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:
Jun. 27, 1989
Filed:
Feb. 17, 1987
Chan I Chung, Schenectady, NY (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
The present invention relates to compositions and methods for reducing the melt viscosity of vinylidene chloride containing polymers having a majority of polymerized vinylidene chloride. The methods involve introducing a solid solvent into a vinylidene chloride containing polymer. The solid solvent is compatible with vinylidene chloride containing polymers at a processing temperature above the solid solvent melting point and will reduce the melt viscosity and improve processing of the vinylidene chloride containing polymer. Upon cooling below the solid solvent melting point the solid solvent will beocme microdispersed in the vinylidene chloride containing polymer with little or no solid solvent remaining dissolved in the vinylidene chloride containing polymer. One such solid solvent is dimethyl sulfone. The solid solvents are introduced into the vinylidene chloride containing polymer directly, or indirectly through the use of a polymer or additive containing the solid solvent which is blended into the vinylidene chloride containing polymer.