THERMALLY EXPANDABLE CELLULOSE-BASED MICROSPHERES

• Main Authors: LOPEZ CABEZAS ANA, RUDA MARCUS, LARSSON KRON ANNA, MARTIREZ PAULA, ANDREASSON BO, WIJTMANS ROEL, FROM MALIN
• Format: Patent
• Language: Chinese; English
• Published: 29.06.2021
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The invention relates to thermally expandable microspheres comprising a polymeric shell surrounding a blowing agent-containing hollow core, the polymer shell comprising a carboxylate-functionalised cellulose having a glass transition temperature (Tg) of at least 125 deg C. The invention also relates to a method for preparing such thermally expandable microspheres, comprising mixing an aqueous phase that optionally comprises an emulsifier with an organic phase that comprises an organic solvent, a blowing agent and a carboxylate-functionalised cellulose having a Tg of at least 125 degC, to form a microsphere dispersion. 本发明涉及可热膨胀微球，其包括围绕含发泡剂空心核的聚合物壳，所述聚合物壳包含玻璃化转变温度(Tg)至少为125℃的羧酸酯官能化纤维素。本发明还涉及制备这样的可热膨胀微球的方法，其包括将任选地包含乳化剂的水相与包含有机溶剂、发泡剂和Tg至少为125℃的羧酸酯官能化纤维素的有机相混合以形成微球分散体。