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. 30, 2010
Filed:
May. 11, 2007
Michael E. Broadus, Mauldin, SC (US);
Richard M. Dayrit, Simpsonville, SC (US);
Brian P. Rivers, Simpsonville, SC (US);
Roger D. Vrooman, Greer, SC (US);
Marvin R. Havens, Greer, SC (US);
Emmet Austin, Greer, SC (US);
Frank M. Hofmeister, Simpsonville, SC (US);
Matthew D. Dawe, Simpsonville, SC (US);
Nathanael R. Miranda, Spartanburg, SC (US);
Christopher K. Robinson, Moore, SC (US);
Bryan E. Freeman, Enoree, SC (US);
Josh E. Johnston, Louisville, KY (US);
Michael E. Broadus, Mauldin, SC (US);
Richard M. Dayrit, Simpsonville, SC (US);
Brian P. Rivers, Simpsonville, SC (US);
Roger D. Vrooman, Greer, SC (US);
Marvin R. Havens, Greer, SC (US);
Emmet Austin, Greer, SC (US);
Frank M. Hofmeister, Simpsonville, SC (US);
Matthew D. Dawe, Simpsonville, SC (US);
Nathanael R. Miranda, Spartanburg, SC (US);
Christopher K. Robinson, Moore, SC (US);
Bryan E. Freeman, Enoree, SC (US);
Josh E. Johnston, Louisville, KY (US);
Cryovac, Inc., Duncan, SC (US);
Abstract
A multilayer, heat-shrinkable film contains at least one semi-crystalline polyamide selected from the group consisting of polyamide 6, polyamide 66, polyamide 6/66, and polyamide 6/12. The film may have a total semi-crystalline polyamide content of at least 35 volume percent, based on total film volume, and a total free shrink at 185° F. of at least 35 percent. The film may have an FTIR Transmission Absorbance A/Aratio of up to 1.65. The film may be a retortable film, capable of being used in a process for preparing a retorted packaged product. A process for making a heat-shrinkable annular film containing the semi-crystalline polyamide comprises extruding an annular extrudate downward from an annular die, quenching the annular extrudate by applying a quenching liquid to the annular extrudate, reheating the extrudate to an orientation temperature, and orienting the reheated annular extrudate while the reheated annular extrudate is in the solid state, the orientation being carried out with a total orientation factor of at least 2, to produce a film having a total free shrink at 185° F. of at least 10 percent.