Process for the preparation of functionalized polymer particles
First Claim
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1. A process for the preparation of monodisperse amine-functionalised vinyl polymer particles wherein said polymer particles have a mode particle diameter of at least 20 μ
- m, which process comprises(a) obtaining a first particulate polymer seed material having a mode particle diameter of no more than 50 μ
m;
(b) using said first seed material, performing a suspension polymerisation to yield a second particulate polymer seed material having a mode particle diameter greater than that of said first seed material, and using said second seed material, performing at least one further suspension polymerisation to yield a particulate polymer seed material whereby the increase in mode particle diameter in step (b) is at least ×
2,wherein at least one of the suspension polymerisations effected in step (b) involves(i) forming an aqueous dispersion comprising a polymer seed material, a first polymerization initiator of an organic compound which has a molecular weight of less than 5000 Daltons and a water solubility of less than 10−
2 g/L at 25°
C., a hydroxyalkylmethylcellulose stabilizer and a first monomer;
(ii) allowing said organic compound to diffuse into the seed material to produce an activated seed material; and
(iii) contacting said activated seed material with a second monomer and with a second polymerisation initiator while effecting suspension polymerisation thereof, and that in at least the final suspension polymerisation of step (b) the monomer comprises amino styrene, and at least one further vinylic monomer and said second polymerisation initiator is an azo compound.
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Abstract
A process for the preparation of amine-functionalized vinyl polymer particles which process comprises suspension polymerizing aminostyrene together with at least one other vinylic monomer and optionally a crosslinking agent.
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13 Claims
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1. A process for the preparation of monodisperse amine-functionalised vinyl polymer particles wherein said polymer particles have a mode particle diameter of at least 20 μ
- m, which process comprises
(a) obtaining a first particulate polymer seed material having a mode particle diameter of no more than 50 μ
m;(b) using said first seed material, performing a suspension polymerisation to yield a second particulate polymer seed material having a mode particle diameter greater than that of said first seed material, and using said second seed material, performing at least one further suspension polymerisation to yield a particulate polymer seed material whereby the increase in mode particle diameter in step (b) is at least ×
2,wherein at least one of the suspension polymerisations effected in step (b) involves (i) forming an aqueous dispersion comprising a polymer seed material, a first polymerization initiator of an organic compound which has a molecular weight of less than 5000 Daltons and a water solubility of less than 10−
2 g/L at 25°
C., a hydroxyalkylmethylcellulose stabilizer and a first monomer;(ii) allowing said organic compound to diffuse into the seed material to produce an activated seed material; and (iii) contacting said activated seed material with a second monomer and with a second polymerisation initiator while effecting suspension polymerisation thereof, and that in at least the final suspension polymerisation of step (b) the monomer comprises amino styrene, and at least one further vinylic monomer and said second polymerisation initiator is an azo compound. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- m, which process comprises
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12. A process for the preparation of monodisperse amine-functionalised vinyl polymer particles wherein said polymer particles have a mode particle diameter of at least 50 μ
- m, which process comprises
(a) obtaining a first particulate polymer seed material having a mode particle diameter of no more than 50 μ
m;(b) using said first seed material, performing a first suspension polymerisation to yield a second particulate polymer seed material having a mode particle diameter greater than that of said first seed material and using said second seed material performing a second suspension polymerisation to yield a third particulate polymer seed material and using said third seed material, performing a polymerisation to yield a fourth particulate polymer seed material whereby the increase in mode particle diameter in step (b) is at least ×
2;
wherein at least one of the suspension polymerisations effected in step (b) involves(i) forming an aqueous dispersion comprising a polymer seed material, a first polymerisation initiator of an organic compound which has a molecular weight of less than 5000 Daltons and a water solubility of less than 10−
2 g/L at 25°
C., a hydroxyalkylmethylcellulose stabilizer and a first monomer;(ii) allowing said organic compound to diffuse into the seed material to produce an activated seed material; and (iii) contacting said activated seed material with a second monomer and with a second polymerisation initiator while effecting suspension polymerisation thereof, and that in at least the final polymerisation of step (b) the monomer comprises amino styrene, and at least one further vinylic monomer and said second polymerisation initiator is an azo compound. - View Dependent Claims (13)
- m, which process comprises
Specification