Glutaraldehyde resin binding system for manufacture of wood products
AssigneeBorden, Inc.
InventorsWilliam D. Detlefsen, David Wen-I-Shiau, Nicholas K. Daisy
Life of this patent
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Abstract
This invention relates to ethyleneurea-glutaraldehyde resins, urea-ethyleneurea-glutaraldehyde resins, their synthesis, as well as their application as an adhesive for wood panel manufacture. Molar ratio of ethyleneurea to glutaraldehyde can range from 0.3 to 3.5. Urea incorporated into ethyleneurea-glutaraldehyde resin can be high as two times the moles of glutaraldehyde used in the formulation and can be introduced at any stage during the reaction course, simply post added, or any combination of the above.
Claims26
A resin adhesive system which comprises an ethyleneurea-glutaraldehyde resin having a molar ratio of ethyleneurea to glutaraldehyde of from about 0.3 to 3.5.
A urea-ethyleneurea-glutaraldehyde resin having from 0.1 to 2 moles of urea and 0.3 to 3.5 moles of ethyleneurea for each mole of glutaraldehyde.
An article comprising a body of wood products bonded together by the addition thereto, prior to curing, of an ethyleneurea-glutaraldehyde resin having a molar ratio of ethyleneurea to glutaraldehyde of from about 0.3 to 3.5.
An article comprising a body of wood products bonded together by the addition thereto, prior to curing, of a urea-ethyleneurea-glutaraldehyde resin having from about 0.1 to 2 moles of urea and 0.3 to 3.5 moles of ethyleneurea for each mole of glutaraldehyde.
A composite panel of wood particles bonded together by the addition thereto, prior to curing, of an ethyleneurea-glutaraldehyde resin having a molar ratio of ethyleneurea to glutaraldehyde of from about 0.3 to 3.5.
A method for the manufacture of an ethyleneurea-glutaraldehyde resin which comprises combining ethyleneurea with glutaraldehyde at a pH of about 6.5 to 10.5.
A method for the manufacture of a urea-ethyleneurea-glutaraldehyde terpolymer resin which comprises reacting a member selected from the group consisting of glutaraldehyde, ethyeneurea-glutaraldehyde resin, urea-glutaraldehyde condensate, and mixtures thereof with a member selected from the group consisting of urea, ethyleneurea, and mixtures thereof, to prepare a terpolymer resin having a molar ratio of from about 0.3 to 3.5 moles of ethyleneurea for each mole of glutaraldehyde and from about 0.1 to 2 moles of urea for each mole of glutaraldehyde and the reaction is conducted at a pH of from about 6.5 to 10.5.
A method for bonding lignocellulosic material under heat and pressure which comprises:
- a. applying an adhesive to said lignocellulosic material wherein the adhesive comprises an ethyleneurea-glutaraldehyde resin having a molar ratio of ethyleneurea to glutaraldehyde of from about 0.3 to 3.5 and up to 2 moles of urea per mole of glutaraldehyde;
- and
- b. consolidating said lignocellulosic material and curing the resin.
A method for making particleboard which comprises the steps of:
- a. applying to a furnish a curable ethyleneurea-glutaraldehyde resin binder formulation having a pH of about 7.5 to 12.5, a resin solids content of from about 45% to 75% by weight of said resin;
- and
- b. then bonding said furnish and applied binder formulation under heat and pressure and curing said resin binder.
Dependencies are inferred from the claim text.