Disclosed is a process for the preparation of emulsifiers E1 which are obtained by (a) reacting a polyol with propylene oxide or a mixture of ethylene oxide and propylene oxide, to give an intermediate Z1, (b) reacting the intermediate Z1 with epichlorohydrin, forming an intermediate Z2, (c) reactin
Disclosed is a process for the preparation of emulsifiers E1 which are obtained by (a) reacting a polyol with propylene oxide or a mixture of ethylene oxide and propylene oxide, to give an intermediate Z1, (b) reacting the intermediate Z1 with epichlorohydrin, forming an intermediate Z2, (c) reacting the intermediate Z2 with an adduct of ethylene oxide or a mixture of ethylene oxide and propylene oxide, with a C1-C22 monoalcohol, provided that on average at least one epoxide function of the intermediate Z2 is reacted and on average at least one epoxide function originating from the intermediate Z2 is retained. Compounds E1 are suitable as emulsifiers for preparing aqueous emulsions or dispersions of epoxy resins.
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What is claimed is: 1. A process for the preparation of emulsifiers E1, comprising: (a) reacting a polyol having at least three OH groups, with an alkylene oxide selected from the group consisting of propylene oxide and a mixture of ethylene oxide and propylene oxide containing at least 65 mole % p
What is claimed is: 1. A process for the preparation of emulsifiers E1, comprising: (a) reacting a polyol having at least three OH groups, with an alkylene oxide selected from the group consisting of propylene oxide and a mixture of ethylene oxide and propylene oxide containing at least 65 mole % propylene oxide, based on the sum of ethylene oxide and propylene oxide, to give an intermediate Z1 having at least two OH groups, (b) reacting said intermediate Z1 with epichlorohydrin, provided that on average at least two of the OH groups present in Z1 are reacted, thereby forming an intermediate Z2 having at least two epoxide groups, and (c) reacting said intermediate Z2 with an adduct of an alkylene oxide selected from the group consisting of ethylene oxide and a mixture of ethylene oxide and propylene oxide containing at least 65 mole % ethylene oxide, based on the sum of ethylene oxide and propylene oxide, with at least one C1-C22 monoalcohol, provided that on average at least one epoxide group of said intermediate Z2 is reacted and on average at least one epoxide group originating from said intermediate Z2 is retained, thereby providing compounds E1. 2. The process of claim 1, wherein said polyol of step (a) is selected from the group consisting of pentaerythritol and trimethylolpropane. 3. The process of claim 1, wherein the ratio of said polyol to said alkylene oxide of step (a) is about 1:1 to about 1:100. 4. The process of claim 1, wherein the ratio of said alkylene oxide to said monoalcohol of step (c) is about 10:1 to about 100:1. 5. A method of preparing aqueous emulsions or dispersions of epoxy resins comprising: (a) providing at least one emulsifier E1, obtained by the process of claim 1; (b) adding at least one epoxy resin, and (c) emulsifying with water. 6. The process of claim 1, wherein said alkylene oxide of reaction step (a) is exclusively propylene oxide. 7. The process of claim 6, wherein reaction step (a) uses about 3 to about 20 moles of propylene oxide per mole of polyol. 8. The process of claim 1, wherein step (c) consists of reacting said intermediate Z2 with an adduct of about 10 to about 50 moles of ethylene oxide per mole of a C1-C4 monoalcohol. 9. An emulsifier mixture comprising 1-99% by weight of the epoxy resin emulsifier E1 prepared by the process of claim 1, and 1-99% by weight of an epoxy resin emulsifier E2 which is different from E1. 10. The emulsifier mixture of claim 9, wherein said epoxy resin emulsifier E2 comprises the reaction product of a diol having an average molecular weight in the range from about 200 to about 20 000 which is selected from the group consisting of polyethylene glycols, polypropylene glycols, and ethylene oxide/propylene oxide block polymers, reacted with bisphenol A diglycidyl ether. 11. An aqueous epoxy resin preparation in the form of an emulsion or dispersion of one or more epoxy resins in water, comprising about 1% to about 70% by weight, based on the preparation, of an epoxy resin and about 0.1% to about 50% by weight, based on the preparation, of the epoxy resin emulsifier E1 of claim 1. 12. The aqueous epoxy resin preparation of claim 11, further comprising about 0.1 to about 50% by weight, based on the preparation, of an additional epoxy resin emulsifier E2 which is different from E1. 13. The aqueous epoxy resin preparation of claim 9, wherein said epoxy resin emulsifier E2 comprises a reaction product of a diol having an average molecular weight in the range from about 200 to about 20 000 which is selected from the group consisting of polyethylene glycols, polypropylene glycols, and ethylene oxide/propylene oxide block polymers, reacted with bisphenol A diglycidyl ether. 14. The compounds of the process of claim 1.
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