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Hydrophobically modified ethoxylated urethanes

Hydrophobically Modified, Ethoxylated Urethane. HEUR associative thickeners are in effect poly(oxyethylene) polymers that contain terminal hydrophobe units (66). They can be synthesized via esterification with monoacids, tosylation reactions, or direct reaction with monoisocyanates. There are problems associated with all of the methods of synthesis. The general commercial procedure for their synthesis is by a step-growth addition of... [Pg.321]

Nonionics (e.g., hydrophobically modified ethoxylated urethanes, HEUR ... [Pg.115]

During these developments, hydrophobically modified ethoxylated urethane (HE UR) thickeners were synthesized and patented (6, 7). Their application in coatings was discussed, but the emphasis was on improved barrier properties (8), not on rheological influences. The HEUR polymers of the... [Pg.152]

Hydrophobically modified, ethoxylated urethanes (HEURs) are the thickeners of choice in exterior coatings and in corrosion-resistant, high-gloss industrial latex finishes. This chapter presents an overview of our research efforts and discusses approaches to the synthesis of HEUR polymers with different molecular architectures, geometrical influences on solution properties, and viable mechanisms by which this class of associative thickener effects desirable coatings rheology and applied film properties. [Pg.496]

Finally, by way of illustration, we mention a polymer type currently receiving much attention. The polymer is referred to as hydrophobically modified ethoxylated urethane (HEUR), the reaction product of a PEG and a diisocyanate, end-capped with a long chain alcohol or amine. HEURs are already recognized as having much potential as associative thickeners in coating formulations. Their structure suggests they will show pronounced interaction with surfactants in solution and this is indeed the case. Here we refer to two recent studies. The first by Hulden (95) included surface tension studies of the polymer... [Pg.221]

Figure 31 Generalized structure of hydrophobically modified ethoxylated urethanes (HEURs). Figure 31 Generalized structure of hydrophobically modified ethoxylated urethanes (HEURs).
Glass JE (1999) Adsorption of hydrophobically modified, ethoxylated urethane thickeners on latex and titanium dioxide disperse phases. Adv Colloid Interface Sci 79 123-148... [Pg.250]

Associative thickeners increase the viscosity of the paint by interacting with other paint ingredients through bridging of particles (surface to surface) or interaction of adsorbed layers. The interactions are assumed to be through hydrophobic forces. The operative mechanism is illustrated in Figure 5.9. Important groups in this class are associative acrylic thickeners, associative cellulose ethers and hydrophobically modified ethoxylated urethanes (HEUR). [Pg.247]

Hydrophobically modified ethoxylated urethane thickeners, also known as polyurethane thickeners, are a more recent type of asso-... [Pg.249]

See other pages where Hydrophobically modified ethoxylated urethanes is mentioned: [Pg.494]    [Pg.320]    [Pg.115]    [Pg.31]    [Pg.494]    [Pg.320]    [Pg.184]    [Pg.127]    [Pg.161]    [Pg.459]    [Pg.491]    [Pg.495]    [Pg.495]    [Pg.497]    [Pg.499]    [Pg.501]    [Pg.503]    [Pg.505]    [Pg.507]    [Pg.509]    [Pg.511]    [Pg.513]    [Pg.515]    [Pg.517]    [Pg.519]    [Pg.521]    [Pg.523]    [Pg.525]    [Pg.528]    [Pg.543]    [Pg.544]    [Pg.31]    [Pg.140]    [Pg.98]    [Pg.261]    [Pg.249]    [Pg.250]   
See also in sourсe #XX -- [ Pg.247 , Pg.249 ]



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Ethoxylated

Ethoxylated urethanes, hydrophobically

Ethoxylates

Ethoxylation

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