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:
May. 02, 1995
Filed:
Apr. 30, 1993
Martin H Tusim, Newark, OH (US);
Chung P Park, Pickerington, OH (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
Disclosed is an extruded, unitary, closed-cell olefin polymer foam structure in plank form. The foam structure has a cross-section of 2 or more inches in one dimension and 18 or more inches in the other dimension. The olefin polymer material has a melt index of about 3.5 grams/10 minutes or less. The foam structure contains a blowing agent of about 75 mole percent or more 1,1-difluoroethane based upon the total moles of blowing agent. Further disclosed is a process for making the foam structure at a shear rate of about 400/second or more. It was found surprising that 1,1-difluoroethane which has relatively low solubility in olefin polymers, could be used to make olefin polymer foam structures of large cross-section.