Particulate vinyl polymer and water-base coating composition using the same
AssigneeMitsubishi Rayon Co., Ltd.
InventorsMakoto Moriya, Seiji Nishimura, Yasutaka Doi
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Abstract
A particulate vinyl polymer is provided. At least 95 wt. % of its particles have a minor axis A and a major axis B, which are in a relationship of 1.ltoreq.B/A.ltoreq.1.5 and individually range from 30 .mu.m to 400 .mu.m. The polymer has an acid value of from 30 to 150 mg KOH/g. This particulate vinyl polymer is excellent in workability such as the solubility in aqueous medium, and is useful as a raw material for water-base coating compositions having superb dispersion of a pigment and excellent waterproofness.
Claims4
A particulate vinyl polymer, comprising at least 95 wt. % of particles thereof having a minor axis A and a major axis B, said minor and major axes A and B being in a relationship of 1.ltoreq.B/A.ltoreq.1.5 and individually ranging from 30 .mu.m to 400 .mu.m, and said polymer having an acid value of from 30 to 150 mg KOH/g, rendering said particulate vinyl polymer water soluble and wherein said polymer comprises (a) 30 to 90wt. % of methyl methacrylate, (b) 0 to 30 wt. % of an aromatic vinyl compound, (c) 4 to 30 wt. % of an acidic-group-containing vinyl compound and (d) 0 to 66 wt. % of a further vinyl monomer copolymerizable with methyl methacrylate, said aromatic vinyl compound and said acidic-group-containing vinyl compound.
Dependencies are inferred from the claim text.