Polymeric composition for preventing the formation of scale during evaporation of sugar juices

Claim 2

A polymeric composition for preventing the formation of scale when evaporating fruit juices, which is characterized in that it contains a mixture of at least three polymers, at least two of said polymers being selected from the group consisting of: (a) polymers and salts of formula I ##STR5## wherein: R 1 is --H, --OH, --CH 3 , --CH 2 OH and/or --Cl R 2 is --CHO, --CH 2 OH and/or --COOCH 2 CH 2 COOH R 3 is --H, --CH 3 and/or --CH 2 OH n 1 is 0.5 to 0.95 m 1 is 0.05 to 0.5 n 1 +m 1 =1, and P 1 is 6 to 300; and wherein said polymers of formula I differ in the mean degree of polymerisation P 1 by at least 20%, based on the value P 1 of the polymer with the lowest mean degree of polymerisation; and at least one further polymer selected from the group consisting of: (b) a polymer or salt of formula II ##STR6## wherein: n 2 is 0.4 to 1.0 m 2 is 0 to 0.6 n 2 +m 2 =1 P 2 is 5 to 4000, or a lower alkyl ester thereof; (c) a polymer or salt of formula III ##STR7## wherein: n 3 is 0.95 to 1 m 3 is 0.05 to 0 n 3 +m 3 =1 P 3 is 6 to 300 R 1 , R 2 and R 3 have the same meaning as in (a); (d) an anionic polyacrylamide or salt of formula IV ##STR8## wherein: n 4 is 0.05 to 0.95 m 4 is 0.95 to 0.05 n 4 +m 4 =1 P is 10 to 500 in which at least one of the polymers is present in an amount of at least 10% by weight and at least two of the polymers are present each in an amount of at least 5% by weight, based on the total amount of the polymers.

Claim 3

A polymeric composition for preventing the formation of scale when evaporating fruit juices, which is characterized in that it contains a mixture of at least three polymers, at least three of said polymers being selected from the group consisting of: (a) polymers and salts of formula I ##STR9## wherein: R 1 is --H, --OH, --CH 3 , --CH 2 OH and/or --Cl R 2 is --CHO, --CH 2 OH and/or --COOCH 2 CH 2 COOH R 3 is --H, --CH 3 and/or --CH 2 OH n 1 is 0.5 to 0.95 m 1 is 0.05 to 0.5 n 1 +m 1 =1, and P 1 is 6 to 300; and wherein said polymers of formula 1 differ in the mean degree of polymerisation P 1 by at least 20%, based on the value P 1 of the polymer with, in each case, the lowest mean degree of polymerisation; said remaining polymers being selected from the group consisting of: (b) a polymer or salt of formula II ##STR10## wherein: n 2 is 0.4 to 1.0 m 2 is 0 to 0.6 n 2 +m 2 =1 P 2 is 5 to 4000, or a lower alkyl ester thereof; (c) a polymer or salt of formula III ##STR11## wherein: n 3 is 0.95 to 1 m 3 is 0.05 to 0 n 3 +m 3 =1 P 3 is 6 to 300 R 1 , R 2 and R 3 have the same meaning as in (a); (d) an anionic polyacrylamide or salt of formula IV ##STR12## wherein: n 4 is 0.05 to 0.95 m 4 is 0.95 to 0.05 n 4 +m 4 =1 P is 10 to 500 in which at least one of the polymers is present in an amount of at least 10% by weight and at least two of the polymers are present each in an amount of at least 5% by weight, based on the total amount of the polymers.

Claim 4

A polymeric composition for preventing the formation of scale when evaporating fruit juices, which is characterized in that it contains a mixture of at least three polymers, at least three of said polymers being selected from the group consisting of: (a) polymers and salts of formula I ##STR9## wherein: R 1 is --H, --OH, --CH 3 , --CH 2 OH and/or --Cl R 2 is --CHO, --CH 2 OH and/or --COOCH 2 CH 2 COOH R 3 is --H, --CH 3 and/or --CH 2 OH n 1 is 0.5 to 0.95 m 1 is 0.05 to 0.5 n 1 +m 1 =1, and P 1 is 6 to 300; and wherein said polymers of formula 1 differ in the mean degree of polymerisation P 1 by at least 20%, based on the value P 1 of the polymer with, in each case, the lowest mean degree of polymerisation; said remaining polymers being selected from the group consisting of: (b) a polymer or salt of formula II ##STR10## wherein: n 2 is 0.4 to 1.0 m 2 is 0 to 0.6 n 2 +m 2 =1 P 2 is 5 to 4000, or a lower alkyl ester thereof; (c) a polymer or salt of formula III ##STR11## wherein: n 3 is 0.95 to 1 m 3 is 0.05 to 0 n 3 +m 3 =1 P 3 is 6 to 300 R 1 , R 2 and R 3 have the same meaning as in (a); (d) an anionic polyacrylamide or salt of formula IV ##STR12## wherein: n 4 is 0.05 to 0.95 m 4 is 0.95 to 0.05 n 4 +m 4 =1 P is 10 to 500 in which at least one of the polymers is present in an amount of at least 10% by weight and at least two of the polymers are present each in an amount of at least 5% by weight, based on the total amount of the polymers.