Use of surface-reacted calcium carbonate as anti-blocking agent

Patent metadata

Field	Value
Publication number	US-10676624-B2
Application number	US-201615576154-A
Country	US
Kind code	B2
Filing date	May 27, 2016
Priority date	Jun 10, 2015
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

The present invention relates to the use of a surface-reacted calcium carbonate as an anti-blocking agent in polymer(s) containing compositions, wherein the surface-reacted calcium carbonate is a reaction product of natural ground or precipitated calcium carbonate with carbon dioxide and one or more H3O+ ion donors in an aqueous medium, wherein the carbon dioxide is formed in situ by the H3O+ ion donors treatment and/or is supplied from an external source, an anti-blocking agent comprising surface-reacted calcium carbonate or a combination of surface reacted calcium carbonate and mineral material, a method for controlling the blocking of polymer(s) containing compositions, a polymer(s) containing composition comprising surface reacted calcium carbonate or a combination of surface reacted calcium carbonate and mineral material, a coating composition comprising such polymer(s) containing composition, as well as a substrate coated with such coating composition.

First claim

The invention claimed is:

1. A method for controlling blocking of a polymer in a polymer containing composition coated onto a substrate, wherein the method comprises incorporating a surface-reacted calcium carbonate as an anti-blocking agent in a polymer containing composition coated onto a substrate, wherein the surface-reacted calcium carbonate is a reaction product of natural ground or precipitated calcium carbonate with carbon dioxide and one or more H 3 O+ ion donors in an aqueous medium, wherein the carbon dioxide is formed in situ by the H 3 O+ ion donor treatment and/or is supplied from an external source, and wherein the polymer-containing composition is coated onto the substrate at a coat weight of 1 to 30 g/m 2 .

2. The method according to claim 1 , wherein the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate comprising marble, chalk, dolomite, limestone, and any mixture thereof, with carbon dioxide and one or more H 3 O + ion donors in an aqueous medium, wherein the carbon dioxide is formed in situ by the H 3 O + ion donor treatment and/or is supplied from an external source.

3. The method accordingly to claim 1 , wherein the surface-reacted calcium carbonate is a reaction product of precipitated calcium carbonate comprising one or more aragonitic, vateritic, and calcitic mineralogical crystal forms, with carbon dioxide and one or more H 3 O + ion donors in an aqueous medium, wherein the carbon dioxide is formed in situ by the H 3 O + ion donor treatment and/or is supplied from an external source.

4. The method according to claim 1 , wherein the surface-reacted calcium carbonate has a specific surface area of from 20 m 2 /g to 200 m 2 /g, measured using nitrogen and the BET method according to ISO 9277.

5. The method according to claim 1 , wherein the surface-reacted calcium carbonate has a specific surface area of from 20 m 2 /g to 100 m 2 /g, measured using nitrogen and the BET method according to ISO 9277.

6. The method according to claim 1 , wherein the surface-reacted calcium carbonate has a volume median grain diameter d 50 (vol) of from 1 to 50 μm.

7. The method according to claim 1 , wherein the surface-reacted calcium carbonate has a volume median grain diameter d 50 (vol) of from 1 to 8 μm.

8. The method according to claim 1 , wherein the surface-reacted calcium carbonate has an intra-particle intruded specific pore volume of 0.1 to 1.3 cm 3 /g, calculated from a mercury intrusion porosimetry measurement.

9. The method according to claim 1 , wherein the polymer has a glass transition temperature T g in the range from 1 to 50° C.

10. The method according to claim 1 , wherein the polymer has a glass transition temperature T g in the range from 10 to 40° C.

11. The method according to claim 1 , wherein the polymer containing composition further comprises an additional mineral material as an anti-blocking agent.

12. The method according to claim 11 , wherein the additional mineral material comprises one or more of precipitated calcium carbonate (PCC), natural ground calcium carbonate (GCC), dolomite, talc, bentonite, clay, magnesite, satin white, sepiolite, huntite, diatomite, a silicate, and titanium dioxide.

13. The method according to claim 11 , wherein the additional mineral material is natural ground calcium carbonate (GCC).

14. The method according to claim 11 , wherein the surface reacted calcium carbonate and the mineral material are present in a weight ratio of from 1:15 to 15:1.

15. The method according to claim 11 , wherein the surface reacted calcium carbonate and the mineral material are present in a weight ratio of from 1:7.5 to 7.5:1.

16. The method according to claim 11 , wherein the surface reacted calcium carbonate and the mineral material are present in a weight ratio of from 1:4 to 4:1.

17. The method according to claim 1 , wherein the polymer comprises one or more of homo- and/or copolymers of monomers selected from the group consisting of alkyl (meth)acrylates, methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, acid monomers, acrylic acid, methacrylic acid, esters of acylic acid, esters of methacrylic acid, ethylenically unsaturated nitriles, acrylonitrile, ethylene, propylene, butadiene, styrene, and salts thereof.

18. The method according to claim 1 , wherein the polymer is an aqueous polymer dispersion comprising at least one copolymer obtained by emulsion polymerisation of:
(a) one or more principal monomers selected from the group consisting of C 1 -C 4 alkyl (meth)acrylates,
(b) 0.1 to 5 wt % of one or more acid monomers,
(c) 0 to 20 wt % of acrylonitrile, and
(d) 0 to 10 wt % of further monomers other than the monomers (a) to (c),

wherein the glass transition temperature of the copolymer is in the range from 10 to 45° C., and wherein the emulsion polymerization is carried out in an aqueous medium in the presence of at least one carbohydrate compound.

19. The method according to claim 1 , wherein the surface reacted calcium carbonate or a combination of the surface reacted calcium carbonate and an additional mineral material is present in the polymer containing composition in an amount of from 5 to 40 wt %, based on the dry weight of the polymer.

20. The method according to claim 1 , wherein the surface reacted calcium carbonate or a combination of the surface reacted calcium carbonate and an additional mineral material is present in the polymer containing composition in a weight based ratio of surface reacted calcium carbonate or a combination of surface reacted calcium carbonate and additional mineral material to polymer of 1:9 to 4:1.

21. The method according to claim 1 , wherein the surface reacted calcium carbonate or a combination of the surface reacted calcium carbonate and an additional mineral material is present in the polymer containing composition in a weight based ratio of surface reacted calcium carbonate or a combination of surface reacted calcium carbonate and additional mineral material to polymer of 1:3 to 3:1.

22. The method according to claim 1 , wherein the substrate is selected from the group consisting of a paper, a board, a paper board, a non-woven product, a packaging material, and a surface finishing.

23. The method according to claim 1 , wherein the polymer containing composition onto the substrate at a coat weight from 2 to 10 g/m 2 .

24. The method according to claim 1 , wherein the surface-reacted calcium carbonate is present in the polymer containing composition in an amount of 5 to 50 wt. %, based on the dry weight of the polymer.

25. The method according to claim 1 , wherein the surface-reacted calcium carbonate is present in the polymer containing composition in an amount of 10 to 50 wt. %, based on the dry weight of the polymer.

Assignees

• Omya Int Ag

Inventors

• Gane Patrick A C
• Ohr Steffen
• Ridgway Catherine Jean
• Hunziker Philipp

Classifications

• C09C1/022 Primary

  Treatment with inorganic compounds · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• C09D7/69

  Particle size larger than 1000 nm · CPC title

• C08K2003/265

  Calcium, strontium or barium carbonate · CPC title

• C08L33/08

  Homopolymers or copolymers of acrylic acid esters · CPC title