	US 11,807,707 B2
	Polyurethane prepolymers incorporating nonlinear short chain diols and/or soft diisocyanates compositions, and uses thereof
Razmik Boghossian, Sylmar, CA (US); and James Smith, Glendale, CA (US)
Assigned to PRC-DESOTO INTERNATIONAL, INC., Slymar, CA (US)
Filed by PRC-DeSoto International, Inc., Sylmar, CA (US)
Filed on Oct. 12, 2021, as Appl. No. 17/499,042.
Application 17/499,042 is a continuation of application No. 15/384,346, filed on Dec. 20, 2016, granted, now 11,180,604.
Prior Publication US 2022/0025098 A1, Jan. 27, 2022
Int. Cl. C08G 18/10 (2006.01); C08G 18/48 (2006.01); C08G 18/44 (2006.01); C08G 18/32 (2006.01); C08G 18/42 (2006.01); C08G 18/76 (2006.01); C09D 175/02 (2006.01); C08G 18/66 (2006.01); C08G 18/75 (2006.01); C08G 18/12 (2006.01)

CPC C08G 18/3206 (2013.01) [C08G 18/10 (2013.01); C08G 18/12 (2013.01); C08G 18/3212 (2013.01); C08G 18/42 (2013.01); C08G 18/44 (2013.01); C08G 18/4825 (2013.01); C08G 18/4854 (2013.01); C08G 18/664 (2013.01); C08G 18/6674 (2013.01); C08G 18/758 (2013.01); C08G 18/7671 (2013.01); C09D 175/02 (2013.01)]

27 Claims

1. An isocyanate-terminated polyurethane prepolymer comprising a one-step reaction product of reactants comprising:

(a) a polymeric diol, wherein the polymeric diol comprises a polyether diol, a polycarbonate diol, or a combination thereof;

(b) a diisocyanate comprising a rigid diisocyanate and a soft diisocyanate, wherein the diisocyanate comprises a wt % ratio of the rigid diisocyanate to the soft diisocyanate from 1:1 to 4:1; and

(d) a branched non-linear short chain diol, a cyclic diol, or a combination thereof;

wherein the isocyanate-terminated polyurethane prepolymer is liquid at 25° C. and 100 kPa;

wherein the isocyanate-terminated polyurethane prepolymer has a hard segment content from 50 wt % to 60 wt %;

wherein the hard segment content comprises moieties derived from the rigid diisocyanate; and

wherein wt % is based on the total weight of the reactants.