Medical tape preparation
A medical tape preparation which comprises a support and, superposed on one side thereof in the following order, a pressure-sensitive adhesive layer and a release liner. The pressure-sensitive adhesive layer can contain a large amount of an oleophilic oily matter. The tape preparation is excellent in adhesion, cohesiveness, and stability even when no crosslinking agent is used. The pressure-sensitive adhesive layer in the medical tape preparation comprises a blend of two tacky polymers, which are a tacky polymer (A) comprising a copolymer obtained from 2-acetoacetoxyethyl methacrylate and other vinyl monomer(s) as constituent ingredients and a tacky polymer (B) comprising a copolymer which is obtained from a C 4-10 -alkyl (meth)acrylate and other vinyl monomer(s) as constituent ingredients and is different from the tacky polymer (A).
1. A medical tape preparation comprising a pressure-sensitive adhesive layer and a release liner laminated in that order on one side of a support, wherein the pressure-sensitive adhesive layer comprises a pressure-sensitive adhesive that is a mixture of two different pressure-sensitive adhesives:
(A) a pressure-sensitive adhesive polymer A comprising a copolymer whose constituent components are 2-acetoacetoxyethyl methacrylate ester and one or more vinyl monomer selected from alkyl (meth)acrylate esters with C 4-10 alkyl groups, methyl methacrylate, diacetoneacrylamide, tetraethyleneglycol di(meth)acrylate, hexaethyleneglycol di(meth)acrylate, or 2-hydroxyethyl (meth)acrylate ester; and
(B) a pressure-sensitive adhesive polymer B comprising a copolymer different from pressure-sensitive adhesive polymer A, whose constituent components are an alkyl (meth)acrylate ester with a C 4-10 alkyl group and one or more vinyl monomer selected from methyl methacrylate, diacetoneacrylamide, 2-hydroxyethyl (meth)acrylate ester, N-vinyl-2-pyrrolidone, or vinyl acetate,
wherein the proportion of the pressure-sensitive adhesive polymer A as component (A) and the pressure-sensitive adhesive polymer B as component (B) is 1:9-4:1.
2. The medical tape preparation according to claim 1 , wherein the pressure-sensitive adhesive polymer A as component (A) is composed of a copolymer whose constituent components are 2-acetoacetoxyethyl methacrylate ester, 2-ethylhexyl acrylate ester, methyl methacrylate ester, diacetoneacrylamide and tetraethyleneglycol dimethacrylate.
3. The medical tape preparation according to claim 2 , wherein the pressure-sensitive adhesive polymer B as component (B) is selected from copolymers of 2-ethylhexyl methacrylate ester, butyl acrylate and methyl methacrylate with diacetoneacrylamide, copolymers of 2-ethylhexyl acrylate ester and butyl acrylate with methyl acrylate, copolymers of 2-ethylhexyl acrylate ester and 2-hydroxyethyl acrylate ester with vinyl acetate and copolymers of butyl acrylate and 2-ethylhexyl acrylate ester with diacetoneamide.
4. The medical tape preparation according to claim 3 , wherein the pressure-sensitive adhesive layer contains a plasticizer comprising an oil component that is compatible with the pressure-sensitive adhesive composed of the mixture of the pressure-sensitive adhesive polymer A as component (A) and the pressure-sensitive adhesive polymer B as component (B).
5. The medical tape preparation according to claim 1 , wherein the content of the 2-acetoacetoxyethyl methacrylate ester in pressure-sensitive adhesive polymer A is 10 wt %-45 wt % with respect to the total weight of the copolymer in pressure-sensitive adhesive polymer A.
6. The medical tape preparation according to claim 2 , wherein the content of the 2-acetoacetoxyethyl methacrylate ester in pressure-sensitive adhesive polymer A is 10 wt %-45 wt % with respect to the total weight of the copolymer in pressure-sensitive adhesive polymer A.
7. The medical tape preparation according to claim 3 , wherein the content of the 2-acetoacetoxyethyl methacrylate ester in pressure-sensitive adhesive polymer A is 10 wt %-45 wt % with respect to the total weight of the copolymer in pressure-sensitive adhesive polymer A.
8. The medical tape preparation according to claim 4 , wherein the content of the 2-acetoacetoxyethyl methacrylate ester in pressure-sensitive adhesive polymer A is 10 wt %-45 wt % with respect to the total weight of the copolymer in pressure-sensitive adhesive polymer A.
9. The medical tape preparation according to claim 8 , wherein the plasticizer is one or more oils selected from the group consisting of isopropyl myristate, diethyl sebacate, diisopropyl adipate, medium chain fatty acid triglyceride and castor oil.
10. The medical tape preparation according to claim 9 , wherein the pressure-sensitive adhesive layer contains a percutaneous absorbable drug.