Patent GB-1010993-A (GB)
Title: Poly(2,2,4,4-tetra-alkylcyclobutylene alkylenedicarboxylate esters) and lubricants containing them
IPC: C08G63/20
Filed: 1962-05-01
Abstract: Lubricants, suitable for use in jet engines, comprise (a) an ester base oil and (b) about 5 to 40% by weight of the base oil of a new complex polyester having the formula <FORM:1010993/C4-C5/1> wherein R1 is the residue of a monohydric alcohol (preferably containing 6 to 12 carbon atoms 1, R2 is an alkylene radical (preferably containing 4 to 8 carbon atoms), R is a lower alkyl group and X is 1-10.  The base oil may be (1) a diester of a dicarboxylic acid such as adipic, azelaic or sebacic acid with an alcohol such as 2-ethyl hexanol, 2:2:4-trimethyl-pentanol or 2-methylbutanol, (2) a diester of a dihydric alcohol such as ethylene glycol, triethylene glycol or 3-methyl-1:5-pentanol with an acid such as propionic, isobutyric, hexanoic or 2-ethylhexanoic acid, or (3) a triester such as the heptanoic or hexanoic ester of trimethylol propane.  The lubricant composition may also contain conventional additives such as rust improves, pour-point depressants and anti-foam additives.ALSO:New complex polyesters of a dicarboxylic acid, a dihydric alcohol and a monohydric alcohol have the formula <FORM:1010993/C3/1> wherein R1 is the residue of a monohydric alcohol (preferably containing 6 to 12 carbon atoms), R2 is an alkylene radical (preferably containing 4 to 8 carbon atoms), R is a lower alkyl group and X is 1-10.  Specified monohydric alcohols are 2:2:4-trimethylpentanol, 2 - ethylhexanol, 2 - methylpentanol, 2 - ethylbutanol, 3 : 5 : 5 - trimethylhexanol, 1 - methylheptanol, lauryl alcohol and C8 branched-chain alcohols obtained by the oxo synthesis.  The esters are made by reacting together the acidic and alcoholic components, preferably at 80-250 DEG C., in the presence of an azeotroping liquid and an esterification catalyst.  In the example, azeloic acid, 2:2:4:4-tetramethyl-1:3-cyclobutanediol and 2:2:4-trimethylpentanol were heated together in the presence of xylol and tetraisopropyl titanate, the final crude product was diluted with heptane, washed first with caustic soda solution and then with water, filtered through a diatomaceous polyesters are compounded with ester base oils to form improved lubricants (see Division C5).ALSO:New complex polyesters, suitable for use in lubricants (see Division C3) have the formula <FORM:1010993/C2/1> wherein R1 is the residue of a monohydric alcohol (preferably containing 6 to 12 carbon atoms), R2 is an alkylene radical (preferably containing 4 to 8 carbon atoms), R is a lower alkyl group and X is 1-10.  Specified monohydric alcohols are 2 : 2 : 4-trimethylpentanol, 2 - ethylhexanol, 2-methylpentanol, 2-ethylbutanol, 3 : 5 : 5-trimethylhexanol, 1-methyl-heptanol, lauryl alcohol and C8 branched-chain alcohols obtained by the oxosynthesis. The esters are made by reacting together the carboxylic acid and the alcoholic components, preferably at 80-250 DEG  C. in the presence of an azeotroping liquid and an esterification catalyst. In the example, azeloic acid, 2 : 2 : 4 : 4-tetramethyl - 1 : 3 - cyclobutanediol and 2 : 2 : 4-trimethylpentanol were heated together in the presence of xylol and tetraisopropyl titanate, the final crude product was diluted with xylene, washed first with caustic soda solution and then with water, filtered through a diatomaceous earth and finally stripped of low boilers.