Process for producing lactone polymer and an anti-shrinking ther

Details Process for producing lactone polymer and an anti-shrinking ther Process for producing lactone polymer and an anti-shrinking ther

1985-07-31

1987-05-05

Nielsen, Earl

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

Synthetic resins

From carboxylic acid or derivative thereof

528354, 546318, 546327, 549 71, 549484, 549486, 560 81, 560103, 560185, C08G 6310

Patent

active

046634290

ABSTRACT:
A process for producing a lactone polymer which comprises reacting an ester compound synthesized from an alcohol and an acid or acid anhydride thereof with a lactone and a ring-opening polymerization initiator without being accompanied by condensation. The thus produced lactone polymer is effective for preventing shrinkage of thermosetting resins, particularly unsaturated polyester resins.

REFERENCES:
patent: 3502623 (1970-03-01), Hurworth et al.
patent: 3767627 (1973-10-01), Schoen
patent: 3817944 (1974-06-01), Jones
patent: 4071507 (1978-01-01), Schoen
patent: 4281172 (1981-07-01), Knopf

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