Use of polyolefin waxes in hot melt compositions
The invention relates to hot melt compositions comprising polyolefin waxes prepared using metallocene catalysts, have a dropping point or ring & ball softening point of between 80 and 165° C., have a melt viscosity, measured at a temperature of 170° C., of between 20 and 40 000 mPa·s, and have a glass transition temperature of not more than −10° C. and also to their use as hot melt adhesives and as binders for producing roadmarkings.
1 . A hot melt composition comprising one or more polyolefin waxes prepared using metallocene catalysts, have a dropping point or ring & ball softening point of between 80 and 165° C., have a melt viscosity, measured at a temperature of 170° C., of between 20 and 40 000 mPa·s, and have a glass transition temperature of not more than −10° C.
2 . The hot melt composition as claimed in claim 1 , wherein the one or more polyolefin waxes have a dropping point or ring & ball softening point of between 90 and 160° C., a melt viscosity, measured at a temperature of 170° C., of between 50 and 30 000 mPa·s, and a glass transition temperature of not more than −20° C.
3 . The hot melt composition as claimed in claim 1 , wherein the one or more polyolefin waxes have a number-average molar mass M n of between 500 and 20 000 g/mol, and a weight-average molar mass M w of between 1000 and 40 000 g/mol.
4 . The hot melt composition as claimed in claim 1 , wherein the one or more polyolefin waxes are propylene homopolymer waxes.
5 . The hot melt composition as claimed in claim 1 , wherein the one or more polyolefin waxes are copolymer waxes of propylene and one or more further monomers selected from the group consisting of ethylene and branched or unbranched 1-alkenes having 4 to 20 carbon atoms and the amount of structural units originating from propylene in the copolymer waxes is from 70 to 99.9% by weight.
6 . The hot melt composition as claimed in claim 1 , wherein the one or more polyolefin waxes are copolymer waxes of ethylene and at least one branched or unbranched 1-alkene having 3 to 20 carbon atoms and the amount of structural units originating from the one or more 1-alkenes in the copolymer waxes is from 0.1% to 30% by weight.
7 . The hot melt composition as claimed in claim 4 , wherein the propylene homopolymer waxes have undergone polar modification.
8 . The hot melt composition as claimed in claim 1 , further comprising one or more substances selected from the group consisting of polyolefin polymers, resins, waxes, plasticizers, polar or apolar polymers, pigments, fillers, stabilizers, and antioxidants.
9 . A hot melt adhesive comprising the hot melt composition as claimed in claim 1 .
10 . The hot melt adhesive as claimed in claim 9 , wherein the one or more polyolefin waxes are present in the hot melt composition in fractions of between 50% and 99% by weight.
11 . The hot melt adhesive as claimed in claim 9 , wherein the one or more polyolefin waxes are present in the hot melt composition in fractions of between 60% and 90% by weight.
12 . A binder for producing roadmarkings comprising a hot melt composition as claimed in claim 1 .
13 . The binder as claimed in claim 12 , wherein the one or more polyolefin waxes are present in the hot melt composition in fractions of between 5% and 99% by weight.
14 . The binder as claimed in claim 12 , wherein the one or more polyolefin waxes are present in the hot melt composition in fractions of between 20% and 90% by weight.
15 . The binder as claimed in claim 12 , wherein the one or more polyolefin waxes are present in the hot melt composition in fractions of between 50% and 99% by weight.
16 . The binder as claimed in claim 1 , wherein the one or more polyolefin waxes are present in the hot melt composition in fractions of between 60% and 90% by weight.
17 . The hot melt composition as claimed in claim 5 , wherein the copolymer waxes of propylene and one or more further monomers selected from the group consisting of ethylene and branched or unbranched 1-alkenes having 4 to 20 carbon atoms waxes have undergone polar modification.
18 . The hot melt composition as claimed in claim 6 , wherein the copolymer waxes of ethylene and at least one branched or unbranched 1-alkene having 3 to 20 carbon atoms have undergone polar modification.