253678-59-0Relevant articles and documents
ADDITIVES FOR PRODUCING POLYURETHANES
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Paragraph 0093-0094, (2021/11/20)
A foam forming composition is provided. The foam forming composition comprises, as an additive, a bis-carbamate compound, a bis-functional amide compound, or combination of two or more thereof. The compositions are suitable for producing flexible foams. Foams formed from compositions comprising these additives exhibit improved properties including improvement in one or more of tensile strength, tear strength, and/or elongation at break.
Diisocyanate free and melt polycondensation preparation of bio-based unsaturated poly(ester-urethane)s and their properties as UV curable coating materials
Han, Lijing,Dai, Jinyue,Zhang, Lisheng,Ma, Songqi,Deng, Jun,Zhang, Ruoyu,Zhu, Jin
, p. 49471 - 49477 (2014/12/11)
This paper reported the synthesis of bio-based unsaturated poly(ester-urethane)s via a nonisocyanate route, by metal-catalyzed melt polycondensation of itaconic acid with urethanediols. Three novel types of bio-based unsaturated poly(ester-urethane)s, namely, poly(urethanediol 2-itaconic acid), poly(urethanediol 4-itaconic acid) and poly(urethanediol 6-itaconic acid) (poly(U2-IA), poly(U4-IA) and poly (U6-IA) for short code, respectively), were prepared by a green synthetic route. The urethane linkage was formed by the reaction of two equivalent of ethylene carbonate with 1,6-hexanediamine, 1,4-butanediamine and 1,2-ethanediamine to form urethanediols. The urethanediols underwent polymerization with itaconic acid (IA) in the presence of metal catalyst dibutyltin dilaurate (DBTL) to produce low-molecular-weight bio-based unsaturated polyurethanes. Then, these bio-based unsaturated poly(ester-urethane)s were formulated with free radical photoinitiator and curing promoter to prepare UV curable polyurethane systems. After UV curing, the tensile properties, thermal properties and general coating properties of the three UV-cured polyurethane films were similar to that of UV cured polyurethane films prepared by polyurethane-acrylate (PUA). The results suggested that the obtained bio-based unsaturated polyurethanes could serve as coating materials.
Synthesis of oligourethanes with terminal hydroxy groups
Mikheev,Zainullina
, p. 1454 - 1457 (2007/10/03)
A method was developed for preparing urethane oligomers with terminal hydroxy groups by polycondensation of urethane glycols. The reaction kinetics was studied, and the optimal reaction conditions were found. Some properties of oligourcthanes were determined.