EP0204427A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Organopolysiloxane materials having decreased surface tack
Assignee: Raychem Corp
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Filing: 1986-05-01
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Granted: —
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Expires: 2006-05-01
Abstract
Abstract This invention provides organopolysiloxane materials having cone penetration between about 100 and about 350 (10- 1 mm) and ultimate elongation of at least 100% and having reduced surface tack. This invention provides three methods of obtaining said materials with reduced surface tack. The first method comprises applying to the surface of such material an organic peroxide or a photoinitiator and irradiating the surface with ultraviolet light to further crosslink the surface to reduce or eliminate the tack of the surface. The second method comprises mixing a photoinitiator, such as benzophenone, in an organopolysiloxane fluid, thermally crosslinking the organopolysiloxane fluid to produce the material with the above cone penetration and ultimate elongation then irradiating the surface of the material with ultraviolet light to reduce or eliminate the tack of the surface. The third method comprises mixing a photoinitiator, such as benzophenone, in an organopolysiloxane fluid, crosslinking the fluid by irradiating a layer of the fluid with ultraviolet light to produce the above cone penetration and ultimate elongation properties then further irradiating the crosslinked material to reduce or eliminate the surface tack; this method can be carried out by simultaneous irradiation with ultraviolet light from two sides of a layer of the organopolysiloxane wherein one surface is irradiated at a higher intensity than the other surface. The materials produced by this invention are useful as tapes and sealants.
Inventors
- 👤 Robert S. Dubrow
- 👤 William David Uken
- 👤 Catherine A. Dittmer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 07:51
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/16; C08J7/18; B; B29; B29C; B29C71/00; B29C71/04; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0827; B29K; B29K2083/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
84 words
A method of reducing the surface tack of crosslinked organopolysiloxane materials having cone penetration between about 100 and about 350 (10- 1 mm) and ultimate elongation at least about 100% which comprises: applying to the surface of said material an effective amount of an organic peroxide or a photoinitiator; and irradiating the surface with ultraviolet light to effect a further crosslinking of the surface of said material to reduce the surface tack thereof without effecting significant further crosslinking of said material below said surface.
Claim 2
Independent Claim
84 words
A method of reducing the surface tack of crosslinked organopolysiloxane materials having cone penetration between about 100 and about 350 (10- 1 mm) and ultimate elongation at least about 100% which comprises: applying to the surface of said material an effective amount of an organic peroxide or a photoinitiator; and irradiating the surface with ultraviolet light to effect a further crosslinking of the surface of said material to reduce the surface tack thereof without effecting significant further crosslinking of said material below said surface.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein the organic peroxide comprises benzoyl peroxide or tert-butyl peroxy benzoate.
Claim 4
Dependent Claim
15 words
A method according to claim 1 wherein the photoinitiator comprises benzophenone or a substituted acetophenone;
Claim 5
Independent Claim
108 words
A method of producing a crosslinked organopolysiloxane material having cone penetration between about 100 and about 350 (10- 1 mm) and ultimate elongation of at least about 100% and having reduced surface tack which comprises: mixing in an organopolysiloxane fluid an effective amount of a photoinitiator; thermally crosslinking said organopolysiloxane fluid to a cone penetration between about 100 and about 350 (10- 1 mm) and an ultimate elongation of at least about 100%; and irradiating the surface with ultraviolet light to effect a further crosslinking of the surface of said material to reduce the surface tack thereof without effecting significant further crosslinking of said material below said surface.
Claim 6
Independent Claim
108 words
A method of producing a crosslinked organopolysiloxane material having cone penetration between about 100 and about 350 (10- 1 mm) and ultimate elongation of at least about 100% and having reduced surface tack which comprises: mixing in an organopolysiloxane fluid an effective amount of a photoinitiator; thermally crosslinking said organopolysiloxane fluid to a cone penetration between about 100 and about 350 (10- 1 mm) and an ultimate elongation of at least about 100%; and irradiating the surface with ultraviolet light to effect a further crosslinking of the surface of said material to reduce the surface tack thereof without effecting significant further crosslinking of said material below said surface.
Claim 7
Dependent Claim
17 words
A method according to claim 4 wherein the photoinitiator comprises benzophenone, a substituted acetophenone, anthroquinone or triphenylamine.
Claim 8
Independent Claim
118 words
A method of producing a crosslinked organopolysiloxane material having cone penetration between about 100 and 350 (10- 1 mm) and ultimate elongation of at least about 100% and having reduce surface tack which comprises: mixing in an organopolysiloxane fluid an effective amount of a photoinitiator; crosslinking said organopolysiloxane fluid to a material having cone penetration between about 100 and about 350 (10- 1 mm) and an ultimate elongation of at least about 100% by irradiating said fluid with ultraviolet light; and irradiating a surface of said material with ultraviolet light to effect a further crosslinking of the surface of said material to reduce the surface tack thereof without effecting significant further crosslinking of said material below said surface.
