Title:
SURFACE PROTECTIVE FILM
Document Type and Number:
WIPO Patent Application WO/2022/138113
Kind Code:
A1
Abstract:
Provided is a surface protective film capable of increasing the film thickness of an adhesive layer, demonstrating easy peelability, and realizing low haze. Also provided is an optical member and an electronic member having such surface protective film attached thereto. A surface protective film according to an embodiment of the present invention includes a urethane adhesive layer. The urethane adhesive layer is composed of a urethane adhesive formed of a urethane adhesive composition. The urethane adhesive composition includes a urethane prepolymer P, a polyol A, and a multifunctional isocyanate compound B. The weight ratio between P and A is P/A = (50 to 99)/(1 to 50). The polyol A includes a first polyol A1 having a number average molecular weight Mn of 5,000 to 20,000, and a second polyol A2 having a number average molecular weight Mn of 300 to 4,999. The weight ratio between A1 and A2 satisfies 1.0 ≤ (A1/A2) ≤ 3.5.
Inventors:
SASAKI SHOGO (JP)
YAMAMOTO YUSUKE (JP)
YAMAMOTO YUSUKE (JP)
Application Number:
PCT/JP2021/044740
Publication Date:
June 30, 2022
Filing Date:
December 06, 2021
Export Citation:
Assignee:
NITTO DENKO CORP (JP)
International Classes:
B32B27/00; B32B27/40; C08G18/40; C08K5/02; C08L75/04; C08L81/04; C09J7/38; C09J11/06; C09J175/04
Foreign References:
| JP2016176068A | 2016-10-06 | |||
| JP2016108442A | 2016-06-20 | |||
| JP2017160422A | 2017-09-14 | |||
| JP2016017109A | 2016-02-01 | |||
| JP2014111701A | 2014-06-19 | |||
| JP2018062595A | 2018-04-19 |
Attorney, Agent or Firm:
MOMII Takafumi (JP)
Download PDF:
Previous Patent: AUTHENTICATION SYSTEM, COMPUTER PROGRAM, ELECTRIC DEVICE, AND MOBILE TERMINAL
Next Patent: SURFACE PROTECTION FILM
Next Patent: SURFACE PROTECTION FILM