Abstract:
The invention deals with the preparation, compositions, and application of certain high molecular weight hydrophobic citrate polyesters of guerbet alcohols and their alkoxylates, which are useful in polycarbonate processing.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention deals with the preparation, compositions, and application of certain high molecular weight hydrophobic guerbet citrate polyesters which are useful in polycaronate processing. 
     2. Description of the Art Practices 
     It is known that esters of simple alcohols may be used for various purposes including polycarbonate processing. In U.S. Pat. No. 3,784,595 issued Jan. 8, 1974 to Schirmer et al polycarbonate molding compositions are shown which are based on the esters of a trihydric alcohol and a saturated aliphatic carboxylic acid, U.S. Pat. No. 4,065,436 issued to Adelmann in December 1977 describes thermoplastic molding compositions containing a mold release agent which is an ester of a saturated aliphatic carboxylic acid having from 10 to 20 carbon atoms per molecule and an aromatic hydroxy compound containing from 1 to 6 hydroxyl groups. 
     It is also known from U.S. Pat. No. 4,097,435 issued June 27, 1978 to Rawling et al that montanic acid ester waxes may be employed in polycarbonate molding compositions. U.S. Pat. No. 4,131,575 issued Dec. 26, 1978 to Adelmann describes in combination with aromatic polycarbonates, mold release agents which are the esters of saturated aliphatic carboxylic acids with alcohol containing from 4 to 6 hydroxyl groups. The disclosures of U.S. Pat. No. 4,131,575 are also found in the related British Patent No. 1,490,467 published Nov. 2, 1977. U.S. Pat. No. 4,143,024 issued Mar. 6, 1979 to Adelmann et al describes aromatic polycarbonate based thermoplastic molding compositions utilizing as a mold release agent the ester of a saturated aliphatic carboxylic acid containing from 10 to 20 carbon atoms per molecule and an aromatic hydroxyl compound from having 1 to 6 hydroxyl groups. 
     Lindner et al, U.S. Pat. No. 4,425,458, issued Jan. 10, 1984, teaches that specific guerbet alcohol diesters containing from 16 to 40 carbon atoms total in the guerbet alcohol molecule can be used as mold release agents in polycarbonate products. 
     U.S. Pat. #4,767,815 issued Aug. 30, 1988 to O&#39;Lenick teaches that two mole equivalents of a guerbet alcohol can be reacted with butryolactone to form a ether ester which can be used as a polycarbonate lubricant. 
     General disclosures of polycarbonate technology are found in U.S. Pat. No. 4,081,495 issued Mar. 28, 1978 to Freitag et al. Similar general disclosures are also found in U.S. Pat. No. 4,007,150 issued to Adelmann et al on Feb. 8, 1977. 
     To the extent that each of the foregoing patents is relevant to the present invention they are herein specifically incorporated by reference. Throughout the specification and claims, percentages and ratios are by weight, pressures are gauge and temperatures are Celsius unless otherwise noted. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to a series of high molecular weight highly branched citrate esters, useful as a mold release agent for polycarbonate resin compositions. The esters are the reaction product of a guerbet alcohol or a guerbet alcohol alkoxylate, citric acid and in a subsequent step a crosslinking diacid. 
     Another aspect of the invention is a novel guerbet triester of citric acid, which is the precursor molecule for the compounds of this invention. 
     Another apsect of the invention is a proces used to prepare of the esters. Still another aspect of the invention is the process for the use of these novel products in polycarbonate and other thermoplastic molding processes. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention described molecules that are guerbet citrate polyoxyalkylene esters. The guerbet alcohol portion of the present invention is particularly important in that polycarbonate resins have a high requirement for clarity as they are often used to form clear articlesincluding safety glasses. Unfortunately, the polycarbonate resins tend to fail to release when molded, therefore agents must be employed to assist in releasing the polycarbonate resin from the mold. A substantial difficulty which has been found in the art is to ensure that the polycarbonate resin is not adversely affected by the mold release agent. Incorporation of polyoxypropylene and or polyoxyethylene into the ester results in increased polymer stability by minimizing free radical degradation and thereby increasing optical stability properties of the polycarbonate. 
