Additive composition and method for producing a polymer composition using the same

Patent metadata

Field	Value
Publication number	US-11118027-B2
Application number	US-201916518473-A
Country	US
Kind code	B2
Filing date	Jul 22, 2019
Priority date	Jul 24, 2018
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

An additive composition comprises one or more calcium cis-1,2-cyclohexanedicarboxylate salts. 25 mol. % or more of the calcium cis-1,2-cyclohexanedicarboxylate salts present in the additive composition are calcium cis-1,2-cyclohexanedicarboxylate monohydrate. The additive composition has a gravimetric water content of about 20% or less. A method for producing a thermoplastic polymer composition entails mixing the additive composition with a thermoplastic polymer, melting the resulting admixture, and letting the admixture solidify to produce a polymer composition.

First claim

What is claimed is:

1. An additive composition comprising one or more calcium cis-1,2-cyclohexanedicarboxylate salts, wherein 25 mol. % or more of the calcium cis-1,2-cyclohexanedicarboxylate salts present in the additive composition are calcium cis-1,2-cyclohexanedicarboxylate monohydrate, and the additive composition has a gravimetric water content of about 20% or less.

2. The additive composition of claim 1 , wherein the additive has a gravimetric water content of 2% to about 20%.

3. The additive composition of claim 1 , wherein about 33 mol. % or more of the calcium cis-1,2-cyclohexanedicarboxylate salts present in the additive composition are calcium cis-1,2-cyclohexanedicarboxylate monohydrate.

4. The additive composition of claim 3 , wherein about 50 mol. % or more of the calcium cis-1,2-cyclohexanedicarboxylate salts present in the additive composition are calcium cis-1,2-cyclohexanedicarboxylate monohydrate.

5. The additive composition of claim 4 , wherein about 75 mol. % or more of the calcium cis-1,2-cyclohexanedicarboxylate salts present in the additive composition are calcium cis-1,2-cyclohexanedicarboxylate monohydrate.

6. The additive composition of claim 5 , wherein about 90 mol. % or more of the calcium cis-1,2-cyclohexanedicarboxylate salts present in the additive composition are calcium cis-1,2-cyclohexanedicarboxylate monohydrate.

7. The additive composition of claim 1 , wherein the additive composition further comprises a metal salt of a fatty acid.

8. The additive composition of claim 7 , wherein the fatty acid is selected from the group consisting of C 8 -C 28 fatty acids.

9. The additive composition of claim 8 , wherein the fatty acid is selected from the group consisting of C 12 -C 22 fatty acids.

10. The additive composition of claim 9 , wherein the fatty acid is stearic acid.

11. The additive composition of claim 7 , wherein the metal salt of a fatty acid comprises a cation selected from the group consisting of alkali metal cations, alkaline earth metal cations, and group 12 element cations.

12. The additive composition of claim 11 , wherein the metal salt of a fatty acid comprises a group 12 element cation.

13. The additive composition of claim 12 , wherein the metal salt of a fatty acid comprises a zinc cation.

14. The additive composition of claim 13 , wherein the additive composition further comprises zinc stearate.

15. A method for producing a polymer composition, the method comprising the steps of:
(a) providing a thermoplastic polymer, the thermoplastic polymer having a melting point;
(b) providing the additive composition of claim 1 ;
(c) combining the thermoplastic polymer and the additive composition to produce an admixture;
(d) heating the admixture to a temperature above the melting point of the thermoplastic polymer to produce a molten admixture; and
(e) reducing the temperature of the molten admixture to a temperature below the melting point of the thermoplastic polymer, thereby producing a polymer composition.

16. The method of claim 15 , wherein the thermoplastic polymer is a polyolefin.

17. The method of claim 16 , wherein the polyolefin is a polypropylene.

18. The method of claim 16 , wherein the polyolefin is a polyethylene.

19. The method of claim 15 , wherein the admixture contains about 50 ppm to about 5,000 ppm of calcium cis-1,2-cyclohexanedicarboxylate salts.

20. The method of claim 19 , wherein the admixture contains about 100 ppm to about 2,000 ppm of calcium cis-1,2-cyclohexanedicarboxylate salts.

Assignees

• Milliken & Co

Inventors

• Dotson Darin L
• Xu Xiaoyou
• Forrister Walter
• Tsai Chi-Chun

Classifications

• C08K5/0083 Primary

  Nucleating agents promoting the crystallisation of the polymer matrix · CPC title

• C08J3/20

  Compounding polymers with additives, e.g. colouring · CPC title

• C08K5/098 Primary

  Metal salts of carboxylic acids · CPC title

• C08J3/203

  Solid polymers with solid and/or liquid additives · CPC title

• C08J2323/06

  Polyethene · CPC title