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US 9,868,231 B2Granted
Polyglycolic acid molded article, component for downhole tool, and method of producing polyglycolic acid molded article
AssigneeKureha Corporation
InventorsMizuki Saito, Fuminori Kobayashi
Life of this patent
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Abstract
The polyglycolic acid having a content of low molecular weight substance of less than 1% by weight; and a molded article thereof having a thickness of 2 mm or greater, the time at which immersion of the molded article in water at 66° C. is started to the time at which the polyglycolic acid decomposed by the water starts to elute being 1 hour or longer by 30 hours or shorter, and a rate of embrittlement, at which embrittlement proceeds due to the elution of the polyglycolic acid, being 0.025 mm/h or greater.
Claims7
A polyglycolic acid molded article comprising polyglycolic acid;
- the polyglycolic acid having a content of low molecular weight substance of less than 1% by weight;
- the polyglycolic acid molded article having a thickness of 2 mm or greater,
- the time at which immersion of the polyglycolic acid molded article in water at 66° C. is started to the time at which the polyglycolic acid decomposed by the water starts to elute being 1 hour or longer but 30 hours or shorter, and
- a rate of embrittlement, at which embrittlement of the polyglycolic acid proceeds in a thickness direction from a surface part to a center part of the polyglycolic acid molded article due the elution of the polyglycolic acid, being 0.025 mm/h or greater.
1 more element
Dependencies are inferred from the claim text.