Patent GB-855001-A (GB)
Title: Ester compositions and process for their manufacture
Inventor: CRITCHLEY STUART WALTER
IPC: H02J9/06
Filed: 1959-05-15
Abstract: Polyesters suitable as lubricants and plasticisers are prepared by heating together in one or more stages, in the presence or absence of an esterification catalyst but in the substantial absence of air, a mixture of adipic and sebacic acids (or their anhydrides) in substantially equimolecular proportions, neopentyl glycol and oxo "isooctanol", the molecular ratio of glycol acids being from 0,4:1,0 to 0,5:1,0 and that of isooctanol acids being from 1,3:1,0 to 1,35:1,0.  It is preferred to first react the acids and the glycol to form the half-ester and then esterify this with the isooctanol. Sodium bisulphite may be used as catalyst and a water entrainer such as benzene may be used.  The product consists of acid-centred complex esters mixed with a substantial proportion of saturated aliphatic diesters and a minor proportion of esters having free hydroxyl and/or free carboxyl groups.  Esterification is considered complete when the acid value is about 1.  The product may be purified by agitation with alumina.  Ester compositions are prepared for comparative purposes from neopentyl glycol, isooctanol and adipic and sebacic acids used singly, and from the acid mixture, isooctanol and 1, 2-propylene glycol.  An example describes a composition comprising polyvinyl chloride, an ester composition according to the invention, white lead and dioctyl phthalate.ALSO:Ester compositions suitable as lubricants and plasticisers are prepared by heating together in one or more stages, in the presence or absence of an esterification catalyst but in the substantial absence of air, a mixture of adipic and sebacic acids or their anhydrides in substantially equimolecular proportions, neopentyl glycol and oxo "isooctanol", the molecular ratio of glycol: acids being from 0,4 : 1,0 to 0,5 : 1,0 and that of isooctanol: acids being from 1,3 : 1,0 to 1,35 : 1,0. It is preferred to first react the acids and the glycol to form the half-ester and then esterify this with the isooctanol.  Sodium bisulphite may be used as catalyst and a water entrainer such as benzene may be used.  The product consists of acid-centred complex esters mixed with a substantial proportion of saturated aliphatic diesters and a minor proportion of esters having free hydroxyl and/or free carboxyl groups. Esterification is considered complete when the acid value is about 1. The product may be purified by agitation with alumina.  Ester compositions are prepared for comparative purposes from neopentyl glycol, isooctanol and adipic and sebacic acids used singly, and from the acid mixture, isooctanol and 1,2-propylene glycol.ALSO:Ester compositions suitable as lubricants are prepared by heating together in one or more stages, in the presence or absence of an esterification catalyst but in the substantial absence of air, a mixture of adipic and sebacic acids or their anhydrides in substantially equimolecular proportions, neopentyl glycol and oxo "isooctanol", the molecular ratio of glycol: acids being from 0.4:1.0 to 0.5:1.0 and that of isooctanol:acids being from 1.3:1.0 to 1.35:1.0.  It is preferred to first react the acids and the glycol to form the half-ester and then esterify this with the isooctanol.  The product consists of acid-centred complex esters mixed with a substantial proportion of saturated aliphatic diesters and a minor proportion of esters having free hydroxyl and/or free carboxyl groups.  Ester compositions are prepared for comparative purposes from neopentyl glycol, isooctanol and adipic and sebacic acids used singly, and from the acid mixture, isooctanol and 1,2-propylene glycol.