Provided are biocidal compositions comprising: a hydroxymethyl-substituted phosphorus compound and 2-methyl-1,2-benzisothiazolin-3-one. The compositions are useful for controlling microorganisms in aqueous or water-containing systems.

The present invention provides for the use of polyurethane dispersions to adhere functional chemicals on to proppants. The present invention offers a way of assuring that the chemical is released in the formation and is released slowly over time.

The present invention provides for the use of polyurethane dispersions to adhere functional chemicals on to proppants. The present invention offers a way of assuring that the chemical is released in the formation and is released slowly over time.

An antimicrobial material comprising a tetraalkylphosphonium ionic liquid and metal nanoparticles.

An antimicrobial material comprising a tetraalkylphosphonium ionic liquid and metal nanoparticles.

A synergistic composition comprising a THP salt and a biopenetrant, in which the biopenetrant comprises a polymer of an unsaturated carboxylic acid or a copolymer of an unsaturated carboxylic acid with a sulphonic acid, said polymer or copolymer being terminated by a mono- or diphosphonated unsaturated carboxylic acid group or having such monomers incorporated into the polymer backbone. This composition acts synergistically to enhance the biocidal efficacy of the THP salt against both planktonic (free-swimming) and sessile (attached) bacteria, and also acts synergistically to enhance the efficacy of the THP salt in the dissolution of iron sulphide scale.

A synergistic composition comprising a THP salt and a biopenetrant, in which the biopenetrant comprises a polymer of an unsaturated carboxylic acid or a copolymer of an unsaturated carboxylic acid with a sulphonic acid, said polymer or copolymer being terminated by a mono- or diphosphonated unsaturated carboxylic acid group or having such monomers incorporated into the polymer backbone. This composition acts synergistically to enhance the biocidal efficacy of the THP salt against both planktonic (free-swimming) and sessile (attached) bacteria, and also acts synergistically to enhance the efficacy of the THP salt in the dissolution of iron sulphide scale.

A synergistic composition comprising a THP salt and a biopenetrant, in which the biopenetrant comprises a polymer of an unsaturated carboxylic acid or a copolymer of an unsaturated carboxylic acid with a sulphonic acid, said polymer or copolymer being terminated by a mono- or diphosphonated unsaturated carboxylic acid group or having such monomers incorporated into the polymer backbone. This composition acts synergistically to enhance the biocidal efficacy of the THP salt against both planktonic (free-swimming) and sessile (attached) bacteria, and also acts synergistically to enhance the efficacy of the THP salt in the dissolution of iron sulphide scale.

A composition comprising: (a) tetrakis(hydroxymethyl)phosphonium sulfate (THPS); (b) water; and (c) methanol; wherein the weight percentages of (a), (b) and (c) are within the area on a ternary phase diagram for (a), (b) and (c) bounded by four points: (A) 5% THPS/58% water/37% methanol; (B) 5% THPS/36% water/59% methanol; (C) 65% THPS/27% water/8% methanol; and (D) 65% THPS/29% water/6% methanol.

A composition comprising: (a) tetrakis(hydroxymethyl)phosphonium sulfate (THPS); (b) water; and (c) methanol; wherein the weight percentages of (a), (b) and (c) are within the area on a ternary phase diagram for (a), (b) and (c) bounded by four points: (A) 5% THPS/58% water/37% methanol; (B) 5% THPS/36% water/59% methanol; (C) 65% THPS/27% water/8% methanol; and (D) 65% THPS/29% water/6% methanol.