Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1994-05-25
1996-10-22
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
428413, 523404, 525526, 528111, 564505, C08K 320, C08L 6302
Patent
active
055677487
DESCRIPTION:
BRIEF SUMMARY
The invention relates to water-soluble or miscible resin compositions having terminal amine moieties which are capable of reacting with glycidyl ether moieties preferred embodiments of which are particularly useful in pigmented coating compositions. In another aspect, the invention relates to a process for preparing such resins. In yet another aspect, the invention relates to water-based coating compositions based on amine terminated resin compositions of the invention and further containing curable epoxy resins.
EP 0 070 550 discloses aqueous dispersions of resinous coating compositions which contain 0.5 to 40 percent by weight of an ungelled resin formed by reacting a polyepoxide with a polyoxyalkylene polyamine, which reaction product is partially neutralized with acid to provide cationic groups; and 60 to 99 percent by weight of an additional cationic resin which is electrodepositable on the cathode. The use of polyglycidyl ethers of polyhydric alcohols as the polyepoxide is disclosed but discouraged. The reference does not disclose a composition which is water soluble or dispersible in the absence of converting some of the terminal groups to cationic moieties. Nor does it disclose a composition which can be used as a curing agent for other epoxy resins in two part coating compositions.
Two part epoxy resin based coating systems generally comprise a curable epoxy resin and a curing agent for the epoxy resin, and are commonly dispersed or dissolved in a solvent, primarily an organic solvent to prepare coating compositions, for example paints and floor sealants. Significant environmental concerns are created due to the use of such organic solvent based coating compositions as the evaporation of the organic solvents create the potential for environmental pollution and for creating health hazard. On the other hand, cured epoxy resin based coatings provide hard and abrasion resistant coatings which are resistant to hydrocarbons and aqueous media.
Water-based resins systems consisting of an epoxy resin and a curing agent dissolved or emulsified in water have been developed, and create less environmental and health concerns. The advantages of water dispersible epoxy resin systems include reduced environmental pollution, less obtrusive solvent odor during application, reduced health and safety risks, reduced flammability, water clean-up of application equipment, excellent wettability to moist concrete and good adhesion and mechanical strength. Known two part water-based epoxy resin emulsion coating compositions have significant disadvantages. It is difficult to develop stable emulsions, which have high solids content and low viscosity and therefore good flowability. Further, many of the known systems display poor coatings properties, as they do not readily coalesce when coated on a substrate resulting in coatings with poor flexibility and adhesion. Such systems have a very limited balance between hydrophilic and hydrophobic properties resulting in little flexibility in the formulation of coatings. Such systems suffer from the inability to effectively incorporate pigments into the coating composition. Pigments are often blended with the curing agent with grinding or agitation, and when some curing agents are blended with pigments the mixture undergoes exothermic heating and the curing agent can begin to react thus increasing the viscosity. This causes the flow properties of the system to deteriorate, making application of the system difficult or impossible. Other known curing agents do not form-stable dispersions containing the pigments.
What is needed is a curing agent for epoxy resins which forms a stable water-emulsion or is water soluble. Such a curing agent which cures aqueous epoxy resin compositions to give good coatings with good drying speeds is needed. Further, what is needed is two part coating corn positions of epoxy resins and curing agents therefor which are stable and give good coating properties; i.e. low color formation, low viscosity, adhesion, toughness, resiliency and flexibility. Such formu
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Klein Dieter H.
Wessely Hans J.
Aylward D.
Marquis Melvyn I.
The Dow Chemical Company
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