CONTAINER, METHOD AND COMPOSITION FOR CONTROLLING RELEASE OF VOLATILE LIQUID FROM WATER MIXTURE

摘要

PURPOSE: To release a liquid material to an adjacent gaseous atmosphere at an adequately high speed without accumulation on the exposed surfaces of films or coatings by forming at least one release control layers of solid materials of the films or coatings of copolymers specified in the molar ratio and thickness of specific hard segments and soft segments. CONSTITUTION: At least one walls consist of at least one release control layers composed of the materials which allow the permeation of volatile components. These layers consist of 20 to 40wt.% hard segments consisting of the polyurethane units derived from org. diisocyanate and alkylene diol and 60 to 80wt.% soft segments consisting 15 to 60wt.% hydrophobic parts consisting at least one of sequence of about 15 to about 100 dimethylsiloxane units and 10 to 65wt.% hydrophilic parts consisting at least one of sequence of 5 to 70 oxyethylene units. At this time, the layers exist as the films or coatings of 0.001 to 1mm thickness consisting of the block copolymers of nearly linear dimethyl siloxane/oxyethylene/urethane having a molar ratio of the hard segment to the soft segment of 2.5 to 7.