The present disclosure provides a polyetheramine alkoxylate compound containing aromatic groups in the hydrophobe allowing the compound to exhibit unique functionality, high performance and low cost, but without the toxicity and/or skin and eye irritation problems associated with conventional polyetheramine compounds.

Disclosed are a pH-responsive amphoteric surfactant N-lauryl-(-alkyl)--aminopropionic acid and a preparation method and uses thereof. An alkylamine and a solvent are added to a three-necked flask, stirred for complete dissolution, slowly dropwise added with methyl -alkyl-acrylate and reacted at room temperature after the ice-water bath is removed. The reaction mixture is refluxed in water bath and evaporated under rotation to remove the solvent and the residual methyl -alkyl-acrylate to give N-lauryl-(-alkyl)--aminopropionic acid. Then N-lauryl-(-alkyl)--aminopropionic acid and water are added to a three-necked flask, slowly dropwise added with a sodium hydroxide solution and reacted in water bath to give a crude product, which is filtered and dried to give a purified surfactant sodium N-lauryl-(-alkyl)--aminopropionate. This surfactant is suitable for the foamed acid system and its performance can be switched by adjusting pH due to pH sensitivity.

Disclosed are a pH-responsive amphoteric surfactant N-lauryl-(-alkyl)--aminopropionic acid and a preparation method and uses thereof. An alkylamine and a solvent are added to a three-necked flask, stirred for complete dissolution, slowly dropwise added with methyl -alkyl-acrylate and reacted at room temperature after the ice-water bath is removed. The reaction mixture is refluxed in water bath and evaporated under rotation to remove the solvent and the residual methyl -alkyl-acrylate to give N-lauryl-(-alkyl)--aminopropionic acid. Then N-lauryl-(-alkyl)--aminopropionic acid and water are added to a three-necked flask, slowly dropwise added with a sodium hydroxide solution and reacted in water bath to give a crude product, which is filtered and dried to give a purified surfactant sodium N-lauryl-(-alkyl)--aminopropionate. This surfactant is suitable for the foamed acid system and its performance can be switched by adjusting pH due to pH sensitivity.

The invention relates to a method for preparing 6-aminocaproic acid (hereinafter also referred to as 6-ACA) using a biocatalyst. The invention further relates to a method for preparing -caprolactam (hereafter referred to as caprolactam) by cyclising such 6-ACA. The invention further relates to a host cell, a micro-organism, or a polynucleotide which may be used in the preparation of 6-ACA or caprolactam.

The invention relates to a method for preparing 6-aminocaproic acid (hereinafter also referred to as 6-ACA) using a biocatalyst. The invention further relates to a method for preparing -caprolactam (hereafter referred to as caprolactam) by cyclising such 6-ACA. The invention further relates to a host cell, a micro-organism, or a polynucleotide which may be used in the preparation of 6-ACA or caprolactam.

The invention relates to a method for preparing 6-aminocaproic acid (hereinafter also referred to as 6-ACA) using a biocatalyst. The invention further relates to a method for preparing -caprolactam (hereafter referred to as caprolactam) by cyclising such 6-ACA. The invention further relates to a host cell, a micro-organism, or a polynucleotide which may be used in the preparation of 6-ACA or caprolactam.

Methods of preparing a polyaspartic ester composition comprise reacting a primary diamine reactant composition with a diester reactant composition under conditions to prepare a polyaspartic ester composition having a primary amine value of less than 35 mg KOH/g wherein, at the time of the reaction, the combined water content of the primary diamine reactant composition and the diester reactant composition is less than 300 ppm. Compositions and methods of use of the compositions are also described.

Methods of preparing a polyaspartic ester composition comprise reacting a primary diamine reactant composition with a diester reactant composition under conditions to prepare a polyaspartic ester composition having a primary amine value of less than 35 mg KOH/g wherein, at the time of the reaction, the combined water content of the primary diamine reactant composition and the diester reactant composition is less than 300 ppm. Compositions and methods of use of the compositions are also described.

The present invention relates to a method for purifying polyaspartic acid ester compositions and to the provision of polyaspartic acid ester compositions that contain 0.01 to <2% by weight fumaric acid dialkyl esters.

The present invention relates to polyaspartic acid ester compositions which contain polyaspartic acid esters with primary amino groups and small amounts of fumaric acid dialkyl esters, to a method for preparing same and the use thereof as a reactive component for polyisocyanates in two-component polyurethane systems.