Fiber reinforced terephthalate-CO-4,4′-bibenzoate copolyester

Patent metadata

Field	Value
Publication number	US-11072685-B2
Application number	US-201916263048-A
Country	US
Kind code	B2
Filing date	Jan 31, 2019
Priority date	Jan 31, 2018
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

Fiber-reinforced terephthalate-co-4,4′-bibenzoate copolyester behaves like a liquid crystalline polymer, providing fast crystallization, short cycling times, high Tg and Tm, high strength and stiffness, while the viscosity is unexpectedly reduced at a low fiber loading ratio. In an injection molding process, the viscosity of the fiber reinforced copolyester at low fiber loading is reduced by increasing the fiber loading.

First claim

The invention claimed is:

1. A fiber-reinforced plastic composition, comprising a polyester comprising:
a) a diol component comprising an alkylene glycol; and
b) a diacid component comprising terephthalate and 4,4′-biphenyl dicarboxylate; and
c) a fiber reinforcing agent, wherein the fiber reinforcing agent is present in a proportion of from 10 to 30 percent by weight of the composition; and
wherein the polyester alone comprises a frustrated liquid crystalline polymer.

2. The composition of claim 1 , wherein the diol component comprises ethylene glycol.

3. The composition of claim 1 , wherein the diacid component comprises from 10 to 90 mole percent terephthalate and from 90 to 10 mole percent 4,4′-biphenyldicarboxylate.

4. The composition of claim 1 , wherein the diacid component further comprises another diacid or ester producing equivalent thereof, wherein the other diacid or ester producing equivalent thereof is present in an amount less than 10 mole percent, based on the total moles in the diacid component.

5. The composition of claim 1 , wherein the fiber reinforcing agent is selected from carbon fiber, glass fiber, amorphous silica, asbestos, calcium silicate, aluminum silicate, magnesium carbonate, kaolin, chalk, quartz, mica, and feldspar.

6. The composition of claim 1 , wherein the fiber reinforcing agent comprises glass fiber.

7. The composition of claim 1 , wherein the fiber reinforcing agent comprises short fibers having an aspect ratio greater than 6 and less than 1000.

8. The composition of claim 1 , wherein the fiber reinforcing agent comprises long fibers having an aspect ratio greater than 1000.

9. The composition of claim 1 , wherein the fiber-reinforced plastic composition has a reduced melt viscosity relative to the polyester alone.

10. The composition of claim 1 , comprising a lower enthalpy of melting relative to the polyester alone, the same or lower melting temperature relative to the polyester alone, a higher heat distortion temperature under a specified load of 455 kPa relative to the polyester alone, and/or a heat of cold crystallization equal to or less than 1 J/g.

11. The composition of claim 1 , wherein the diacid component comprises from 25 to 65 mole percent terephthalate and from 75 to 35 mole percent 4,4′-biphenyl dicarboxylate.

12. A method for molding a fiber-reinforced polyester, comprising melt processing a polyester composition comprising:
a) a diol component comprising an alkylene glycol; and
b) a diacid component comprising terephthalate and 4,4′-biphenyl dicarboxylate; and
c) a fiber reinforcing agent, wherein the fiber reinforcing agent is present in a proportion of from 10 to 30 percent by weight of the composition;
wherein the polyester alone comprises a frustrated liquid crystalline polymer; and
wherein the polyester composition has a reduced melt viscosity relative to the polyester alone; and
forming the resulting composite in the shape of a mold.

13. The method of claim 12 , wherein the diol component comprises ethylene glycol.

14. The method of claim 12 , wherein the diacid component comprises 10 to 90 mole percent terephthalate and from 90 to 10 mole percent 4,4′-biphenyldicarboxylate.

15. The method of claim 12 , comprising injection molding.

16. The method of claim 12 , comprising removing the shaped polyester from the mold.

17. The method of claim 12 , further comprising adjusting the proportion of the fiber reinforcing agent to control the melt viscosity, crystallization characteristics, and/or mechanical properties.

