Process for the preparation of alicyclic polyisocyanate

2:

• The polyisocyanate according to claim 1, wherein
• L is a linear or branched aliphatic, cycloaliphatic or aromatic radical having at most 14 carbon atoms, which optionally comprises at least one nitrogen atom and/or at least one oxygen atom, and
• Ra, Rb, Rc are each independently selected from the group consisting of the radicals of formulae (IIa), (IIb), (IIc), (IId), (IIe) and/or (IIf),
• where
• o is 0, 2 or 3, and
• R1, R1′, R2, R2′, R3, R3′, R4, R4′ are each independently selected from the group consisting of H and C1-C10-alkyl.

3:

• The polyisocyanate according to claim 1, wherein
• L is a linear or branched aliphatic or cycloaliphatic radical having at most 14 carbon atoms, which optionally comprises at least one nitrogen atom and/or at least one oxygen atom,
• Ra, Rb, Rc are each independently selected from the group consisting of the radicals of formulae (IIa), (IIb) and/or (IIc),
• where
• R1, R1′, R2, R2′, R3, R3′, R4, R4′ are each independently selected from the group consisting of H, methyl, ethyl and propyl.

4:

• The polyisocyanate according to claim 1, wherein
• k is 2 or 3, and
• m, n are 0, and
• L is a linear or branched aliphatic radical having at most 10 carbon atoms, which optionally comprises at least one nitrogen atom and/or at least one oxygen atom,
• Ra is selected from the group consisting of the radicals of formulae (IIa), (IIb) and/or (IIc):
• where
• R1, R1′, R2, R2′, R3, R3′, R4, R4′ are each independently selected from the group consisting of H, methyl and ethyl,
• wherein at least one radical of R1, R1′, R2, R2′, R3, R3′, R4 or R4′ is methyl or ethyl.

5:

• The polyisocyanate according to claim 1, wherein
• k is 3, and
• m, n are 0, and
• L is a linear or branched aliphatic radical having at most 6 carbon atoms, which optionally comprises at least one oxygen atom,
• Ra is a radical of the formula (IIb):
• where
• R1, R1′, R2, R2′, R3, R3′, R4, R4′ are each independently selected from the group consisting of H, methyl and ethyl,
• wherein at least one radical and at most 3 radicals of R1, R1′, R2, R2′, R3, R3′, R4 or R4′ are methyl or ethyl.

6:

• A polyisocyanate of formula (IV):
• where
• R1, R1′, R2, R2′ are each independently selected from the group consisting of H and methyl, wherein at least one radical and at most two radicals of R1, R1′, R2 or R2′ are methyl, and
• R3, R3′, R4 and R4′ are H.

7:

• A method for preparing the polyisocyanate according to claim 1, the method comprising reacting a reaction mixture comprising components (a) and (b):
• (a) at least one cyclic isocyanate of formulae (IIIa), (IIIb), (IIIc), (IIId), (IIIe) and/or (IIIf):
• where
• o is 0 to 10, and
• R1, R1′, R2, R2′, R3, R3′, R4, R4′ are each independently selected from the group consisting of H, OR5 and unsubstituted or at least monosubstituted C1-C10-alkyl, C5-C12-cycloalkyl, C2-C10-alkenyl and C6-C14-aryl,
• where R5 is C1-C10-alkyl, and
• (b) at least one alcohol having at least two hydroxyl groups, to obtain a composition (C) comprising the polyisocyanate.

9:

• The method according to claim 7, wherein the component (b) is selected from the group consisting of ethylene glycol, 1,1-dimethylethylene glycol, 1,2-propanediol, 1,3-propanediol, 2-methyl-1,3-propanediol, 2-ethyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol, 1,4-butanediol, 2-ethyl-1,4-butanediol, 1,5-pentanediol, 2-methyl-1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 2-ethyl-1,3-hexanediol, 2,4-diethyloctane-1,3-diol, diethylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol, dipropylene glycol, tripropylene glycol, trimethylolethane, trimethylolpropane, trimethylolbutane, ditrimethylolpropane, pentaerythritol, dipentaerythritol, glycerol, cyclohexane-1,2-diol, cyclohexane-1,3-diol, cyclohexane-1,4-diol, 1,1-bis(hydroxymethyl)cyclohexane, 1,2-bis(hydroxymethyl)cyclohexane, 1,3-bis(hydroxymethyl)cyclohexane, 1,4-bis(hydroxymethyl)cyclohexane, 2,2-bis(4-hydroxycyclohexyl)propane, erythritol, threitol, xylitol, adonitol (ribitol), arabitol (lyxitol), sorbitol, mannitol, dulcitol (galactitol), maltitol, isomalt, diglycerol, dimethylolpropane, dipentaerythritol, ribose, arabinose, glucose, mannose, galactose, fructose, pyrocatechol, catechol, hydroquinone, pyrogallol, hydroxyhydroquinone, phloroglucinol, neopentyl glycol hydroxypivalate, triethanolamine, tripropanolamine, 1,3,5-tris(2-hydroxyethyl)cyanuric acid, a polytetrahydrofuran having a molecular weight between 162 and 4500 g/mol, a poly-1,3-propanediol or a polypropylene glycol having a molecular weight between 134 and 2000 g/mol, and a polyethylene glycol having a molecular weight between 238 and 2000 g/mol.