Abstract: The present invention addresses the problem of providing an emulsion having excellent emulsion stability and excellent coagulability (salting-out properties) in manufacturing of an acrylic rubber. The present invention provides an acrylic emulsion containing an acrylic polymer having an average particle diameter of 150-300 nm in a step for emulsion-polymerizing a monomer in manufacturing of an acrylic rubber.

Abstract: There is provided a method for more easily producing an acrylic rubber capable of providing a crosslinked rubber having excellent water resistance. A method for producing an acrylic rubber comprising the steps of subjecting a monomer to emulsion polymerization to obtain a polymerized emulsion; mixing the polymerized emulsion with a coagulant to obtain a water-containing crumb; and water-washing the water-containing crumb, wherein, in the step of water-washing the water-containing crumb, the water-containing crumb is water-washed until an electrical conductivity of the washing water after water-washing the water-containing crumb becomes 6.0 mS/cm or less.

Abstract: It is an object of the present invention to provide an acrylic copolymer for providing a highly heat-resistant rubber material that shows a small rate of change in strength without loss of elongation, even under a high-temperature condition over a long period, and a composition containing the acrylic copolymer. The present invention provides an acrylic copolymer comprising a structural unit (A) derived from a monomer containing a structure having a maleimide skeleton, a structural unit (B) derived from an acrylic acid alkyl ester and/or a structural unit (B) derived from an acrylic acid alkoxyalkyl ester, and a structural unit (C) derived from an unsaturated monomer having a crosslinking group; a composition comprising the acrylic copolymer and a crosslinking group; and a rubber material produced from the composition.

Abstract: Provided is an acrylic rubber composition having further improved compression set resistance and comprising, based on 100 parts by mass of (a1) an acrylic rubber obtained by copolymerizing 0.1 to 10% by mass of a crosslinkable group-containing monomer, (a2) 0.4 to 50.0% by mass of a liquid fluororubber, and the crosslinked product thereof.

Abstract: Provided is an acrylic rubber composition having further improved compression set resistance and comprising, based on 100 parts by mass of (a1) an acrylic rubber obtained by copolymerizing 0.1 to 10% by mass of a crosslinkable group-containing monomer, (a2) 0.4 to 50.0% by mass of a liquid fluororubber, and the crosslinked product thereof.