EP0267799A2
Expired / Lapsed
EP
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Shrinkable polyester film
Assignee: Mitsubishi Chemical Corp
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Filing: 1987-11-12
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Granted: —
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Expires: 2007-11-12
Abstract
Abstract A shrinkable polyester film for applying to bottles and other articles comprises not less than 50 mol% of ethylene terephthalate units and has a birefringence of from 0.040 to 0.150, a shrinkage of not less than 40% in one of the machine direction and the transverse direction and a shrinkage of not more than 20% in the other of the said directions after 5 min treatment in an air oven at 100°C, and a heat of fusion of not less than 8.37 kJ/kg (2 cal/g).
Inventors
- 👤 Yujiro Fukuda
- 👤 Shigeo B-311 Mitsubishi-Kasei Utsumi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 22:43
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C55/00; B29C55/02; B29C55/04; B29C61/00; B29C61/003; B29C35/00; B29C35/02; B29C35/04; B29C35/049; B29K; B29K2067/00; B29K2105/00; B29K2105/02; B29K2995/00; B29K2995/0037; B29K2995/0049; C08J2367/00; C08J2367/02
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
80 words
A shrinkable polyester film which comprises not less than 50 mol% of ethylene terephthalate units and which has a birefringence of from 0.040 to 0.150, a shrinkage of not less than 40% in one of the machine direction and the transverse direction and a shrinkage of not more than 20% in the other of the said directions after 5 min treatment in an air oven at 100°C, and a heat of fusion of not less than 8.37 kJ/kg (2 cal/g).
Claim 2
Dependent Claim
80 words
A shrinkable polyester film which comprises not less than 50 mol% of ethylene terephthalate units and which has a birefringence of from 0.040 to 0.150, a shrinkage of not less than 40% in one of the machine direction and the transverse direction and a shrinkage of not more than 20% in the other of the said directions after 5 min treatment in an air oven at 100°C, and a heat of fusion of not less than 8.37 kJ/kg (2 cal/g).
Claim 3
Dependent Claim
32 words
A film according to claim 1, wherein the film haze after immersing said film in water at 85°C for 30 min under a tensioned and fixed condition is not more than 20%.
Claim 4
Dependent Claim
43 words
A film according to claim 1 or 2, wherein the unevenness of the thickness of said film in the machine direction and the transverse direction is not more than 30% and the static friction coefficient of said film is not more than 1.2.
Claim 5
Dependent Claim
32 words
A film according to any one of the preceding claims wherein the shrinking stress of said film in the main shrinking direction is not less than 100 g/mm² in air of 100°C.
Claim 6
Dependent Claim
28 words
A film according to any one of the preceding claims, wherein the breaking strength of said film in the main shrinking direction is not less than 20 kg/mm².
Claim 7
Dependent Claim
37 words
A film according to any one of the preceding claims, wherein the diol component of said film comprises from 50 to 97 mol% of ethylene glycol units and from 50 to 3 mol% of neopentyl glycol units.
Claim 8
Dependent Claim
27 words
A film according to any one of the preceding claims, wherein the glass transition temperature of the polyester which constitutes said film is not lower than 65°C.
Claim 9
Dependent Claim
35 words
A film according to any one of the preceding claims, wherein the dicarboxylic acid component of said film comprises terephthalic acid units and isophthalic acid units in a molar ratio of from 50:50 to 95:5.
Claim 10
Dependent Claim
52 words
A film according to any one of the preceding claims, wherein the shrinkage of said film after 30 sec treatment in water of 85°C is not less than 60% in one of the machine direction and the transverse direction and is not more than 15% in the other of the said directions.
Claim 11
Dependent Claim
40 words
A film according to any one of the preceding claims, wherein the shrinkage of said film after 2 weeks treatment in an air oven at 40°C is not more than 3% in both the machine direction and the transverse direction.
Claim 12
Dependent Claim
62 words
A shrinkable polyester film which comprises not less than 50% of ethylene terephthalate units and which has a shrinkage of not less than 30% in one of the machine direction and the transverse direction and a specific (maximum) shrinkage (the neck-in rate) of not more than 20% in the other of the said directions after 5 sec treatment in water at 75°C.
Claim 13
Dependent Claim
62 words
A shrinkable polyester film which comprises not less than 50% of ethylene terephthalate units and which has a shrinkage of not less than 30% in one of the machine direction and the transverse direction and a specific (maximum) shrinkage (the neck-in rate) of not more than 20% in the other of the said directions after 5 sec treatment in water at 75°C.
Claim 14
Dependent Claim
17 words
A film according to claim 11, wherein the birefringence of said film is not less than 0.050.
Claim 15
Dependent Claim
73 words
A shrinkable polyester film which comprises not less than 50% of ethylene terephthalate units and which has a shrinkage of not less than 20% in one of the machine direction and the transverse direction after 5 min treatment in an air oven at 100°C, an elongation at break of from 1 to 100% in the other of the said directions and a heat of fusion of not more than 33.5 kJ/kg (8 cal/g).
Claim 16
Dependent Claim
73 words
A shrinkable polyester film which comprises not less than 50% of ethylene terephthalate units and which has a shrinkage of not less than 20% in one of the machine direction and the transverse direction after 5 min treatment in an air oven at 100°C, an elongation at break of from 1 to 100% in the other of the said directions and a heat of fusion of not more than 33.5 kJ/kg (8 cal/g).
Claim 17
Dependent Claim
44 words
A film according to claim 13, wherein the shrinkage of said film after 2 weeks treatment in an air oven at 40°C is not more than 3% in the main shrinking direction and the transverse direction, and the birefringence is. from 0.040 to 0.120.
Claim 18
Dependent Claim
54 words
A film according to claim 13 or 14, wherein the specific (maximum) shrinkage (the neck-in rate) of said film after 5 sec treatment in water at 75°C is not more than 10% in the direction perpendicular to the main shrinking direction and the breaking strength of said film is not less than 3 kg/mm².
Claim 19
Dependent Claim
24 words
A film according to any one of claims 13 to 15, wherein the mean surface roughness of said film is 0.005 to 0.1 um.
Claim 20
Independent Claim
33 words
A method of applying a film to a bottle or other article, which method comprises shrinking a film as claimed in any one of the preceding claims onto the bottle or other article.
References Cited (Backward Citations)
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