Polyurethane carpet backings with improved tuft bind

The present invention pertains to tufted carpeting with improved tuft bind and cracking resistance characteristics. More particularly, the present invention pertains to reactive polyurethane formulations which can be used to prepare tufted carpet with improved tuft bind while retaining good carpet feel and resistance to cracking. Improvements in tuft bind and/or elongation of tufted carpet may be achieved by selecting, as components of a tuft bind adhesive, one or more of: i) a polyol component comprising a low or ultra-low unsaturation polyoxypropylene polyol optionally containing up to 30 weight percent oxyethylene moieties, and ii) a chain extender component comprising 2-methyl-1,3-propanediol.