Latent curing agent and curable polyurethane composition

Patent metadata

Field	Value
Publication number	US-11535694-B2
Application number	US-201816613888-A
Country	US
Kind code	B2
Filing date	Jun 19, 2018
Priority date	Jun 19, 2017
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

A compound of formula (I) having advantageous properties when used as a latent curing agent for compositions containing isocyanate groups, and to compositions containing the compound of formula (I). The compound of formula (I) is odourless, is liquid and has comparatively low viscosity at room temperature and is stable in storage together with isocyanates. It makes possible odourless single-component polyurethane compositions which have good stability in storage, do not produce bubbles when cured in the presence of moisture, and cause no problematic odour emissions, giving a cured elastic material having good mechanical properties, good heat stability, a surprisingly non-adhesive surface and little tendency towards plasticizer migration.

First claim

The invention claimed is:

1. A composition comprising
at least one compound of formula (I) and
at least one polyisocyanate and/or at least one polyurethane polymer containing isocyanate groups; wherein
the least one compound of the formula (I) is

where
n is 1, 2 or 3,
Z is an aryl radical substituted by an alkyl or alkoxy group and having a total of 12 to 26 carbon atoms,
A is an n-valent organic radical having a molecular weight in the range from 15 to 10,000 g/mol,
X is O or S or NR 0 where R 0 is a monovalent organic radical having 1 to 18 carbon atoms, and
Y is a 1,2-ethylene or 1,3-propylene radical which is optionally substituted, where A and Y in the case that n =1 may also be bonded to a trivalent radical having 4 to 10 carbon atoms.

2. The composition as claimed in claim 1 , wherein it is an adhesive or a sealant or a coating.

3. The composition as claimed in claim 1 , wherein the composition is odorless.

4. The composition as claimed in claim 1 , wherein the at least one compound of formula (I) is obtained from a reaction of at least one amine of the formula (III) with at least one aldehyde of the formula (IV)

in a condensation reaction with removal of water, where A, n, X, Y and Z have the same definitions as provided above.

5. The composition as claimed in claim 1 , wherein Z is the aryl radical substituted by an alkyl group and having a total of 12 to 26 carbon atoms.

6. The composition as claimed in claim 1 , wherein Z is a radical of the formula (II)

where R is a branched alkyl radical having 8 to 12 carbon atoms.

Assignees

• Sika Tech Ag

Inventors

• Burckhardt Urs
• Kramer Andreas

Classifications

• C08G18/4829

  Polyethers containing at least three hydroxy groups (C08G18/4833 - C08G18/5096 take precedence) · CPC title

• C08G18/485

  containing mixed oxyethylene-oxypropylene or oxyethylene-higher oxyalkylene end groups · CPC title

• C08G18/7671 Primary

  containing only one alkylene bisphenyl group · CPC title

• C08G18/4812

  Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy groups · CPC title

• C09K3/1021

  Polyurethanes or derivatives thereof · CPC title