Patent ID: 7011765

Claim:
A heat transfer fluid comprising: (a) at least one mixture of isomers of formula: and (b) at least one polyphenylmethane composition selected from: compositions (I) comprising a mixture of products of formula (A): in which n 1 and n 2 =0 or 1 and which comprises products (A) wherein n 1 +n 2 =0 and products (A) wherein n 1 +n 2 =1, and of products of formula (B): compositions (II) comprising a mixture of two products (C) and (D), in which: the product (C) is a mixture of isomers of formula: where p 1 and p 2 =0.1 and 2, with the proviso that p 1 +p 2 ≦3, and the product (D) is a mixture of isomers of formula: where p′ 1 , p″ 1 , and p 4 =0.1 and 2 p′ 2 , p″ 2 , p 3 , and p 5 =0 and 1 with the proviso that p′ 1 +p″ 1 +p′ 2 +p″ 2 +p 3 +p′ 3 +p 4 +p 5 ≦2; compositions (III) comprising a mixture of two products (A1) and (A2) wherein: the product (A1) is a mixture of isomers of formula: where m 1 and m 2 =0, 1 or 2, with the proviso that m1+m 2 ≦3, the product (A2) is a mixture of isomers of formula: where q 1 and q 2 =0, 1 or 2, with the proviso that q 1 +q 2 ≦3, and in that at least one of the compounds (A1) and (A2) comprises an isomer having three benzene nuclei; and compositions (IV) comprising the two products (A1) and (A2) and at least one compound selected from the following products (E1), (E2) or (E3): (E1) is an isomer or a mixture of isomers of formula: where r′ 1 , r″ 1 , and r 4 =0, 1 or 2, r′ 2 , r″ 2 , r 3 , r′ 3 , and r 5 =0 and 1, with the proviso that r′ 1 +r″ 1 +r′ 2 +r″ 2 +r″ 3 +r′ 3 +r 4 +r 5 is less than or equal to 2, R 1 and R 2 represent a hydrogen atom, (E2) is an isomer or a mixture of isomers of the same general formula as (E1) except that R 1 and R 2 represent methyl and he indices r are replaced by s and have the same meaning, and (E3) is an isomer or a mixture of isomers of the same general formula as (E1) except that R 1 and R 2 are different and represent a hydrogen atom or a methyl radical and the indices r are replaced by t and have the same meaning.