PRODUCTION OF POROUS CROSSLINKED COPOLYMER

• Main Author: YAMASHITA SEIICHI
• Format: Patent
• Language: English
• Published: 22.07.1991
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

PURPOSE:To obtain the subject copolymer having excellent processability and physical properties and useful as an absorbent, etc., by suspension-polymerizing a specific vinyl monomer mixture in an aqueous medium in the presence of a pore-forming agent, etc., adding a silicone resin or a mineral oil and heating the mixture to eliminate the pore-forming agent. CONSTITUTION:A monomer mixture composed of a monovinyl monomer (e.g. styrene) and a polyvinyl monomer (e.g. divinylbenzene) (the amount of the polyvinyl monomer in the whole monomer mixture is preferably 8-80wt.%) is suspension-polymerized in an aqueous medium in the presence of a pore-forming agent (e.g. benzene, etc., in an amount of preferably 25-200wt.% based on the whole monomer) and a polymerization initiator (e.g. benzoyl peroxide). A silicone resin or a mineral oil is added to the polymer in an amount of preferably 0.1-10wt.% based on the whole monomer and the system is heat-treated to remove and recover the pore-forming agent and obtain the objective polymer.