Patent · US Active

Release film

US11373881B2 · kind B2 · utility

0Cited by

0References

14Claims

0Family size

Assignee

TORAY INDUSTRIES, INC. · JP

Inventors

Hideo Shoji · Tokyo, JP
Teruya Tanaka · Pekan Nanas, MY
Isao Manabe · Tokushima, JP

Key dates

Filing date	Dec 13, 2018
Grant date	Jun 28, 2022
Priority date	—
Expiry date	Aug 22, 2039

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2367/00
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A release film satisfies formulas (I) and (II) when S1 (%) represents the maximum dimensional change rate between 30° C. and 150° C. when the temperature is raised from 30° C. to 200° C. at a rate of 10° C./min, T1 (° C.) represents the temperature at which S1 is obtained, and S0 (%) represents the dimensional change rate at 40° C. The surfaces may have a surface free energy Sa (mN/mm) at 25° C., surface free energy Sb (mN/mm) after having been subjected to a heat treatment at 180° C. for 3 minutes, and surface free energy Sc (mN/mm) after having been stretched by 50% at 180° C. that satisfy formulas (III) and (IV). 0≤S1≤1.5 Formula (I):0≤|S1−S0|/(T1−40)≤0.050 Formula (II):0≤|Sa−Sb|≤15 Formula (III):0≤|Sa−Sc|≤15 Formula (IV):

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.