Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1987-07-15
1989-03-21
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528302, 528305, 5283081, 5283086, 2641761, C08G 6302
Patent
active
048144266
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.
REFERENCES:
patent: 4096126 (1978-06-01), Tanaka et al.
patent: 4362775 (1982-12-01), Yabe et al.
Fukuda Yujiro
Utsumi Shigeo
Acquah S. A.
Diafoil Company Limited
Foelak Morton
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