Inorganic material composition and utilities thereof

Patent metadata

Field	Value
Publication number	US-11535522-B2
Application number	US-202017117041-A
Country	US
Kind code	B2
Filing date	Dec 9, 2020
Priority date	Apr 22, 2016
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

Inorganic particulate compositions containing inorganic particles associated with a copolymer of a hydrophilic monomer and a hydrophobic monomer associated with the inorganic particles are provided. The particulate composition satisfies at least one of the following properties:
a BET surface area of the inorganic particles is greater than 8 m 2 /g, a Hegman value of the inorganic particles is 75 microns or less, and a rate of water loss from the composition upon drying from a moisture level greater than 2% wt % is at least 30% greater than a composition having a corresponding content of a polyacrylate polymer associated with the particles. A method to prepare the composition and formulations for inks, paints, coatings and filled polymeric articles containing the inorganic particulate composition are also provided.

First claim

We claim:

1. A coating composition comprising:
water;
a binder; and
a particulate composition;
wherein the particulate composition comprises:
particles of an inorganic material, wherein (a) a BET surface area of the inorganic particles is greater than 8 m 2 /g and (b) a Hegman value of the inorganic particles is 75 microns or less; and
a copolymer of a hydrophilic monomer and a hydrophobic monomer associated with the particles of the inorganic material;
wherein a mole ratio of the hydrophobic monomer to the hydrophilic monomer is from 10/1 to 1/1.

2. The coating composition of claim 1 , wherein a moisture pick-up of the particulate composition is 1.0 wt % or less when exposed to 98% relative humidity for 24 hours at 23° C.

3. The coating composition of claim 1 , wherein the inorganic material is an alkaline earth metal carbonate.

4. The coating composition of claim 3 , wherein the alkaline earth metal carbonate comprises a carbonate of calcium, a carbonate of magnesium, a carbonate of barium and a carbonate of strontium.

5. A substrate having at least one surface coated with the coating composition of claim 1 ; wherein the substrate is selected from paper, cardboard, containerboard, plastic, cellophane, textile, wood, glass, metal and concrete.

6. The coating composition of claim 1 , wherein the particulate composition, upon drying from a moisture level greater than 2% wt %, also has a rate of water loss of at least 30% greater than a composition having a corresponding content of a polyacrylate polymer associated with the particles of the inorganic material.

Assignees

• Imerys Usa Inc

Inventors

• Singh Virendra
• Paynter Christopher
• Gittins David
• Shurling Dickey
• Wicks Douglas
• Preston Janet
• Findlay Andrew

Classifications

• C09C1/021

  Calcium carbonates · CPC title

• C09D11/033

  characterised by the solvent · CPC title

• C01P2006/12

  Surface area · CPC title

• D21H21/52

  Additives of definite length or shape · CPC title

• C09D11/08

  based on natural resins · CPC title