     The molecules of this invention conform to the following generic structure: ##STR1##wherein: 
     R is selected from; ##STR2##or ##STR3## 
     n has a value from 1 to 15; 
     m and o independently range from 0 to 5; 
     R 1 , R 2  and R 3  are independently selected from ##STR4##wherein R 4  and R 5  may be the same or different saturated aliphatic groups; EO is ethylene oxide: PO is a propylene oxide group; x, y and z are independently between 1 and 10. Ethylene oxide and propylene oxide may be added in blocks or random manner by premixing the oxides. 
     In a preferred range R 4  and R 5  each independently range from C 6  H 13  to C 10  H 21  and x, y and z each independently range from 0 to 10. 
     It will be observed in the present invention that the mold release agents of this invention result in polycarbonate products in which the clarity isnot adversely affected. The guerbet citrate esters of the present inventionare observed to migrate sufficiently from the polycarbonate resin to the surface of the mold to effect release. These guerbet citrate polyoxyalkylene esters do not substantially sweat out or collect on the surface of the molded articles. Sweating out cause hazing which is a disadvantage for mold mold release agents. Another important aspect in working with mold release agents is the volatility of the compounds. It will of course be observed that the molding process requires large amountsof heat to liquefy the polycarbonate. This turn requires low volatility of the mole release agent so that the mold release agent is not lost to the atmosphere before it can function. It is also noted that an air pollution problem within a plant may arise where a mold release agent of high volatility is utilized. The products of the present invention will be observed to have low volatility thus presenting a distinct advantage over low molecular weight materials. 
     Guerbet alcohols have been known since the 1890&#39;s when Marcel Guerbet firstsynthesized these materials (M. Guerbet, C.R. Acad. Sci. Paris, 128, 511; 1002 (1899)). These materials are high in molecular weight and are liquid even at very low temperatures. 
     The guerbet alcohols used in a preferred embodiment of the present invention contain from about 12 to 40 carbon atoms (total) in the guerbet alcohol molecule. 
     It is known in the art that guerbet alcohols may be formed from the same ordifferent alcohols i.e. a homo or hetero system. That is, a guerbet alcoholis the condensation product of two molecules joined at the beta carbon of the alcohol which has retained the hydroxyl functionality. The resultant product is therefore a highly branched primary alcohol containing a singlehydroxyl group. It is possible to obtain mixtures of alcohols and to condense them into hetero systems. It is also possible to obtain products which are guerbet alcohols from a short chained alcohol. It is desired forreasons of polarity, compatibilty with and solubility in the polycarbonate system that homo-guerbet alcohols having between 16 and 40 carbon atoms beused. 
     The polycarbonates with which the present guerbet citrate esters are effective mold release agents include homopolycarbonates and copolycarbonates which are based, for example, or one or more of the following bisphenols: hydroquinone, resorcinol, dihydroxydiphenyls, bis-(hydroxyphenyl)-alkanes. bis-(hydroxyphenyl)-cycloalkanes, bis-(hydroxylphenyl)-sulphides, bis-(hydroxyphenyl)-ethers, bis-(hydroxylphenyl)-ketones bis-(hydroxyphenyl)-sulphoxides, bis-(hydroxyphenyl)-sulphones and alpha, alpha-bis(hydroxyphenyl)-diisopropyl-benzenes, as well as their nuclear alkylated and nuclear-halogenated compounds. These are further suitable aromatic dihydroxy compounds are described, for example, in U.S. Pat. Nos.3,028,365, 2,999,835, 3,148,172, 3,271,368, 2,991,273, 3,271,367, 3,280,078, 3,014,891 and 2,999,846, in German Offenlegungsschriften (German Published Specifications) Nos. 1,570,703, 2,063,050, 2,063,052, 2,211,956, and 2,211,957, in French Patent Specification No. 1,561,518 andin the monograph &#34;H. Schnell, Chemistry and Physics of Polycarbonates, Interscience Publishers, New York, 1964&#34;. 
