Patent ID: 7879440

Claim:
A single-layer matte film or sheet comprising: 55 to 97 wt % of a polylactic acid resin (A); 2 to 30 wt % of chemically modified starch (B) particulates, the chemically modified starch (B) particulates being formed of a starch derivative mixture containing 40 wt % or more of at least one starch derivative (b) selected from the group consisting of starch ester, starch ether, and polyester graft polymer starch; and 1 to 15 wt % of a plasticizer (C), wherein the film or sheet has a micro phase-separation structure in which the polylactic acid resin (A) forms a matrix and the chemically modified starch (B) particulates form a domain, and in a cross-section cut in the transverse direction of the film or sheet (referred to as TD cross-section), an average cross-sectional area of the 20% largest domains of the chemically modified starch (B) particulates is 20,000 nm 2 or larger, and at least one side of the film or sheet has a surface gloss of 60% or lower when measured in accordance with ASTM-D2457-70 (45° gloss).