Abstract: A water-based maskant composition and a chemical milling method using the maskant composition. Said water-based maskant composition comprises 100 parts by weight (as solids) of a latex constituent consisting of (a) 5-60 parts by weight (as solids) of a copolymer latex obtained by emulsion-polymerization of a monomer mixture consisting of 30-70% by weight of an aliphatic conjugated diene compound, 20-70% by weight of an aromatic vinyl compound, 0-10% by weight of an ethylenically unsaturated carboxylic acid and 0-50% by weight of a vinyl compound copolymerizable therewith and (b) 95-40 parts by weight (as solids) of a natural rubber latex; 10-500 parts by weight of a filler; and 0.1-10 parts by weight of a thickener, wherein the vicosity at 25.degree. C. is 500-5,000 cps as measured by BH type rotor at 20 rpm at a solids concentration of 50% by weight, the pH is 7-9 and the tensile strength and elongation of a film obtained from the composition are 50-150 kgf/cm.sup.

Abstract: Polymer particles including polysiloxane is disclosed. The polymer particles are prepared by condensing at least one organosilane or organosiloxane compound in the presence of organic polymer particles which are prepared from specific monomers and dispersed in an aqueous medium. The polymer particles possess excellent water resistance, weatherability, water repellency, adhesion, and flexing resistance, and thus are useful as water paints, coating agents, carpet packing material, floor polishing agents, cementing medium, and the like.

Abstract: An aqueous pressure-sensitive adhesive consisting essentially of (1) 100 parts by weight (in terms of solids content) of an aqueous copolymer emulsion obtained by emulsion-polymerizing a monomer mixture consisting of 70-99.9% by weight of at least one alkyl (meth)acrylate in which the alkyl group has 4-12 carbon atoms, 0.1-10% by weight of an .alpha.,.beta.-unsaturated carboxylic acid and 0-29.9% by weight of a monomer copolymerizable therewith, (2) 0.1-10 parts by weight of a phosphoric acid ester compound, and (3) a polyglycidyl compound in such an amount that the proportion of the epoxy group in the polyglycidly compound is 0.1-3 equivalents per equivalent of the carboxyl group in the aqueous copolymer. This aqueous pressure-sensitive adhesive has excellent balance in adhesion to adherend, peelability from adherend and anchoring to substrate; and the peelability from adherend is not varied depending upon the type of adherend and does not change with time or by heating.