Patent ID: 9441067
Filing Date: 2016-09-13
CPC Classification: C08G

Claim Text:
1. A process for making a fiber-reinforced polyurethane or polyurethane-urea composite, comprising wetting fibers 2.54 to 10.2 cm in length with a curable polyurethane and/or polyurea-forming formulation and dispensing the wetted fibers onto a form or mold and then curing the curable formulation on the form or in the mold to form a cured polyurethane or polyurethane-urea polymer reinforced with the fibers, wherein the curable formulation is formed by mixing a polyol component that includes at least one polyol and at least one particulate filler having an aspect ratio of less than 2.0 and longest dimension of 50 nm to 1 mm and a polyisocyanate component that includes a urethane group-containing MDI or polymeric MDI that contains MDI and polymethylene polyphenylisocyanates that contain at least three phenylisocyanate groups, and further wherein (1) the particulate filler constitutes from about 10 to 60% by weight of the curable formulation and (2) the calculated molecular weight between crosslinks of the cured polyurethane or polyurethane-urea is from about 350 to 400, wherein the calculated molecular weight between crosslinks is determined according to the formula where: M W W F E W E F W