silicon-bonded vinyl radicals for every silicon-bonded mercaptoalkyl radical in the composition, Ii. exposing the applied composition to energetic radiation, and Iii. recovering an article comprising the solid substrate having adhered thereto a cured polydiorganosiloxane that will provide premium release of aggressive acrylic adhesives therefrom.
Claim 7
Independent Claim
185 words
A method of treating a solid substrate to improve the release of adhesive materials therefrom, said method comprising I. applying to the solid substrate a composition obtained by mixing components consisting essentially of A. a triorganosiloxane-endblocked polydiorganosiloxane fluid having a viscosity of at least 0.5 pascal-seconds at 25° C., wherein from 50 to 99 percent of all organic radicals are methyl, from 1 to 5 percent of all organic radicals are mercaptoalkyl having the formula --(CH 2 ) n SH, wherein n has a value of from 1 to 4 inclusive, any remaining organic radicals in (A) being alkyl radicals having from 2 to 6, inclusive, carbon atoms and phenyl, and B. a methylvinylpolysiloxane, compatible with (A) and having an average of at least three vinyl groups per molecule, the amount of (B) being sufficient to provide from 0.2 to 1.0 silicon-bonded vinyl radicals for every silicon-bonded mercaptoalkyl radical in the composition, Ii. exposing the applied composition to energetic radiation, and Iii. recovering an article comprising the solid substrate having adhered thereto a cured polydiorganosiloxane that will provide premium release of aggressive acrylic adhesives therefrom.
Claim 8
Dependent Claim
35 words
The method of claim 5 wherein the composition further consists of an effective amount of a photosensitizing compound and the applied composition is exposed to radiation having a wavelength of from 200 to 400 nanometers.
Claim 9
Dependent Claim
63 words
The method of claim 6 wherein the triorganosiloxane-endblocked polydiorganosiloxane consists essentially of (CH 3 ) 3 SiO 1/2 siloxane units, (CH 3 ) 2 SiO siloxane units and CH 3 (HSCH 2 CH 2 CH 2 )SiO siloxane units and the methylvinylpolysiloxane has the formula {CH 3 (CH 2 =Ch)SiO} z , wherein z has a value of from 3 to 10 inclusive.
Claim 10
Dependent Claim
9 words
The article produced by the method of claim 7.
Claim 11
Dependent Claim
11 words
The method of claim 7 wherein the solid substrate is paper.
Claim 12
Dependent Claim
9 words
The article obtained by the method of claim 9.
Claim 13
Dependent Claim
11 words
The method of claim 7 wherein the solid substrate is plastic.
Claim 14
Dependent Claim
9 words
The article produced by the method of claim 11.
Claim 15
Dependent Claim
9 words
The article produced by the method of claim 5.
Claim 16
Dependent Claim
11 words
The method of claim 5 wherein the solid substrate is paper.
Claim 17
Dependent Claim
9 words
The article obtained by the method of claim 14.
Claim 18
Dependent Claim
11 words
The method of claim 5 wherein the solid substrate is plastic.
Claim 19
Dependent Claim
9 words
The article produced by the method of claim 16.
Claim 20
Dependent Claim
20 words
An article comprising a solid substrate having adhered to at least a portion thereof the cured composition of claim 3.
Claim 21
Dependent Claim
11 words
The article of claim 18 wherein the solid substrate is paper.
Claim 22
Dependent Claim
11 words
The article of claim 18 wherein the solid substrate is plastic.
Claim 23
Dependent Claim
20 words
An article comprising a solid substrate having adhered to at least a portion thereof the cured composition of claim 1.
Claim 24
Dependent Claim
11 words
The article of claim 21 wherein the solid substrate is paper.
Claim 25
Dependent Claim
11 words
The article of claim 21 wherein the solid substrate is plastic.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |