Propargyl amine (PgAm), styrene (Sty), tert-butyl acrylate (tBA), [epsilon]-caprolactone, anisole, methyl ethyl ketone (MEK), methyl amyl ketone (MAK), toluene, N,N-dimethyl formamide (DMF), Na[N.sub.3], tin 2-ethyl hexanoate, dibutyl tin dilaurate (DBTDL), copper bromide (CuBr), N,N,N',N',N'-pentamethyldiethylenetriamine (PMDETA), and methyl-2-bromopropionate (MBP) were purchased from Aldrich (St.
Table 1: Formulation of the PU coatings using the novel PS- and PrBA- based diols Coating name Diol (g) Acrylic Polyisocyanate MAK polyol (g) (g) (g) PU-PS-PCAP-3% PS-PCAP (0.162) 1.45 0.378 1 PU-PS-PCAP-5% PS-PCAP (0.27) 1.42 0.378 1 PU-PS-PCAP-8% PS-PCAP (0.432) 1.38 0.378 1 PU-PSA-PCAP-3% PtBA-PCAP (0.125) 1.45 0.378 1 PU-PtBA-PCAP-5% PtBA-PCAP (0.205) 1.42 0.378 1 PU-PtBA-PCAP-8% PtBA-PCAP (0.324) 1.38 0.378 1 PU-Pg-PCL-5% Control Pg-PCL (0.12) 1.42 0.378 1 PU-Control - 1.50 0.378 1 MAK: Methyl amyl ketone (solvent), each formulation had 0.1 wt% DBTDL as catalyst Coatings characterization
Slower drying solvents such as methyl amyl ketone
(MAK) can minimize solvent popping in high-build baked films, resulting in a uniform film free from surface defects.
In 1995, non-TRI solvents, including methyl amyl ketone
(MAK), n-butyl acetate and isobutyl acetate, were substituted in place of the solvents in use at that time.
We found that the modified shellac was soluble in MEK, methyl amyl ketone
(MAK), acetone, [CHCl.sub.3], dipropylene glycol monomethyl ether (DPM), THF, and DMAC.
(9) Methyl amyl ketone (MAK) was used as the diluent, and the reaction was catalyzed by dibutyltin dilaurate in the amount of 500 ppm.
This inverse concentration was substituted here by the ratio [c.sub.B]/[c.sub.s] where reference is made to the bulk state: [c.sub.s] is the weight concentration of functional groups in the presence of methyl amyl ketone (see equation 8).