Adhesives with low VOC and fogging values
The invention relates to hotmelt adhesives based on polyesters, having low VOC and fogging values. In particular, the invention relates to reactive hotmelt adhesives including polyesters containing at least 50 mole percent, based on the polycarboxylic acid components, of terephthalic acid or a derivative thereof and containing at least 40 mole percent, based on the polyol components, of diols of the formula HO—(CH 2 ) x —OH with x≥6.
1. A reactive hotmelt adhesive comprising a polyester containing at least 50 mole per cent, based on the polycarboxylic acid components, of terephthalic acid or a derivative thereof and containing at least 40 mole per cent, based on the polyol components, of diols of the formula HO—(CH 2 ) x —OH with x ≥6, wherein the number-average molecular weight of the polyester is from 500 to 30,000 g/mol; wherein the polyester has a melting point of greater than 23° C., a sum of individual enthalpies of fusion in the first heating curve of 5 to 130 J/g, and a glass transition temperature of from −80° C. to 0° C.
2. The reactive hotmelt adhesive according to claim 1 , wherein hexanediol, nonanediol, decanediol and dodecanediol are used as diols of the formula HO—(CH 2 ) x —OH, and wherein the number-average molecular weight of the polyester is from 1,000 to 20,000 g/mol.
3. The reactive hotmelt adhesive according to claim 1 , wherein the reactive hotmelt adhesive has a VOC value which does not exceed 100 μg/g and a FOG value which is not higher than 250 μg/g.
4. An adhesive bond comprising the reactive hotmelt adhesive according to claim 3 , wherein the number-average molecular weight of the polyester is from 1,000 to 20,000 g/mol, and wherein the reactive hotmelt adhesive has a VOC value from 3 μg/g to 10 μg/g and a FOG value of from 15 to 138 μg/g.
5. A wood product comprising the adhesive bond according to claim 4 .
6. A sealant comprising the reactive hotmelt adhesive according to claim 3 .
7. The adhesive bond according to claim 4 , wherein the reactive hotmelt adhesive are used in one-pack or two-pack systems.
8. A coating material comprising the reactive hotmelt adhesive according to claim 3 .
9. A furniture product comprising the reactive hotmelt adhesive according to claim 3 .
10. An automobile or automobile component comprising the reactive hotmelt adhesive according to claim 3 .
11. A shoe or shoe component comprising the reactive hotmelt adhesive according to claim 3 .
12. A textile or textile component comprising the reactive hotmelt adhesive according to claim 3 .
13. A window or window component comprising the reactive hotmelt adhesive according to claim 3 .
14. A coating material comprising the adhesive bond according to claim 4 .
15. A furniture product comprising the adhesive bond according to claim 4 .
16. An automobile or automobile component comprising the adhesive bond according to claim 4 .
17. A shoe or shoe component comprising the adhesive bond according to claim 4 .
18. A textile or textile component comprising the adhesive bond according to claim 4 .
19. A window or window component comprising the adhesive bond according to claim 4 .
20. The reactive hotmelt adhesive according to claim 3 , wherein hexanediol, nonanediol, decanediol and dodecanediol are used as diols of the formula HO—(CH 2 ) x —OH.