Acid modified natural filler to initialize the beta-nucleation of polypropylene

Patent metadata

Field	Value
Publication number	US-9528003-B2
Application number	US-201013509129-A
Country	US
Kind code	B2
Filing date	Nov 9, 2010
Priority date	Nov 19, 2009
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

The present invention relates to a composition for beta-nucleation of polypropylene, comprising: (a) a particulate mineral solid support, comprising a compound of a IUPAC Group 2 metal, and (b) on the surface of the particulate solid support (b1) a salt of a dicarboxylic acid, wherein the dicarboxylic acid has from 7 to 10 carbon atoms, and (b2) a dispersing and/or grinding agent.

First claim

The invention claimed is:

1. A process for the preparation of a composition for beta-nucleation of polypropylene, comprising the following steps:
(i) providing a particulate mineral solid support which comprises a compound of a IUPAC Group 2 metal,
(ii) grinding the particulate mineral solid support in the presence of a dispersing and/or grinding agent so that the dispersing and/or grinding agent is adsorbed on its surface, and
(iii) reacting the particulate mineral solid support, having a dispersing and/or grinding agent adsorbed on its surface, with a dicarboxylic acid having from 7 to 10 carbon atoms, wherein step (iii) is carried out during or after step (ii), so that a salt of the dicarboxylic acid forms on the surface of the particulate mineral solid support,
wherein the compound of the IUPAC Group 2 metal is natural ground calcium carbonate, calcium-magnesium carbonate, or any mixture thereof; the natural calcium carbonate is marble, limestone, chalk or any mixture thereof; and the calcium-magnesium carbonate is dolomite, and
wherein at least 80 mole % of the dicarboxylic acid is converted to the salt of the dicarboxylic acid.

2. The process according to claim 1 , wherein step (ii) comprises at least one wet grinding step and/or at least one dry grinding step.

3. The process according to claim 1 , wherein step (ii) comprises at least one wet grinding step and the dispersing and/or grinding agent is a homo- or copolymer of a carboxylic acid salt.

4. The process according to claim 1 , wherein step (ii) comprises at least one dry grinding step and the dispersing and/or grinding agent is a glycol, a polyglycol, a polyalkylene glycol, a sugar, an alkanolamine, or any mixture thereof.

5. The process according to 1 , wherein step (iii) is carried out during the grinding step (ii) by mixing the particulate mineral solid support with the dispersing and/or grinding agent and the dicarboxylic acid and subsequently subjecting the mixture to the grinding step (ii); or wherein step (iii) is carried out after the grinding step (ii) by mixing the particulate mineral solid support with the dispersing and/or grinding agent, followed by subjecting the mixture to the grinding step (ii), and subsequently reacting the ground particulate mineral solid support with the dicarboxylic acid.

6. The process according to claim 1 , wherein the particulate mineral solid support comprises the compound of the IUPAC Group 2 metal in an amount of at least 50 wt %.

7. The process according to claim 1 , wherein the particulate mineral solid support comprises the compound of the IUPAC Group 2 metal in an amount of at least 70 wt %.

8. The process according to claim 1 , wherein the particulate mineral solid support comprises the compound of the IUPAC Group 2 metal in an amount of at least 90 wt %.

9. The process according to claim 1 , wherein the particulate mineral solid support and/or the composition has/have a medium particle size d 50 of from 0.5 μm to 7 μm.

10. The process according to claim 1 , wherein the particulate mineral solid support and/or the composition has/have a specific surface area of from 0.5 m 2 /g to 15 m 2 /g, measured using nitrogen and the BET method according to ISO 9277.

11. The process according to claim 1 , wherein the salt of the dicarboxlic acid is a IUPAC Group 2 metal salt selected from a calcium salt, a magnesium salt, a strontium salt, or any mixture thereof.

12. The process according to claim 1 , wherein the dicarboxylic acid is pimelic acid, suberic acid, azelaic acid, phthalic acid, isophthalic acid, terephthalic acid, or any mixture thereof.

13. The process according to claim 1 , wherein the dicarboxylic acid is pimelic acid.

14. The process according to claim 1 , wherein the salt of the dicarboxylic acid is present in an amount of 0.05 wt % to 10 wt %, based on the weight of the particulate mineral solid support.

15. The process according to claim 1 , wherein the dispersing and/or grinding agent is present in an amount of 0.01 wt % to 2 wt %, based on the weight of the particulate mineral solid support.

16. The process according to claim 1 , wherein the amount of the dicarboxylic acid salt, in mg, on the surface of the particulate mineral solid support, in m 2 , is from 0.15 mg/m 2 to 30 mg/m 2 .

Assignees

• Knerr Michael
• Buri Matthias
• Gane Patrick A C
• Omya Int Ag

Inventors

• Knerr Michael
• Buri Matthias
• Gane Patrick A C

Classifications

• C01P2004/51

  Particles with a specific particle size distribution · CPC title

• C08K5/053

  Polyhydroxylic alcohols · CPC title

• C08K5/098

  Metal salts of carboxylic acids · CPC title

• C09C1/021 Primary

  Calcium carbonates · CPC title

• C08K5/09

  Carboxylic acids; Metal salts thereof; Anhydrides thereof · CPC title