ACETOACETYL-FUNCTIONAL SILICON-BASED RESIN AND PROCESS FOR PREPARING THE SAME

摘要

An acetoacetyl-functional silicon-based resin includes at least a fraction with a branched molecular skeleton containing silicon atoms and acetoacetyl functional groups chemically bonded to the branched molecular skeleton. The acetoacetyl functional silicon-based resin can be used to formulate coating compositions.

主权项

1. A process for the preparation of an acetoacetyl functional silicon-based resin, the process comprising:
i) reacting a silane compound having three or more condensable functionalities with at least a polyol in excess by condensation, thereby forming a silicon-based resin; and ii) functionalizing the silicon-based resin with an acetoacetyl functional compound, to form the acetoacetyl functional silicon-based resin, wherein at least portion of the acetoacetyl functional silicon-based resin has the following structure of Formula (II):wherein,X1, X2, X3 and X4 are independently, at each occurrence, selected from —O—XA—O—U, —O—XB—O—U, —O—XC—O—U,with Y1 and Y2 being independently, at each occurrence, selected from the group consisting of —O—XA—O—U, —O—XB—O—U and —O—XC—O—U;XA, XB and XC are independently, at each occurrence, selected from the group consisting of —CH2—CH2—,U represents independently, at each occurrence, H orwith not all of Us being H;n represents independently, at each occurrence, an integer from 1 to 10; andk represents independently, at each occurrence, an integer from 1 to 10.