Dunlop Rubber Company

The contouring of the calender rolls by grinding in order to counteract the natural deflection and the deflection set up by the work being done with rubber stock load is a precision job and in most cases it is done by trial and error method. The nip pressure per inch width of the roll for most rubber compounds has been extensively studied by scientists in the Dunlop Rubber Company [ref Paper "Estimation of the shear deformation exerted by a roll-mill upon a rubber compound" by T.S. Ng, G. Angerer, Dunlop Forschung, Dunlop-Strasse 2, Hanau, Federal Republic of Germany, Presented at the Jahrestagung der... 

Deutschen Rheologischen Gesellschaft with Conference Chemical Engineering Rheology in Aachen, 5-7 March 1979, ref Polymer Engineering and Science, Volume 20, Issue 8, Pages 585 - 588, 1980 Society of Plastics Engineers, Inc]. As per sources in Dunlop Rubber Company the nip pressure is of the order of 1500 lb per inch width of the roll for most rubber compounds. 

Company (later known as Dunlop Rubber Company) Used by William Stewart Halsted NR gloves (made by Goodyear... 

Jaeger and Korb" described the use of added carboxyl nitrile rubber to modify a standard rubber-to-metal adhesive containing chlorinated rubber and phenolic resin and thereby enhance the rubber-to-metal bonding capability. Cylinders of natural rubber were bonded by vulcanization for 25 min at 145°C and 70 kg/cm. The bond strength for the control adhesive was 59 kg as compared to 74 kg for the modified adhesive. This adhesive was also used successfully for bonding cw-polybutadiene rubber and nitrile rubbers to steel, aluminum, and brass adherends. The Dunlop Rubber Company patent claims the use of a butadiene... 

Hoechst Corporation, Ashland Chemical Company, Cabot Corporation, Dow Chemical U.S.A., Dunlop Research Centre, E. I. du Pont de Nemours Company, The Firestone Tire Rubber Company, The General Tire Rubber Company, The BF Goodrich Company, The Goodyear Tire Rubber Company, Monsanto Company, Polysar Limited, Shell Development Company, 3M Chemicals Division, and Uniroyal Chemical Division. 

Dispersions of copolymers of butadiene with acrylic acid or methacrylic acid in aqueous potassium hydroxide have been mentioned in the patent literature" as a dip for adhering rayon tire cord to rubber. The effect is most evident when carboxyl groups are present in the adhesive, the tie cement, and the cover stocks. The adhesive may be applied as latex, aqueous dispersion, or cement. A patent issued to the Dunlop Company Ltd." describes the use of a styrene-butadiene-itaconic acid copolymer with Gen-Tac Latex (GenCorp) in formulating an RFL (resorcinol formaldehyde latex) type adhesive for bonding a natural rubber compound to Nylon 66 and rayon tire cords. Brodnyan" also claims carboxylic adhesives for rayon, nylon, and Dacron cords. In this case, the tire cords were treated with a mixed polymer latex containing resorcinol-formaldehyde condensate, a butadiene-vinyl pyridine copolymer, an SBR copolymer, and a multifunctional copolymer from methyl acrylate, 2-hydroxy propyl methacrylate, and acrylic acid. A different approach was reported by Badenkov" whereby rayon or nylon tire cords were coated with... 

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