Urethane oligomers

There are two approaches to forming urethane-acrylic hybrids. First, an acrylate terminated urethane oligomer can be used [147]. Alternatively, polyisocyanate and benzoyl peroxide can be combined in one side of the adhesive, and methacrylate monomers and urethane curatives (especially polyols) in the other [148]. 

Applications Applications of SEC-FTIR include quantitative analysis of copolymers [701] product deformulation of hot melt adhesives characterisation of polymer compositional heterogeneity analysis of complex mixtures of urethane oligomers and eventually also the identification and quantitative analysis of polymer additives... 

Type I Urea-Urethane Oligomers. To 30g (0.5 mole) ethylene diamine and lOg dimethoxy ethane in a three-neck flask equipped with an overhead stirrer was added over a one-hour period, 185g (0.5 mole) of butanol half-blocked dllsocyanate. After the addition, the reaction was stirred overnight at room temperature. 

Type II Urea-Urethane Oligomers. To 11.6g (0.1 mole) of melted 1,6-hexanediamine was added 76.9g of t-butanol half-blocked isophorone diisocyanate. During about a 30-minute addition, the temperature rose to 50-60°C. After an additional one hour of heating at 50-60°C, the oligomer solution was thinned with 40g of 2-hexoxy-ethanol. 

An example of the elastomeric component is a combination of multifrmctional and difunctional aliphatic urethane oligomers. Suitable oligomers have relatively high molecular weights and glass transition temperatures (Tg), which enables the adhesive to have elastic properties at room temperature. Its deformability under... 

Several poly(urea urethane) oligomers 28 (Figure 12) were prepared by one-component polycondensation of iV-(hydroxyalkyl)-2 -oxo-1,3-diazepane-l-carboxamides, which act as intramolecular blocked isocyanates <2005PLM 1459>. These oligomers are semicrystalline materials and their melting points show the odd/even effect observed earlier for [ ]-polyamides, [ ]-polyurethanes, poly(ester amide)s, and poly (amide urethane)s. Further analysis showed that the polymers are stable up to ca. 205-230 °C, the polymers with the lower number of methylene groups in the amino alcohol decomposing at the lowest temperature. 

Liquid photo-sensitive acrylated urethane oligomer... 

Figure 1. Effect of acrylo- urethane oligomer (MW 6000) level on percent add-on of polyester/cotton, 50/50 fabric at various depths of engraving 2.5% Graphtol...

Figure 7. Effect of Cab-O-Sil level on sharpness ratings of fabrics at various depths of engraving 15% acrylo-urethane oligomer, P/C 50/50, Graphtol Blue 6825. (HJ 3 mil 6% pigment (A) 2 mil 6% pigment (9) 1 mil 6% pigment (Q) 3 mil 2.5% pigment (A) 2 mil 2.5% pigment (0)1 mil 2.5% pigment.

Figure 8. Effect of percent add-on on skinniness ratings of polyester/cotton, 50/50 fabrics at various acrylo-urethane oligomer (MW 6000) levels 2.5% Graphtol Blue 6825. Oligomer (O) 0% (9) 15% (A) 30% (A) 45%.

Figure 10. Effect of Cab-O-SU level on skinniness ratings of fabrics at various depths of engraving 15% acrylo-urethane oligomer, 2.5 Graphtol Blue 6825,...

Figure 12. Comparison of print quality (sharpness and skinniness ratings) of polyester/cotton, 50/50 fabrics printed with radiation-curable system (2.5% Graphthol Blue 6825, 15% acrylo-urethane oligomer (MW 6000), 79.5% monomer mixture and 3% Cab-O-Sil) and all aqueous systems Skinniness rating—...

The principal members of the Uvimer series are uniquely designed unsaturated urethanated oligomers. One method of Incorporating unsaturated functionality Is by reaction of pendant Isocyanate groups with unsaturated compounds containing active hydrogen (See, e.g.. Ref. 1). 

Urethane Oligomer E, parts 2-Ethylhexyl acrylate Hydroxyethyl acrylate 2-Ethoxyethyl acrylate... 

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