公开(公告)号：US20230257539A1

公开(公告)日：2023-08-17

申请号：US18308997

申请日：2023-04-28

Applicant: UNITIKA LTD.

Inventor： Akiko Kurosawa ,  Atsuko Noda

IPC: C08J5/18 ,  B32B27/34 ,  C08J11/10 ,  C08L77/02

CPC classification number: C08J5/18 ,  B32B27/34 ,  C08J11/10 ,  C08L77/02 ,  B32B2307/518 ,  B32B2439/00 ,  C08L2207/20

Abstract: [Problem] To provide a method for producing a polyamide resin film by using a poi amide resin obtained through polymerization of a regenerated monomer used as a recycled material. [Solution] Provided is a method for producing a polyamide resin film, including: a step of producing a monomer from a raw material (A) for depolymerization, (2) a step of producing a polyamide resin (B) through polymerization using a raw material containing the monomer, (3) a step of refining the polyamide resin (B), and (4) a step of producing an unstretched film using a starting material containing the refined polyamide resin (B), and stretching the unstretched film.

公开(公告)号：US20230054022A1

公开(公告)日：2023-02-23

申请号：US17794030

申请日：2021-01-22

Applicant: UNITIKA LTD.

Inventor： Akiko Kurosawa ,  Atsuko Noda

IPC: C08J5/18 ,  C08J11/10 ,  C08L77/02 ,  B32B27/34

Abstract: To provide a method for producing a polyamide resin film by using a polyamide resin obtained through polymerization of a regenerated monomer used as a recycled material. Provided is a method for producing a polyamide resin film, including: (1) a step of producing a monomer from a raw material (A) for depolymerization, (2) a step of producing a polyamide resin (B) through polymerization using a raw material containing the monomer. (3) a step of refining the polyamide resin (B), and (4) a step of producing an unstretched film using a starting material containing the refined polyamide resin (B), and stretching the unstretched film.

公开(公告)号：US12012491B2

公开(公告)日：2024-06-18

申请号：US17794030

申请日：2021-01-22

Applicant: UNITIKA LTD.

Inventor： Akiko Kurosawa ,  Atsuko Noda

IPC: C08J5/18 ,  B32B27/34 ,  C08J11/10 ,  C08L77/02

CPC classification number: C08J5/18 ,  B32B27/34 ,  C08J11/10 ,  C08L77/02 ,  B32B2272/00 ,  B32B2305/70 ,  B32B2307/518 ,  B32B2307/704 ,  B32B2307/75 ,  B32B2439/00 ,  C08L2207/20

Abstract: To provide a method for producing a polyamide resin film by using a polyamide resin obtained through polymerization of a regenerated monomer used as a recycled material. Provided is a method for producing a polyamide resin film, including: (1) a step of producing a monomer from a raw material (A) for depolymerization, (2) a step of producing a polyamide resin (B) through polymerization using a raw material containing the monomer. (3) a step of refining the polyamide resin (B), and (4) a step of producing an unstretched film using a starting material containing the refined polyamide resin (B), and stretching the unstretched film.

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.