Transparent thermoplastic resin and method of preparing the same

A thermoplastic resin, comprising:

• an alkyl acrylate-alkyl methacrylate graft copolymer (A), or
• the copolymer (A) and a matrix resin (B) comprising one or more selected from the group consisting of an alkyl methacrylate polymer and an alkyl methacrylate-alkyl acrylate copolymer,
• wherein the copolymer (A) comprises from 25 to 50% by weight of an alkyl acrylate rubber (a-1) having a DLS average particle diameter of from 40 to 120 nm or a TEM average particle diameter of from 25 to 100 nm;
• and from 50 to 75% by weight of an alkyl acrylate-alkyl methacrylate copolymer (a-2) based on 100% by weight in total of the copolymer (A),
• wherein a transparency (haze value), measured according to ASTM D-1003 under a condition of 0.15 mm thickness, is 2 or less, and a transparency measured under a condition of 3 mm thickness is 4 or less,
• wherein a total content of the alkyl acrylate is from 20 to 50% by weight, and
• wherein a butyl acrylate coverage value (X) as calculated by Equation 1 below is 50 or more:
• X={(G−Y)/Y}×100, [Equation 1]
• where 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.