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. 21, 1989
Filed:
Jul. 15, 1987
Shigeo Utsumi, Yokohama, JP;
Yujiro Fukuda, Machida, JP;
Diafoil Company, Limited, Tokyo, JP;
Abstract
A shrinkable film for packaging excellent in the heat-sealing property and the shrinking property is disclosed. This shrinkable film is obtained by stretching a film of a mixture comprising 100 to 30 weight parts of a crystalline polyester (A), which comprises mainly terephthalic acid and 1,4-cyclohexane dimethanol and has a heat of crystalline melting of not less than 3 cal/g and a melting point in the range of 200.degree. to 310.degree. C., and 0 to 70 weight parts of a polyester (B) comprising terephthalic acid and/or 2,6-naphthalene dicarboxylic acid as the dicarboxylic acid constitutional unit and ethylene glycol and/or 1,4-butylene glycol as the glycol constitutional unit. The mixture of the polyester (A) and polyester (B) has a good handling property in drying. The shrinkable film for packaging of the present invention can be produced without any difficulty in drying and shows the ratio of shrinkage of 40 to 90% after 5-minute heat treatment at 100.degree. C. in either of the longitudinal and transverse directions, the ratio of shrinkage or expansion of not more than 15% after 5-minute heat treatment at 100.degree. C. in the other direction and the haze of not more than 10% at a film thickness of 35 .mu.m.