To obtain a transparent injection molding having an excellent balance of surface gloss, surface hardness and strength.
In injection molding a resin composition (100 pts.wt. of the total of A+B) comprising 3-10 pts.wt. of a graft polymer (A) obtained by subjecting 40-95 pts.wt. (total) of a monomer mixture composed of 60-80 wt.% of a (meth)acrylic acid ester-based monomer, 40-20 wt.% of a styrene-based monomer and 0-20 wt.% of a copolymerizable another monomer to graft polymerization in the presence of 5-60 pts.wt. of a rubber-like polymer having 0.2-0.8 μm volume-average particle diameter and 97-90 pts.wt. of a copolymer (B) comprising 20-40 wt.% of a styrene-based monomer, 60-80 wt.% of a (meth)acrylic acid ester-based monomer and 0-20 wt.% of another copolymerizable monomer in molds, the molding is carried out in a state in which the surface temperatures of the molds are kept at ≥80°C and when the thickness of the resin molding is 3 mm, the resin molding has the total light transmittance of ≥80% and pencil hardness of F or above.
YANO MASATO
KOBA TAKASHI
YOSHIMURA TATSUYA
| JP2004010739A | 2004-01-15 | |||
| JP2005220265A | 2005-08-18 | |||
| JP2004210891A | 2004-07-29 |
Next Patent: OPTICAL RESIN MOLDING