Patent ID: 7160976

Claim:
Pressure-sensitive adhesive comprising the reaction product of: a) at least one aliphatic or alicyclic diisocyanate having an asymmetrical molecular structure, b) a combination of at least one polypropylene glycol diol and at least one polypropylene glycol triol, the ratio of the number of hydroxyl groups in the diol component to the number of hydroxyl groups in the triol component being between 1.0 and 9.0; the ratio of the number of isocyanate groups to the total number of hydroxyl groups being between 0.9 and 1.1, and the diols end triols alternatively being selected and combined in each case as follows: diols having a molecular weight of less than or equal to 1000 are combined with triols whose molecular weight is greater than 1000, diols having a molecular weight of greater than 1000 are combined with triols whose molecular weight is less than 1000.