Process for preparing polymeric beads
First Claim
1. The process for preparing hydrophilic polymeric beads by polymerization in an organic liquid medium of one or more hydrophilic monomers and at least one cross linking monomer in the presence of a free radical initiator and a regenerator amine, said amine being selected from the group consisting of secondary amines and tertiary amines wherein the monomers are initially dissolved in the liquid medium and wherein the the copolymer is insoluble in the liquid medium, the polymerization being maintained at a temperature from 15°
- to 35°
C. for a period of one half to 48 hours whereby cross linked polymeric beads having an average diameter from 0.1 to 10 microns are precipitated from said solvent.
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Abstract
A process for preparing hydrophilic polymeric beads by suspension polymerization of one or more hydrophilic monomers and a cross-linking monomer in the presence of a free radical initiator and a regenerator amine at a temperature between 15° and 35° C. The beads are useful as abrasives in various cleaning compositions.
18 Citations
12 Claims
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1. The process for preparing hydrophilic polymeric beads by polymerization in an organic liquid medium of one or more hydrophilic monomers and at least one cross linking monomer in the presence of a free radical initiator and a regenerator amine, said amine being selected from the group consisting of secondary amines and tertiary amines wherein the monomers are initially dissolved in the liquid medium and wherein the the copolymer is insoluble in the liquid medium, the polymerization being maintained at a temperature from 15°
- to 35°
C. for a period of one half to 48 hours whereby cross linked polymeric beads having an average diameter from 0.1 to 10 microns are precipitated from said solvent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- to 35°
Specification