Low-viscosity oligocarbonate polyols
View Patent ↗The present invention relates to low-viscosity oligocarbonate polyols, their preparation and use. The oligocarbonate polyols are based on diols of formula I below, which are used in combination with a further aliphatic polyol.
1. A transparent coating comprising aliphatic oligocarbonate poiyois having a number-average molecular weight (M n ) of 500 to 10,000 g/mol and which are prepared from
a polyol component containing
1 to 99 mol % of a diol of formula (I)
wherein
n is an integer from 1 to 50;
m is an integer from 1 to 20;
R 1 and R 2 are, independently of one another, an optionally unsaturated, linear, cyclic, or branched C 1 - to C 20 -alkyl radical;
(X)m is a carbon-containing group having 1 to 20 carbon atoms and whose chain may also be interrupted by heteroatoms such as oxygen, sulphur or nitrogen; and
at least one further aliphatic polyol;
wherein the amounts of said diol of formula (I) and said at least one further aliphatic polyol total 100 mol % of said polyol component.
2. The transparent coating of claim 1 , wherein said transparent coating is a polyurethane coating.
3. The transparent coating of claim 2 , wherein said polyurethane coating is prepared from an isocyanate or a polyisocyanate.
4. The transparent coating of claim 3 , wherein said polyisocyanate is prepared by modifying simple aliphatic, cycloaliphatic, araliphatic, and/or aromatic dilsocyanates which comprise at least two diisocyanates having a uretdione, isocyanurate, allophanate, biuret, iminooxadiazinedione, and/or oxadiazinetrione structure.
5. The transparent coating of claim 4 , wherein said polyisocyanate comprises an isocyanurate structure and is based on HDI, IPDI, and/or 4,4′diisocyanatodicyclohexylmethane.
6. The transparent coating of claim 3 , wherein said polyisocyanate is blocked.
7. The transparent coating of claim 1 , wherein said transparent coating is prepared using a catalyst.
8. The transparent coating of claim 3 , wherein said transparent coatings are further prepared from polyisocyanate-reactive compounds selected from the group consisting of polyether poiyois, polyester polyols, polyacrylate polyols, polyamines, and aspartates.
9. The transparent coating of claim 3 , wherein said transparent coatings are prepared with an equivalent ratio of NCO to OH groups in the range of from 0.3 to 2.
10. The transparent coating of claim 1 , wherein said transparent coatings are prepared by curing at temperature in the range of from 20° C. to 200° C.