The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 06, 1990
Filed:
Mar. 15, 1989
Craig J Carriere, Midland, MI (US);
David H Bank, Lake Jackson, TX (US);
Christopher P Christenson, Lake Jackson, TX (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
A foam pulse rheometer measures the total integrated stress response of a foaming polymer to a short duration strain pulse applied to the polymer, from which can be calculated the equilibrium modulus and the zero shear viscosity of the foaming polymer during the foaming reaction. A shear plate mounted to a load cell above a jacket extends downwardly into a foaming polymer within the jacket. Under the application of a vertical square wave strain pulse to the jacket, the load cell senses the shear force exerted upon the shear plate by the foaming polymer. Simultaneously, a video camera and recorder monitors the surface area of the plate acted upon by the jacket. For each pulse, simultaneously occurring discrete sensed force values and discrete monitored surface area values can be used to compute the total integrated stress response, from which can be calculated the equilibrium modulus and the zero shear viscosity. By applying successive strain pulses during the foaming process, until the polymer tears away from the plate, the evolution of the equilibrium modulus can be studied throughout the course of the foaming reaction.