     Preferred bisphenols are those of the formula I shown below: ##STR5##in which R is identical or different and denotes H. C 1  -alkyl, Cl or Br, and in which X is a bond, C 1  C 8  -alkylene, C 2  -alkylidene, C 5  -C 15  cycloalkylene, C 5  -C 15  -cycloalkylidene, --SO-- or formula II shown below: ##STR6## 
     Examples of these bisphenols are 4,4&#39;-dihydroxydiphenyl, 2,2-bis-(4-hydroxyphenyl)-propane, 2,4-bis(4-hydroxyphenyl)-2-methylbutane, 1,1-bis-(4-hydroxyphenyl)-cyclohexane, a,a-bis(4-hydroxyphenyl)-p-diisopropylbenzene. 2,2-bis-(3-methyl-4-hydroxyphenyl)-propane, 2,2-bis-(3-chloro-4-hydroxyphenyl)-propane, bis-(3,5-dimethyl-4-hydroxyphenyl)-propane, bis(3,5)-dimethyl-4-hydroxyphenyl)-2-methylbutane, 1,1-bis-(3,5-dimethyl-4-hydroxyphenyl)-cyclohexane, a,a-bis-(3,5-dimethyl-4-hydroxyphenyl)-p-diisopropyl-benzene, 2,2-bis-(3,5-dichloro-4-hydroxyphenyl)-propane and 2,2-bis(3,5-dibromo-4-hydroxyphyenyl)-propane. 
     Examples of particularly preferred bisphenols are: 2,2-bis-(4-hydroxyphenyl)-propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dichloro-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-bibromo-4-hydroxyphenyl)-propane, and 1,1-bis-(4-hydroxyphenyl)-cyclohexane. 
     Preferred aromatic polycarbonates are those which are based on one or more of the bisphenols mentioned as being preferred. Particularly preferred copolycaronates are those based on 2,2-bis-(4hydroxyphenyl)-propane and one of the other bisphenols mentioned as being particularly preferred. Further particularly preferred polycarbonates are those based solely on 2,2-bis-(4-hydroxyphenyl)-propane or 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane. 
     The aromatic polycarbonates can be prepared in accordance with known processes, such as, for example, in accordance with the melt trans-esterification process from bisphenols and diphenyl carbonate and the two-phase boundary process from the bisphenols and phosgene, as described in the above-mentioned literature. 
     The aromatic high-molecular weight polycarbonates can be branched due to the incorporation of small amounts, preferably of between 0.05 and 2.0 mol% (relative to diphenols employed), of trifunctional or more than trifunctional compounds, especially compounds with three of more phenolic hydroxyl groups. 
     Polycarbonates of this type are described, for example, in German Offenlegungsschriften (German Published Specifications) Nos. 1,570,533, 1,595,762, 2,116,974 and 2,113,347; British Patent Specification No. 1,079,821; U.S. Pat. No. 3,544,514 and German Patent Application No. P25 00 092.4. 
     Somes examples of compounds with three or more than three phenolic hydroxylgroups which can be used are phloroglucinol, 4,6-dimethyl-2,4,6-tri-(4,hydroxyphenyl)-heptane, 2,4,6-trimethyl-2,4,6-tri-(4-hydroxyphenyl)-heptane, 1,4,5-tri-(4-hydroxyphenyl)-benzene, 1,1,1-tri-(4-hydroxyphenyl)-ethane, tri-(4-hydroxyphenyl)-phenylmethane, 2,2-bis-(4,4-bis-(4-hydroxyphenyl)-cyclohexyl)-propane, 2,4-bis-(4-hydroxyphenylisopropyl)-Phenol, 2,6-bis-(2-hydrox-5-methylbenzyl)-4-methyphenol, 2-(4-hydroxyphenol), 2-2,4dihydroxyphenyl)-propane, hexa(4-4-hydroxyphenylisopropyl)phenyl)orthoterephthalic acid ester, tetra-(4-hydroxyphenyl)-methane and 1,4-bis-((4&#39;,4&#34;-dihydroxytriphenyl)methyl)-benzene. Some of the other trifunctional compounds are 2,4-dihyroxybenzoic acid, trimesic acid, cyanuric chloride and 3,3-bis-(4-hydroxyphyenyl)-2oxo-2,3-dihydroindole. 
