Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1995-10-30
1997-08-12
Lovering, Richard D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
1563317, 2521822, 25218311, 252312, 4284231, 525125, 525127, 525379, 528905, 560157, 560158, 560159, C08L 3900, C08L 7500, C08F 832, C07C27100
Patent
active
056566883
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/EP94/01283 filed Apr. 25, 1994.
The present invention relates to a compound of the formula ##STR2## where A is an n-valent organic radical and n is an integer greater than 1, or a salt thereof.
The present invention furthermore relates to dispersions or solutions of free radical polymers, polycondensates or polyadducts which contain compounds of the formula I.
Copolymers which are used in coating materials or adhesives are often crosslinkable copolymers. As a result of crosslinking, for example, it is possible to obtain protective coatings or adhesive coatings having good elastic properties, high cohesion, ie. internal strength, and high resistance to chemicals and to solvents.
The copolymers are crosslinked in general by adding a crosslinking agent, which reacts with functional groups in the copolymer.
Possible crosslinking agents are, for example, polyisocyanates, which react with hydroxyl or amino groups.
DE-A-35 21 618 discloses corresponding aqueous adhesive formulations in which polyisocyanates dispersed in water are added, as crosslinking agents, to aqueous dispersions of copolymers obtained by free radical polymerization. Similar adhesive formulations are also described in U.S. Pat. No. 4,396,738 and DE-A-31 12 117.
However, the disadvantage of these aqueous formulations is the poor shelf life. Hence, the polyisocyanate may be dispersed in water and mixed with the copolymer only shortly before said polyisocyanate is used as a crosslinking agent.
A longer shelf life can be achieved by reacting the isocyanate groups with blocking agents, for example oximes, caprolactam, phenols or dialkyl maleates. The blocked polyisocyanates obtained undergo hydrolysis in aqueous dispersion only to a minor extent.
DE-A-38 07 555 relates to such a diisocyanate which is blocked with oximes and dispersed in water and is suitable as an additive for polymers dispersed in water.
However, crosslinking reactions occur only after elimination of the blocking agent at above about 130.degree. C.
Aqueous adhesive formulations known to date and containing polyisocyanates as crosslinking agents thus either have a short shelf life and can therefore be used only as a 2-component system or crosslink only at high temperatures.
Aqueous dispersions which have a long shelf life and crosslink at room temperature after removal of the solvent are disclosed in EP-A-3516. These dispersions contain polyhydrazides which react with monomers polymerized in the copolymer and having carbonyl groups.
German Patent Application P 42 19 384.2 discloses oxime ethers as crosslinking agents. EP-A-516 074 describes aminooxy derivatives as crosslinking agents for copolymers containing keto or aldehyde groups.
EP-A-522 306 describes oxime-blocked polyisocyanates as crosslinking agents for carbonyl-containing polymers.
There is in principle a need for further dispersions crosslinking at room temperature, in order to be able to provide alternatives to polyhydrazide crosslinking. Furthermore, these dispersions should have good performance characteristics, for example good adhesion, in particular wet adhesion to a very wide range of substrates.
It is an object of the present invention to provide dispersions or solutions of crosslinkable copolymers, which dispersions or solutions have a long shelf life, contain a crosslinking agent and are crosslinkable at room temperature.
We have found that this object is achieved by the compound defined above, as well as dispersions or solutions which contain this compound.
The compound of the formula I is suitable as a crosslinking agent or adhesion promoter in dispersions or solutions of free radical polymers, polycondensates or polyadducts.
The crosslinking of free radical polymers, polycondensates or polyadducts containing keto or aldehyde groups with crosslinking agents of the formula I takes place on removal of the liquid phase of the dispersion or solution.
In the formula I, A is an n-valent organic radical, preferably an aliphatic or araliphatic hydrocarbon radical of 4 to 20, preferabl
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Database WPI, Derwent Publications, AN 79-619188/34, GB 1550811, Aug. 22, 1979.
Bauer Gerhard
Baumstark Roland
Bott Kaspar
Haeberle Karl
BASF - Aktiengesellschaft
Lovering Richard D.
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