Abstract
A series of polyisocyanates was prepared from di‐isocyanates and polyols with various backbones. These were applied to wool and cured, and the shrink‐resist properties were evaluated. Polyisocyanates with polybutadiene or polycaprolactone backbones showed better resistance to oxidative degradation and conferred more effective shrink resistance than those with polyether backbones. Polyethers containing more than 10% ethylene oxide units were unsatisfactory. The effectiveness of the shrink resistance was related to the extent of urea formation during moisture curing, which was in turn related to the hydrophobic nature of the backbone.
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