Claim 9
Independent Claim
118 words
A method of producing a crosslinked organopolysiloxane material having cone penetration between about 100 and 350 (10- 1 mm) and ultimate elongation of at least about 100% and having reduce surface tack which comprises: mixing in an organopolysiloxane fluid an effective amount of a photoinitiator; crosslinking said organopolysiloxane fluid to a material having cone penetration between about 100 and about 350 (10- 1 mm) and an ultimate elongation of at least about 100% by irradiating said fluid with ultraviolet light; and irradiating a surface of said material with ultraviolet light to effect a further crosslinking of the surface of said material to reduce the surface tack thereof without effecting significant further crosslinking of said material below said surface.
Claim 10
Dependent Claim
46 words
A method according to claim 6 wherein the organopolysiloxane further contains an organic peroxide in mixture therewith and wherein the crosslinking of the organopolysiloxane fluid is effected simultaneously with the crosslinking of the surface by irradiating two sides of the fluid with different intensity ultraviolet light.
Claim 11
Dependent Claim
81 words
An organopolysiloxane material having cone penetration between about 100 and about 350 (10- 1 mm) and ultimate elongation of at least 100% and having reduced surface tack formed by: applying to the surface of said material an effective amount of an organic peroxide or a photoinitiator; and irradiating the surface with ultraviolet light to effect a further crosslinking of the surface of said material to reduce the surface tack thereof without effecting significant further crosslinking of said material below said surface.
Claim 12
Dependent Claim
81 words
An organopolysiloxane material having cone penetration between about 100 and about 350 (10- 1 mm) and ultimate elongation of at least 100% and having reduced surface tack formed by: applying to the surface of said material an effective amount of an organic peroxide or a photoinitiator; and irradiating the surface with ultraviolet light to effect a further crosslinking of the surface of said material to reduce the surface tack thereof without effecting significant further crosslinking of said material below said surface.
Claim 13
Dependent Claim
102 words
An organopolysiloxane material having cone penetration between about 100 and about 350 (10- 1 mm) and ultimate elongation of at least 100% and having reduced surface tack formed by: mixing in an organopolysiloxane fluid an effective amount of a photoinitiator; thermally crosslinking said organopolysiloxane fluid to a cone penetration between about 100 and about 350 (10- l mm) and an ultimate elongation of at least about 100%; and irradiating the surface with ultraviolet light to effect a further crosslinking of the surface of said material to reduce the surface tack thereof without effecting significant further crosslinking of said material below said surface.
Claim 14
Dependent Claim
102 words
An organopolysiloxane material having cone penetration between about 100 and about 350 (10- 1 mm) and ultimate elongation of at least 100% and having reduced surface tack formed by: mixing in an organopolysiloxane fluid an effective amount of a photoinitiator; thermally crosslinking said organopolysiloxane fluid to a cone penetration between about 100 and about 350 (10- l mm) and an ultimate elongation of at least about 100%; and irradiating the surface with ultraviolet light to effect a further crosslinking of the surface of said material to reduce the surface tack thereof without effecting significant further crosslinking of said material below said surface.
Claim 15
Dependent Claim
113 words
An organopolysiloxane material having cone penetration between about 100 and about 350 (10- 1 mm) and ultimate elongation of at least 100% and having reduced surface tack formed by: mixing in an organopolysiloxane fluid an effective amount of a photoinitiator; crosslinking said organopolysiloxane fluid to a material having cone penetration between about 100 and aboug 350 (10- l mm) and an ultimate elongatio nof at least about 100% by irradiating said fluid with ultraviolet light; and irradiating the surfce of said material with ultraviolet light to effect a further crosslinking of the surface of said material to reduce the surface tack thereof without effecting significant further crosslinking of said material below said surface.
Claim 16
Dependent Claim
113 words
An organopolysiloxane material having cone penetration between about 100 and about 350 (10- 1 mm) and ultimate elongation of at least 100% and having reduced surface tack formed by: mixing in an organopolysiloxane fluid an effective amount of a photoinitiator; crosslinking said organopolysiloxane fluid to a material having cone penetration between about 100 and aboug 350 (10- l mm) and an ultimate elongatio nof at least about 100% by irradiating said fluid with ultraviolet light; and irradiating the surfce of said material with ultraviolet light to effect a further crosslinking of the surface of said material to reduce the surface tack thereof without effecting significant further crosslinking of said material below said surface.
References Cited (Backward Citations)
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