Disclosed is a thermoplastic transparent resin composition and a method
for manufacturing the same. The resin composition includes 3-15 parts by weight
of small aperture polybutadiene rubber latex; 5-25 parts by weight of large aperture
polybutadiene rubber latex; 40-70 parts by weight of a methacrylic acid alkylester
compound or an acrylic acid alkylester compound; 15-30 parts by weight of an aromatic
vinyl compound; and 1-20 parts by weight of a vinylcyan compound. The method includes
the steps of a) producing a small aperture polybutadiene rubber latex having an
average particle diameter of 600-1500 A, a gel content of 70-95%, and a swelling
index of 12-30 by reacting butadiene at 55-70 C. using a polymerization initiator,
b) producing a large aperture polybutadiene rubber latex having a particle diameter
of 2600-5000 A, a gel content of 70-95%, and a swelling index of 12-30 by enlarging
the small aperture polybutadiene rubber latex particles; c) performing graft copolymerization
at 65-80 C. by continuously or separately adding 3-15 parts by weight of
the small aperture polybutadiene rubber latex of step a), 5-25 parts by weight
of the large aperture polybutadiene rubber latex of step b), 40-70 parts by weight
of a methacrylic acid alkylester compound or an acrylic acid alkylester compound,
15-30 parts by weight of an aromatic vinyl compound, and 1-20 parts by weight of
a vinylcyan compound.
