High-tack adhesive, method of its preparation and the use thereof
View Patent ↗Deviation ring for paste, comprising an annular rebound wall for a self-distributing centrifuge, positioned opposite the discharge slot of the centrifuge, the tangent of which is at an angle α of 3 to 60°, as seen over the entire opening width of the discharge slot.
1. A splicing tape for flying splice for joining the end of an old, outgoing reel to the start of a new reel to be introduced to replace it, said splicing tape having an adhesive coated on only one side of a backing, said adhesive comprising at least
a) from 40-70 percent by weight of polyisobutylene and
b) from 30-50 percent by weight of at least one tackifying resin,
wherein
c) the molecular weight distribution, defined as the plot of frequency over the molecular weight of the polyisobutylene features two relative maxima,
d) one relative maxima between a weight average molecular weight M w of 40,000 g/mol and a weight average molecular weight M w of 200,000 g/mol and
e) a second relative maxima between a weight average molecular weight M w of 1.0×10 6 g/mol and a weight average molecular weight M w of 3.5×10 6 g/mol,
and said splicing tape having a cleavable system on a side of the backing opposite the adhesive.
2. Splicing tape according to claim 1 , wherein in the molecular weight distribution the ordinate of the relative maxima which lies between 1.0×10 6 g/mol and 3.5×10 6 g/mol amounts to not more than 25% of the ordinate of the relative maxima which lies between 50,000 g/mol and 200,000 g/mol.
3. Splicing tape according to claim 1 , wherein the polyisobutylene it comprises features in its molecular weight distribution, between its two relative maxima, a relative minimum whose height (frequency) amounts to not more than 60% of the smaller of the two adjacent relative maxima.
4. Splicing tape according to claim 1 , wherein between the abscissae (molecular weights) of the two relative maxima in the molecular weight distribution of the two polyisobutylene grades there is a factor of 50 or more.
5. Splicing tape according to claim 1 , wherein the adhesive comprises
a) from 40 to 70 percent by weight of polyisobutylene,
b) from 25 to 40 percent by weight of a tackifying resin and
c) from 5 to 20 percent by weight of mineral oil.