Colorless, transparent and heat resistant polyurethane films and methods for manufacturing the same

• US 10,676,639 B2
• Filed: 09/24/2015
• Issued: 06/09/2020
• Est. Priority Date: 09/26/2014
• Status: Active Grant

• Current Assignee: Covestro Deutschland AG
• Original Assignee: Covestro Deutschland AG
• Inventors: Liu, Songlin, Yuntong, Nie, Ouh, Lena, Mathew, Rachel Tessy
• Primary Examiner(s): Leonard, Michael L
• Application Number:
  US15/513,737
• Publication Number:
  US 20170283650A1
• Time in Patent Office: 1,720 Days
• CPC Class Codes: C08G 18/3212 containing cycloaliphatic groups
• CPC Class Codes: C08G 18/3215 containing aromatic groups or benzoquinone groups
• CPC Class Codes: C08G 18/3221 hydroxylated esters of carboxylic acids other than higher fatty acids
• CPC Class Codes: C08G 18/324 containing only one aromatic ring
• CPC Class Codes: C08G 18/3243 containing two or more aromatic rings
• CPC Class Codes: C08G 18/3851 containing three nitrogen atoms in the ring
• CPC Class Codes: C08G 18/3872 the sulfur atom belonging to a sulfoxide or sulfone group
• CPC Class Codes: C08G 18/4219 from aromatic dicarboxylic acids and dialcohols in combination with polycarboxylic acids and/or polyhydroxy compounds which are at least trifunctional
• CPC Class Codes: C08G 18/4241 from dicarboxylic acids and dialcohols in combination with polycarboxylic acids and/or polyhydroxy compounds which are at least trifunctional
• CPC Class Codes: C08G 18/4277 Caprolactone and/or substituted caprolactone
• CPC Class Codes: C08G 18/792 formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: H01B 1/08 oxides

Abstract

The present inventions concerns compositions for producing thermoset polyurethanes, comprising polyisocyanates and polyols selected from a list consisting of allicyclic, aromatic compounds and branched polyesters. The films obtained from these compositions exhibit a high transparency, high thermal stability and good chemical resistance, and a method to produce the same. The said polyurethane films can be widely used in electronics industry where high transparency, high thermal resistance and good chemical resistance are the main requirements. Particularly, these films can be used as the substrates for conductive coatings and barrier coatings. These functionally coated films are particularly useful in applications such as touch panels or photo-voltaic cells.

Claims

1. A transparent conductive film, comprising a polyurethane film obtained from a composition, comprising polyisocyanates and polyols, wherein the polyol is one of compounds (c) or (g),

2. The transparent conductive film of claim 1, wherein the polyurethane film has a glass transition temperature Tg according to ASTM D3418 of at least 150°

C.

3. The transparent conductive film of claim 1, wherein the polyurethane film has a glass transition temperature Tg according to ASTM D3418 is at least 170°

C.

4. The transparent conductive film of claim 1, wherein the polyurethane film is obtained by casting said composition onto a carrier substrate.

5. The transparent conductive film according to claim 1, wherein the transparent conductive oxide layer is deposited by sputtering, metal organic chemical vapor deposition, metal organic molecular beam deposition, spray pyrolysis and pulsed laser deposition.

6. An electronic device, comprising at least one transparent conductive film according to claim 1.

7. The electronic device according to claim 6, wherein the device is a display, an instrument panel, or a photo-voltaic cell.

8. The transparent conductive film of claim 1, wherein the polyol is compounds (c).

9. The transparent conductive film of claim 1, wherein the polyol is compounds (g).