Biodegradable plastic composition and biodegradable plastic shaped body
AssigneesDirector-General of Agency of Industrial Science and Technology, Mitsubishi Gas Chemical Company, Inc.
InventorsYutaka Tokiwa, Akira Iwamoto, Masahiro Harada, Shigeki Imagawa, Teizi Urakami
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Abstract
A biodegradable plastic composition for forming biodegradable shaped bodies which includes a poly-.beta.-hydroxybutyrate having a viscosity of n.sub.A at 185.degree. C. and a polycaprolactone having a viscosity of n.sub.B at 185.degree. C., wherein the poly-.beta.-hydroxybutyrate is present in an amount C.sub.A of 10-45 or 55-85% by weight based on the total weight of the poly-.beta.-hydroxybutyrate and the polycaprolactone, and wherein n.sub.A, n.sub.B and C.sub.A satisfy the following condition: 4.times.10.sup.-3 .times.C.sub.A -1.7.ltoreq.log (n.sub.A /n.sub.B).ltoreq.4.times.10.sup.-3 .times.C.sub.A -1.3.
Claims5
A biodegradable plastic composition consisting essentially of a poly-.beta.-hydroxybutyrate having a viscosity of n.sub.A at 185.degree. C. and a polycaprolactone having a viscosity of n.sub.B at 185.degree. C., said poly-.beta.-hydroxybutyrate being present in an amount of C.sub.A % by weight based on the total weight of said poly-.beta.-hydroxybutyrate and said polycaprolactone, wherein C.sub.A falls within the range of 10-85 but does not fall within the range of 45-55 and wherein C.sub.A, n.sub.A and n.sub.B satisfy the following condition:
- 4.times.10.sup.-3 .times.C.sub.A -1.7.ltoreq.log (n.sub.A /n.sub.B).ltoreq.4.times.10.sup.-3 .times.C.sub.A -1.3.
Dependencies are inferred from the claim text.