Silicone pressure sensitive adhesives
First Claim
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1. A method of making an article of manufacture comprising:
- (I) applying a silicone pressure sensitive adhesive composition to at least one surface of a substrate, wherein the silicone pressure sensitive adhesive composition is obtained by a method comprising;
(i) heating a mixture comprising;
(A)(i) a hydroxyl-terminated polydiorganosiloxane having a viscosity of from 100 to 10,000,000 mm2 /s at 25°
C. or(ii) a mixture of (a) a hydroxyl-terminated polydiorganosiloxane and (b) a polydiorganosiloxane selected from (i) polydiorganosiloxanes terminated with monovalent hydrocarbon radicals free of aliphatic unsaturation or (ii) alkenyl-terminated polydiorganosiloxanes wherein said mixture has a viscosity of from 100 to 10,000,000 mm2/ s at 25°
C.;
(B) a soluble silicone resin comprising R3 SiO1/2 siloxane units and SiO4/2 units, wherein R is selected from a monovalent hydrocarbon or halohydrocarbon radical free of aliphatic unsaturation and having from 1 to 20 carbon atoms, an alkenyl radical, or a hydroxyl radical; and
(C) an organic amine compound selected from the group consisting of primary amines, secondary amines, and tertiary amines, or a metal salt of an organic amine compound selected from the group consisting of carboxylic acid salts of organic amines and quaternary ammonium salts to form a reaction product having a solids content of at least 70% and a viscosity of up to 200,000 millipascal-seconds at 25°
; and
(ii) adding (D) an organic peroxide or azo compound to the reaction product of (i); and
(II) heating the silicone pressure sensitive adhesive composition and the substrate to cure the composition.
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Abstract
The present invention relates to pressure sensitive adhesive compositions which are prepared by heating a mixture of a polydiorganosiloxane, a silicone resin copolymer, and an organic amine compound or metal salt thereof, and then adding an organic peroxide or azo compound to the resultant reaction product. The silicone pressure sensitive adhesives of this invention are useful in preparing articles such as pressure sensitive tapes, labels, emblems and other decorative or informational signs.
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Citations
20 Claims
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1. A method of making an article of manufacture comprising:
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(I) applying a silicone pressure sensitive adhesive composition to at least one surface of a substrate, wherein the silicone pressure sensitive adhesive composition is obtained by a method comprising; (i) heating a mixture comprising; (A)(i) a hydroxyl-terminated polydiorganosiloxane having a viscosity of from 100 to 10,000,000 mm2 /s at 25°
C. or(ii) a mixture of (a) a hydroxyl-terminated polydiorganosiloxane and (b) a polydiorganosiloxane selected from (i) polydiorganosiloxanes terminated with monovalent hydrocarbon radicals free of aliphatic unsaturation or (ii) alkenyl-terminated polydiorganosiloxanes wherein said mixture has a viscosity of from 100 to 10,000,000 mm2/ s at 25°
C.;(B) a soluble silicone resin comprising R3 SiO1/2 siloxane units and SiO4/2 units, wherein R is selected from a monovalent hydrocarbon or halohydrocarbon radical free of aliphatic unsaturation and having from 1 to 20 carbon atoms, an alkenyl radical, or a hydroxyl radical; and (C) an organic amine compound selected from the group consisting of primary amines, secondary amines, and tertiary amines, or a metal salt of an organic amine compound selected from the group consisting of carboxylic acid salts of organic amines and quaternary ammonium salts to form a reaction product having a solids content of at least 70% and a viscosity of up to 200,000 millipascal-seconds at 25°
; and(ii) adding (D) an organic peroxide or azo compound to the reaction product of (i); and (II) heating the silicone pressure sensitive adhesive composition and the substrate to cure the composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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8. A method according to claim 7, wherein R1 is selected from methyl, phenyl, or vinyl.
