Mitsubishi Rayon Company, Limited

Yuichiro Kishimoto

Seiya Koyanagi

Shinji Saiki

Yoshihito Nakahara

Kentaro Hayashi

Katsumi Yonekura

Yukihiro Ikegami

An acrylic premix comprising 10 to 90% by weight of (A) an acrylic resin composition consisting of an acrylic mono-functional monomer (a1), an acrylic poly-functional monomer (a2) containing at least one compound represented by any of the following general formulae (I) to (IV), and an acrylic polymer (b); 10 to 90% by weight of an inorganic filler (B); and 0.01 to 10 parts by weight of a curing agent (C) based on 100 parts by weight of the total amount of the components (A) and (B); acrylic artificial marble using the same; and a method for producing the same. The premix is useful for providing an acrylic SMC or BMC having excellent molding property at high temperature, molding processability, thickening property and storage stability.

Acrylic premix, acrylic artificial marble and production method thereof

The present invention is directed to an acrylic resin composition obtained by adding a non-crosslinked polymer powder having a bulk density within the range from 0.1 to 0.7 g/ml, an oil absorption based on linseed oil within the range from 60 to 200 ml/100 g and a degree of swelling by methyl methacrylate of 16-fold or more as a thickening agent to acrylic syrup; and acrylic premix obtained by mixing an inorganic filler with this composition; and acrylic premix obtained by extruding constituent components by a kneading extruder to continuously form the mixture; and a method for producing an acrylic artificial marble in which these acrylic premixes are cured.

Acrylic resin composition, acrylic premix, process for producing acrylic artificial marble and thickening agent

A (meth)acrylic premix comprising a (meth)acrylic resin composition (A) containing a (meth)acrylic monomer (a) and a (meth)acrylic polymer (b), an inorganic filler (B), and a curing agent (C), wherein, the component (a) is a (meth)acrylate having a bicyclo ring, fluorine atom, cyclic ether, cyclohexane ring or tricyclo ring, and the component (C) is a radical polymerization initiator having a 10 hours half-life temperature of 75&deg; C. or more; an acrylic SMC or BMC comprising this (meth)acrylic premix and a thickening agent; and a method for producing (meth)acrylic artificial marble, wherein this (meth)acrylic SMC or BMC is cured with being pressurized and heated at a temperature in the range from 105 to 150&deg; C., are provided. These are useful for producing (meth)acrylic artificial marble having various excellent physical properties such as appearance, dimension stability, hot water resistance, weatherability.

(Meth)acrylic premix, (meth)acrylic SMC or BMC, and process producing (meth)acrylic artificial marble

An acrylic SMC or BMC, in which when a polymer powder (C) having a bulk density in the range from 0.1 to 0.7 g/ml, an oil absorption of lin-seed oil in the range from 60 to 200 mi/100 g, a degree of swelling by methyl methacrylate is 16-fold or more and a specific surface area in the range from 1 to 100 m,/g is added as a thickening agent, hot water resistance is improved by using a polymer powder (C,) containing no surfactant, a polymer powder (C,) containing as a constituent component a reactive surfactant, or thickening speed is controlled by using a non-cross linked polymer powder (C,) having a Mw from 100,000 to 2,500,000, a non-crosslinked polymer powder (C,) having a Ma from 2,500,000 to 5,000,000, a crosslinked polymer powder (C,) and a polymer powder (D) having a specific surface area from 0.01 m,/g to 1 m,/g; a production method thereof; a method for producing acrylic artificial marble in which components are extruded by a kneading extruder (9) into given shape; and a thickening agent.

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Aichi, Japan

Yuichiro Kishimoto