Aqueous dispersions
The invention concerns hydrous compositions based on polychloroprene and hydroxylamine derivatives, processes for their production and their use as adhesives. The polychloroprene dispersions are stabilized by the addition of hydroxyalkylamine after removal of residual monomer.
1. Aqueous polymer dispersion free from residual monomer and comprising:
A) polychloroprene particles and
B) hydroxylamine derivatives having the general formula (I)
in which the radicals
R 1 and R 2 each independently stand for hydrogen (H), linear or branched, saturated or unsaturated, unsubstituted, monosubstituted or polysubstituted C 1 to C 20 alkyl radicals or C 6 to C 12 aryl radicals or C 7 to C 14 aralkyl radicals or C 5 to C 7 cycloalkyl radicals and R 1 and R 2 are optionally joined together by an unsubstituted, monosubstituted or polysubstituted C 3 to C 7 cycloalkyl radical.
2. Aqueous polymer dispersion according to claim 1 , containing 0.05 to 2 wt. %, based on the solids content of the dispersion, of hydroxylamine derivatives (B).
3. Aqueous polymer dispersion according to claim 1 , containing 0.1 to 1.0 wt. %, based on the solids content of the dispersion, of hydroxylamine derivatives (B).
4. Aqueous polymer dispersion according to claim 1 , wherein N,N-diethyl hydroxylamine and/or N-isopropyl hydroxylamine are used as the hydroxylamine derivatives (B).
5. Adhesive and sealant formulations containing aqueous polymer dispersions according to claim 1 .
6. Substrates coated with adhesive formulations according to claim 5 .
7. Polymer coatings obtained from aqueous polymer dispersions according to claim 1 .
8. Substrates bonded together with coatings according to claim 7 .
9. A process for preparing an aqueous polychloroprene dispersion comprising the steps of 1) polymerizing monomeric polychloroprene; 2) removing residual monomers and other volatile constituents by distillation; and 3) adding a hydroxyalkylamine of formula (I):
in which the radicals
R 1 and R 2 each independently stand for hydrogen (H), linear or branched, saturated or unsaturated, unsubstituted, monosubstituted or polysubstituted C 1 to C 20 alkyl radicals or C 6 to C 12 aryl radicals or C 7 to C 14 aralkyl radicals or C 5 to C 7 cycloalkyl radicals or R 1 and R 2 are joined together by an unsubstituted, monosubstituted or polysubstituted C 3 to C 7 cycloalkyl radical.
10. A method of stabilizing an aqueous polychloroprene dispersion comprising the step of adding a hydroxyalkylamine of formula (I):
in which the radicals
R 1 and R 2 each independently stand for hydrogen (H), linear or branched, saturated or unsaturated, unsubstituted, monosubstituted or polysubstituted C 1 to C 20 alkyl radicals or C 6 to C 12 aryl radicals or C 7 to C 14 aralkyl radicals or C 5 to C 7 cycloalkyl radicals or R 1 and R 2 are joined together by an unsubstituted, monosubstituted or polysubstituted C 3 to C 7 cycloalkyl radical,
after creation of the dispersion and removal of the residual monomer.