     The aromatic high-molecular polycarbonates should as a rule have mean weight-average molecular weights M of at least 10,000; especially of 10,000 to 200,000; preferably of 20,000 to 80000; determined by measuring the relative viscosity in CH 2  Cl 2  at 25 degrees c. and a concentration of 0.5% by weight. 
     The thermoplastic polycarbonate molding compositions find use in several areas. Such examples of use for the polycarbonates of the present invention utilizing the mold release agents include the electrical industry and the optical field such as the stripping of sockets, coiled bodies, complicated housings, projector housings, switch cabinet bottoms and other similar applications. 
     The mold release agent of the present invention (the guerbet polyoxyalkylene citrate ester) is utilized with the polycarbonate in the manner of similar prior polycarbonate formulations. The level of use of the guerbet citrate ester to the polycarbonate is from about 0.25% to about 1.0%; preferably from about 0.1% to about 0.25% by weight of the total polycarbonate compositions. 
     Raw Materials 
     Guerbet Alcohols and Alkoxylates 
     The Guerbet alcohols used as raw materials are items of commerce and are prepared by processes known to those skilled in the art. They are producedby several manufacturers including; Exxon Chemicals Corporation (Darien, Conn.) and Henkel Corporation (Ambler, Pa.). 
     The alcohols were ethoxylated using standard procedures known to those skilled in the art. Reference is drawn to U.S. Pat. No. 4,731,190 to O&#39;Lenick, Jr. et al. The reference teaches the alkoxylation processes for guerbet alcohols. 
     
         ______________________________________ ##STR7##Example  R.sup.4  R.sup.5                    x       y    z______________________________________1        C8       C10    0       0    02        C8       C10    1       1    13        C8       C10    0       5    24        C8       C10    5       5    55        C8       C10    10      10   106        C11      C13    0       0    07        C11      C13    1       1    18        C11      C13    0       5    29        C11      C13    5       5    510       C11      C13    10      10   1011       C16      C18    0       0    012       C16      C18    1       1    113       C16      C18    0       5    214       C16      C18    5       5    515       C16      C18    10      10   10Citric Acid ##STR8##Fatty Diacids (for crosslinking)Adipic Acid      HO(O)C(CH2).sub.4 C(O)OHSuccinic Acid    HO(O)C(CH2).sub.2 C(O)OHDodecanedioic Acid            HO(O)C(CH2).sub.10 C(O)OHMalic Acid       HO(O)CCHCHC(O)OHMalonic Acid     HO(O)C(CH2).sub.3 C(O)OHAzelaic Acid     HO(O)C(CH2).sub.5 C(O)OH______________________________________ 
    
     The compounds of this invention are prepared by reacting citric acid (anhydrous) with a guerbet alcohol or guerbet alcohol alkoxylate to give an intermediate product which is reacted with a polyacid to provide a crosslinked ester. Suitable diacids include: adipic, succinic, maleic, azelic, dodecanedioic, and fumaric. 
     Reaction Conditions 
     The esterification can be run without catalyst; however, when no catalysts used reaction rates are inefficient. Standard esterification catalysts aregenerally used at concentrations of between 0.05% to 0.50% with a preferredrange of 0.1% to 0.3%. Catalysts which are effective include but are not limited to: sulfuric acid, p-toluene sulfonic acid, methane sulfonic acid,tin metal, zinc metal, titanium metal, organo titianates, organo tin compounds, organo zinc compounds, zinc oxide, magnesium oxide, calcium oxide, etc. Preferred is stannous oxylate. The reaction is conducted at between 140 and 240 C. under an inert nitrogen blanket. Preferred temperature range is between 180 and 210 C. Water is removed from the reaction which is done using a nitrogen sparge or vacuum of up to 10 mm. 
     The following are suggested embodiments of present invention. 
