The "urethane" in the name "polyurethane" refers to these carbamate groups; ethyl carbamate (common name "urethane") is neither a component of polyurethanes, nor is used in their manufacture.
The "urethane" in the name "polyurethane" refers to these carbamate groups. Ethyl carbamate (common name "urethane") is neither a component of polyurethanes. Ethyl carbamate (common name "urethane") is used in their manufacture.