Abstract: Crosslinked, preferably acrylic, polymer particles characterized in that the particles formed by free radical addition polymerization of:(a) between about 0.8 and about 20 weight percent each of first and second ethylenically saturated monomers each bearing functionality capable of crosslinking reaction with the other; and(b) between about 98.

Abstract: A methacrylic resin capable of selectively absorbing light rays having a wavelength of 580 nm is advantageously produced either by dispersing or dissolving neodymium compound in a resin-forming starting material selected from monomeric methyl methacrylate, a monomer mixture composed mainly of methyl methacrylate and partially polymerized products thereof, and polymerizing the resin-forming starting material. A solvent capable of dissolving therein the resin-forming starting material and the neodymium compound may be incorporated in the resin-forming starting material.

Abstract: A stable copolymer dispersion is prepared by addition copolymerization of (1) a monomeric adduct of an active hydrogen compound, e.g., a polyether polyol, and an acrylyl compound such as methacryloyl chloride with (2) ethylenically unsaturated monomer(s), e.g., styrene or a mixture thereof with acrylonitrile, while (1) and (2) are dispersed or dissolved in an excess of an active hydrogen polyfunctional compound such as a polyether polyol. The molar ratio of acrylyl moiety to active hydrogen compound is less than 0.1:1. The resulting dispersion has a controlled particle size and a viscosity such that it is suitably employed in the production of polyurethane foams.

Abstract: Thermosetting solvent solution coating compositions are disclosed which form hard and impact resistant baked coatings of good gloss retention on exterior exposure. These compositions comprise a butanol-containing solvent having dissolved therein a solution copolymer obtained by copolymerizing from 55% to 75% of vinyl acetate with from 15% to 40% of C.sub.2 -C.sub.8 hydroxyalkyl acrylate or methacrylate, from 3% to 10% of C.sub.2 -C.sub.4 hydroxyalkyl acrylate or methacrylate, and from about 0.5% to about 5% of copolymerizable monoethylenically unsaturated carboxylic acid in organic solvent medium consisting essentially of a butanol at a solids content of at least 65%. This copolymer is used in admixture with a polyalkoxy-methyl melamine in an amount of from 8% to 20%, based on the mixture.

Abstract: A dispersion of iron oxide pigments, selected according to particle size to avoid interference with desired properties is added to a polymerizable acrylic composition containing alumina trihydrate as filler. This mixture is cured to form a filled polymeric structure containing 15 to 80% by weight polymethyl methacrylate and 20 to 85% by weight alumina trihydrate with a pleasing uniform color, maintaining desired properties of machinability, translucency, and visual depth.

Abstract: A method of making an acrylic microgel resin which comprises preparing an aqueous microgel emulsion of an acrylic resin which is crosslinked with a multifunctional crosslinking agent, removing water from the emulsion by coagulation and/or azeotropic distillation with an organic solvent in which the microgel is insoluble and which forms an azeotrope with water, and incorporating the thus dehydrated microgel into an acrylic resin which has been prepared by solution polymerization in organic solvent.

Abstract: A polymer concrete comprising by weight about 40-70% coarse aggregate, about 20-55% of a fine aggregate such as sand, about 2-15% silica flour and about 8% to 12% furfuryl alcohol polymerized in situ with an acid catalyst produces a highly cross-linked concrete which contains no cement and is mixed with water. The furfuryl polymer concrete provides the broadest range of chemical resistance of all existing polymer concretes. The coarse and fine aggregate have a pH less than 7.0 and are provided with a specific size gradation.