	US 11,807,708 B2
	Flexibilizing capped prepolymers
Stephen D. Cummings, Pittsburgh, PA (US); Matthew Stewart, Pittsburgh, PA (US); Sharlene A. Lewis, Pittsburgh, PA (US); Rick L. Adkins, Canonsburg, PA (US); and Jack R. Reese, Coraopolis, PA (US)
Assigned to Covestro LLC, Pittsburgh, PA (US)
Filed by Covestro LLC, Pittsburgh, PA (US)
Filed on Feb. 18, 2021, as Appl. No. 17/178,793.
Claims priority of provisional application 62/978,346, filed on Feb. 19, 2020.
Claims priority of provisional application 62/978,348, filed on Feb. 19, 2020.
Claims priority of provisional application 62/978,354, filed on Feb. 19, 2020.
Prior Publication US 2021/0253778 A1, Aug. 19, 2021
Int. Cl. C08G 18/73 (2006.01); C08G 18/48 (2006.01); C08G 18/83 (2006.01); C09J 163/00 (2006.01); C08G 18/24 (2006.01); C08G 18/28 (2006.01); C08G 18/32 (2006.01); C08G 18/36 (2006.01)

CPC C08G 18/73 (2013.01) [C08G 18/4825 (2013.01); C08G 18/831 (2013.01); C08G 18/833 (2013.01); C09J 163/00 (2013.01); C08G 2170/00 (2013.01)]

20 Claims

1. A flexibilizing capped prepolymer, comprising:

a reaction product of a polyisocyanate and an isocyanate-reactive component,

wherein the polyisocyanate and the isocyanate-reactive components are combined at an equivalent NCO:OH or NCO:NH ratio of polyisocyanate equivalents to isocyanate-reactive component equivalents of from 1.4:1 to 2.1:1,

wherein the isocyanate-reactive component comprises a polyol component and a branching agent component,

wherein the branching agent component has a number average functionality of from 3 to 6 NCO-reactive functional groups,

wherein the branching agent component comprises a monoglyceride, a diglyceride, a triglyceride, or a combination thereof,

wherein the reaction product is terminated with a capping agent to form the flexibilizing capped prepolymer, and

wherein the capping agent comprises cashew nut shell liquid and one or more of p-cresol, m-cresol, or o-cresol.