Kanegafuchi Kagaku Kogyo Kabushiki Kaisha

Toshihiko Hasegawa

Hideki Hosoi

Taizo Aoyama

Akira Takaki

Hiroto Mori

Kuniyoshi Matsuba

Toshiro Shimatani

Hitoshi Hayashi

A process for preparing a synthetic resin powder having an improved blocking resistance suitable as a modifier for vinyl chloride resins, which comprises coagulating an aqueous latex of a graft copolymer suitable as a modifier for vinyl chloride resins, mixing the resulting, slurry with a latex of a specific polymer of methyl methacrylate, an aromatic vinyl compound, a crosslinkling monomer and optionally other copolymerizable monomers or a slurry formed from the specific polymer latex by coagulation, and recovering a powder from the resulting mixture containing the coagulated graft copolymer and the coagulated specific polymer.

Process for preparing synthetic resin powder having improved blocking

A vinyl chloride resin composition having an improved impact resistance with a good transparency that the vinyl chloride resin itself possesses originally; which comprises (A) a graft copolymer prepared by (i) adding a water-soluble electrolyte to a butadiene polymer (a) (ii) adding a monomer mixture (b) containing mainly an aromatic vinyl monomer to polymerize, (iii) adding a monomer mixture (c) containing mainly an alkyl methacrylate to polymerize and (iv), when desired, adding a monomer mixture (d) containing mainly an aromatic vinyl monomer.

Vinyl chloride resin composition

A vinyl chloride resin composition including: (1) 100 parts by weight of a vinyl chloride resin and (2) 0.1 to 30 parts by weight of a two-stage polymer, said polymer (2) being prepared by emulsion-polymerizing 60 to 95 parts by weight of a monomer mixture (A) of 50 to 95% by weight of methyl methacrylate, 5 to 50% by weight of an alkyl methacrylate with a C.sub.2 to C.sub.8 alkyl group and 0 to 20% by weight of a vinyl monomer to give a polymer latex and then polymerizing 40 to 5 parts by weight of a monomer mixture (B) of 20 to 80% by weight of an alkyl acrylate and/or an alkyl methacrylate other than methyl methacrylate, 80 to 20% by weight of methyl methacrylate and 0 to 20% by weight of a vinyl monomer in the presence of said polymer latex, said polymer (2) having a particle size of not more than 1000 .ANG. in the latex, and a specific viscosity at 30.degree. C. of the solution wherein 0.4 g of said polymer (2) is dissolved in 100 ml of benzene of 1 or more. The composition is excellent in transparency and secondary processability as well as in processability. Thus, a composition having excellent properties can be prepared by admixing a small amount, such as 0.1 to 30 parts by weight of the two-stage polymer as the agent for improving the processability with 100 parts by weight of the vinyl chloride resin.

A vinyl chloride polymer composition comprising

Vinyl chloride polymer composition

A vinyl chloride resin composition having improved weather resistance and impact resistance which contains, as a modifier, a graft copolymer which is prepared by graft-polymerizing 50 to 15 parts by weight of a monomer component composed of mainly methyl methacrylate on 50 to 85 parts by weight of a cross-linked alkyl acrylate polymer so that 30 to 90% by weight of the monomer component is graft-polymerized and, then, the remaining portion of the monomer component is graft-polymerized in the presence of 0.1 to 5% by weight, based on the whole amount of the monomer component, of a copolymerizable cross-linking agent, the fraction extracted from said graft polymer with methyl ethyl ketone having a specific viscosity of at least 0.6 as measured in a concentration of 0.1 g/100 cc in acetone at 30.degree. C. The composition has a reduced die swelling and provides shaped articles having excellent weather resistance and impact strength.

Vinyl chloride resin composition having improved weather resistance and

A vinyl chloride polymer composition comprising (A) 3 to 50 parts by weight of a grafted copolymer and (B) 97 to 50 parts by weight of a vinyl chloride polymer, a total amount of the copolymer (A) and the polymer (B) being 100 parts by weight; the grafted copolymer (A) comprising

A vinyl chloride polymer composition comprising (A) 5 to 50% by weight of a MBS resin prepared by firstly graft-polymerizing 15 to 40 parts by weight of monomer component comprising 80 to 100% by weight of methyl methacrylate and 20 to 0% by weight of one or more other vinyl monomers capable of copolymerizing with methyl methacrylate onto 40 to 70 parts by weight of a styrene-butadiene rubber including not more than 50% by weight of styrene, and then, onto the obtained copolymer, secondly graft-polymerizing 10 to 40 parts by weight of monomer component comprising 80 to 100% by weight of styrene and 20 to 0% by weight of one or other vinyl monomers capable of copolymerizing with styrene, a total amount of said styrene-butadiene rubber, the first graft-polymerizing monomer component and the second graft-polymerizing monomer component being 100 parts by weight, and (B) 95 to 50% by weight of vinyl chloride polymer wherein;

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Hyogo, Japan

Toshihiko Hasegawa