Polyester molding for use with a casing
By molding a biodegradable plastic material which is treated with a compound reactive to the active hydrogen in the biodegradable plastic material, a biodegradable plastic material and molding having long-term reliability are obtained.
1. A biodegradable plastic material treated with a compound reactive to active hydrogen contained in said biodegradable plastic material;
wherein said biodegradable plastic material comprises a polycaprolactone;
wherein said biodegradable plastic material further comprises a silicate, said silicate taking the form of particles having an average diameter of 50 μm or less; and
wherein said compound reactive to active hydrogen comprises a bridging agent having a carbodiimide group comprising diisopropylcarbodiimide.
2. The biodegradable plastic material according to claim 1 , wherein the acid value of said biodegradable plastic material treated with said compound reactive to active hydrogen is 0.5 or less.
3. The biodegradable plastic material according to claim 1 , wherein after said biodegradable plastic material is subjected to aging for 48 hours at 80° C. and 80% relative humidity, an increase in acid value and a decrease in molecular weight of said biodegradable plastic material are 0.2 or less and 10% or less, respectively.
4. The biodegradable plastic material according to claim 1 , wherein the active hydrogen is attributable to one or more atomic groups comprising the polycaprolactone which are selected from the group consisting of a carboxyl group and a hydroxyl group.
5. The biodegradable plastic material according to claim 1 , wherein the silicon dioxide content of said silicate is 50% or more.
6. A biodegradable plastic molding, comprising a biodegradable plastic material treated with a compound reactive to active hydrogen contained in said biodegradable plastic material;
wherein said biodegradable plastic material comprises a polycaprolactone;
wherein said biodegradable plastic material further comprises a silicate, said silicate taking the form of particles having an average diameter of 50 μm or less; and
wherein said compound reactive to active hydrogen comprises a bridging agent having a carbodiimide group comprising diisopropylcarbodiimide.
7. The biodegradable plastic molding according to claim 6 , wherein said biodegradable plastic molding comprises a casing of an electric appliance.
8. The biodegradable plastic molding according to claim 6 , wherein the acid value of said biodegradable plastic material treated with the active hydrogen is 0.5 or less.
9. The biodegradable plastic molding according to claim 6 , wherein after said biodegradable plastic molding is subjected to aging at 80° C. and 80% relative humidity for 48 hours, a rise in acid value and a decrease in molecular weight are 0.2 or less and 10% or less, respectively.
10. The biodegradable plastic molding according to claim 6 , wherein the active hydrogen is attributable to one or more atomic groups comprising the polycaprolactone which are selected from the group consisting of a carboxyl group and a hydroxyl group.
11. The biodegradable plastic molding according to claim 6 , wherein the silicon dioxide content of said silicate is 50% or more.