enting or enhancing materials such as perfume compositions, animal repellents and pheromones and insect repellentcompositions.U.S. Pat. No. 4,156,067 issued on May 22, 1979 (the specification for which is incorporated by reference herein) discloses polyurethane polymers characterized by a molecular weight of above 6,000 and having lactone groups and hydroxyl groups inthe polymer backbone being pre