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US 2009/0214795 A1Published application
Coating masses comprising 2,4'-diisocyanatodiphenylmethane
AssigneeBASF SE
InventorsCarl Jokisch, Eva Wagner, Harald Schaefer, Thomas Zech, Bernd Bruchmann
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Abstract
The present invention relates to coating compositions which comprise 2,4′-diisocyanatodiphenylmethane, to processes for preparing them, and to their use.
Claims16
1-17. (canceled)
18:
- A coating composition comprising
- (a) a mixture of 2,4′-diisocyanatodiphenylmethane (MDI) and 4,4′-diisocyanatodiphenylmethane (MDI), and 2,2′-diisocyanatodiphenylmethane (MDI), comprising the 2,4′-MDI isomer to an extent of at least 90% by weight,
- (b) at least one other di- or polyisocyanate,
- (c) at least one compound having at least two isocyanate-reactive groups,
- (d) at least one further compound having an isocyanate-reactive group,
- (e) at least one solvent,
- the ratio of isocyanate groups (a) to isocyanate-reactive groups from (c) and (d) amounting (in toto) to less than 1.05:1
- and, if at least one compound (b) is present, the ratio of isocyanate groups in (a) and (b) (in toto) to isocyanate-reactive groups from (c) and (d) (in toto) amounting to not more than 1.3:1.
5 more elements
19:
- The coating composition according to claim 18, wherein component (c) is selected from the group consisting of polyesterols, polyetherols, and polyacrylate polyols.
20:
- The coating composition according to claim 18, wherein at least part of component (a) is an isocyanate group-containing urethane from the reaction of 2,4′-MDI with at least one n-valent diol or polyol (c1), it being possible for n to adopt values from 2 to 6.
21:
- The coating composition according to claim 20, wherein n adopts values from 3 to 6.
22:
- The coating composition according to claim 20, wherein the n-valent diol or polyol (c1) has a molar mass of up to 400 g/mol.
23:
- The coating composition according to claim 18, wherein at least one component (b) is present.
24:
- The coating composition according to claim 18, wherein component (a) at least partly comprises monomeric 2,4′-MDI.
25:
- The coating composition according to claim 18, wherein at least part of component (d) is a polyether alcohol of the formula
- R5—O—[—Xi—]k—H
- in which
- R5 is as defined above,
- k is an integer from 5 to 40, preferably 7 to 45, and more preferably 10 to 40, and
- each Xi, independently of one another for i=1 to k, may be selected from the group —CH2—CH2—O—, —CH2—CH(CH3)—O—, —CH(CH3)—CH2—O—, —CH2—C(CH3)2—O—, —C(CH3)2—CH2—O—, —CH2—CHVin-O—, —CHVin-CH2—O—, —CH2—CHPh—O—, and —CHPh—CH2—O—, preferably from the group —CH2—CH2—O—, —CH2—CH(CH3)—O—, and —CH(CH3)—CH2—O—, and more preferably —CH2—CH2—O—
- in which Ph is phenyl and Vin is vinyl.
4 more elements
26:
- The coating composition according to claim 18, wherein at least part of component (d) is a compound of the formula
- RG-R3-DG
- in which
- RG is at least one isocyanate-reactive group,
- DG is at least one dispersive group, and
- R3 is an aliphatic, cycloaliphatic or aromatic radical comprising 1 to 20 carbon atoms.
3 more elements
27:
- The coating composition according to claim 18, wherein at least part of component (d) is at least one compound having an isocyanate-reactive group and at least one free-radically polymerizable unsaturated group.
28:
- The coating composition according to claim 27, wherein at least part of component (d) is 2-hydroxyethyl (meth)acrylate, 2- or 3-hydroxypropyl (meth)acrylate, 1,4-butanediol mono(meth)acrylate, neopentyl glycol mono(meth)acrylate, 1,5-pentanediol mono(meth)acrylate, 1,6-hexanediol mono(meth)acrylate, glycerol di(meth)acrylate, trimethylolpropane monodi(meth)acrylate, pentaerythritol tri(meth)acrylate, and 4-hydroxybutyl vinyl ether, 2-aminoethyl (meth)acrylate, 2-aminopropyl (meth)acrylate, 3-aminopropyl (meth)acrylate, 4-aminobutyl (meth)acrylate, 6-aminohexyl (meth)acrylate, 2-thioethyl (meth)acrylate, 2-aminoethyl(meth)acrylamide, 2-aminopropyl(meth)acrylamide, 3-aminopropyl(meth)acrylamide, 2-hydroxyethyl(meth)acrylamide, 2-hydroxypropyl(meth)acrylamide or 3-hydroxypropyl(meth)acrylamide.
29:
- A process for preparing a coating composition comprising 2,4′-diisocyanatodiphenylmethane, by
- initially introducing a mixture of 2,4′-diisocyanatodiphenylmethane (MDI) and 4,4′-diisocyanatodiphenylmethane (MDI), and, if appropriate, 2,2′-diisocyanatodiphenylmethane, in at least one solvent, and
- adding thereto at least one n-valent diol or polyol (c1), n being able to adopt values from 2 to 6, and simultaneously or subsequently adding at least one binder (c2).
30:
- A method of coating a substrate, which comprises mixing isocyanate group-containing components and the components having isocyanate-reactive groups, and, if appropriate, other, typical coatings additives with one another to give a coating composition according to claim 18 and applying the mixture within a period of not more than 12 hours after mixing to the substrate, and thereafter carrying out drying and curing.
31:
- The method of using a mixture of 2,4′-diisocyanatodiphenylmethane (MDI) and 4,4′-diisocyanatodiphenylmethane (MDI), and 2,2′-diisocyanatodiphenylmethane, in which the 2,4′-MDI isomer is comprised to an extent of at least 90% by weight, in a coating composition for coating wood, wood veneer, paper, board, card, textile, leather, nonwoven, plastics surfaces, glass, ceramic, mineral building materials, or metals, including coated metals.
32:
- The method of using a mixture of 2,4′-diisocyanatodiphenylmethane (MDI) and 4,4′-diisocyanatodiphenylmethane (MDI), and, if appropriate, 2,2′-diisocyanatodiphenylmethane, in which the 2,4′-MDI isomer is comprised to an extent of at least 90% by weight, in a transparent coating material for coating paper surfaces or wood surfaces.