Polylactic acid resin composition for 3D printing
AssigneeSK Chemicals Co., Ltd.
InventorsMin-young Kim, Jong Ryang Kim, Tae-Young Kim, Sung-wan Jeon
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Abstract
A polylactic acid resin composition, which comprises: a hard segment containing a polylactic acid repeat unit; and a soft segment containing a polyurethane polyol repeat unit in which polyether-based polyol repeat units are linearly connected to each other via a urethane linkage, can be processed at low temperatures and at high rates, has a high solidification rate, and is eco-friendly, due to a low melting point thereof, and thus is useful for 3D printing.
Claims8
A polylactic acid resin composition for three-dimensional (3D) printing, comprising:
- (a) a hard segment comprising a polylactic acid repeat unit represented by Formula 1;
- and (b) a soft segment comprising a polyurethane polyol repeat unit in which polyether-based polyol repeat units represented by Formula 2 are linearly linked via urethane bonds,
- wherein the composition has a melting temperature of 170° C. or less, a glass transition temperature of 55° C. or less, a number-average molecular weight of 50,000 or more, and a viscosity of 1,000 Pas or less when measured at a temperature of 200° C. and at a shear rate of 100 s−1:
- wherein n in Formula 1 is an integer ranging from 700 to 5,000;
- and, in Formula 2, A is a linear or branched alkylene group having 2 to 5 carbon atoms, and m is an integer ranging from 10 to 100.
A method of 3D printing using a polylactic acid resin composition, which comprises:
- (a) a hard segment comprising a polylactic acid repeat unit represented by Formula 1;
- and (b) a soft segment comprising a polyurethane polyol repeat unit in which polyether-based polyol repeat units represented by Formula 2 are linearly linked via urethane bonds,
- wherein the composition has a melting temperature of 170° C. or less, a glass transition temperature of 55° C. or less, a number-average molecular weight of 50,000 or more, and a viscosity of 1,000 Pas or less when measured at a temperature of 200° C. and at a shear rate of 100 s−1:
- wherein n in Formula 1 is an integer ranging from 700 to 5,000;
- and, in Formula 2, A is a linear or branched alkylene group having 2 to 5 carbon atoms, and m is an integer ranging from 10 to 100.
Dependencies are inferred from the claim text.