US 11,732,083 B2
Polyisocyanate resins
Kurt E. Best, Wexford, PA (US); Daniel P. Wang, Pittsburgh, PA (US); and Joseph Kleer, Crescent, PA (US)
Assigned to Covestro LLC, Pittsburgh, PA (US)
Filed by Covestro LLC, Pittsburgh, PA (US)
Filed on Nov. 19, 2020, as Appl. No. 16/952,511.
Prior Publication US 2022/0153916 A1, May 19, 2022
Int. Cl. C08G 18/72 (2006.01); C08G 18/28 (2006.01); C09D 175/02 (2006.01); C08L 75/02 (2006.01); B32B 27/28 (2006.01); C08G 18/75 (2006.01); C08G 18/12 (2006.01); C08G 18/50 (2006.01); C08G 18/73 (2006.01); C08G 18/78 (2006.01); C08G 18/34 (2006.01); C08G 18/42 (2006.01)
CPC C08G 18/755 (2013.01) [C08G 18/12 (2013.01); C08G 18/5042 (2013.01); C08G 18/73 (2013.01); C08G 18/7825 (2013.01); C09D 175/02 (2013.01)] 20 Claims
 
1. A polyisocyanate resin, comprising:
from 25 wt % to 50 wt %, based on a total weight of the polyisocyanate resin, of a first cycloaliphatic polyisocyanate having an NCO % of from 12 wt % to 20 wt % based on ISO 11909:2007; and
from 50 wt % to 75 wt %, based on a total weight of the polyisocyanate resin, of a flexibilizing component, comprising
an isocyanate-terminated reaction product of a second cycloaliphatic polyisocyanate and an isocyanate-reactive material, the isocyanate-terminated reaction product having a Tg of less than −30° C. based on a Differential Scanning Calorimetry (2nd Heating) temperature scan from −100° C. to 150° C. using 20° C./min heating and cooling ramps, and
a linear aliphatic polyisocyanate having a number average isocyanate functionality of from 2 to 3 based on gel permeation chromatography,
wherein the isocyanate-terminated reaction product and the linear aliphatic polyisocyanate are present at a weight ratio of from 0.5 to 3.