Resin composition for injection molding and injection molded body

By adjusting the monomer composition and molecular weight ratio of poly(3-hydroxyalkanoate) resins, and combining crystal nucleating agents and inorganic fillers, the burr problem of poly(3-hydroxyalkanoate) resins was solved, achieving mechanical strength and environmental friendliness of injection-molded parts at high temperatures.

CN116194269BActive Publication Date: 2026-06-19KANEKA CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
KANEKA CORP
Filing Date
2021-09-16
Publication Date
2026-06-19

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Abstract

This invention relates to a resin composition for injection molding, comprising a poly(3-hydroxyalkanoate) resin. The poly(3-hydroxyalkanoate) resin comprises at least one copolymer of 3-hydroxybutyrate units and other hydroxyalkanoate units. The average content of 3-hydroxybutyrate units in the poly(3-hydroxyalkanoate) resin is 92 mol% or more and 99 mol% or less. The poly(3-hydroxyalkanoate) resin, obtained by gel permeation chromatography using chloroform solvent, has a polystyrene-converted weight-average molecular weight of 210,000 or more and 380,000 or less, and the proportion of components with a weight molecular weight of 200,000 or less in the weight molecular weight distribution is 35 wt% or more and 60 wt% or less.
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