Polarizing film
First Claim
1. A polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant, which is a compound of the formula:
- ##STR198## where Y represents an oxygen atom or a sulfur atom;
X7, X8, X9, X10, X11, X12 represent hydrogen atoms, halogen atom, hydroxyl groups or amino groups that may be substituted by an alkyl group of 1 to 3 carbon atoms;
Q represents an anthraquinone radical that may be substituted by X7, X8, X9, X10, X11 or X12, or a group of the formula;
##STR199## where R1 and R2 represent hydrogen atoms, halogen atoms, methyl groups or methoxy groups, m represents a whole number equal to 1, 2 or 3, and R7 represents --COOH, --COOR4, --CONH2, --CONHR4, --COCR4, --NHCOR4, --N═
N--R4, ##STR200## in which R4 and ring B represent phenyl, biphenyl or naphthalene radicals that may be substituted by R1, R2, --COOH and/or --COOCH3, has a solubility in water, organic solvents and liquid crystals of not greater than 0.05 percent by weight at about 25°
C., and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthlate, melting the resulting blend and forming it into a film.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is a polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant is substantially insoluble in water, organic solvents and liquid crystals and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film. This polarizing film has exceptionally excellent moisture resistance and thermal resistance.
45 Citations
2 Claims
-
1. A polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant, which is a compound of the formula:
- ##STR198## where Y represents an oxygen atom or a sulfur atom;
X7, X8, X9, X10, X11, X12 represent hydrogen atoms, halogen atom, hydroxyl groups or amino groups that may be substituted by an alkyl group of 1 to 3 carbon atoms;
Q represents an anthraquinone radical that may be substituted by X7, X8, X9, X10, X11 or X12, or a group of the formula;
##STR199## where R1 and R2 represent hydrogen atoms, halogen atoms, methyl groups or methoxy groups, m represents a whole number equal to 1, 2 or 3, and R7 represents --COOH, --COOR4, --CONH2, --CONHR4, --COCR4, --NHCOR4, --N═
N--R4, ##STR200## in which R4 and ring B represent phenyl, biphenyl or naphthalene radicals that may be substituted by R1, R2, --COOH and/or --COOCH3, has a solubility in water, organic solvents and liquid crystals of not greater than 0.05 percent by weight at about 25°
C., and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthlate, melting the resulting blend and forming it into a film. - View Dependent Claims (2)
- ##STR198## where Y represents an oxygen atom or a sulfur atom;
Specification
-
- Resources
-
Current AssigneeMitsui Chemicals Incorporated (Mitsui Chemicals)
-
Original AssigneeMitsui Chemicals Incorporated (Mitsui Chemicals)
-
InventorsNakamura, Katsuji, Hosonuma, Shin, Fujio, Junichi, Nishizawa, Tsutomu, Nakatsuka, Masakatsu
-
Primary Examiner(s)TUCKER, PHILIP C
-
Application NumberUS07/725,641Time in Patent Office958 DaysField of Search252/585, 252/299.01, 252/299.1, 252/299.5, 524/89, 359/63, 359/96, 359/490US Class Current252/585CPC Class CodesG02B 5/3033 in the form of a thin sheet...
