Polyurethane two-component or multi-component systems having a latent thickening tendency

Patent metadata

Field	Value
Publication number	US-2017158838-A1
Application number	US-201515320611-A
Country	US
Kind code	A1
Filing date	Jun 23, 2015
Priority date	Jun 24, 2014
Publication date	Jun 8, 2017
Grant date	—

Abstract

The invention relates to a two-component or multi-component system comprising: at least one polyol component 1 that has i) at least one polyol, ii) at least one inorganic thickener (a1), and iii) at least one wetting and dispersing agent (a2) which inhibits the thickening effect of said inorganic thickener (a1); as well as at least one polyisocyanate component 2 that comprises i) at least one polyisocyanate; where (A) either the polyisocyanate component 2 comprises at least one component (b1) that at least partially cancels the inhibition of the thickening effect of the inorganic thickener (a1); and/or (B) at least one isocyanate-free component 3 comprises at least one component (b1) that at least partially cancels the inhibition of the thickening effect of the inorganic thickener (a1); said wetting and dispersing agent (a2) being non-reactive to the at least one polyol, and the polyisocyanate component 2 being reactive to the polyol component 1. The invention also relates to a substrate coated with a system according to the invention, and to the use of at least one inorganic thickener (a1) and at least one wetting and dispersing agent (a2) which inhibits the thickening effect of said inorganic thickener (a1), in order to provide a latent thickening effect for a composition that contains at least one polyol.

First claim

1 . A two-component or multicomponent system comprising at least one polyol component 1 which comprises
i. at least one polyol, ii. at least one inorganic thickener (a1), and iii. at least one wetting and dispersing agent (a2) which inhibits the thickening effect of the inorganic thickener (a1);
and
at least one polyisocyanate component 2 which comprises i. at least one polyisocyanate; and (A) either the polyisocyanate component 2 comprising at least one component (b1) which at least partly eliminates the inhibition of the thickening effect of the inorganic thickener (a1); and/or (B) at least one isocyanate-free component 3 comprising at least one component (b1) which at least partly eliminates the inhibition of the thickening action of the inorganic thickener (a1); and the wetting and dispersing agent (a2) being nonreactive toward the at least one polyol and the polyisocyanate component 2 being reactive toward the polyol component 1.

2 . The two-component or multicomponent system as claimed in claim 1 , the inorganic thickener (a1) being selected from the group consisting of phyllosilicates, precipitated silicas, and fumed silicas.

3 . The two-component or multicomponent system as claimed in claim 1 , the inorganic thickener (a1) being non-organically modified fumed silica or hydrophobically modified fumed silica.

4 . The two-component or multicomponent system as claimed in claim 1 , the inorganic thickener (a1) being a phyllosilicate mixture which has been surface-treated with quaternary alkylammonium salts and which comprises 50 to 95 wt %, based on the phyllosilicate mixture, of a clay mineral selected from the group consisting of sepiolite and palygorskite or mixtures thereof and less than 50 wt %, based on the phyllosilicate mixture, of at least one smectite.

5 . The two-component or multicomponent system as claimed in claim 1 , the polyol of the polyol component 1 being selected from the group of the polyester polyols, polyether polyols and monomeric molecularly uniform polyols.

6 . The two-component or multicomponent system as claimed in claim 1 , the polyisocyanate component 2 comprising a polyisocyanate which is selected from the group consisting of aromatic diisocyanates, cycloaliphatic diisocyanates, araliphatic diisocyanates, aliphatic diisocyanates, mixtures thereof, and uretdiones, isocyanurates and/or biurets of the diisocyanates or the mixtures of the diisocyanates.

7 . The two-component or multicomponent system as claimed in claim 1 , the wetting and dispersing agent (a2) and the component (b1) being selected such that they comprise one or more of the following functional groups selected from
group 1: consisting of
imidazolyl groups, with the structural element N-C═N,
amino groups with the structural elements N for tertiary amines, NH for secondary amines, and NH 2 for primary amines, and
ammonium groups with the structural element NH + X − for ammonium salts of tertiary amines, with the structural element NH 2 + X − for ammonium salts of secondary amines, and NH 3 + X − for ammonium salts of primary amines, X − in each case being the anion of an acid;
and/or group 2: consisting of
hydroxyl groups with the structural element OH,
urea groups with the structural element HNC(O)CNH for ureas of primary amines and NC(O)CN for ureas of secondary amines,
amide groups, with the structural element C(O)N for amides of secondary amines, C(O)NH for amides of primary amines, and C(O)NH 2 for amides of ammonia,
carboxylic acid groups with the structural element COOH, and
organic phosphoric ester groups with the structural element OP(O)(OH) 2 ,
and (A) the weight percentage fraction of structural elements in the wetting and dispersing agent (a2), selected from the functional groups of groups 1 and 2, based on the weight of the wetting and dispersing agent (a2), being lower than the weight percentage fraction of structural elements in component (b1), selected from the functional groups of groups 1 and 2, based on the weight of the component (b1); and/or (B) component (b1) comprising a higher weight percentage fraction of structural elements from the functional groups selected from group 1, based on the weight of component (b1), than that of the structural elements from the functional groups selected from group 1 in the wetting and dispersing agent (a2), based on the weight of the wetting and dispersing agent (a2).

8 . The two-component or multicomponent system as claimed in claim 7 ,
(A) the weight percentage fraction of structural elements selected from the functional groups of groups 1 and 2, based on the weight of the wetting and dispersing agent (a2), being less than 11 wt %, and the weight percentage fraction of structural elements selected from the functional groups of groups 1 and 2, based on the weight of component (b1), being greater than or equal to 11 wt %.

9 . The two-component or multicomponent system as claimed in claim 7 , the difference in the weight percentage fractions of structural elements between the wetting and dispersing agent (a2) and component (b1) being at least 2 wt %.

10 . The two-component or multicomponent system as claimed in claim 1 , the weight ratio of wetting and dispersing agent (a2) to component (b1) being 15:1 to 1:5.

11 . The two-component or multicomponent system as claimed in claim 1 , the wetting and dispersing agent (a2) binding reversibly to the surface of the inorganic thickener (a1).

12 . The two-component or multicomponent system as claimed in claim 1 , the polymer (b1) being able to bind to the surface of the inorganic thickener (a1) with at least partial displacement of (a2).

13 . The two-component or multicomponent system as claimed in claim 1 , being an adhesive, sealant, a coating material or a molding compound.

14 . A substrate coated with a two-component or multicomponent system of claim 1 .

15 . A method of utilizing at least one inorganic thickener (a1) and at least one wetting and dispersing agent (a2) which inhibits the thickening effect of the inorganic thickener (a1) to provide a formulation comprising at least one polyol with a latent thickening effect.

Assignees

• Byk Chemie Gmbh

Inventors

• Piestert Frederik
• Pritschins Wolfgang
• Kockoth Sascha
• Omeis Jürgen

Classifications

• C09D175/06

  from polyesters · CPC title

• C08G18/7671

  containing only one alkylene bisphenyl group · CPC title

• C09D7/002

  Chemistry & Metallurgy · mapped topic

• C08K9/04

  Ingredients treated with organic substances {(treated with macromolecular compounds C08K9/08)} · CPC title

• C08G18/675

  Low-molecular-weight compounds · CPC title