BARDMAN, James Keith,DEROCHER, Jonathan,HEJL, Andrew,VAN DYK, Antony K.,WANG, Lin,YEUNG, Kimy
申请号：
WO2018US30582
公开号：
WO2018204450(A1)
申请日:
2018.05.02
申请国别(地区):
世界知识产权组织国际局
年份:
2018
代理人:
摘要：
The present invention relates to a process for preparing a coatings composition with an open time additive comprising the steps of a) contacting an aqueous dispersion of alkali swellable polymer particles with a rheology modifier and a binder to form a coatings composition with a VOC of less than 50 g/L; and b) neutralizing the alkali swellable particles with a non-volatile base after or upon contact with the rheology modifier and the binder to form swelled multi-staged polymer particles; wherein the alkali swellable polymer particles comprise a shell having a Tg of not greater than 25 °C and an acid functionalized core; and wherein the core-to-shell ratio is in the range of from 1:3.2 to 1:10. The composition arising from the process of the present invention is useful for improving open time, especially for low VOC coatings applications. In another aspect the present invention relates to the preparation of the coatings composition with an open time additive comprising the steps of a) contacting the open tim
