POLYPROPYLENE-POLYLACTIC ACID RESIN COMPOSITION

1 - 8 . (canceled)

9 . A polypropylene resin composition comprising:

(A) 40-80 parts by weight of a polypropylene resin,

(B) 10-45 parts by weight of a polylactic acid resin, and

(C) 3-30 parts by weight of a reactive compatibilizer according to the following general formula:

wherein,

P is polypropylene;

R is a saturated or unsaturated C 1-5 hydrocarbon chain; and

E is a C 1-10 hydroxyalkyl, aminoalkyl or carboxyalkyl.

10 . The polypropylene resin composition according to claim 9 , further comprising:

(D) 20 parts by weight or less of an impact modifier, and

(E) 20 parts by weight or less of an inorganic filler.

11 . The polypropylene resin composition according to claim 9 , wherein the polypropylene resin is at least one selected from the group consisting of a propylene homopolymer, a propylene block copolymer, and a propylene random copolymer, wherein the melt index of the polypropylene resin is preferably 0.5-30 grams/10 min (American Society for Testing and Materials (ASTM) D1238, 230° C., 2.16 kg).

12 . The polypropylene resin composition according to claim 9 , wherein the polylactic acid resin is at least one selected from the group consisting of poly-L-lactic acid, poly-D-lactic acid, and poly-(D,L)-lactic acid, wherein the weight average molecular weight of the polylactic acid is in the range of 50,000-400,000 grams/mole.

13 . The polypropylene resin composition according to claim 9 , wherein the reactive compatibilizer is at least one selected from the group consisting of a polypropylene-glycidyl methacrylate graft copolymer, a polypropylene-N-(hydroxyalkyl)maleimide graft copolymer, a polypropylene-N-(carboxyalkyl)maleimide graft copolymer, and a polypropylene-N-(aminoalkyl)maleimide graft copolymer.

14 . The polypropylene resin composition according to claim 10 , wherein the impact modifier is at least one selected from the group consisting of an amorphous ethylene-α-olefin copolymer, an ethylene propylene diene copolymer (EPDM), a styrene thermoplastic elastomer, and acryl copolymer.

15 . The polypropylene resin composition according to claim 10 , wherein the inorganic filler is at least one selected from the group consisting of talc, clay, calcium carbonate, glass fiber, mica, wollastonite, and silica.

16 . The polypropylene resin composition according to claim 9 , wherein the heat deflection temperature (American Society for Testing and Materials (ASTM) D648) of the composition before aging is 90° C. or more.

17 . The polypropylene resin composition according to claim 10 , wherein the polypropylene resin is at least one selected from the group consisting of a propylene homopolymer, a propylene block copolymer, and a propylene random copolymer, wherein the melt index of the polypropylene resin is preferably 0.5-30 grams/10 min (American Society for Testing and Materials (ASTM) D1238, 230° C., 2.16 kg).

18 . The polypropylene resin composition according to claim 10 , wherein the polylactic acid resin is at least one selected from the group consisting of poly-L-lactic acid, poly-D-lactic acid, and poly-(D,L)-lactic acid, wherein the weight average molecular weight of the polylactic acid is in the range of 50,000-400,000 grams/mole.

19 . The polypropylene resin composition according to claim 10 , wherein the reactive compatibilizer is at least one selected from the group consisting of a polypropylene-glycidyl methacrylate graft copolymer, a polypropylene-N-(hydroxyalkyl)maleimide graft copolymer, a polypropylene-N-(carboxyalkyl)maleimide graft copolymer, and a polypropylene-N-(aminoalkyl)maleimide graft copolymer.

20 . The polypropylene resin composition according to claim 10 , wherein the heat deflection temperature (American Society for Testing and Materials (ASTM) D648) of the composition before aging is 90° C. or more.