Polylactic acid, binder composition, and baking paste

A polylactic acid binder with controlled L-lactic acid and D-lactic acid ratios addresses the issues of residual carbon and poor performance in conventional binders, ensuring uniform dispersion and low defect formation in miniaturized MLCCs.

JP7883865B2Active Publication Date: 2026-07-02SOKEN CHEM & ENG CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
SOKEN CHEM & ENG CO LTD
Filing Date
2022-03-07
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Conventional firing pastes containing ethylcellulose or polyvinyl butyral for internal electrodes in MLCCs have high residual carbon content and poor firing performance, failing to achieve uniform dispersion and excellent coating properties, especially with capacitor miniaturization.

Method used

A polylactic acid binder with specific L-lactic acid and D-lactic acid ratios, ranging from 60 to 93% by mass, is used, providing rheological properties that allow for solvent solubility without residue and superior firing performance, including a weight-average molecular weight of 50,000 to 300,000, and pseudoplasticity for uniform dispersion.

Benefits of technology

The polylactic acid binder ensures uniform dispersion and excellent coating properties, reducing residual carbon after firing, enabling pattern formation in smaller capacitors with low defect risk.

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Abstract

To provide a polylactic acid for sintering paste that can be dissolved in a solvent without visible undissolved residues, has effective rheological properties when mixed with the solvent, and also has excellent sinterability.SOLUTION: A polylactic acid includes an L-isomer component and a D-isomer component. When the total of the L-isomer and D-isomer components in the polylactic acid is defined as 100 mass%, the content ratio of the L-isomer component, which is termed the L-lactic acid ratio, or the content ratio of the D-isomer component, which is termed the D-lactic acid ratio, ranges from 60 to 93 mass%.SELECTED DRAWING: None
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