摘要:
Provided herein are polyurea polymers made from an organic isocyanate and a polyamine component, wherein the polyamine component comprises a polyether polyamine in which the nitrogen atoms are secondary. The polyurea polymers of the invention are useful in a wide range of end-use applications and possess superior physical properties over polyurea polymers of the prior art. Methods for producing the polyurea polymers are also disclosed.
摘要:
Provided herein are polymers, including polyureas, polyurethanes, and polyurea-polyurethane hybrids, made from an isocyanate, a secondary polyetheramine, an aspartic ester amine, and optionally a polyol. The secondary polyetheramine may be used in combination with the aspartic ester amine to increase flexibility or modify other properties and lower cost of the final polymer product while maintaining a desirable cure time.
摘要:
Provided herein are polymers, including polyureas, polyurethanes, and polyurea-polyurethane hybrids, made from an isocyanate, a secondary polyetheramine, a second amine, and optionally a polyol. The secondary polyetheramine may be used in combination with the second amine to modify other properties of the polymer, including its cure time and cost.
摘要:
Disclosed are derivatives of isophorone diamine exhibiting a synergistic relationship with other commonly employed chain extenders offerings enhanced efficacy with regard to slowing of the polyurea elastomer cure profile, and processes employing their use. According to the invention, extensions of the gel-free and tack-free times are more readily achieved at lower loading levels for these chain extender blends than are afforded through the sole use of the individual molecules.
摘要:
A method of producing a carbonate product including mixing a DMC and methanol mixture with an alcohol, reacting the DMC with the alcohol to form carbonate product, and removing a substantial portion of unreacted DMC and methanol. In one embodiment, the method may be repeated to reach a desired alcohol conversion by adding more DMC and methanol mixture.
摘要:
A method of producing a carbonate product including mixing a DMC and methanol mixture with an alcohol, reacting the DMC with the alcohol to form carbonate product, and removing a substantial portion of unreacted DMC and methanol. In one embodiment, the method may be repeated to reach a desired alcohol conversion by adding more DMC and methanol mixture.