An acrylic rubber including: a polymer composition of: 70 to 99.9% by weight of a bonding unit derived from at least one (meth) acrylic acid ester selected from (meth) acrylic acid alkyl ester and (meth) acrylic acid alkoxyalkyl ester; 0.1 to 10% by weight of a bonding unit derived from a monomer containing a reactive group; and 0 to 20% by weight of a bonding unit derived from other monomer, wherein ash content is 0.15% by weight or less, total amount of sodium and sulfur in the ash is 60% by weight or more, a ratio of sodium to sulfur by weight ratio is in the range of 0.5 to 2.5, ratio of Z-average molecular weight to weight average molecular weight is 1.3 or more, and weight average molecular weight is in the range of 1,000,000 to 5,000,000.

A method for producing a polytetrafluoroethylene powder, which includes applying an ultrasonic wave to a polytetrafluoroethylene aqueous dispersion containing polytetrafluoroethylene particles to coagulate the polytetrafluoroethylene particles.

A method for producing a polytetrafluoroethylene powder, which includes applying an ultrasonic wave to a polytetrafluoroethylene aqueous dispersion containing polytetrafluoroethylene particles to coagulate the polytetrafluoroethylene particles.

The invention relates to a process for producing graft copolymers based on acrylonitrile-butadiene-styrene copolymers (ABS), wherein the graft copolymers may be dewatered particularly readily after production and precipitation and have a low residual moisture content after centrifugation. The invention further relates to a process for producing thermoplastic molding materials using the thus obtained ABS graft copolymers.

The invention relates to a process for producing graft copolymers based on acrylonitrile-butadiene-styrene copolymers (ABS), wherein the graft copolymers may be dewatered particularly readily after production and precipitation and have a low residual moisture content after centrifugation. The invention further relates to a process for producing thermoplastic molding materials using the thus obtained ABS graft copolymers.

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.

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.

The present disclosure relates to a thermoplastic resin having excellent non-whitening properties, impact strength, gloss, and fluidity, and a method of preparing the thermoplastic resin. The thermoplastic resin includes an alkyl acrylate-alkyl methacrylate graft copolymer (A), or the copolymer (A) and a matrix resin (B) including an alkyl methacrylate polymer and/or an alkyl methacrylate-alkyl acrylate copolymer. A transparency of the thermoplastic resin having a thickness of 0.15 mm is less than 2, a total content of the alkyl acrylate in the thermoplastic resin is 20 to 50% by weight, and a butyl acrylate coverage value (X) as calculated by Equation 1 below is 50 or more:

X={(G−Y)/Y}×100,  [Equation 1] wherein G represents a total gel content (%) of the thermoplastic resin, and Y represents a content (% by weight) of butyl acrylate in the gel of the thermoplastic resin.

The present disclosure relates to a thermoplastic resin having excellent non-whitening properties, impact strength, gloss, and fluidity, and a method of preparing the thermoplastic resin. The thermoplastic resin includes an alkyl acrylate-alkyl methacrylate graft copolymer (A), or the copolymer (A) and a matrix resin (B) including an alkyl methacrylate polymer and/or an alkyl methacrylate-alkyl acrylate copolymer. A transparency of the thermoplastic resin having a thickness of 0.15 mm is less than 2, a total content of the alkyl acrylate in the thermoplastic resin is 20 to 50% by weight, and a butyl acrylate coverage value (X) as calculated by Equation 1 below is 50 or more:

X={(G−Y)/Y}×100,  [Equation 1] wherein G represents a total gel content (%) of the thermoplastic resin, and Y represents a content (% by weight) of butyl acrylate in the gel of the thermoplastic resin.

A thermoplastic molding composition comprising (A) 15 to 45 wt.-% graft copolymer (A) obtained by emulsion polymerization of styrene and acrylonitrile in presence of an agglomerated butadiene rubber latex (A1) with D50 of 150 to 800 nm; (B) 40 to 75 wt.-% copolymer (B) of styrene and acrylonitrile having a weight ratio of 80:20 to 65:35 and Mw of 150,000 to 300,000 g/mol, (C) 2.0 to 5.0 wt.-% elastomeric block copolymer (C) made from 15 to 65 wt.-% diene, and 35 to 85% by weight vinylaromatic monomer; (D) 2.0 to 5.0 wt.-% titanium dioxide pigment D comprising at least 95 wt.-% titanium dioxide and 1.7 to 3.3 wt.-% alumina; and (E) 0 to 7.0 wt.-% of at least one additive/processing aid (E) different from (D); having a high chemical resistance, high color and thermal stability and low tendency to delamination. This can be used for sheet extrusion and thermoforming, in particular as inner liner for a cooling apparatus.