| abstract |
The present invention relates to a tackifier composition comprising: a) between 40 and 80 parts by weight of a binder composition comprising: i) 20 to 40% by weight of at least one silane terminated Polyurethane polymer STP obtained by at least one polyol P, at least one aliphatic polyisocyanate I and at least one organosilane OS1, ii) 4 to 20% by weight of at least one organosilane OS2 and/or organic titanates OT, iii) 0 to 3 wt % of at least one drying agent, iv) 40 to 80 wt % of solvent L1; b) between 0 and 30 wt parts of industrial carbon black; c) between 0 and 1 part by weight of UV marker; d) a solvent L2 sufficient for the sum of a) to d) to be 100 parts by weight; wherein the organosilane OS1 has a secondary amino, mercapto or hydroxyl group on the organic group, and preferably Having two silane groups, at least one silane terminated polyurethane polymer STP is prepared in the absence of organosilane OS2 and at least one polyol P has an average OH functionality of at least 2 and an equivalent weight of up to 500. The tackifier composition according to the invention has a long open time and enables high UV stability of the bond after application. Furthermore, the tackifier composition according to the invention achieves stable adhesion even under very severe environmental conditions, for example under humid, warm or hot conditions. |