MULTILAYER FILMS INCLUDING THERMOPLASTIC SILICONE BLOCK COPOLYMERS

• US 20070177272A1
• Filed: 12/21/2006
• Published: 08/02/2007
• Est. Priority Date: 12/23/2005
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Johnson, Stephen, Leir, Charles, Benson, Karl, Schneider, Hildegard, Purgett, Mark, Hansen, Richard, Sherman, Audrey, Liu, Richard
• Granted Patent: US 7,820,297 B2
• Time in Patent Office: Days
• US Class Current: 359/584
• CPC Class Codes: B32B 2250/05 5 or more layers
• CPC Class Codes: B32B 2250/24 All layers being polymeric
• CPC Class Codes: B32B 2274/00 Thermoplastic elastomer material thermoplastic elastomer fibres B32B2262/0215, thermoplastic elastomer particles B32B2264/0221, thermoplastic elastomer foam B32B2266/0292
• CPC Class Codes: B32B 2307/418 Refractive
• CPC Class Codes: B32B 2307/42 Polarizing, birefringent, filtering
• CPC Class Codes: B32B 2551/00 Optical elements
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: B32B 27/28 comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
• CPC Class Codes: B32B 27/283 comprising polysiloxanes
• CPC Class Codes: B32B 27/34 comprising polyamides
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: B32B 7/023 Optical properties
• CPC Class Codes: B32B 7/10 at least one layer having inter-reactive properties
• CPC Class Codes: G02B 5/0841 comprising organic materials, e.g. polymers
• CPC Class Codes: G02B 5/305 including organic materials, e.g. polymeric layers
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 428/31565 Next to polyester [polyethylene terephthalate, etc.]
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

A multilayer film includes a first layer of a first polymeric material and a second layer of a second polymeric material. The first material has a first index of refraction and the second material has a second index of refraction less than the first index of refraction. In one embodiment, the second material includes a polydiorganosiloxane polyamide block copolymer. In another embodiment, the second material includes a polydiorganosiloxane polyoxamide block copolymer.

Claims

1. A film comprising:

a first layer comprising a first polymeric material having a first index of refraction; and

a second layer contiguous to said first layer, the second layer comprising a second polymeric material having a second index of refraction less than the first index of refraction, the second polymeric material comprising at least 2 repeat units of Formula I;

wherein each R¹ is independently an alkyl, haloalkyl, aralkyl, alkenyl, aryl, or aryl substituted with an alkyl, alkoxy, or halo;

each Y is independently an alkylene, aralkylene, or a combination thereof;

G is a divalent residue equal to a diamine of formula R³HN-G-NHR³ minus the two —

NHR³ groups;

R³ is hydrogen, alkyl, or taken together with G and to the nitrogen to which they are both attached form a heterocyclic group;

n is independently an integer of 0 to 1500;

each B is independently a covalent bond, an alkylene of 4-20 carbons, an aralkylene, an arylene, or a combination thereof; and

p is an integer of 1 to 10.

2. The film of claim 1 wherein each B is a covalent bond.

3. The film of claim 1, wherein the first material is birefringent.

4. The film of claim 1 wherein a difference between the first index of refraction and the second index of refraction is greater than about 0.05.

5. The film of claim 1 wherein a difference between the first index of refraction and the second index of refraction is greater than about 0.10.

6. The film of claim 1 wherein a difference between the first index of refraction and the second index of refraction is greater than about 0.20.

7. The film of claim 1 wherein a difference between the first index of refraction and the second index of refraction is greater than about 0.30.

8. The film of claim 1 wherein the first polymeric material is selected from the group consisting of polyalkylene naphthalates, isomers of polyalkylene naphthalates, and copolymers of polyalkylene naphthalates.

9. The film of claim 1 wherein the first polymeric material is selected from the group consisting of polyalkylene terephthalates and copolymers of polyalkylene terephthalates.

10. The film of claim 1 further comprising a third layer contiguous with either the first layer or the second layer, the third layer comprising a third material.

11. The film of claim 10 wherein the third material includes one or more materials selected from the group consisting of antistatic additives, ultraviolet light absorbers (UVAs), hindered amine light stabilizers (HALS), dyes, colorants, pigments, antioxidants, slip agents, low adhesion materials, conductive materials, abrasion resistant materials, optical elements, dimensional stabilizers, adhesives, tackifiers, flame retardants, phosphorescent materials, fluorescent materials, nanoparticles, anti-graffiti agents, dew-resistant agents, load bearing agents, silicate resins, light diffusing materials, light absorptive materials and optical brighteners.

12. The film of claim 1 wherein the second layer further includes one or more materials selected from the group consisting of antistatic additives, ultraviolet light absorbers (UVAs), hindered amine light stabilizers (HALS), dyes, colorants, pigments, antioxidants, slip agents, low adhesion materials, conductive materials, abrasion resistant materials, optical elements, dimensional stabilizers, adhesives, tackifiers, flame retardants, phosphorescent materials, fluorescent materials, nanoparticles, anti-graffiti agents, dew-resistant agents, load bearing agents, silicate resins, light diffusing materials, light absorptive materials and optical brighteners.

13. The film of claim 10 wherein the third layer is disposed intermediate the first layer and the second layer.

14. A film comprising:

a first layer comprising a first polymeric material having a first index of refraction; and

a second layer contiguous to said first layer, the second layer comprising a second polymeric material having a second index of refraction less than the first index of refraction, the second material comprising a polydiorganosiloxane polyamide block copolymer.

15. The film of claim 14 wherein the second material comprises a polydiorganosiloxane polyoxamide block copolymer

16. The film of claim 14 wherein a difference between the first index of refraction and the second index of refraction is greater than about 0.05.

17. The film of claim 14, wherein the first material is birefringent.

18. The film of claim 14 wherein the first polymeric material is selected from the group consisting of polyalkylene naphthalates, isomers of polyalkylene naphthalates, and copolymers of polyalkylene naphthalates.

19. The film of claim 14 wherein the first polymeric material is selected from the group consisting of polyalkylene terephthalates and copolymers of polyalkylene terephthalates.

20. The film of claim 14 further comprising a third layer contiguous with either the first layer or the second layer, the third layer comprising a third material.