Laminated light-polarizing sheet

• US 4,230,768 A
• Filed: 03/29/1979
• Issued: 10/28/1980
• Est. Priority Date: 03/29/1979
• Status: Expired due to Term

• Current Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Inventors: Suzuki, Hajime, Ichikawa, Rinjiro, Hamada, Hiroyuki
• Primary Examiner(s): Robinson, Ellis P.
• Application Number:
  US06/025,234
• Time in Patent Office: 579 Days
• Field of Search: 428/1, 428/412, 428/414, 428/442, 428/424, 428/518, 428/510, 428/520, 428/913, 428/352, 428/354, 428/519, 428/463, 428/415, 428/212, 428/483, 428/344, 428/476.1, 428/910, 525/192, 525/203, 525/206, 525/213, 525/227, 350/149, 350/155
• US Class Current: 428/352
• CPC Class Codes: B32B 2307/42 Polarizing, birefringent, filtering
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/308 comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/322 comprising halogenated polyolefins, e.g. PTFE
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: G02B 5/3033 in the form of a thin sheet or foil, e.g. Polaroid
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10T 428/2804 Next to metal
• CPC Class Codes: Y10T 428/2839 with release or antistick coating
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31515 As intermediate layer
• CPC Class Codes: Y10T 428/31518 Next to glass or quartz
• CPC Class Codes: Y10T 428/31565 Next to polyester [polyethylene terephthalate, etc.]
• CPC Class Codes: Y10T 428/31573 Next to addition polymer of ethylenically unsaturated monomer
• CPC Class Codes: Y10T 428/31649 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31746 Polymer of monoethylenically unsaturated hydrocarbon
• CPC Class Codes: Y10T 428/31797 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31891 Where addition polymer is an ester or halide
• CPC Class Codes: Y10T 428/3192 : Next to vinyl or vinylidene chloride polymer
• CPC Class Codes: Y10T 428/31924 : Including polyene monomers
• CPC Class Codes: Y10T 428/31928 : Ester, halide or nitrile of addition polymer

Abstract

A laminated light-polarizing sheet having an excellent humidity resistance with dimensional stability under a high humidity as well as an excellent light resistance comprising a light-polarizing film of a halogenated vinyl or vinylidene polymer containing polyene chains formed by partial dehydrohalogenation and a film or sheet of an acrylate or methacrylate polymer laminated on at least one surface of the light-polarizing film.

Claims

1. A laminated light-polarizing sheet comprising a light-polarizing film of a halogenated vinyl or vinylidene polymer containing polyene chains formed by partial dehydrohalogenation, said chains being oriented by stretching, and a film or sheet of an acrylate of methacrylate polymer laminated on at least one surface of the light-polarizing film.

2. A laminated light-polarizing sheet according to claim 1, wherein the film or sheet is laminated on the surface of the light-polarizing film with an adhesive.

3. A laminated light-polarizing sheet according to claim 1, wherein the film or sheet is directly laminated on the surface of the light-polarizing film.

4. A laminated light-polarizing sheet according to claim 1, wherein said sheet has a light transmittance of not less than 60% within the wavelength range of 500 to 800 mμ

and of not more than 10% within the wavelength range of 230 to 420 mμ

.

5. A laminated light-polarizing sheet according to claim 1, wherein a pressure sensitive adhesive layer covered by a release film is further provided on at least one surface of the laminated light-polarizing sheet.

6. A laminated light-polarizing sheet according to claim 1, wherein a reflex plate is further laminated on either surface of the laminated light-polarizing sheet.

7. A laminated light-polarizing sheet according to claim 6, wherein a pressure sensitive adhesive layer covered by a release film is further provided on at least one surface of the laminated light-polarizing sheet.

8. A laminated light-polarizing sheet according to claim 1, wherein the film or sheet is that of a homopolymer or a copolymer of a monomer of the formula:

##STR5## in which R is hydrogen or an alkyl group having 1 to 10 carbon atoms; and

R₉ is an alkyl group, a halosubstituted alkyl group or an alkyl group whose chain is interrupted with O, N, or S, each alkyl group having 1 to 10 carbon atoms, a cycloalkyl or bicycloalkyl group having 5 to 10 carbon atoms, an aryl group or halosubstituted aryl group having 6 to 10 carbon atoms, an aralkyl group having 7 to 10 carbon atoms or a heterocyclic group containing one or more hetero atom selected from O, N and S.

9. A laminated light-polarizing sheet according to claim 1, wherein the film or sheet is that of a copolymer of the monomer of the formula:

##STR6## in which R₈ is hydrogen or an alkyl having 1 to 10 carbon atoms; and

R₉ is an alkyl group, a halosubstituted alkyl group or an alkyl group whose chain is interrupted with O, N, or S, each alkyl group having 1 to 10 carbon atoms, a cycloalkyl or bicycloalkyl group having 5 to 10 carbon atoms, an aryl group or halosubstituted aryl group having 6 to 10 carbon atoms, an aralkyl group having 7 to 10 carbon atoms or a heterocyclic group containing one or more hetero atom selected from O, N and S;

said copolymer containing up to 50 mol % (based on all the structural units of the polymer) of another copolymerized copolymerizable monomer of the formula;

##STR7## in which R₁₀ is hydrogen or an alkyl group having 1 to 10 carbon atoms; and

R₁₁ is an unsubstituted, hydroxyl substituted or halogen substituted alkyl group or alkyl group interrupted by O, N or S, each having 1 to 10 carbon atoms, aryl group having 6 to 10 carbon atoms, cycloalkyl or bicycloalkyl group having 5 to 10 carbon atoms, or heterocyclic group having at least one hetero atom selected from O, N and S;

--CN, --OH or --OOCR₁₂ ;

where R₁₂ is an alkyl group or aN alkyl group interrupted with O, N, S, or --COO--, each having 1 to 10 carbon atoms.

10. A laminated light-polarizing sheet according to claim 8 wherein R₉ is alkyl.

11. A laminated light-polarizing sheet according to claim 8 wherein R₈ and R₉ are halogen substituted alkyl or aryl.

12. A laminated light-polarizing sheet according to claim 9 wherein R₉ is alkyl.

13. A laminated light-polarizing sheet according to claim 9 wherein the alkyl and aryl groups are halogen substituted.