Aqueous compositions comprising phenolic resin and crosslinking agent
AssigneeLord Corporation
InventorsPeter J. Jazenski, John S. Sadowski
Life of this patent
Estimating the term…
Abstract
Storage-stable, heat-reactive aqueous compositions comprising at least one novolak phenolic resin, at least one formaldehyde polymer, and water, wherein said formaldehyde polymer is present in an amount sufficient to crosslink said novolak resin, are useful for direct bonding of natural and synthetic resins to rigid and non-rigid substrates and as primers for rubber-to-metal adhesives. The herein-described aqueous adhesive systems can have incorporated therein conventional additives such as fillers and the like.
Claims15
A heat-reactive water-based adhesive composition comprising:
- (a) at least one water-dispersible novolak phenolic resin;
- (b) an effective amount of at least one methylene donor selected from the group consisting of acetal homopolymers and acetal copolymers,
- said methylene donor having an average degree of polymerization greater than 200, a melting point of at least 75.degree. C. and being substantially insoluble in water at a temperature below the melting point;
- and
- (c) water;
- the amount of water being sufficient to afford an aqueous dispersion having a total solids content, based on novolak resin, in the range from about 5 to about 75 percent.
A heat-reactive water-based adhesive composition comprising
- (a) at least one at least water-dispersible novolak phenolic resin;
- (b) an effective amount of at least one methylene donor selected from the group consisting of gamma-polyoxymethylene ethers having the characteristic structure
- R.sup.1 --O--CH.sub.2 O).sub.n R.sup.2,
- wherein R.sup.1 and R.sup.2 can be the same or different and each is an alkyl radical having from 1 to 8 carbon atoms, and n is at least 100;
- and
- (c) water, the amount of water being sufficient to afford an aqueous dispersion having a total solids content, based on novolak resin, in the range from about 5 to about 75 percent.
Dependencies are inferred from the claim text.