Dow Global Technologies LLC ;Rohm and Haas Company
发明人:
Bardman James Keith,DeRocher Jonathan,Hejl Andrew,Van Dyk Antony K.,Wang Lin,Yeung Kimy
申请号：
US201815968939
公开号：
US2018320007(A1)
申请日:
2018.05.02
申请国别(地区):
美国
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 ti
