Patent ID: 8048264

Claim:
A stabilizing composition comprising following components (A) a copolymer having the following formula wherein R 1 is a hydrogen atom or an alkyl group containing 1 to 12 carbon atoms, R 2 is —COOM or —CH 2 COOM, M is a hydrogen atom, an alkali metal ion, an alkaline earth metal ion, an ammonium ion or a mixture thereof, n, m and k are molar ratios of corresponding monomers, wherein n is 0 to 0.95, m is 0.05 to 0.9, and k is 0 to 0.8, and (n+m+k) equals 1, and the weight average molecular weight is between 500 and 20,000,000 g/mol, (B) a chelating agent, and (C) an alkaline earth metal compound, wherein the three components (A), (B) and (C) are present in the weight ratio of (A):(B):(C) of 10 to 60:20 to 70:10 to 50.