Pressure-sensitive adhesive tape and pressure-sensitive adhesive composition for medical adhesive tape

A method for producing a pressure-sensitive adhesive composition for medical pressure-sensitive adhesive tapes, comprising:

• mixing a pressure-sensitive adhesive composition precursor containing a urethane acrylate oligomer having a carboxyl group and an ultraviolet (UV) initiator in an amount of less than 1.5% by weight based on the total amount of the adhesive compositon,
• heating said adhesive composition precursor at a temperature of 50° C. to less than 100° C. to form a coating solution having a viscosity of 2,000 to 100,000 mPa·s, and
• applying said coating solution to a substrate and thereafter, crosslinking or curing said urethane acrylate oligomer to form a base polymer having a glass transition temperature (Tg) of 0° C. or less.

A pressure-sensitive adhesive composition for medical pressure-sensitive adhesive tapes, comprising a base polymer containing a pressure-sensitive adhesive polymer obtained by crosslinking or curing a precursor containing a urethane acrylate oligomer having a carboxyl group and an ultraviolet (UV) initiator in an amount of less than 1.5% by weight based on the total amount of the adhesive composition, said base polymer having a glass transition temperature (Tg) of 0° C. or less;

• and a plasticizer.