Method of making polyester prepolymers

Details Method of making polyester prepolymers Method of making polyester prepolymers

1982-08-12

1983-04-12

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528272, 528480, 528495, 528499, C08G 6322

Patent

active

043799124

ABSTRACT:
A polyester prepolymer having increased reactivity when subjected to molecular weight buildup, such as in solid phase polymerization is prepared by an improved method which includes the steps of: reacting a dicarboxylic acid and a glycol in the presence of a transesterification catalyst to form a reaction mixture containing condensation oligomers; purifying the reaction mixture to remove substantially all of the reaction by-products and residual dicarboxylic acid, glycol and catalyst and to crystallize the condensation oligomers; and polycondensing the oligomers to form a molten prepolymer.

REFERENCES:
patent: T887005 (1971-06-01), Kibler et al.
patent: 3014011 (1961-12-01), Zoetbrood
patent: 3075952 (1963-01-01), Coover et al.
patent: 3342782 (1967-09-01), Barkey
patent: 3390134 (1968-06-01), Kibler
patent: 3544525 (1970-12-01), Balint et al.
patent: 4230818 (1980-10-01), Broughton et al.
patent: 4289874 (1981-09-01), Bockrath

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