     EXAMPLE 16 
     To a suitable reaction vessel is added 900.0 grams of guerbet alcohol example 1, 192.0 grams of citric acid and 2.0 grams of stannous oxylate catalyst. A nitrogen sparge is then applied. Next the temperature is increased to 160-200 C. and by-product water begins to distill off. Vacuumis applied to keep the water distilling. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained withoutand additional purification. 
     EXAMPLE 17 
     To a suitable reaction vessel is added 1341.0 grams of guerbet alkoxylate example #2, 192.0 grams of citric acid, and 2.0 grams of tin oxide catalyst. The temperature is then increased to 160-200 C. while a nitrogensparge is applied. Water begins to distill off at about 160 C. Vacuum is applied to keep the by-product water distilling. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additional purification. 
     EXAMPLE 18 
     To a suitable reaction vessel is added 192.0 grams of citric acid, 2049.0 grams of the guerbet alkoxylate example #3 and 2.0 grams of p toluene sulfonic acid catalyst. The temperature is then increased to 160-200 C. A nitrogen sparge is applied during heating. Water begins to distill off at about 160 C. Vacuum is applied to keep the by-product water distilling. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additional purification. 
     EXAMPLE 19 
     To a suitable reaction vessel is added 192.0 grams of citric acid, 3105.0 grams of guerbet alkoxylate example #4 and 4.0 grams of stannous oxylate catalyst. A nitrogen sparge is then applied. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuumis applied to keep the water distilling. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained withoutand additional purification. 
     EXAMPLE 20 
     To a suitable reaction vessel is added 5310.0 grams of guerbet alkoxylate example #5; 192.0 grams of citric acid and 5.0 grams of Tyzor catalyst. The temperature is then increased by 160-200 C., under nitrogen sparge. By-product water begins to distill off. Vacuum is applied to keep the water distilling. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 21 
     To a suitable reaction vessel is added 192.0 grams of citric acid, 2.0 grams of stannous oxylate catalyst and 1149.0 grams of guerbet alcohol example #6. A nitrogen sparge is applied. The temperature is then increased to 160-200 C. and water begins to distill off. Vacuum is appliedto keep the water distilling. When 97% of the theoretical by-product water is removed the reaction is cooled. The desired product is obtined without and additional purification. 
     EXAMPLE 22 
     To a suitable reaction vessel is added 192.0 grams of citric acid, 2.0 grams of p. toluene sulfonic acid catalyst and 1590.0 grams of the guerbetalkoxylate example #7. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 23 
     To a suitable reaction vessel is added 192.0 grams of citric acid, 2298.0 grams of guerbet alkoxylate example #8 and 2.0 grams of esterification catalyst. The temperature is then increased to 160-200 C. under nitrogen sparge. Water begins to distill off at about 160 C. Vacuum is applied to keep the by-product water distilling. When 97% of the theoretical water isremoved the reaction is cooled. The desired product is obtained without andadditional purification. 
     EXAMPLE 24 
     To a suitable reaction vessel is added 192.0 grams of citric acid. 3354 grams of guerbet alkoxylate example #9 and 2.0 grams of p toluene sulfonicacid catalyst. The temperature is then increased to 160-200 C. and by-product water begins to distill. Vacuum is applied to keep the water distilling. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additional purification. 
     EXAMPLE 25 
     To a suitble reaction vessel is added 5550.0 grams of guerbet alkoxylate example #10, 192.0 grams of citric acid and 5.0 grams of stannous oxylate catalyst. A Nitrogen sparge is applied. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling. When 97% of the theoretical water isremoved the reaction is cooled. The desired product is obtained without andadditional purification. 
     EXAMPLE 26 
     To a suitable reaction vessel is added 192.0 grams of citric acid, 1569.0 grams of guerbet alcohol example #11, 2.0 grams of an esterification catalyst. The temperature is then increased to 160-200 C. and by-product water begins to distill. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additional purification. 
