Low corrosion release agent for ligno-cellulosic composites

An external release agent less corrosive than Reverse Osmosis purified water for ligno-cellulosic composite panels comprising two or more anionic surfactants selected from the following groups,

• a) an ethoxylated phosphate ester or a salt thereof having the formula wherein,
• R, R1 and R2 are independently selected from the group consisting of H, and C6-C30 alkyl chain having an average of 1-20 moles of ethoxylation with the proviso that at least one of R, R1 and R2is H and the other one or two of R, R1 and R2 is C6-C30 alkyl chain having an average of 1-20 moles of ethoxylation;
• b) a phosphate ester or a salt thereof having the formula wherein,
• R3 R4 and R5 are independently selected from the group consisting of H, and C6-C18 alkyl chain,
• with the proviso that at least one of R3, R4 and R5 is H and the other one or two of R3, R4 and R5 is C6-C18 alkyl chain, and
• c) an organic sulfur containing anionic surfactant or a salt thereof, wherein:
• at least one of the anionic surfactants is selected from a) and at least one of the anionic surfactants is selected from b);
• the at least one anionic surfactant selected from a) is present at a concentration of 2 - 45% by weight;
• the at least one anionic surfactant from b) is present at a concentration of 2-45% by weight;
• and
• the release agent further comprises 10-96% by weight water and optionally an agent to adjust the pH of the composition.