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United States Patent Office 3,586,653 United States Patent Office Patented June 22, 1971 2 classical reagents, the operative conditions of which are 3,586,653 PROCESS OF MANUFACTURING ALKYO RESENS glycerol.not the ones conventionally recommended when using FROM UNSATURATED FATTY ACIDS, PHTHAL CANHYDRDES AND GLYCDOL Another object of the present invention is the manu Jacques Fritz, Champagne-au-Mont-d'Or, France, assignor facture of mass-resins which are usable as the major con to Progil, Paris, France stituent of paints and coatings, the properties of which No Drawing. Fied Jan. 7, 1969, Ser. No. 789,598 are more advantageous than the ones of known composi Clains priority, applicifrance, Jan. 12, 1968, tions based on glycerol and the cost of which is lower. 9 It is apparent that glycidol is becoming a more and more Ent. C. C08g 17/007, 17/16; CO9d 3/64 O O available raw material due to allyl alcohol epoxidation U.S. C. 260-22EP 7 Claims techniques and now constitutes an economical means for obtaining glycerol itself. According to the process of the present invention, un ABSTRACT OF THE DISCLOSURE Saturated fatty acids, phthalic anhydride and glycidol are Modified alkyd resins are made by contacting a mix 5 simultaneously brought into contact at room temperature, ture of unsaturated fatty acids, phthalic anhydride and then, with continuous stirring, the reaction mixture is glycidol, heating progressively to a temperature of 200 progressively heated up to a temperature reaching 200 to 250 C. until the theoretical quantity of water is formed 250 C. until all of the formed water is recovered, after and then removing the unreacted raw materials by dis which the possible traces of unreacted raw materials are tillation. The reaction can be conducted in the presence 20 removed by distillation. of an organic solvent. The alkyd resin obtained in this Way may be recovered mem and stored as a mass-resin. It is also possible to dissolve it in a convenient solvent to obtain, after addition of a The present invention relates to a novel process of convenient catalytic system, and possibly of anti-skinning manufacturing alkyd resins. It relates more especially to agents, pigments and thixotropic agents, coatings and the manufacture of modified and improved alkyd resins, paints of glycerophthalic type capable of forming films from an epoxy-alcohol, fatty acids and phthalic anhy having an excellent hardness and a great abrasion and dride, and to the novel resulting products. shock resistance. Numerous processes of alkyd resin modification have By use of the Words "unsaturated fatty acids" are meant already been described. Indeed, it is known that glyptal 30 compositions containing more than 30% by weight of resins obtained by glycerol and phthalic anhydride con fatty acids which contain at least two ethylenic double densation are brittle and have little flexibility. A greater bonds in their molecule, such as for example linoleic flexibility is imparted to them by replacing a part of the and/or linolenic acid. Such acids or acid mixtures may phthalic anhydride by a mixture of glycerides containing be extracted from well-known oils such as Soya, linseed, fatty acids. cotton seed, etc. According to one of these techniques, glyceral is intro Glycidol which may be obtained according to the duced into a hot saponifiable oil and after monoglyceride known processes of alkyl alcohol epoxidation such as is obtained by alcoholysis, phthalic anhydride is added to the one described in applicant's French Pat. 1,548,678 obtain the modified alkyd resin (German Pat. No. 1,184,- dated Oct. 12, 1967-does not require any special crite 956 dated Sept. 14, 1954). According to a variant of 40 rion of purity. It is the same for phthalic anhydride, these techniques, oil is introduced into the hot polyol. the quality of which is standard quality for alkyd resin According to another process, glycerol, phthalic anhy manufacture. dried and linseed oil are introduced simultaneously and According to a preferred form of the process according the mixture is melted (U.S. Pat. No. 1,888,849). Accord to the invention, an excess of glycidol is used with respect ing to a variant of these techniques linseed oil is replaced 45 to the quantity of phthalic anhydride. This excess is gen by linseed oil fatty acids (U.S. Pat. 1,893,611). erally between 15 and 35% of the quantity theoretically These processes lead to alkyd resins which seldom have necessary to esterify the carboxylic groups present. It is all of the required qualities for their utilization in the advantageously between 20 and 30%. form of coatings and paints; that is, not too high a vis The fatty acid quantities used may vary between large cosity and a low coloration for mass-resin and excellent 50 limits according to the type of resins to be obtained but mechanical characteristics, such as a convenient flexibility they represent generally 30 to 65% of the Weight of the for a high hardness of foils and coatings