BI-COMPONENT CHAIN EXTENDER MASTER BATCH FOR RPET EXTRUSION FOAMING, AND PREPARATION METHOD THEREFOR

WIPO Patent Application WO/2024/119572

A1

A bi-component chain extender master batch for rPET extrusion foaming, and a preparation method therefor and the use thereof. The master batch comprises a component A chain extender master batch and a component B chain extender master batch, wherein the component A chain extender master batch is prepared from a polyfunctional anhydride chain extender and a low-melting-point PET copolymer by means of carrying out melt extrusion and granulation, with the concentration of the polyfunctional anhydride chain extender in the component A chain extender master batch being 10-30 wt%; the component B chain extender master batch is prepared from a polyfunctional epoxide chain extender and a PET toughener resin by means of carrying out melt extrusion and granulation, with the concentration of the polyfunctional epoxide chain extender in the component B chain extender master batch being 20-50 wt%; and the component A chain extender master batch and the component B chain extender master batch are respectively subjected to chain extension and branching reaction with terminal hydroxyl and terminal carboxyl of rPET, such that the melt strength and foaming performance of rPET are improved, and the problems of the intrinsic viscosity of the rPET raw material being low and the terminal carboxyl concentration thereof being high are effectively solved.

CHEN ZHIQIANG (CN)
XIA TIAN (CN)
CHANG JUNFENG (CN)

PCT/CN2022/144093

June 13, 2024

December 30, 2022

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USEON TECH LIMITED (CN)

C08L67/02; C08J3/22; C08J5/18; C08J9/12; C08J9/14; C08K5/1539; C08K5/3492; C08L25/14; C08L51/06

BEIJING WEIZHENG PATENT AGENCY CO., LTD. (CN)

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