Hot-melt silicon pressure sensitive adhesives with phenyl-containing siloxane fluid additive and related methods and articles
First Claim
1. A hot-melt silicone pressure sensitive adhesive composition, comprising a mixture of(i) a silicone resin and(ii) a polydimethylsiloxane fluid, said mixture exhibiting tackiness and adhesiveness, said mixture being blended homogeneously with(iii) from about 0.5 to about 20 weight percent, based on the total weight of said silicone resin and said polydimethylsiloxane fluid, of polyphenylmethylsiloxane copolymer fluid, (CH3 (3 SiO[Si(C6 H5)(OSi(CH3)3)O]n Si(CH3)3, where n is selected so that the viscosity of the homogeneously blended mixture is from about 5 to about 60,000 centistokes so that the adhesive will be in a generally flowing state at temperatures above about 100°
- C., as well as being capable of transdermal drug delivery.
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Abstract
Hot-melt silicone pressure sensitive adhesive compositions, methods of using the compositions, articles made using the compositions, and methods of making articles using the compositions. The hot-melt silicone pressure sensitive adhesive compositions include a mixture of (i) a silicone resin, (ii) a polyolimethylsiloxane fluid, and (iii) from about 0.5 to about 20 weight percent, based on the total weight of the silicone resin and the polydimethylsiloxane fluid, of a polyphenylmethylsiloxane fluid having a viscosity at 25° C. of from about 5 to about 60,000 centistokes so that the adhesive will be in a generally flowing state at temperatures above about 100° C., as well as being capable of transdermal drug delivery.
98 Citations
15 Claims
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1. A hot-melt silicone pressure sensitive adhesive composition, comprising a mixture of
(i) a silicone resin and (ii) a polydimethylsiloxane fluid, said mixture exhibiting tackiness and adhesiveness, said mixture being blended homogeneously with (iii) from about 0.5 to about 20 weight percent, based on the total weight of said silicone resin and said polydimethylsiloxane fluid, of polyphenylmethylsiloxane copolymer fluid, (CH3 (3 SiO[Si(C6 H5)(OSi(CH3)3)O]n Si(CH3)3, where n is selected so that the viscosity of the homogeneously blended mixture is from about 5 to about 60,000 centistokes so that the adhesive will be in a generally flowing state at temperatures above about 100° - C., as well as being capable of transdermal drug delivery.
- View Dependent Claims (2, 3, 4, 5, 6, 15)
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7. A method of making a hot-melt silicone pressure sensitive adhesive-coated substrate, comprising:
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(a) heating, to a coatable temperature above 100°
C., a hot-melt silicone pressure sensitive adhesive composition which includes a mixture of(i) a silicone resin and (ii) a polydimethylsiloxane fluid, said mixture exhibiting tackiness and adhesiveness, said mixture being blended with (iii) from about 0.5 to about 20 weight percent, based on the total weight of said silicone resin and said polydimethylsiloxane fluid, of a phenyl-containing polysiloxane fluid having a viscosity at 24°
C. of from about 5 to about 60,000 centistokes,(b) coating said heated hot-melt polydimethylsiloxane pressure sensitive adhesive composition onto a substrate, and (c) cooling the coated hot-melt silicone pressure sensitive adhesive composition until it is in a generally non-flowing state. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification