Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1997-02-04
1999-06-01
Szekely, Peter A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524376, 524503, 524590, C08K 506
Patent
active
059088869
ABSTRACT:
Disclosed are a method for restoring a water-soluble quenching medium being used, of which the cooling characteristics have been deteriorated during use, to its original condition to have nearly the original cooling characteristics which the fresh medium has before use, and a water-soluble quenching medium thus restored to its original condition to have nearly the original cooling characteristics thereof. The method comprises adding to a quenching bath being used an aqueous solution comprising a water-soluble polymer (B) that has a larger weight average molecular weight than that of the water-soluble polymer (A) existing in the fresh water-soluble quenching medium to be in the fresh bath.
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Nakamura Eiichi
Uchida Hitoshi
Idemitsu Kosan Co. Ltd.
Szekely Peter A.
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