Pressure-Sensitive Adhesive Composition for Low Stratum Corneum Exfoliation

The patent applies parameter changes by carefully controlling the glass transition temperature (Tg) of the polymer within -50°C to 0°C and adjusting the molecular weight to 10,000 to 1,000,000. These parameter optimizations modify the adhesive's physical properties to reduce stratum corneum exfoliation while maintaining skin adhesiveness. The specific Tg range ensures the adhesive remains flexible and compliant with skin movement without being too weak to adhere properly.

The patent uses composite materials by combining a polymer with specific constituent units (U1, U2, U3) in defined proportions. The polymer contains units derived from acrylic acid alkyl esters with specific carbon chain lengths, carboxyl group-containing monomers, and other functional monomers. This composite structure creates an adhesive that balances strong adhesion with reduced skin damage upon removal.

The patent resolves this contradiction by changing the physical parameters of the adhesive, specifically controlling the glass transition temperature to -50°C to 0°C and molecular weight to 10,000 to 1,000,000. These parameter adjustments create an adhesive that achieves sufficient bond strength through optimized molecular flexibility and intermolecular forces, rather than through excessive bonding that would cause skin damage during removal.

The patent applies dynamics by ensuring the adhesive maintains appropriate viscoelastic properties through controlled polymer composition and molecular weight. The adhesive can dynamically adapt to skin movement and deformation, allowing it to maintain strong attachment during wear while enabling cleaner removal with reduced stratum corneum exfoliation when the adhesive is peeled off.