Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1997-09-15
1999-03-23
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526258, 5263171, C08F 2010
Patent
active
058861220
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for preparing solvent-type acrylic pressure-sensitive adhesives and a medical pressure-sensitive adhesive utilizing the pressure-sensitive adhesives. More particularly, this invention relates to a method for preparing solvent-type acrylic pressure-sensitive adhesives for use in pressure-sensitive adhesive-coated products in such forms as tapes and labels, and in medical adhesive materials known as plasters and poultices; and to a medical pressure-sensitive adhesive utilizing the above solvent-type acrylic pressure-sensitive adhesives for exhibiting a marked reduction in residual monomers content which may otherwise cause irritation to human body.
DESCRIPTION OF THE PRIOR ART
Conventionally, pressure-sensitive adhesive-coated products, such as pressure-sensitive adhesive tapes and sheets, have been widely used in such applications as building materials, household electrical appliances, automotive cushioning materials, gap-filling tapes and the like. Exemplary forms of such pressure-sensitive adhesive tapes and sheets include double-coated tapes having pressure-sensitive adhesive layers provided on opposite surfaces of a substrate, foam tapes having pressure-sensitive adhesive layers provided on at least one surface of a foam substrate, commonly-used pressure-sensitive adhesive tapes having a pressure-sensitive adhesive layer provided on a single surface of a suitable substrate and the like.
In a medical field, medical adhesive materials have been widely employed which typically define a drug-containing pressure-sensitive adhesive layer on a substrate. Another type of medical adhesive materials incorporates a drug-free pressure-sensitive adhesive layer provided on at least one surface of a flexible sheet or tape substrate, such as for use as adhesive bandages and the like.
Most representative of pressure-sensitive adhesives for use in varieties of pressure-sensitive adhesive-coated products and medical adhesive materials as mentioned above are solvent-type pressure-sensitive adhesives comprised primarily of acrylic copolymers. This is because the solvent-type acrylic pressure-sensitive adhesives exhibit excellent performance characteristics including weatherability, durability, heat resistance, freeze resistance and water resistance.
The solvent-type acrylic pressure-sensitive adhesives have also come into widespread use as pressure-sensitive adhesives for constituting a pressure-sensitive adhesive layer in medical adhesive materials, since their physical properties, including a tack strength, can be readily controlled by combining various types of acrylic monomers.
The above-described, acrylic pressure-sensitive adhesives are obtainable generally by polymerizing a monomer composition containing as its main component alkyl (meth)acrylate ester through solution or emulsion polymerization, introducing additives and others to the resulting polymer solution, and thereafter removing a solvent by drying. When manufacturing medical adhesive materials, purposed drugs are added to the above-mentioned polymer solution prior to removal of the solvent by drying.
In medical practices, nitroglycerin-containing medical adhesive materials of endermic absorption type are employed as remedies or prophylactics for heart disease such as angina pectoris, myocardial infarction or heart failure. For example, Japanese Patent Laying-open No. Sho 63-246325 discloses nitroglycerin-containing adhesive materials which utilize particular alkyl (meth)acrylate ester copolymers.
It is known that endermic preparations which utilize a medical pressure-sensitive adhesive comprising a copolymer of alkyl (meth)acrylate ester and vinyl pyrrolidone, among the above-described acrylic pressure-sensitive adhesives, are capable of exhibiting effects of active ingredients in a short period after application as well as their effectiveness for a prolonged period of time (Japanese Patent publication No. Hei 3-70685).
BACKGROUND OF THE INVENTION
The widespread uses of the above-describ
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Matsumoto Mitsue
Nagano Motoi
Nakachi Takeshi
Oka Takayuki
Shinjo Takashi
Lipman Bernard
Sarofim N.
Sekisui Kagaku Kogyo Kabushiki Kaisha
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