	US 11,745,444 B2
	Simultaneous optimization of fiber sizing in-line with the pultrusion process
Elias Ruda Shakour, Wyandotte, MI (US); Syed Ashraf, Wyandotte, MI (US); Matthew Gerard Lyon, Wyandotte, MI (US); Joseph P. Borst, Wyandotte, MI (US); and Robert Lyons, Wyandotte, MI (US)
Assigned to BASF SE, Ludwigshafen am Rhein (DE)
Appl. No. 16/964,895
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Jan. 29, 2019, PCT No. PCT/EP2019/052051 § 371(c)(1), (2) Date Jul. 24, 2020, PCT Pub. No. WO2019/149672, PCT Pub. Date Aug. 8, 2019.
Claims priority of provisional application 62/625,441, filed on Feb. 2, 2018.
Claims priority of application No. 18168143 (EP), filed on Apr. 19, 2018.
Prior Publication US 2021/0031468 A1, Feb. 4, 2021
Int. Cl. C08K 7/14 (2006.01); B29C 70/52 (2006.01); C08J 5/06 (2006.01); C08K 9/04 (2006.01); B29K 75/00 (2006.01)

CPC B29C 70/521 (2013.01) [C08J 5/06 (2013.01); C08K 7/14 (2013.01); C08K 9/04 (2013.01); B29K 2075/00 (2013.01); C08J 2375/08 (2013.01)]

28 Claims

1. A pultrusion process for preparing a reinforced thermoset polyurethane composite, the process comprising the steps of:

a) contacting a plurality of reinforcing fibers with a sizing composition comprising at least one sizing agent selected from at least one polyimine having a weight average molecular weight in a range of ≥800 g/mol to ≤1,000,000 g/mol determined according to gel permeation chromatography, to obtain a plurality of sized reinforcing fibers;

b) coating the plurality of sized reinforcing fibers obtained in step a) with a precursor mixture comprising (i) at least one di- or polyisocyanate and (ii) at least one polyol to obtain a plurality of coated sized reinforcing fibers; and

c) passing the plurality of coated sized reinforcing fibers obtained in step b) through at least one die and at least one heating zone to obtain the reinforced thermoset polyurethane composite.