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Novel castor oil-based polyol emulsionsNovel castor oil-based polyol emulsions description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070149721, Novel castor oil-based polyol emulsions. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001]The present invention relates to polyol emulsions of castor oil and monoepoxides and to polymer cements prepared therefrom together with methylenediphenyl diisocyanate (MDI) and cement. [0002]The preparation of polymer cements from castor oil emulsions, MDI and cement is known and is described in GB 2353993. The castor oil emulsions used there are, however, relatively highly viscous and therefore not optimally processable. [0003]JP 2001-302304 and JP 2004067463 describe polyol emulsions of castor oil and the reaction products of castor oil with monoepoxides. The viscosity of these emulsions is lower than that of pure castor oil emulsions, but the preparation of the ricinoleic acid/monoepoxide adducts requires an additional reaction step. [0004]Furthermore, the ricinoleic acid/monoepoxide adducts still contain OH groups, which are capable of forming hydrogen bridge bonds and thus increase the viscosity. [0005]Emulsions of castor oil and a reactive diluent which contains no OH groups, but, under the basic reaction conditions of the polymer cement formation, forms free OH groups which then react with the MDI with crosslinking are therefore desirable. SUMMARY OF THE INVENTION [0006]Surprisingly, it has been found that low-viscosity emulsions having the desired properties, which can be reacted with MDI and cement to give polymer cements, can be prepared from castor oil and monoepoxides. Under the reaction conditions of the polymer cement formation, the monoepoxide reacts with ring opening to give the corresponding glycol and thus provide the required OH groups. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION [0007]The present invention therefore relates to emulsions which include: [0008]25 to 45 parts by weight, preferably 25 to 35 parts by weight, of water, [0009]45 to 69.5 parts by weight, preferably 55 to 63 parts by weight, of castor oil, [0010]5 to 30 parts by weight, preferably 7 to 15 parts by weight, of one or more monoepoxides and [0011]0.5 to 5 parts by weight of auxiliaries and additives. [0012]In the context of the invention, "castor oil" includes esters of glycerol with ricinoleic acid, on average at least two of the OH groups of the glycerol being esterified with ricinoleic acid. Both industrial and pharmaceutical qualities may be used. [0013]In the context of the invention, "monoepoxides" are all compounds having one epoxy group per molecule. Preferred monoepoxides correspond to the general formulae (I) to (IV) [0014]in which [0015]R represents a C.sub.4- to C.sub.18-alkyl radical or a tri(m)ethoxysilylpropyl radical and [0016]R' represents a hydrogen atom, a C.sub.1- to C.sub.4-alkyl radical or a vinyl group. [0017]Monoepoxides represented by the formula I or II are preferably used and those represented by the formula I, particularly those in which R represents a C.sub.8- to C.sub.16-alkyl radical, are most preferably used. [0018]Auxiliaries and additives useful in the practice of the present invention include, for example, nonionic emulsifiers, antifoaming agents and thickeners which, in a preferred embodiment, are present as auxiliaries and additives in the emulsions according to the invention. [0019]Nonionic emulsifiers which may be used include ethoxylated fatty alcohols, alkyl phenols, fatty acid esters of polyethylene oxides, fatty acid esters of sorbitan, ethoxylated sorbitan, block copolyethers of polyethylene oxide with other polyepoxides, preferably polypropylene oxide, ethoxylated fatty amines, fatty amides or glycosides or esters of sugars. It is also possible to use mixtures of nonionic emulsifiers, the HLB (Hydrophile-Lipophile Balance) value of the total mixture being 8 to 19, preferably 10 to 14. [0020]The HLB value is 20 for pure polyethylene oxide and 0 for pure polyolefin, the HLB value being proportional to the polyethylene oxide content. This can be expressed by the formula HLB=20(M/M), where M.sub.h is the molecular weight of the hydrophilic part of the molecule and M is the molecular weight (Method of Griffin). [0021]Antifoaming agents which may be used in the practice of the present invention include, for example, silicones, silicones containing ether groups, hydrophobic silicas, nonionic emulsifiers having an HLB value of 3 to 10 and mineral oils. Continue reading about Novel castor oil-based polyol emulsions... Full patent description for Novel castor oil-based polyol emulsions Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Novel castor oil-based polyol emulsions patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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