Westvaco Corporation

David V Braddon

Frank J Ball

Lynden J Stryker

Peter Schilling

Sten I Falkehag

An anti-corrosive composition is disclosed which comprises the condensate of a polyamine such as diethylenetriamine, triethylenetetramine or aminoethylethanol amine with a 21 or 22 carbon fatty polycarboxylic acid or acid anhydride. The composition may additionally include the condensation products of the above polyamines with either tall oil fatty acids or Rosin S. Propargyl alcohol has been found to enhance the anti-corrosive effects of the composition. The compositions are especially useful in well drilling operations where a strong inorganic acid is used to facilitate crude oil flow.

Corrosion inhibitors

Disclosed herein are low porosity aggregate-containing cement compositions comprising hydraulic cement containing substantially no calcium sulfate at least 0.1% alkali bicarbonate by weight based on dry ground cement, and at least 0.1% of a lignosulfonate or sulfonated lignin by weight based on dry ground cement, said aggregate-containing cement composition having been made at a water-to-cement ratio of between 0.4 and 0.15. Also, disclosed are methods for producing these low porosity aggregate-containing cements.

Low porosity aggregate-containing cement composition and process for

A method is disclosed for making low-porosity, free-flowing cement pastes with extended set times, improved workability and reduced expansion due to alkali aggregate reactions by combining hydraulic cements, especially portland-type cements, ground without gypsum with from 0.1 to about 1.0% of an alkali or alkaline earth lignosulfonate or sulfonated lignin, and 0.1 to 2.0% of an alkali bicarbonate, and combining with 20 to 40% water. Mixtures of aggregates with such low-porosity pastes made according to this process produce very workable mortars and concretes with extended set times and upon hardening have reduced expansion.

Low porosity cement and process for producing same

Stabilizing compositions comprising at least one triaryl phosphite, trialkyl phosphite or mixtures thereof and at least one modified lignin, the weight ratio of the phosphite to modified lignin is from 97/3 to 10/90. The modified lignins are produced by heat treating lignins in the presence of a nucleophile, such that a portion of the original guaiacyl structures are converted to catechols via a demethylation reaction. Elastomers may be protected against atmospheric degradation by the addition thereto of 0.01 to 5.0 parts by weight, preferably 0.25 to 2.0 parts, per 100 parts of elastomer of the stabilizing composition.

Growing community of inventors

Charleston Heights, SC, United States of America

David V Braddon