Method for improving adhesion of polyurethane adhesive to polyester based laminate without surface preparation
AssigneeHenkel lP & Holding GmbH
InventorsJayesh P. Shah, Sankar Govindarajan
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Abstract
Disclosed is a composite laminate made from unsaturated polyester resin that can be bonded using polyurethane adhesive without secondary treatment of the composite laminate and with improved bond strength and failure mode. Also disclosed are methods of making such composite laminates.
Claims14
An uncured resin composition comprising an unsaturated resin and an unsaturated monomer having a hydroxyl functional group.
Use of about 1% to about 30% by weight of resin composition of an unsaturated monomer having a hydroxyl functional group in an unsaturated resin composition to improve bond strength of a composite laminate made using the unsaturated resin composition.
A method of improving the bond strength of a composite article, comprising:
- adding about 1 wt % to about 30 wt % of an unsaturated monomer having a hydroxyl functional group to an unsaturated resin to form a resin composition;
- preparing a composite laminate from the resin composition;
- and
- bonding the composite laminate to a substrate with a structural adhesive;
- wherein an exterior layer of the composite laminate without secondary treatment has a higher bond strength to the substrate than an exterior layer of a composite laminate prepared from the resin composition without the unsaturated monomer having a hydroxyl functional group and bonded to the same substrate.
Dependencies are inferred from the claim text.