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9. A method according to claim 1, wherein the hydroxyl-terminated polydiorganosiloxane is selected from a polydiorganosiloxane having its formula selected from
HOMe2 SiO(Me2 SiO)a SiMe2 OH, HOMe2 SiO(Me2 SiO)0.94a (Ph2 SiO)0.06a SiMe2 OH, HOPh2 SiO(Me2 SiO)0.94a (Ph2 SiO)0.06a SiPh2 OH, HOMe2 SiO(Me2 SiO)0.95a (MeViSiO)0.05a SiMe2 OH, HOVi2 SiO(Me2 SiO)0.95 a(MeViSiO)0.05a SiVi2 OH, or HOR2 SiO(Me2 SiO)0.88a (Ph2 SiO)0.12a SiR2 OH wherein each R is independently selected from methyl, phenyl, or vinyl, and a has a value such that the viscosity of the polydiorganosiloxane ranges from 1,000 to 500,000 mm2 /s when measured at 25° - C.
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10. A method according to claim 1, wherein the monovalent hydrocarbon radicals free of aliphatic unsaturation are selected from methyl or phenyl.
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11. A method according to claim 1, wherein the alkenyl radical is vinyl.
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12. A method according to claim 1, wherein (b)(i) is selected from
Me3 SiO(Me2 SiO)a SiMe3, Me3 SiO(Me2 SiO)0.95a (MeViSiO)0.05a SiMe3, or Me3 SiO(Me2 SiO)0.5a (MePhSiO)0.5a SiMe3 wherein Me, Vi, and Ph denote methyl, vinyl and phenyl, respectively, and a has a value such that the viscosity of the polydiorganosiloxane ranges from 1,000 to 500,000 mm2 /s when measured at 25° - C.
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13. A method according to claim 1, wherein (b)(ii) is selected from
ViMe2 SiO(Me2 SiO)a SiMe2 Vi, ViMe2 SiO(Me2 SiO)0.95a (MePhSiO)0.05a SiMe2 Vi, ViMe2 SiO(Me2 SiO)0.98a (MeViSiO)0.02a SiMe2 Vi, PhMeViSiO(Me2 SiO)a SiPhMeVi, or PhMeViSiO(Me2 SiO)0.8a (MePhSiO)0.1a (Ph2 SiO)0.1a SiPhMeVi, wherein Me, Vi, and Ph denote methyl, vinyl and phenyl, respectively, and a has a value such that the viscosity of the polydiorganosiloxane ranges from 1,000 to 500,000 mm2 /s when measured at 25° - C.
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14. A method according to claim 1, wherein R is selected from methyl, phenyl, vinyl, or hydroxyl.
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15. A method according to claim 1, wherein the molar ratio of R3 SiO1/2 units to SiO4/2 units is from 0.5 to 1.3.
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16. A method according to claim 1, wherein (B) has a number average molecular weight of 3,000 to 7,500.
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17. A method according to claim 1, wherein (C) is selected from methylamine, ethylamine, propyl amine, hexylamine, butanolamine, butylamine, dimethylamine, diethylamine, diethanolamine, dipropylamine, dibutylamine, dihexylamine, ethylamylamine, propylhexylamine, trimethylamine, triethylamine, tripropylamine, tributylamine, trihexylamine, pyridine, methyldipropylamine, tripropanolamine, methylpropylhexylamine, diethylammonium acetate, butylammonium octoate, trimethylammonium laurate, tetramethylammonium acetate, methylethyldibutylammonium chloride, dioctadecyldimethylammonium chloride, methylimidazole, or imidazole.
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18. A method according to claim 1, wherein (D) is selected from benzoyl peroxide, dichlorobenzoyl peroxide, or azobisisobutyronitrile.
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19. A method according to claim 1, wherein the reaction product of Step (i) has a solids content of at least 75% and a viscosity of up to 150,000 millipascal-seconds at 25°
- C.
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20. A method according to claim 1, wherein the reaction product of Step (i) has a solids content of at least 80% and a viscosity of up to 100,000 millipascal-seconds at 25°
- C.
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Specification