18. The composition produced according to claim 12 .

19. A method to control the viscosity, crystallization characteristics, and/or mechanical properties of a copolyester, comprising:
melt processing a polyester composition comprising:
a) a diol component comprising an alkylene glycol; and
b) a diacid component comprising terephthalate and 4,4′-biphenyl dicarboxylate; and
c) a fiber reinforcing agent;

wherein the polyester alone comprises a frustrated liquid crystalline polymer;
forming the resulting composite in the shape of a mold; and
selecting a proportion of the fiber reinforcing agent to adjust the viscosity, crystallization characteristics, and/or mechanical properties of the composite, wherein the proportion of the fiber reinforcing agent is from 10 to 30 percent by weight of the polyester composition.

20. The composition produced according to the method of claim 19 .

21. A fiber-reinforced plastic composition, comprising a polyester comprising:
a) a diol component comprising an alkylene glycol; and
b) a diacid component comprising terephthalate and 4,4′-biphenyl dicarboxylate; and
c) a fiber reinforcing agent, wherein the fiber reinforcing agent is present in a proportion of from 10 to 30 percent by weight of the composition;
wherein the diol component comprises ethylene glycol;
wherein the diacid component comprises from 10 to 90 mole percent terephthalate and from 90 to 10 mole percent 4,4′-biphenyl dicarboxylate;
wherein the fiber reinforcing agent is selected from carbon fiber, glass fiber, amorphous silica, asbestos, calcium silicate, aluminum silicate, magnesium carbonate, kaolin, chalk, quartz, mica and feldspar;
wherein the fiber reinforcing agent is present in a proportion of from 0.1 to 60 percent by weight of the composition; and
wherein the fiber reinforcing agent comprises short fibers having an aspect ratio greater than 6 and less than 1000; and
wherein the polyester alone comprises a frustrated liquid crystalline polymer.

22. A fiber-reinforced plastic composition, comprising a polyester comprising:
a) a diol component comprising an alkylene glycol; and
b) a diacid component comprising terephthalate and 4,4′-biphenyl dicarboxylate; and
c) a fiber reinforcing agent, wherein the fiber reinforcing agent is present in a proportion of from 10 to 30 percent by weight of the composition;
wherein the diol component comprises ethylene glycol;
wherein the diacid component comprises from 10 to 90 mole percent terephthalate and from 90 to 10 mole percent 4,4′-biphenyl dicarboxylate;
wherein the fiber reinforcing agent is selected from carbon fiber, glass fiber, amorphous silica, asbestos, calcium silicate, aluminum silicate, magnesium carbonate, kaolin, chalk, quartz, mica and feldspar;
wherein the polyester alone comprises a frustrated liquid crystalline polymer; and
wherein the fiber reinforcing agent comprises long fibers having an aspect ratio greater than 1000.

23. A fiber-reinforced plastic composition, comprising a polyester comprising:
a) a diol component comprising an alkylene glycol; and
b) a diacid component comprising terephthalate and 4,4′-biphenyl dicarboxylate; and
c) a fiber reinforcing agent, wherein the fiber reinforcing agent is present in a proportion wherein the diol component comprises ethylene glycol;
wherein the diacid component comprises from 10 to 90 mole percent terephthalate and from 90 to 10 mole percent 4,4′-biphenyl dicarboxylate;
wherein the diacid component further comprises another diacid or ester producing equivalent thereof, wherein the other diacid or ester producing equivalent thereof is present in an amount less than 10 mole percent, based on the total moles in the diacid component;
wherein the fiber reinforcing agent is selected from carbon fiber, glass fiber, amorphous silica, asbestos, calcium silicate, aluminum silicate, magnesium carbonate, kaolin, chalk, quartz, mica and feldspar;

Assignees

• Exxonmobil Chemical Patents Inc
• Univ Case Western Reserve

Inventors

• Schiraldi David A
• Sun Hua
• Yang Yong

Classifications

• C08G63/185 Primary

  containing two or more aromatic rings · CPC title

• B29K2309/08

  Glass · CPC title

• B29C45/0001

  characterised by the choice of material · CPC title

• B29K2067/003

  PET, i.e. poylethylene terephthalate · CPC title

• C08J5/043

  with glass fibres · CPC title