Abstract: The present invention provides an acid resistant capsule shell composition comprising a water-soluble enteric polymer, a water-soluble film forming polymer, a coagulant, and a gelling aid. The water-soluble enteric polymer comprises hydrophobic functional groups and hydrophilic functional groups. The present invention further provides a process for preparing an acid resistant capsule shell comprising: dissolving said acid resistant capsule shell composition in deionized water to form a capsule shell solution; heating then cooling the capsule shell solution to form a capsule shell stock solution; dipping a pin into the capsule shell stock solution then removing the pin to form a film-coated pin; and drying the film-coated pin to form the acid resistant capsule shell. The acid resistant capsule shell has acidic resistance and the process for preparing the acid resistant capsule shell is without organic solvent; hence, the problem of organic solvent residues can be prevented.

Abstract: A waterproof heat-preservative film is formed by providing a melt of a waterproof material, mixing phase-change microcapsules with the melt to form a mixture, solidifying the mixture and pulverizing the solidified mixture to form particles containing phase-change microcapsules, and forming a film with the particles by means of extruding or blowing.

Abstract: A waterproof heat-preservative film is formed by providing a melt of a waterproof material, mixing phase-change microcapsules with the melt to form a mixture, solidifying the mixture and pulverizing the solidified mixture to form particles containing phase-change microcapsules, and forming a film with the particles by means of extruding or blowing.

Abstract: A method for manufacturing a temperature-maintaing material includes the steps of (1) selecting a phase-change substance, (2) processing the phase-change substance to form a liquid, (3) processing the phase-change substance with high molecule material to form microcapsules, (4) drying the microcapsules, (5) mixing the microcapsules with adhesive and hardening agent to form a mixture and (6) melting, cooling down and pulverizing the mixture for further processing to form a coating on an object or a substrate.