Preparation of Soy-Based Adhesive Enhanced by Waterborne Polyurethane: Optimization by Response Surface Methodology

Table 1

Variables and levels used in RSM design.

Coded and uncoded variables	Levels
Factors	−1	0	1
WPU addition level (X1, %)	8	10	12
Temperature (X2, °C)	60	70	80
Time (X3, min)	80	100	120