Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1992-12-29
1994-11-29
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521 54, 521 56, 521134, 521146, C08J 928
Patent
active
053691334
ABSTRACT:
A method for preparing an improved porous polymer bead which comprises the following steps: introducing a mixture comprising a purified monomer, initiator and pore-forming agent into a 4-necked reactor with a suspension stabilizer and aqueous solution, suspending the mixture to provide homogeneous organic droplets at a temperature sufficiently low so as not to decompose the initiator, increasing the temperature gradually to a final reaction temperature and maintaining the temperature at the final temperature to react completely by suspension-polymerization the monomers in the individual organic droplet to provide the porous polymer bead, separating the bead, washing the bead with water, acetone and tetrahydrofuran, successively, and drying the bead, precipitating the bead in a solution mixed with monomer nd thinner to fill the pores of the porous bead with the diluted monomers, and introducing in a 4-necked reactor with a suspension stabilizer and aqueous solution, and by suspension-polymerization again, to coat the lightly cross-linked gel-type polymer on the surface of pores in the porous polymer bead, and again washing and drying the beads to provide an improved porous polymer bead.
REFERENCES:
patent: 4908392 (1990-03-01), Kusano et al.
Ihm Son-Ki
Jo Young-Do
Foelak Morton
Korea Advanced Institute of Science and Technology
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