摘要:
Disclosed is a thermoplastic elastomer composition obtained by dynamically crosslinking a composition composed of a component (A), a component (B) and a component (C) with 0.05-5 parts by mass of a crosslinking agent per 100 parts by mass of the component (A). The component (A) is 50-85 parts by mass of an acrylic rubber prepared by copolymerizing a monomer mixture mainly containing an alkyl acrylate and also containing 0.5-15% by mass of an epoxy group-containing monomer. The component (B) is 15-50 parts by mass of a thermoplastic polyester resin. The component (C) is 1-35 parts by mass of a graft copolymer or a precursor thereof per 100 parts by mass of the total of the components (A) and (B), and the graft copolymer is composed of an olefin polymer segment and a vinyl copolymer segment.
摘要:
An aqueous dispersion-type sustained release preparation which contains a functional substance inside of its IPN is prepared by: a first step of emulsion copolymerization in which monomer components which comprise the one selected from (meth)acrylic ester monomers having a photo-initiating group (component a1) and radical-polymerizing organic peroxides (component a2), and also comprise a (meth)acrylic ester monomer (component b), a polyfunctional (meth)acrylic ester monomer (component c), and optionally, a hydrophilic monomer (component d) are used as well as a functional substance, a surface active agent, a polymerization initiator and water to obtain an emulsion; and a second step of polymerization in which a (meth)acrylic ester monomer (component e) and a polyfunctional (meth)acrylic ester monomer (component f) are added to the emulsion obtained in the first step.