Patent ID: 7794814

Claim:
A carpet comprising (I) a primary backing, (II) a yarn tufted or woven through the primary backing thereby creating a yarn bundle on the underside of the resulting carpet, and (III) a polyurethane applied to the underside of the carpet thereby adhering the yarn bundle to the primary backing, wherein the polyurethane is the reaction product of a polyisocyanate component and a polyol component containing a mixture of isocyanate-reactive materials of which one or more optionally alkoxylated hydroxymethyl-containing polyester polyols constitute about 25-90% by weight, wherein prior to alkoxylation, the hydroxymethyl-containing polyester polyol(s) having the following average structure: [H—X] (z-p) —R—[X—Z] p (I) wherein R is the residue of an initiator compound having z hydroxyl and/or primary or secondary amine groups, where z is at least two; each X is independently —O—, —NH— or —NR′— in which R′ is an inertly substituted alkyl, aryl, cycloalkyl, or aralkyl group, p is a number from 1 to z representing the average number of [X—Z] groups per hydroxymethyl-containing polyester polyol molecule, Z is a linear or branched chain containing one or more A groups, provided that the average number of A groups per molecule is ≧1.3 times z, and each A is independently selected from the group consisting of A1, A2, A3, A4 and A5, provided that A1 comprises about 20-50 mole-% of the A groups, A2 comprises about 1-65 mole-% of the A groups, A3 comprises about 0.1-10 mole-% of the A groups, A4 comprises about 0-30 mole-% of the A groups, and A5 comprises about 0-7 mole-% of the A groups, and in which A1 is: wherein B is H or a covalent bond to a carbonyl carbon atom of another A group; m is number greater than 3, n is greater than or equal to zero and m+n is from 8 to 22, A2 is: wherein B is as before, v is a number greater than 3, r and s are each numbers greater than or equal to zero with v+r+s being from 6 to 20, A3 is: wherein B, v, each r and s are as defined before, t is a number greater than or equal to zero, and the sum of v, r, s and t is from 5 to 18, A4 is where w is from 10-24, and A5 is where R′ is a linear or branched alkyl group that is substituted with at least one cyclic ether group and optionally one or more hydroxyl groups or other ether groups.