公开(公告)号：US20230113079A1

公开(公告)日：2023-04-13

申请号：US17915219

申请日：2021-03-26

Applicant: UNITIKA LTD. ,  NIPPON ESTER CO., LTD. ,  UNITIKA TRADING CO., LTD.

Inventor： Goro Araki ,  Hiroshi Ashihara ,  Hazumu Nagano

IPC: C08G63/183

Abstract: To provide a biaxially stretched polyester resin film that has excellent properties equal to or better than those of biaxially stretched polyester film that does not use recycled raw material, and in particular that has an excellent flexural resistance in low-temperature environments. A biaxially stretched polyester resin film that characteristically satisfies both of the following properties (1) and (2): (1) in differential scanning calorimetry (DSC), after heating from 25° C. to 300° C. at a heating rate of 20° C./minute and holding for 10 minutes at 300° C., the temperature of crystallization during cooling at a cooling rate of 40° C./minute is 160° C. to 180° C.; and (2) the number of pinholes after the execution of 200 repetitive cycles of a flexural fatigue test in a −10° C. atmosphere using a Gelbo Flex Tester is not more than 10/500 cm2.

公开(公告)号：US20250108589A1

公开(公告)日：2025-04-03

申请号：US18726197

申请日：2023-03-25

Applicant: UNITIKA LTD.

Inventor： Hiroshi Ashihara ,  Goro Araki ,  Atsushi Maehara

IPC: B32B27/20 ,  B32B27/34 ,  B32B27/36

Abstract: A gas barrier laminate with a total thickness of 100 μm or less, including a plastic base material (I) and a gas barrier layer (II) laminated on said plastic base material, wherein (1) plastic base material (I) includes a metal-containing layer including at least one metal and a metal compound and a resin component, (2) the total content of metal and metal compound in said metal-containing layer is 0.1 to 70% by mass, (3) gas barrier layer (II) contains polycarboxylic acid, (4) metal-containing layer and gas barrier layer are laminated so that they are in direct contact with each other, and (5) gas barrier laminate is treated at a temperature of 95° C. for 30 minutes. (5) the gas barrier laminate has an oxygen transmission rate of 300 ml/(m2·day·MPa) or less under a temperature of 40° C. and a humidity of 90% RH after hot water treatment for 30 minutes at 95° C.

公开(公告)号：US20240018316A1

公开(公告)日：2024-01-18

申请号：US17619613

申请日：2021-03-08

Applicant: UNITIKA LTD.

Inventor： Hiroshi Ashihara ,  Takayoshi Okuzu ,  Ken Akamatsu ,  Akiko Kurosawa ,  Goro Araki ,  Akito Kajita

IPC: C08J5/18 ,  C08G63/183 ,  B29C48/00 ,  B29C48/08

CPC classification number: C08J5/18 ,  C08G63/183 ,  B29C48/022 ,  B29C48/08 ,  B29C48/0018 ,  B29K2067/003

Abstract: A polyester film includes a polyester (A) composed mainly of polybutylene terephthalate and a polyester (B) composed mainly of polyethylene terephthalate,



wherein a mass ratio (A/B) between the polyesters (A) and (B) is 70/30 to 55/45, a dry heat shrinkage rate (B) through heat treatment at 200° C. for 15 minutes is 35% or less in any of four directions (0°, 45° 90° and 135°) on the film surface, a difference between a maximum value and a minimum value of these dry heat shrinkage rates is 5% or less, a thickness variation in the four directions is 10% or less, and a crystallization index shown in DSC measurement is 25 to 55 J/g.