     EXAMPLE 27 
     To a suitable reaction vessel is added 2010.0 grams of guerbet alkoxylate example #12; 192.0 grams of citric acid and 2.0 grams of stannous oxylate catalyst. A nitrogen sparge is applied. The temperature is then increased to 160-200 C. and by-product water begins to distill. Vacuum is applied tokeep the water distilling off. When 97% of the theoretical water is removedthe reaction is cooled. The desired product is obtained without and additional purification. 
     EXAMPLE 28 
     To a suitable reaction vessel is added 192.0 grams of citric acid, 2.0 grams of stannous oxylate catalyst, and 2718.0 grams of guerbet alkoxylateexample #13. The temperature is then increased to 160-200 C., under a nitrogen sparge. Water begins to distill. Vacuum is applied to keep the by-product water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additional purification. 
     EXAMPLE 29 
     To a suitable reaction vessel is added 192.0 grams of citric acid. 2.0 grams of p toluene sulfonic acid catalyst and 3774.0 grams of guerbet alkoxylate example #14. The temperature then is increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 30 
     To a suitable reaction vessel is added 5979.0 grams of guerbet alkoxylate example #15, 2.0 grams of stannous oxylate catalyst and 192.0 grams of citric acid. The temperature is then increased to 160-200 C., under nitrogen sparge. Water begins to distill. Vacuum is applied to keep the by-product water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additional purification. 
     EXAMPLE 31 
     To a suitable reaction vessel is added 192.0 grams of citric acid, 2.0 grmsof p toluene sulfonic acid catalyst, 450.0 grams of guerbet alcohol example #1; and 2,989.5 grams of guerbet alkoxylate example #15. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additional purification. 
     EXAMPLE 32 
     To a suitable reaction vessel is added 192.0 grams of citric acid, 2.0 grams of stannous oxylate catalyst, 775 grams of guerbet alkoxylate example #10, and 784.5 grams of guerbet alcohol example #11. A nitrogen sparge is then applied. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 33 
     To a suitable reaction vessel is added 192.0 grams of citric acid, 300 grams of guerbet alcohol example #1, 379.0 grams of guerbet alcohol example #6, 517.8 grams of guerbet alcohol example #11 and 12.0 grams of stannous oxylate catalyst. A nitrogen sparge is then applied. The temperature is increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additional purification. 
     EXAMPLE 34 
     To a suitable reaction vessel is added 192.0 grams of citric acid, 2.0 grams of tin oxide catalyst, 1768.0 grams of guerbet alkoxylate example #5, 1831.0 grams of guerbet alkoxylate example #10, and 1973 grams of guerbet alkoxylate example #15. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additional purification. 
     EXAMPLE 35 
     To a suitable reaction vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst, 436.0 grams of guerbet alkoxylate ester example #16. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 36 
     To a suitable reaction vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst, 583.0 grams of guerbet alkoxylate ester example #17. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 37 
     To a suitable vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst. 775.0 grams of guerbet alkoxylate ester example #18. The temperature is then increased to 160-200 C. and by-product water begins todistill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additional purification. 
