| 摘要 |
1,266,322. Polyesters and polyesteramides; polyurethanes. LAPORTE CHEMICALS Ltd. 15 May, 1969 [22 May, 1968], No. 24519/68. Headings C3C, C3P and C3R. A linear polyester is produced by the controlled reaction of an epoxide, a polycarboxylic acid anhydride and a lactone in the presence of an etheriflcation inhibitor and preferably an initiator containing at least one active hydrogen atom attached to sulphur, oxygen or nitrogen, to give a polyester having at least 80% of its repeating groups comprising polyester groups of the type and polylactone groups of the type joined to the polyester groups by ester linkages, wherein x and y are small integers whose values are not biased by the position of the polyester or polylactone groups along the chain and A, E and X are the residues of the anhydride, epoxide and lactone respectively. The corresponding acid, glycol and hydroxy carboxylic acid could be substituted for the above reactants to give the same residues. The reaction is controlled such that the epoxide, anhydride and lactone each react at substantially constant rate during the reaction. A portion of the groups "E" may be derived from an aziridine giving a polyesteramide product. The polyester, when hydroxyl terminated, may be reacted with a compound having at least two iso-cyanate groups to give an isocyanateterminated urethane prepolymer. Specified reactants are: epoxides-oxiranes or oxetanes substituted with alkyl or aryl groups which may be further substituted with alkyl, aryl, alkoxy, aryloxy or ester groups or chlorine; lactones-those containing a -(CH 2 ) n - or -(CR 2 ) n - chain where n is 4 to 7 and R is methyl, ethyl, n-propyl, isopropyl, hydrogen, chlorine or bromine, the total number of carbon atoms not exceeding 12 and the total number of halogen atoms not exceeding 2; anhydridesthose of dicarboxylic acids, possibly in admixture with those of tetra or hexa carboxylic acids. The polyesters may be used as plasticizers for P.V.C. (Examples 8, 18-21, 29 and 30) or in admixture with a butylated melamine-formaldehyde resin in the preparation of soft paint films. |
