Claims
- 1. A two-part adhesive suitable for bonding wood and which is both heat curable and radio frequency (RF) curable, which comprises(a) an isocyanate-terminated prepolymer; and (b) aqueous hydrolyzed soy protein having a pH of at least about 9, wherein the weight ratio of (a) to (b) ranges from between about 70:30 to 90:10.
- 2. The adhesive of claim 1, wherein said soy protein is hydrolyzed with one or more of an oxide or hydroxide of an alkali metal or an alkaline earth metal; a caustic alcohol; NH4OH, or an amine base.
- 3. The adhesive of claim 1, wherein said isocyanate-terminated prepolymer is made from an isocyanate component selected from hexamethylene diisocyanate, toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), m- and p-phenylene diisocyanates, bitolylene diisocyanate, cyclohexane diisocyanate (CHDI), bis-(isocyanatomethyl) cyclohexane (H6XDI), dicyclohexylmethane diisocyanate (H12MDI), dimer acid diisocyanate (DDI), trimethyl hexamethylene diisocyanate, lysine diisocyanate and its methyl ester, isophorone diisocyanate, methyl cyclohexane diisocyanate, 1,5-napthalene diisocyanate, xylylene and xylene diisocyanate and methyl derivatives thereof, polymethylene polyphenyl isocyanates, chlorophenylene-2,4-diisocyanate, polyphenylene diisocyanates, isophorone diisocyanate (IPDI), hydrogenated methylene diphenyl isocyanate (HMDI), tetramethyl xylene diisocyanate (TMXDI), hexamethylene diisocyanate (HDI), or oligomers thereof, and mixtures thereof.
- 4. The adhesive of claim 1, wherein said isocyanate-terminated prepolymer is made from a component containing an active hydrogen group.
- 5. The adhesive of claim 4, wherein said active hydrogen group component is selected from acrylates, esters, vinyls, castor oils, polymers and mixtures thereof, containing active hydrogen groups.
- 6. The adhesive of claim 5, wherein said active hydrogen group component is selected from aliphatic and aromatic polyether polyols optionally alkylated, and caprolactone-based polyols.
- 7. The adhesive of claim 6, wherein said active hydrogen group component is a block polyethylene or polypropylene oxide homo- or co-polymer ranging in molecular weight from about 300 to about 3,000.
- 8. The adhesive of claim 1, wherein said isocyanate prepolymer contains a defoamer and an inhibitor.
- 9. The adhesive of claim 8, which has a pot-life between about 8-20 minutes.
- 10. The adhesive of claim 1, wherein said isocyanate pre-polymer has an NCO content of between about 17 and 22.
- 11. The adhesive of claim 1, wherein said aqueous hydrolyzed soy protein has a pH ranging from between about 9 and 11.5.
- 12. The adhesive of claim 1, wherein said aqueous hydrolyzed soy protein contains a surfactant.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a divisional application of U.S. Ser. No. 09/314,420, filed May 18, 1999, now U.S. Pat. No. 6,231,985, the disclosure of which is expressly incorporated herein by reference.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3873478 |
Comte et al. |
Mar 1975 |
A |
6197863 |
Eck et al. |
Mar 2001 |
B1 |