Thermo-shrinkable polyester type film and tube and processing method for preparing the tube

Claim 2

A thermo-shrinkable polyester type film having the following shrinking properties: a shrinking ratio in the one axis is not less than 30 % at 80 °C and not less than 50 % at 100 °C, and a shrinking ratio in perpendicular axis to the former axis shows the minimum value at a temperature range of 80 1 25°C.

Claim 3

A thermo-shrinkable polyester type film according to claim 1, which is obtained from a material selected from the group consisting of a polyester and a polyester copolymer having a glass transition temperature of not less than 35 °C, and the mixture of them with at least one other polymer.

Claim 4

A thermo-shrinkable polyester type film according to claim 1, which has an orientation factor of not more than 100 x 10 -3 .

Claim 5

A thermo-shrinkable polyester type film according to claim 1, which is made of a polyester copolymer or the mixture thereof mainly containing a ester group of a dicarboxylic residue and a glycol residue, and containing one kind of an aromatic dicarboxylic residue in an amount of 30 - 90 mole % based on the total dicarboxylic residue, and has a shrinking ratio in one axis of not less than 30%, a shrinking ratio in a perpendicular axis to the former axis of not more than 15 %, and an orientation factor of not more than 100 x 1 0 -3 .

Claim 6

A thermo-shrinkable polyester type film according to claim 1, which has the maximum thermo-shrink stress at 80 °C of 0.95 - 5 kg/mm 2 , and the maximum thermo-shrink stress at 100 °C of 1.0 - 5 kg/mm2.

Claim 7

A tube of a thermo-shrinkable polyester type film which has a jointed surface being jointed by at least one solvent or swelling agent having a solubility or swelling ability to a polyester and a solubility index of 8.0 - 13.8, and the following shrinking properties: a peripheral shrinking ratio is not less than 30 % at 80 °C and not less than 50 % at 100 °C, and a longitudinal shrinking ratio shows the minimum value at a temperature ratio of 80 ± 25 °C.

Claim 8

A tube of a thermo-shrinkable polyester type film which has a jointed surface being jointed by at least one solvent or swelling agent having a solubility or swelling ability to a polyester and a solubility index of 8.0 - 13.8, and the following shrinking properties: a peripheral shrinking ratio is not less than 30 % at 80 °C and not less than 50 % at 100 °C, and a longitudinal shrinking ratio shows the minimum value at a temperature ratio of 80 ± 25 °C.

Claim 9

A tube of a thermo-shrinkable polyester type film according to claim 6, which is obtained from a material selected from the group consisting of a polyester and a polyester copolymer having a glass transition temperature of not less than 35 °C, and the mixture of them with at least one other polymer, and has an orientation factor of not more than 100 x 10 3 .

Claim 10

A tube of thermo-shrinkable polyester type film according to claim 6, which is made of a polyester copolymer or the mixture thereof mainly containing a ester group composed of a dicarboxylic residue and a glycol residue, and containing one kind of an aromatic dicarboxylic residue in an amount of 30 - 90 mole % based on the total dicarboxylic residue, and has a peripheral shrinking ratio of not less than 30%, a longitudinal shrink ratio to the one axis of not more than 15 %, and an orientation factor of not more than 100 x 1 0 -3.

Claim 11

A tube of thermo-shrinkable polyester type film according to claim 6, wherein the jointed surface is jointed by means of simply superposing one side of the film onto the another surface, applying a tape onto at least one surface of the film to joint the film, or butt-seam wherein resulting sealed portion is bent and adhered onto either surface of the tube.

Claim 12

A tube of thermo-shrinkable polyester type film according to claim 6, wherein the tube is jointed by at least one solvent or swelling agent having solubility parameter of 8.0 - 13.8 selected from the group consisting of aromatic hydrocarbon, halogenated hydrocarbon, halogenated aromatic hydrocarbon, phenols, alcohols, nitrogen compound, ketones, ethers, esters, organic acids, inorganic acids, sulfur derivative and N',N'-dimethyl formamide.

Claim 13

A process for production of a tube from polyester type film which comprises: disposing a polyester type film having shrinking properties wherein a shrinking ratio in one axis is not less than 30 % at 80 °C and not less than 50 % at 100 °C, and a shrinking ratio in a perpendicular axis to the former axis shows the minimum value at a temperature range of 80 ± 25°C, spreading at least one jointed surface of the film with a solvent or a swelling agent having a solubility or swelling ability to a polyester and a solubility parameter of 8.0 - 13.8, and jointing the surfaces to be jointed to give a tubular film before the solvent or swelling agent is dried,

Claim 14

A process for production of a tube from polyester type film which comprises: disposing a polyester type film having shrinking properties wherein a shrinking ratio in one axis is not less than 30 % at 80 °C and not less than 50 % at 100 °C, and a shrinking ratio in a perpendicular axis to the former axis shows the minimum value at a temperature range of 80 ± 25°C, spreading at least one jointed surface of the film with a solvent or a swelling agent having a solubility or swelling ability to a polyester and a solubility parameter of 8.0 - 13.8, and jointing the surfaces to be jointed to give a tubular film before the solvent or swelling agent is dried,

Claim 15

A process according to claim 11, wherein the polyester type film is obtained from a material selected from the group consisting of a polyester and a polyester copolymer having a glass transition temperature of not less than 35 °C, and the mixture of them with at least one other polymer, and has an orientation factor of not more than 100 x 10 3.

Claim 16

A process according to claim 11, wherein the film is jointed by using a solvent or a swelling agent selected from the group consisting of halogenated hydrocarbon and ethers.

Claim 17

A process according to claim 11, wherein the film is jointed at a temperature of not higher than 70 °C.

Claim 18

A process for production of a tube from polyester type film which comprises: disposing a polyester type film having shrinking properties wherein a shrinking ratio in one axis is not less than 30 % at 80 °C and not less than 50 % at 100 °C, and a shrinking ratio in a perpendicular axis to the former axis shows the minimum value at a temperature range of 80 ± 25°C, disposing a adhesive layer on entire or part of at least one surface to be jointed, spreading at least one surface with a solvent or a swelling agent having a solubility or swelling ability to a polyester and a solubility parameter of 8.0 - 13.8, and jointing the surface to be jointed to give a tubular film before the solvent or swelling agent is dried.

Claim 19

A process for production of a tube from polyester type film which comprises: disposing a polyester type film having shrinking properties wherein a shrinking ratio in one axis is not less than 30 % at 80 °C and not less than 50 % at 100 °C, and a shrinking ratio in a perpendicular axis to the former axis shows the minimum value at a temperature range of 80 ± 25°C, disposing a adhesive layer on entire or part of at least one surface to be jointed, spreading at least one surface with a solvent or a swelling agent having a solubility or swelling ability to a polyester and a solubility parameter of 8.0 - 13.8, and jointing the surface to be jointed to give a tubular film before the solvent or swelling agent is dried.

Claim 20

A process according to claim 15, wherein the polyester type film is obtained from a material selected from the group consisting of a polyester and a polyester copolymer having a glass transition temperature of not less than 35 °C, and the mixture of them with at least one other polymer, and has an orientation factor coefficient of surface orientation of not more than 100 x 10 -3 .