Light modulating device having a vinyl ether-based matrix

• US 5,641,426 A
• Filed: 04/29/1994
• Issued: 06/24/1997
• Est. Priority Date: 04/29/1994
• Status: Expired due to Fees

• Current Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Nerad, Bruce A., Vesley, George F.
• Primary Examiner(s): KELLY, CYNTHIA HARRIS
• Application Number:
  US08/235,561
• Time in Patent Office: 1,152 Days
• Field of Search: 252/299.01, 252/582
• US Class Current: 252/299.01
• CPC Class Codes: C09K 19/544 as dispersing or encapsulating medium around the liquid crystal
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals

Abstract

An optically responsive film that includes liquid crystal dispersed in a crosslinked polymer matrix that includes the reaction product of an isotropic polymerizable mixture that includes at least one vinyl ether.

Claims

1. An optically responsive film comprising liquid crystal dispersed in a crosslinked polymer matrix comprising the reaction product of an isotropic polymerizable mixture that includes at least one multi-functional vinyl ether,

said vinyl ether having two or more polymerizable carbon-carbon double bonds, each of which is linked via a single bond to an oxygen atom where the other group bonded to the oxygen atom is neither a carbonyl group nor a hydrogen atom.

2. The optically responsive film of claim 1 wherein said film comprises the reaction product of said multi-functional vinyl ether and at least one mono-functional vinyl ether.

3. The optically responsive film of claim 1 wherein said film comprises the reaction product of said multi-functional vinyl ether and at least one multi-functional reactant other than a vinyl ether.

4. The optically responsive film of claim 3 wherein said multi-functional reactant other than a vinyl ether, comprises a thiol, ene, silicon hydride, alcohol, epoxy, or combination thereof.

5. The optically responsive film of claim 1 wherein said vinyl ether comprises 1,4-cyclohexanedimethanol divinyl ether.

6. The optically responsive film of claim 1 wherein said vinyl ether comprises triethylene glycol divinyl ether.

7. The optically responsive film of claim 1 wherein said vinyl ether comprises a vinyl ether-functional urethane oligomer.

8. The optically responsive film of claim 1 wherein said film comprises the reaction product of said vinyl ether and at least one copolymerizable reactant provided with one or more groups classified as Lewis acids.

9. The optically responsive film of claim 8 wherein said copolymerizable reactant comprises acrylic acid, methacrylic acid, or a combination thereof.

10. The optically responsive film of claim 1 wherein said film comprises the reaction product of said multi-functional vinyl ether and a maleate, fumarate, or a combination thereof.

11. An optically responsive film comprising liquid crystal dispersed in a crosslinked polymer matrix comprising the reaction product of an isotropic polymerizable mixture that includes at least one vinyl ether and at least one multi-functional reactant other than a vinyl ether,

said vinyl ether having one or more polymerizable carbon-carbon double bonds, each of which is linked via a single bond to an oxygen atom where the other group bonded to the oxygen atom is neither a carbonyl group nor a hydrogen atom, and being selected from the group consisting of butanediol divinyl ether, 1,4-cyclohexanedimethanol divinyl ether, the propenyl ether of propylene carbonate, and triethylene glycol divinyl ether.

12. An optically responsive film comprising liquid crystal dispersed in a crosslinked matrix comprising the reaction product of an isotropic polymerizable mixture that includes at least one vinyl ether and at least one multi-functional reactant other than a vinyl ether,

said vinyl ether having one or more polymerizable carbon-carbon double bonds, each of which is linked via a single bond to an oxygen atom where the other group bonded to the oxygen atom is neither a carbonyl group nor a hydrogen atom, and being selected from the group consisting of 1,4-cyclohexanedimethanol monovinyl ether or esters thereof, a vinyl ether-functional urethane oligomer, and a fluorinated vinyl ether.

13. An optically responsive film comprising liquid crystal dispersed in a crosslinked polymer matrix comprising the reaction product of an isotropic polymerizable mixture that includes at least one vinyl ether, at least one multi-functional reactant other than a vinyl ether, and a maleate, fumarate, or combination thereof,

said vinyl ether having one or more polymerizable carbon-carbon double bonds, each of which is linked via a single bond to an oxygen atom where the other group bonded to the oxygen atom is neither a carbonyl group nor a hydrogen atom.

14. An optically responsive film comprising liquid crystal dispersed in a crosslinked polymer matrix comprising the reaction product of an isotropic polymerizable mixture that includes at least one vinyl ether, at least one multi-functional reactant other than a vinyl ether, and at least one copolymerizable reactant provided with one or more groups classified as Lewis acids,

said vinyl ether having one or more polymerizable carbon-carbon double bonds, each of which is linked via a single bond to an oxygen atom where the other group bonded to the oxygen atom is neither a carbonyl group nor a hydrogen atom.

15. The optically responsive film of claim 14 wherein said copolymerizable reactant comprises acrylic acid, methacrylic acid, or a combination thereof.

16. A method of preparing an optically responsive film comprising the steps of:

(a) combining liquid crystal, at least one vinyl ether, and at least one mono-functional reactant other than a vinyl ether to form an isotropic mixture,

said vinyl ether having one or more polymerizable carbon-carbon double bonds, each of which is linked via a single bond to an oxygen atom where the other group bonded to the oxygen atom is neither a carbonyl group nor a hydrogen atom; and

(b) polymerizing said vinyl ether and said mono-functional reactant in the presence of said liquid crystal to cause phase separation of said liquid crystal and thereby form an optically responsive film comprising liquid crystal dispersed in a crosslinked polymer matrix.

17. A method of preparing an optically responsive film comprising the steps of:

(a) combining liquid crystal, at least one vinyl ether, and a copolymerizable reactant provided with one or more groups classified as Lewis acids comprising acrylic acid, methacrylic acid, or a combination thereof to form an isotropic mixture,

said vinyl ether having one or more polymerizable carbon-carbon double bonds, each of which is linked via a single bond to an oxygen atom where the other group bonded to the oxygen atom is neither a carbonyl group nor a hydrogen atom; and

(b) polymerizing said vinyl ether and said copolymerizable reactant in the presence of said liquid crystal to cause phase separation of said liquid crystal and thereby form an optically responsive film comprising liquid crystal dispersed in a crosslinked polymer matrix.

18. A method of preparing an optically responsive film comprising the steps of:

(a) combining liquid crystal, at least one vinyl ether, and a maleate, fumarate, or combination thereof to form an isotropic mixture,

said vinyl ether having one or more polymerizable carbon-carbon double bonds, each of which is linked via a single bond to an oxygen atom where the other group bonded to the oxygen atom is neither a carbonyl group nor a hydrogen atom; and

(b) polymerizing said vinyl ether and said maleate, fumarate, or combination thereof in the presence of said liquid crystal to cause phase separation of said liquid crystal and thereby form an optically responsive film comprising liquid crystal dispersed in a crosslinked polymer matrix.