Melt processing recovery of high purity polymeric antioxidants

Details Melt processing recovery of high purity polymeric antioxidants Melt processing recovery of high purity polymeric antioxidants

1976-06-09

1978-11-28

Pertilla, Theodore A.

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

Synthetic resins

Treating polymer containing material or treating a solid...

252404, 260 96R, 528219, 528218, 528501, C08G 6540, C08K 513

Patent

active

041275640

ABSTRACT:
Diolefin-phenolic copolymeric antioxidants having solvent contents below 50 ppm and containing less than 0.3% of materials of molecular weight below 500 Daltons are recovered directly from a crude reaction product by removing catalyst and adjusting the reaction solvent content to 10-50% and thereafter subjecting the product to melt processing under volatilizing conditions at 200.degree.-425.degree. C, 0.1 to 10 mm Hg absolute, a surface area of at least 4 cm.sup.2 /g for from 0.5 to 7.5 minutes and then recovering the purified product.

REFERENCES:
patent: 3996160 (1976-12-01), Dale et al.
patent: 3996198 (1976-12-01), Wang
patent: 3996199 (1976-12-01), Weinshenker

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