Process for the preparation of urethane resins and urethane resin compositions
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United States of America Patent
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Apr 24, 2007
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N/A
app pub date -
Jun 17, 1998
filing date -
Jun 17, 1997
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Abstract
A process for the preparation of urethane resins, which comprises the steps of: preparing a product (A) having a hydrolysable group directly bonded to 1 10 silicon atoms and having less than two secondary amino groups in one molecule; preparing a product (B) having a terminal isocyanate group in an amount 4% or less by weight of the product (B); and reacting the product (A) with the product (B) in proportions of at least 0.5 equivalent of the product (A) per free NCO group of the product (B). The process readily gives urethane resins, which exhibit excellent storage stability and are enhanced in the degrees of freedom of the physical properties of the products of curing.
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