Patent ID: 7816424

Claim:
A biodegradable plastics composition comprising: 100 parts by mass of a biodegradable plastics, 0.01 to 10 parts by mass of a carbodiimide compound, 0.01 to 5 parts by mass of an ultraviolet absorbent, and 0.01 to 3 parts by mass of an antioxidant which is at least one of a hindered phenol-based antioxidant and a phosphite-based antioxidant, wherein the hindered phenol-based antioxidant is at least one selected from the group consisting of 4,4′-methylene-bis-(2,6-di-t-butylphenol), octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, pentaerythritoltetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] and 3,9-bis[2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]-1,1-dimethylethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane, and the phosphite-based antioxidant is at least one selected from the group consisting of tris-(2,4-di-t-butylphenyl)phosphite, bis-(2,4,di-t-butylphenyl)pentaerythritol-diphosphite, bis-(2,6-di-t-butyl-4-methylphenyl)pentaerythritol-diphosphite, [bis(2,4-di-t-butyl-5-methylphenoxy)phosphino]biphenyl and N,N-bis[2-[[2,4,8,10-tetrakis(1,1-dimethylethyl)dibenzo[d,f][1,3,2]dioxaphosphepin-6-yl]oxy]-ethyl]ethaneamine.