     EXAMPLE 38 
     To a suitable reaction vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst, 1171.0 grams of guerbet alkoxylate ester example #19. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 39 
     To a suitable reaction vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst, 1906.0 grams of guerbet alkoxylate ester example #20. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 40 
     To a suitable reaction vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst, 520.0 grams of guerbet alkoxylate ester example #21. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 41 
     To a suitable reaction vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst, 667.0 grams of guerbet alkoxylate ester example #22. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 42 
     To a suitable reaction vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst, 859.0 grams of guerbet alkoxylate ester example #23. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 43 
     To a suitable reaction vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst, 1255.0 grams of guerbet alkoxylate ester example #24. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 44 
     To a suitable reaction vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst, 1990.0 grams of guerbet alkoxylate ester example #25. The temperature is then increased to 160-200 C. and by-products water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 45 
     To a suitable reaction vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst, 660.0 grams of guerbet alkoxylate ester example #26. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 46 
     To a suitable reaction vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst, 837.0 grams of guerbet alkoxylate ester example #27. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 47 
     To a suitable reaction vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst, 999.0 grams of guerbet alkoxylate ester example #28. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 48 
     To a suitable reaction vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst, 1395.0 grams of guerbet alkoxylate ester example #29. The temperature is then increased to 160-200 C. and by-production water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 49 
     To a suitable reaction vessel is added 146.0 grams of adipic acid, 2.0 grams of tin oxide catalyst, 2130.0 grams of guerbet alkoxylate ester example #30. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 50 
     To a suitable reaction vessel is added 230.0 grams of dodecanedioic acid, 2.0 grams of tin oxide catalyst, 436.0 grams of guerbet alkoxylate ester example #16. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 51 
     To a suitable reaction vessel is added 230.0 grams of dodecanedioic acid, 2.0 grams of tin oxide catalyst, 583.0 grams of guerbet alkoxylate ester example #17. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 52 
     To a suitable reaction vessel is added 230.0 grams of dodecanedioic acid, 2.0 grams of tin oxide catalyst, 775.0 grams of guerbet alkoxylate ester example #18. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 53 
     To a suitable reaction vessel is added 116.0 grams of malic acid, 2.0 gramsof tin oxide catalyst. 1171.0 grams of guerbet alkoxylate ester example #19. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off.When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additional purification. 
     EXAMPLE 54 
     To a suitable reaction vessel is added 116.0 grams of malic acid, 2.0 gramsof tin oxide catalyst. 1906.0 grams of guerbet alkoxylate ester example #20. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off.When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additional purification. 
     EXAMPLE 55 
     To a suitable reaction vessel is added 160.0 grams of azelaic acid, 2.0 grams of tin oxide catalyst, 520.0 grams of guerbet alkoxylate ester example #21. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 56 
     To a suitable reaction vessel is added 160.0 grams of azelaic acid, 2.0 grams of tin oxide catalyst, 667.0 grams of guerbet alkoxylate ester example #22. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 57 
     To a suitable reaction vessel is added 160.0 grams of azelaic acid, 2.0 grams of tin oxide catalyst, 859.0 grams of guerbet alkoxylate ester example #23. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 58 
     To a suitable reaction vessel is added 132.0 grams of malonic acid, 2.0 grams of tin oxide catalyst, 1255.0 grams of guerbet alkoxylate ester example #24. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 59 
     To a suitable reaction vessel is added 132.0 grams of malonic acid, 2.0 grams of tin oxide catalyst, 1990.0 grams of guerbet alkoxylate ester example #25. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 60 
     To a suitable reaction vessel is added 132.0 grams of malonic acid, 2.0 grams of tin oxide catalyst, 660.0 grams of guerbet alkoxylate ester example #26. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 61 
     To a suitable reaction vessel is added 230.0 grams of dodecanedioic acid, 2.0 grams of tin oxide catalyst, 837.0 grams of guerbet alkoxylate ester example #27. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 62 
     To a suitable reaction vessel is added 230.0 grams of dodecanedioic acid, 2.0 grams of tin oxide catalyst, 999.0 grams of guerbet alkoxylate ester example #28. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 63 
     To a suitable reaction vessel is added 230.0 grams of dodecanedioic acid, 2.0 grams of tin oxide catalyst, 1395.0 grams of guerbet alkoxylate ester example #29. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 64 
     To a suitable reaction vessel is added 230.0 grams of dodecanedioic acid, 2.0 grams of tin oxide catalyst, 2130.0 grams of guerbet alkoxylate ester example #30. The temperature is then increased to 160-200 C. and by-product water begins to distill off. Vacuum is applied to keep the water distilling off. When 97% of the theoretical water is removed the reaction is cooled. The desired product is obtained without and additionalpurification. 
     EXAMPLE 65 
     A suggested utilization of the guerbet citrate ester of Examples 35-64 is conducted by using 0.12% by weight of the guerbet citrate ester, and following the general procedure given at Column 6 of U.S. Pat. No. 4,065,436. 
     By so following the general teachings of the aforementioned reference it will observed that the various guerbet citrate esters of the guerbet alcohols and their alkoxylates of the present invention give polycarbonates of high clarity and low volatility.