Polyesters with specified crystallization half-times

Patent metadata

Field	Value
Publication number	US-10836899-B2
Application number	US-201816219085-A
Country	US
Kind code	B2
Filing date	Dec 13, 2018
Priority date	Dec 13, 2018
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A semi-crystalline polyester comprising a repeat unit of the formula:

wherein A is an aliphatic, aromatic, or heterocyclic group; R 1 is selected from the group consisting of 1,4-butanediol residue and 1,4-cyclohexanedimethanol residue; R 2 is neopentanediol residue; m is between 50 and 99 inclusive; n is between 1 and 50 inclusive; x is between 1 and 200 inclusive; and wherein said semi-crystalline polyester exhibits a minimum crystallization half-time of about 0.3 minutes or greater, or about 0.5 minutes or greater or about 0.6 minutes or greater or about 0.7 minutes or greater is described. The polyesters of the present invention may in various embodiments demonstrate one or more desirable performance characteristics and accordingly are particularly useful in applications and utilities wherein those high levels of performance for such characteristics are required. A process for forming the semi-crystalline polyester is also disclosed.

First claim

That which is claimed is:

1. A semi-crystalline polyester comprising a repeat unit of the formula:

wherein A is an aliphatic, aromatic, or heterocyclic group; R 1 is selected from the group consisting of 1,4-butanediol residue and 1,4-cyclohexanedimethanol residue; R 2 is neopentanediol residue; m is between 50 and 99 inclusive; n is between 1 and 50 inclusive; x is between 1 and 200 inclusive; and wherein said semi-crystalline polyester exhibits a minimum crystallization half-time of about 0.3 minutes or greater.

2. The semi-crystalline polyester of claim 1 wherein said minimum crystallization half-time is 0.5 minutes or greater.

3. The semi-crystalline polyester of claim 2 wherein said minimum crystallization half-time is 0.6 minutes or greater.

4. The semi-crystalline polyester of claim 1 wherein said semi-crystalline polyester has a melt point of between 240° C. and 275° C.

5. The semi-crystalline polyester of claim 1 wherein R 1 is 1,4-butanediol residue.

6. The semi-crystalline polyester of claim 1 wherein R 1 is 1,4-cyclohexanedimethyl residue.

7. The semi-crystalline polyester of claim 1 wherein m is between 65 and 95 inclusive.

8. The semi-crystalline polyester of claim 1 wherein n is between 5 and 35 inclusive.

9. The semi-crystalline polyester of claim 1 wherein n is between 10 and 20 inclusive.

10. A composition comprising the semi-crystalline polyester of claim 1 .

11. The composition of claim 10 further comprising at least one ingredient selected from the group consisting of reinforcements, mold release additives, fillers, surface friction modifiers, light and heat stabilizers, extrusion aids, antistatic agents, colorants, dyes, pigments, fluorescent brighteners, antimicrobials, anticounterfeiting markers, hydrophobic and hydrophilic enhancers, viscosity modifiers, slip agents, tougheners, adhesion promoters toners and colorants.

12. A film comprising the semi-crystalline polyester of claim 1 .

13. The film of claim 12 wherein said film is a monolayer film.

14. The film of claim 13 wherein said monolayer film is biaxially oriented.

15. The film of claim 12 wherein said film is the backsheet of a photovoltaic module.

16. The film of claim 12 wherein said monolayer film is the backsheet of a photovoltaic module.

17. A photovoltaic module comprising the film of claim 12 .

18. An injection molded article comprising the semi-crystalline polyester of claim 1 .

Assignees

• Eastman Chem Co

Inventors

• Porter David Scott
• Li Wentao
• Goetz Sarah Exley
• Pressley Aireal Denise
• Desai Amit Vasant
• Hu Yue Rachel
• Adams Steven J

Classifications

• H10F19/85

  Protective back sheets · CPC title

• Y02E10/50

  Photovoltaic [PV] energy · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08G63/199 Primary

  Acids or hydroxy compounds containing cycloaliphatic rings · CPC title