Phase difference film and production method for same

A technology of retardation film and manufacturing method, applied in chemical instruments and methods, instruments, polarizing elements, etc., can solve problems such as difficulty in manufacturing retardation film, and achieve the effects of small NZ coefficient, easy manufacture and high visibility
CN108139529AActive Publication Date: 2018-06-08ZEON CORP
13 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ZEON CORP
Publication Date
2018-06-08

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

Provided is a phase difference film that comprises a resin including a crystalline polymer. Further provided is a production method which includes: a bonding step for obtaining a third film by bondinga second film to one or both surfaces of a first film comprising a resin that includes the crystalline polymer, has a glass transition temperature of Tg ( DEG C), and a melting point of Tm ( DEG C),wherein the second film has a shrinkage factor of 5-50% in at least one direction in (Tg+30) DEG C; a shrinking step for heating the third film to Tg DEG C to (Tg+30) DEG C, shrinking in at least onedirection, and shrinking the area thereof 5-50% to obtain a fourth film; and a secondary heating step for heating the fourth film to from (Tg+50) DEG C to (Tm-40) DEG C. The NZ coefficient is less than 1.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to a retardation film and a manufacturing method thereof. Background technique

[0002] In display devices such as liquid crystal display devices, various retardation films are often provided.

[0003] As a method for producing a retardation film, a method of imparting optical anisotropy by stretching an isotropic raw material film is widely used. However, in such a manufacturing method, it is difficult to manufacture a certain type of retardation film. For example, it is difficult to obtain a film having an NZ coefficient of less than 1, such as a three-dimensional retardation film, a negative A-plate, or a positive C-plate, simply by stretching an isotropic film.

[0004] As a method of obtaining a retardation film having a small NZ coefficient value, several methods have been proposed. As one of them, there is known a method including bonding a raw material film and a shrinkable film together to obtain a laminated fi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More