AQUEOUS MOLD RELEASE AGENT FOR DIE-CASTING AND METHOD FOR IMPARTING MOLD RELEASABILITY TO DIE-CAST MOLDING USING THE SAME AQUEOUS MOLD RELEASE AGENT

摘要

PURPOSE: To obtain an aqueous mold release agent, comprising an aqueous emulsion of a specific polysiloxane-polyvinyl graft copolymer, excellent in mold releasability and coating properties and useful for the production, etc., of moldings. ;CONSTITUTION: This aqueous mold release agent comprises an aqueous emulsion of a polysiloxane-polyvinyl graft copolymer containing one or more siloxane units Y selected from siloxane units of formulas I and II [R¹ and R² are each a 1-3C alkyl, phenyl, etc.; A¹ is a bivalent organic group; B¹ is a vinyl (co)polymer block] and one or more siloxane units Z selected from siloxane units of formulas III to V (R³ is R¹; A² is A¹; B² is B¹) as main constituent units at (90/10) to (99.9/0.1) molar ratio (Y/Z). The total amount of the contained units of formula II and/or units of formula IV is 0.5-5mol% based on the total siloxane units and the total amount of the contained vinyl (co)polymer blocks of formulas II and IV is 25-75wt.%.;COPYRIGHT: (C)1996,JPO