Method for strengthening wood products and modified unsaturated polyester resins therefor
AssigneeUniversity of Maine
InventorBen R. Bogner
Life of this patent
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Abstract
The strength of wood composites, including hybrid composites comprising wood members bonded to reinforced polyester members, is improved by modifying the polyester components with a polyisocyanate. Wood composites adhesively bonded with polyester resins modified according to this invention are particularly desirable for use in applications where exterior exposure is contemplated.
Claims25
A method for improving the adhesion of an unsaturated polyester resin to a lignocellulosic material comprising adding to said resin from 1 to about 20 wt. %, based on weight of polyester resin, of a polyisocyanate.
A composite comprising a wood member, a second member disposed at a predetermined location against a surface of said wood member, and a modified polyester resin disposed between the opposed surfaces thereof to bond them together, said resin comprising an unsaturated polyester, a copolymerizable unsaturated monomer, and from about 1 to about 20 wt. %, based on weight of polyester resin, of a polyisocyanate.
A composite comprising a plurality of wood members disposed in substantially parallel relation to one another, at least one FRP reinforcing panel disposed between two of said members, and a modified polyester resin disposed between the opposing surfaces of said members and said reinforcing panel bonding them together, said polyester resin comprising an unsaturated polyester, a copolymerizable unsaturated monomer, and from about 1 to about 20 wt. % of a polyisocyanate.
A method for forming a composite structure comprising a plurality of members including at least one wood member, said method comprising impregnating the bonding surfaces of at least one of the members to be bonded with a modified polyester resin comprising an unsaturated polyester, a copolymerizable unsaturated monomer, and from about 1 to about 20 wt. %, of a polyisocyanate;
- disposing a second member against the resin-impregnated bonding surface of said member;
- and bonding said members together.
A composition comprising an unsaturated polyester having an acid number in the range of from about 5 to about 70 mg KOH/g of resin, a copolymerizable liquid monomer, and from about 1 to about 20 wt. % of an aliphatic diisocyanate, based on the combined weight of polyester and said monomer.
In a polyester resin comprising an unsaturated polyester and a copolymerizable unsaturated monomer, the improvement wherein the composition further comprises from about 1 to about 20 wt. %, based on weight of polyester resin, of a polyisocyanate.
Dependencies are inferred from the claim text.