Polyurethane adhesive for a surface treatment-free fiber reinfor

Details Polyurethane adhesive for a surface treatment-free fiber reinfor Polyurethane adhesive for a surface treatment-free fiber reinfor

1988-02-18

1989-10-24

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524781, 524783, 524786, 524789, 1563314, 4284321, 4284258, 528 65, 528 66, C08L 7504

Patent

active

048763080

ABSTRACT:
A two component type polyurethane adhesive is provided for fiberglass reinforced plastics which requires no cleaning, preparation or treatment of the surface, and the like. The curative component is a nitrogen-free liquid polyether or polyester in an amount such that in association with a urethane prepolymer component containing free NCO groups, the ratio of the free NCO groups in the prepolymer component to the OH groups in said curative component is at least 1.2 and desirably at least 1.35. Such high NCO/OH ratios have unexpectedly been found to provide good adhesion and especially good humidity adhesion and peel strength adhesion to fiberglass reinforced plastics or metal surfaces which are free from any surface treatment.

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Article "New Urethane Adhesive and Adhesive Sealants for Bonding SMC" by Foreman et al., 35th Annual Technical Conference, 1980, Reinforced Plastics/Composites Institute, The Society of the Plastics Industries, Inc.

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