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Dead-end polyisocyanic acid ester

A polyisocyanate and isocyanate-based technology, which is applied in the preparation of isocyanic acid derivatives, polyurea/polyurethane coatings, polyurea/polyurethane adhesives, etc., can solve the problems that coating properties can no longer be obtained

Inactive Publication Date: 2007-01-03
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in many coating systems the desired coating properties can no longer be achieved at these baking temperatures

Method used

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  • Dead-end polyisocyanic acid ester
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  • Dead-end polyisocyanic acid ester

Examples

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[0041] In the preparation of the polyisocyanates according to the invention, it is also possible to use catalysts, cosolvents and other auxiliaries and additives.

[0042] The blocked polyisocyanates of the invention are used as self-crosslinking one-component baking systems. They are added to formulations for the preparation of coatings, paints, inks and other baking systems such as binders for adhesives and elastomers, and as crosslinkers (components) for polyol components.

[0043] As noted above, the polyisocyanates of the present invention are either self-crosslinking polymers or can be used as crosslinking agents for the polyol component. Suitable polyol components which may also be used in admixture include the following:

[0044] Polyhydroxy polyesters, polyhydroxy polyethers, or addition polymers containing hydroxyl groups, examples are the polyhydroxy polyacrylates known per se. These compounds generally have a hydroxyl number of 20-200, preferably 50-130, based on...

Embodiment 1

[0055] Embodiment 1 (preparation of solvent-containing polyisocyanate crosslinking agent)

[0056] 117 g (0.6 equivalents) of 1,6-diisocyanatohexane (HDI) based 1,6-diisocyanatohexane (HDI) with an NCO content of 21.4 wt %, a viscosity of about 3000 mPa.s (23° C.) and a functionality of about 3.5 Polyisocyanates for industrial paints containing isocyanurates (Desmodur  N3300, Bayer AG) was reacted with 98 g (0.6 equivalents) of benzyl tert-butylamine in 215 g of butyl acetate. The temperature rises to about 40°C. The reaction was complete within 2 hours. The blocked NCO value is 5.86%. The blocked isocyanates obtained in this way are used for the production of coating films.

[0057] Desmophen  A 870 (Bayer AG), 70% BA solution 8.9g

[0058] The blocked polyisocyanate of embodiment 1, 50% BA solution 99.8g

[0059] Baysilone  OL 17 (Bayer AG), 10% MPA solution 1.1 g

[0060] Modaflow  (Solutia Inc.), 1% MPA solution 1.1 g

[0061] Tinuvin  292 (Ciba AG, Lamper...

Embodiment 2

[0077] Embodiment 2 (preparation of solvent-containing polyisocyanate crosslinking agent)

[0078]24.7 g (0.07 equivalents) of 1-isocyanato-3,5,5-trimethyl-5-isocyanate having an NCO content of 11.9 wt % and a viscosity (23° C.) of about 600 mPa.s Isocyanurate-containing polyisocyanates for industrial paints based on methylcarboxycyclohexane (isophorone diisocyanate, IPDI) (industrial product Desmodur  Z4470, ex Bayer AG) was reacted with 11.4 g (0.07 equivalents) of benzyl tert-butylamine in 15.5 g of butyl acetate. The temperature rises to about 40°C. The reaction was complete within 2 hours. The blocked NCO value is 5.7%. The blocked isocyanates obtained in this way are used for the production of coating films.

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Abstract

Blocking agents for polyisocyanates and their use in the preparation of blocked polyisocyanates and one-component systems. Blocked polyisocyanates and self-crosslinking one component baking systems are based on formula (I). Blocked polyisocyanates of formula (I) are produced from the reaction of polyisocyanates with secondary amines of formula (II). The blocked polyisocyanates may be used for preparing paints, inks, and other baking systems such as adhesives or elastomers and also as an additive in the vulcanization of rubbers.

Description

[0001] References to related patent applications [0002] This patent application claims priority under 35 U.S.C. §119(a)-(d) to German Patent Application Nos. 10226927.0, 10226931.9, 10226926.2, 10226925.4 and 10226924.6 all filed on June 17, 2002. technical field [0003] The present invention relates to blocking agents for polyisocyanates and their use in the preparation of novel blocked polyisocyanates and, where appropriate, self-crosslinking one-component systems. Background technique [0004] The use of blocking agents for the temporary protection of isocyanate groups has been known for a long time. Blocked polyisocyanates are used to prepare thermoset 1K PU baking systems that are storage stable at room temperature. In this case, the blocked polyisocyanates are mixed, for example, with hydroxyl-containing polyesters, polyacrylates, other polymers, and further constituents of paints and inks, such as pigments, cosolvents or additives. Another way to obtain storage-s...

Claims

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Application Information

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IPC IPC(8): C07C265/08C07C263/16C08G18/80C09D11/00C09D175/04C09J175/04
CPCC09D175/04C08G18/808C08G18/80
Inventor C·居特勒J·马扎内克J·佩措尔德特T·克利马施H·米勒
Owner COVESTRO DEUTSCHLAND AG
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