NY -- Standard & Poor's CreditWire 7/23/96 -- Standard & Poor's today has affirmed its double-`A' claims-paying ability rating of Allstate Insurance Company (AIC) and maintains the "developing" CreditWatch listing of Allstate Reinsurance Co., Ltd.'s (ARCO) double-`A' claims-paying ability rating, following today's announcement that Allstate Corp. (Allstate), the parent of AIC, has signed a definitive agreement to sell its domestic reinsurance business to SCOR, AS. The claims-paying rating of ARCO was placed on CreditWatch with developing implications on May 1996 following Allstate's announcement that it was reviewing the future direction of its reinsurance operations. Allstate historically has housed its domestic reinsurance business with AIC, while all international reinsurance business resided in ARCO. Under the terms of the SCOR agreement, only