# US 2019/0169389 A1 · One-step process for making a polymer composite coating with high barrier

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- Number: US 2019/0169389 A1
- Document ID: US20190169389A1
- Status: Published application
- Kind: A1
- Application number: 16/273,075
- Filed: 2019-02-11
- Published: 2019-06-06
- Earliest claimed: 2014-05-21
- Assignees: Agency for Science, Technology and Research
- Applicants: Agency for Science, Technology and Research
- Inventors: Xu LI; Yu Yuan CHIENG; Siew Yee WONG; Xikui ZHANG
- Web page: https://patentgrep.com/patent/US20190169389A1

## CPC

- C08F 20/06: Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
- C08F 2/44: Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
- C08J 7/0427: {with only one layer of a composition containing a polymer binder (with more layers C08J7/042)}
- C08J 7/043: Improving the adhesiveness of the coatings per se, e.g. forming primers (adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50)
- C08J 7/048: Forming gas barrier coatings
- C09D 4/06: {Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond} in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
- C09D 133/02: Homopolymers or copolymers of acids; Metal or ammonium salts thereof
- C08J 2429/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08J 2433/02: Homopolymers or copolymers of acids; Metal or ammonium salts thereof
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)

## Abstract

This invention relates to a a one-step process for making a polymer composite suspension for coating plastic films characterized in that a first polymer is synthesized in-situ optionally in the presence of other polymers and in the presence of clay. Preferably the polymer composite suspension comprises a) 1.0 to 11.0 wt % of clay or silane modified clay, b) 0.1 to 10.0 wt % of poly (acrylic acid), which is a copolymer of acrylic acid (AA) with at least one other monomer selected from 2-ethylhexyl acrylate (EHA), β-carboxyethyl acrylate (β-CEA), methacrylamidoethyl ethylene urea (WAM II) and ethoxylated behenyl methacrylate (β-FM), c) 1.0 to 15.0 wt % of other polymers, preferably poly (vinyl alcohol) and d) 70 to 97 wt % of water or mixture of water with 2-propanol. The coating films made from the suspensions show good barrier capabilities against water vapor and oxygen can be used to make barrier layers on or within plastic films for packaging applications. The invention also relates to methods for making silane modified clay usable in the process for making the suspensions.

## Claims

### Claim at position 1

-11. (canceled)

### Claim 12

A polymeric coating suspension that comprises:
a) 1.0 to 11.0 wt % of clay or silane modified clay,
b) 0.1 to 10.0 wt % of poly (acrylic acid) copolymer, which is a copolymer of acrylic acid (AA) with at least one other monomer selected from 2-ethylhexyl acrylate (EHA), β-carboxyethyl acrylate (β-CEA), methacrylamidoethyl ethylene urea (WAM II) and ethoxylated behenyl methacrylate (β-EM),
c) 1.0 to 15.0 wt % of other polymers and
d) 70 to 97 wt % of water or mixture of water with 2-propanol.

### Claim 13 (depends on 12)

The suspension according to claim 12, wherein poly (acrylic acid) is derived from a monomer mixture that comprises:
a) 50 to 90 wt % of acrylic acid,
b) 5 to 30 wt % of 2-ethylhexyl acrylate,
c) 0.5 to 10 wt % of β-carboxyethyl acrylate,
d) 0.5 to 10 wt % of methacrylamidoethyl ethylene urea,
e) 0.5 to 10 wt % of ethoxylated behenyl methacrylate.

### Claim 14

A method for making silane modified clay by dispersing the clay in an aqueous solution and adding a silane or a mixture of silanes at a slow injection speed under high homogenization speed.

### Claim 15 (depends on 14)

The method according to claim 14 wherein the silane or silane mixture is added by injection with a flow rate of 0.1 to 3.0 ml/min.

### Claim 16 (depends on 14)

The method of according to claim 14 wherein the speed of homogenization is in the range of 10,000 to 20,000 rpm.

### Claim 17 (depends on 14)

The method according to claim 14 which comprises a heating step after the addition of the silanes.

### Claim at position 8

-25. (canceled)