Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1991-04-19
1992-12-08
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524321, 524322, 524398, 524487, 524563, C08K 509
Patent
active
051698919
DESCRIPTION:
BRIEF SUMMARY
This invention is concerned with coating compositions for waterproofing, glues, paints, and anti corrosion treatments for metals, and in particular with such compositions containing polyethylene vinyl acetate (EVA) and metal complexes or nitrogen based cations (ammonia, amines and quaternary salts).
WATERPROOFING FORMULATIONS
Cationic oil-in-water and water-in-oil emulsions employing a polyvalent metal (e.g. Cr, Ti, Al, Zr, Sn) with a fatty acid and a paraffinic wax component, are commonly used as waterproofing preparations. (For these purposes oxidised waxes can be considered to be fatty acids with very long hydrocarbon chains, blended with paraffinic wax.)
Also wax based anionic preparations can be prepared which are subsequently deposited on substrates by ion exchange with soluble salts of dibasic or polybasic metals. The anionic component may be applied before or after the polybasic metal salt component.
Additionally solutions of waxes containing reactive metal complexes are used in order to impart water-repellency, especially in the dry-cleaning trade. The metals employed belong to the group listed above for use in water-based formulations.
Polybasic metals are generally used in the application of water-repellency because of their ability to attach themselves to sites on the textile or leather to which they are applied. Thus the metal forms a bridge between the substrate and the hydrophobic component, commonly a negative organic ion, of the water-repellent preparation.
Initial water-repellency achieved using systems of the type described can be very good. Unfortunately durability is in general poor, because the adhesion of the hydrophobic component to the substrate is not maintained in conditions of flex and abrasion.
Another route to the breakdown of these water-repellent systems is wetting itself. Wetting leads to the swelling of most fibres, and in that case the fibre stretches away from the hydrophobic coating. Therefore water-resistance and water-repellency are reduced every time the fabric is wetted, leading to rapid breakdown in practical field conditions.
Metal soap or wax plus metal soap formulations have traditionally found their applications on natural fibres and natural fibre mixes in the textile industry. Applications to coarser synthetic fibres like polyamides have not been found to be very successful for reasons of appearance and poor adhesion. Applications above a very low level indeed lead to crazing and chalking on these fabrics.
The durability of these waterproofing preparations in conditions of flex and abrasion would be greatly enhanced if a level of elasticity could be incorporated into the final coating. Elasticity would allow the coating to be resilient to flex and abrasion, and to the stretch which occurs during wetting.
This invention described a means to incorporate elasticity into water-repellent preparations based on metal complexes by incorporating EVA into the system.
ADHESIVE FORMULATIONS
Common solvent based adhesives incorporate a blend of EVA, a tackifier resin, and high solvency solvents such as aromatic hydrocarbons, chlorinated hydrocarbons, alcohols or glycols or cellosolve variants. All of these solvents are both expensive and pose significant health hazards.
This invention describes a means by which an effective glue can be formulated using EVA, innocuous low aromatic mineral spirits, tackifier resin, and a metal complex. The formulation can be prepared as an oil-in-water emulsion, water-in-oil emulsion, or as a purely solvent based formulation.
ANTI-CORROSION PREPARATIONS FOR METALS
Oxidation of metals is an ubiquitous problem.
This invention describes a means to bond a continuous film of a compounds of EVA to a metal surface, thus providing an elastic, waterproof and resilient protection onto which subsequent paint coatings can be applied. The metal incorporated in the formulation will be either the metal itself or a combination of another metal and the metal itself.
PAINTS
This invention describes a means to provide a binder for water-resistant a
REFERENCES:
patent: 3493537 (1970-02-01), Salyer et al.
patent: 4681910 (1987-07-01), Crockatt et al.
patent: 4975481 (1990-12-01), Tamm et al.
Chemical Abstract 92586u, vol. 81, No. 16, Oct. 1974.
Dodd Thomas J.
Michl Paul R.
Yoon Tae H.
LandOfFree
Coating compositions comprising a blend of an ethylene vinyl ace does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Coating compositions comprising a blend of an ethylene vinyl ace, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coating compositions comprising a blend of an ethylene vinyl ace will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-961442