Process for the preparation of monodispersed polymer beads
First Claim
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1. A process for the preparation of monodispersed polymer beads having a diameter of 0.5 to 50 μ
- m, wherein, in a first homogeneous stage, a seed polymer is prepared by polymerizing a monomer dissolved in at least one organic solvent, yielding a monodispersed seed, in the presence of a polymerization initiator and triphenylmethane or a compound having the formula R--X, whereinR is a saturated or unsaturated, linear or branched aliphatic radical with more than 6 carbon atoms, andX is selected from the group consisting of a hydrogen, halogen atom, a hydroxy group, a C1 -C6 alkoxy group, an amino group, a C1 -C6 alkylamino group, a di-C1 -C6 alkylamino group, a phenyl group or a phenyl group optionally substituted with a C1 -C4 alkyl group, a polyoxyethylenated hydroxy group or a sulfonic acid group;
separating the seed polymer obtained; and
wherein, in a second stage, an emulsion polymerization is carried out by polymerizing a monomer in the presence of the seed polymer, an emulsifier, a polymerization initiator and optionally a cross-linking agent, in an aqueous medium.
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Abstract
The invention concerns a process for the preparation of monodispersed polymer beads, wherein in a first stage a seed polymer is prepared in an organic solvent and in the presence of an R--X compound, separated and in a second stage an emulsion polymerization is carried out in an aqueous medium in the presence of the seed polymer. The polymer beads obtained in this manner have diameters in the range of 0.5 to 50 μm, and may be used in the immobilization of proteins and cells, as carriers of catalysts and in peptide synthesis and in chromatography.
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17 Claims
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1. A process for the preparation of monodispersed polymer beads having a diameter of 0.5 to 50 μ
- m, wherein, in a first homogeneous stage, a seed polymer is prepared by polymerizing a monomer dissolved in at least one organic solvent, yielding a monodispersed seed, in the presence of a polymerization initiator and triphenylmethane or a compound having the formula R--X, wherein
R is a saturated or unsaturated, linear or branched aliphatic radical with more than 6 carbon atoms, and X is selected from the group consisting of a hydrogen, halogen atom, a hydroxy group, a C1 -C6 alkoxy group, an amino group, a C1 -C6 alkylamino group, a di-C1 -C6 alkylamino group, a phenyl group or a phenyl group optionally substituted with a C1 -C4 alkyl group, a polyoxyethylenated hydroxy group or a sulfonic acid group; separating the seed polymer obtained; and
wherein, in a second stage, an emulsion polymerization is carried out by polymerizing a monomer in the presence of the seed polymer, an emulsifier, a polymerization initiator and optionally a cross-linking agent, in an aqueous medium. - View Dependent Claims (2, 3, 4, 15)
- m, wherein, in a first homogeneous stage, a seed polymer is prepared by polymerizing a monomer dissolved in at least one organic solvent, yielding a monodispersed seed, in the presence of a polymerization initiator and triphenylmethane or a compound having the formula R--X, wherein
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5. A process for the preparation of monodispersed polymer beads having a diameter of 0.5 to 50 μ
- m, wherein, in a first homogenous stage, a seed polymer is prepared by polymerizing a monomer dissolved in at least one alcohol, which is a solvent for the monomer, yielding a monodispersed seed, in the presence of a polymerization initiator and a compound having the formula R--X, wherein
R is a C7 -C20 alkyl radical and X is selected from the group consisting of a halogen atom, a phenyl group or a phenyl group optionally substituted with a C1 -C4 alkyl group; separating the seed polymer obtained; and
wherein, in a second stage, an emulsion polymerization is carried out by polymerizing a monomer in the presence of the seed polymer, an emulsifier, a polymerization initiator and a cross-linking agent, in an aqueous medium and wherein, in said second stage, an inert, nonpolymerizing compound is added and subsequently removed after polymerization. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 16)
- m, wherein, in a first homogenous stage, a seed polymer is prepared by polymerizing a monomer dissolved in at least one alcohol, which is a solvent for the monomer, yielding a monodispersed seed, in the presence of a polymerization initiator and a compound having the formula R--X, wherein
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13. A process for the preparation of monodispersed polymer beads having a diameter of 0.5 to 50 μ
- m, wherein, in a first homogenous stage, a seed polymer is prepared by polymerizing a monomer dissolved in at least one alcohol, which is a solvent for the monomer, yielding a monodispersed seed, in the presence of a polymerization initiator and a compound having the formula R--X, wherein
R is a C7 -C20 alkyl radical and X is selected from the group consisting of a halogen atom, a phenyl group or a phenyl group optionally substituted with a C1 -C4 alkyl group; separating the seed polymer obtained; and
wherein, in a second stage, an emulsion polymerization is carried out by polymerizing a monomer in the presence of the seed polymer, an emulsifier, a polymerization initiator and a bifunctional monomer cross-linking agent, in an aqueous medium and wherein, in said second stage, an inert, nonpolymerizing compound is added and subsequently removed after polymerization. - View Dependent Claims (14, 17)
- m, wherein, in a first homogenous stage, a seed polymer is prepared by polymerizing a monomer dissolved in at least one alcohol, which is a solvent for the monomer, yielding a monodispersed seed, in the presence of a polymerization initiator and a compound having the formula R--X, wherein
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