made from such final mass-resin. CS1S. According to a variant of the process of the invention, It has now been found that modified alkyd resins may a technique of azeotropic fusion may be substituted for be obtained, which do not have the precited disadvantages the simple fusion method described hereinabove. In this and are able to give rise especially to varnishes having a especially advantageous application form, an organic sol great superficial hardness, when, under certain conditions, vent is added to the mixture of unsaturated fatty acids, an epoxy-alcohol, such as glycidol or 2,3-epoxy-1-pro phthalic anhydride and glycidol, then the reaction mass panol, is substituted for glycerol. is heated up to 200-220° C., the solvent being later re The obtaining of good results by using this new raw 60 moved by distillation at the same time as unreacted raw material is the more surprising in that it is usually rec material traces. ommended to remove any glycidol traces in the glycerol There may be used as a solvent any organic liquid used for alkyd resin synthesis (see for example the Ger which is inert with respect to the raw materials; which man Pat. No. 1,184,956 dated Sept. 14, 1954). has a boiling point higher than 100° C; and which is Further, it should be noted that the common general 65 able to form an azeotrope with the water formed during techniques used for alkyd resin fabrication from glycerol, condensation. It is especially advantageous to use hydro such as by alcoholysis and triglyceride oil melting, are carbons such as cycloaliphatic and aromatic hydrocarbons not suitable when an epoxy-alcohol is substituted for this among which it is possible to mention, in an illustrative classical triol. Way, toluene, xylenes, biphenyl, etc. Accordingly, it is an object of the present invention 70 Practically, according to this variant, glycidol, fatty to develop a novel process especially convenient for the acid and phthalic anhydride are loaded into the condensa manufacture of alkyd resins from glycidol and other tion reactor, maintained preferably under an inert atmos 3,586,653 3 4. phere such as nitrogen, at room temperature, then the EXAMPLE 2 mixture is heated up to a temperature of between 110 and 130° C. Because of the exothermicity, the reaction mass From the mass resin obtained according to Example 1, reaches a temperature of the range of 170-190° C. with a coating of the following composition has been formu out further heating at which point the condensation water 5 lated: begins to appear. Then it is heated again progressively to Parts (by weight) reach a temperature of between 200 and 220 C., which Mass alkyd resin ---------------------------- 500 is maintained until the recovery of all of the water. This White-spirit --------------------------------- 500 condensation phase is generally achieved under atmos Cobalt naphthenate (with 6% of metal) -------- 5 pheric pressure. O Lead naphthenate (with 24% of metal) --------- 13 The reaction mass is freed from its organic solvent by Manganese naphthenate (6% of metal) --------- 2.5 distillation, and then any traces of unreacted raw ma terials present are removed, by a final distilltion under This coating, applied in a thickness of 40 microns on vacuum, for example under 2 to 50 mm. Hg. The novel a degreased sheet has been subjected to the following alkyd resins obtained according to the process of the in 5 vention have, as indicated hereinabove, advantageous series of tests: properties which make them especially fit for use in the (a) Drying times field of glycerophthalic paints and varnishes. The hy There were determined the time necessary to produce pothesis may be formulated that the superiority of these a film So that dust does not adhere thereto and also the resins with regard to glycerol alkyd resins and especially 20 time necessary in order that the film remains undamaged the excellent flexibility of the resin and the hardness of when touched. the varnish films are due to the presence in the resin of glycidol homopolymer, which plays the part of a plasti (b) Pendular hardness cizer and which may be cross-linked in the presence of This has been measured with the help of a Persoz pen known curing catalysts. The following examples quoted 25. dulum according to the French standard T-30,016 of in a non-limitative way, show how the invention may be May 1965 ("Pendulum hardness tests of protective paint applied. and varnish films'). EXAMPLE 1. The results obtained are summarized in the table here Into a reactor provided with a stirrer, a thermometer, inafter: a cooler connected to a water collecting vessel, a manom 30 Time eter and an inert gas inlet, there is introduced at one time: Dry to dust --------------------------- hours-- 2 Dry to touch ---------------------------- do-- 8 Parts (by weight) Pendular hardness determined after 65 hours of Phthalic anhydride -------------------------- 740 drying: Linseed oil fatty acids in which acids having two At 20° C.
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