Polyurethane resin, polyurethane resin composition, and method for manufacturing polyurethane resin
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United States of America Patent
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Feb 13, 2018
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Oct 16, 2014
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Oct 17, 2013
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Abstract
The present invention relates to a polyurethane resin including, as constituent units, a diol (a1) having a number average molecular weight of 500 to 10,000, an organic diisocyanate (b), and a chain extender (a2). The total concentration of urethane groups and urea groups in the polyurethane resin is 1.25 to 2.50 mmol/g based on the weight of the polyurethane resin. Hard segment domains of the polyurethane resin have an average domain size of 20 to 30 nm as measured with an atomic force microscope.
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