# US 2025/0154725 A1 · Coated pearl paper and method for producing the same

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- Number: US 2025/0154725 A1
- Document ID: US20250154725A1
- Status: Published application
- Kind: A1
- Application number: 18/412,330
- Filed: 2024-01-12
- Published: 2025-05-15
- Earliest claimed: 2023-11-13
- Assignees: Nan Ya Plastics Corporation
- Applicants: Nan Ya Plastics Corporation
- Inventors: TE-CHAO LIAO; CHUN-CHE TSAO; CHENG-HUNG CHEN
- Web page: https://patentgrep.com/patent/US20250154725A1

## CPC

- D21H 19/84: on both sides of the substrate
- D21H 19/385: {Oxides, hydroxides or carbonates}
- D21H 19/62: Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H 19/82: superposed {(D21H19/84 takes precedence)}
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR

## Abstract

A coated pearl paper and a method for producing the same are provided. The coated pearl paper includes a pearl patern and a coating layer. The pearl paper includes a major layer and two minor layers arranged at two sides of the major layer. The major layer includes a first resin and multiple first mixed inorganic particles, and each of the minor layers includes a second resin and multiple second mixed inorganic particles. A coating liquid forming the coating layer includes a third resin, multiple third mixed inorganic particles, and water. Based on a total weight of the coating liquid being 100 wt %, a content of the third resin is between 18.5 wt % and 21.5 wt %, a content of the third mixed inorganic particles is between 4 wt % and 8 wt %, and a content of the water is between 71.8 wt % and 76.8 wt %.

## Claims

### Claim 1

A coated pearl paper, comprising:
a pearl paper including a major layer and two minor layers arranged at two sides of the major layer, wherein the major layer includes a first resin and a plurality of first mixed inorganic particles, the first resin includes polypropylene, the first mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide, each of the minor layers includes a second resin and a plurality of second mixed inorganic particles, the second resin includes polypropylene, and the second mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide; and
a coating layer formed by coating a coating liquid onto one of the minor layers of the pearl paper, wherein the coating liquid includes a third resin, a plurality of third mixed inorganic particles, and water;
wherein the third resin is an acrylate graft-modified polyurethane resin, and the third mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide;
wherein, based on a total weight of the coating liquid being 100 wt %, a content of the third resin is between 18.5 wt % and 21.5 wt %, a content of the third mixed inorganic particles is between 4 wt % and 8 wt %, and a content of the water is between 71.8 wt % and 76.8 wt %.

### Claim 2 (depends on 1)

The coated pearl paper according to claim 1, wherein the third resin is graft-modified by using monomers that include the following components, and a sum of the following components is 100 wt %: (a) 90 wt % to 95 wt % of a (meth)acrylate having an alkyl group; (b) 4 wt % to 9 wt % of a (meth)acrylate having a hydroxyl group; and (c) 1 wt % to 5 wt % of a vinyl monomer having a carboxyl group.

### Claim 3 (depends on 1)

The coated pearl paper according to claim 1, wherein, in the third mixed inorganic particles, based on the total weight of the coating liquid being 100 wt %, a content of the calcium carbonate is between 0.5 wt % and 7 wt %, a content of the silicon dioxide is between 0.5 wt % and 6 wt %, and a content of the titanium dioxide is between 0.5 wt % and 2 wt %.

### Claim 4 (depends on 1)

The coated pearl paper according to claim 1, wherein the coating liquid further includes an additive, and the additive is at least one of an auxiliary agent, a catalyst, or a co-solvent; wherein, based on the total weight of the coating liquid being 100 wt %, a content of the additive is between 0.5 wt % and 1 wt %.

### Claim 5 (depends on 1)

The coated pearl paper according to claim 1, wherein, based on a total weight of the major layer being 100 wt %, a content of the first resin is between 85 wt % and 95 wt %, and a content of the first mixed inorganic particles is between 5 wt % and 15 wt %; wherein, based on a total weight of each of the minor layers being 100 wt %, a content of the second resin is between 85 wt % and 95 wt %, and a content of the second mixed inorganic particles is between 5 wt % and 15 wt %; wherein a content of the calcium carbonate or a content of the silicon dioxide is greater than a content of the titanium dioxide in the major layer, and the content of the titanium dioxide is greater than the content of the silicon dioxide in each of the minor layers.

### Claim 6 (depends on 1)

The coated pearl paper according to claim 1, wherein the coated pearl paper has a light transmittance of between 20.5% and 20.8% and a haze of between 98.1% and 98.8%.

### Claim 7

A method for producing a coated pearl paper, comprising:
a pearl paper forming process implemented by co-extruding polypropylene, calcium carbonate, silicon dioxide, and titanium dioxide through an extruder to form a pearl paper, wherein the pearl paper includes a major layer and two minor layers arranged at two sides of the major layer, the major layer includes a first resin and a plurality of first mixed inorganic particles, the first resin includes polypropylene, the first mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide, each of the minor layers includes a second resin and a plurality of second mixed inorganic particles, the second resin includes polypropylene, and the second mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide; and
a coating process implemented by coating a coating liquid onto the pearl paper to form a coating layer on one of the minor layers of the pearl paper and form the coated pearl paper, wherein the coating liquid includes a third resin, a plurality of third mixed inorganic particles, and water; wherein the third resin is an acrylate graft-modified polyurethane resin, and the third mixed inorganic particles include calcium carbonate, silicon dioxide, and titanium dioxide; wherein, based on a total weight of the coating liquid being 100 wt %, a content of the third resin is between 18.5 wt % and 21.5 wt %, a content of the third mixed inorganic particles is between 4 wt % and 8 wt %, and a content of the water is between 71.8 wt % and 76.8 wt %.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the third resin is graft-modified by using monomers that include the following components, and a sum of the following components is 100 wt %: (a) 90 wt % to 95 wt % of a (meth)acrylate having an alkyl group; (b) 4 wt % to 9 wt % of a (meth)acrylate having a hydroxyl group; and (c) 1 wt % to 5 wt % of a vinyl monomer having a carboxyl group.

### Claim 9 (depends on 7)

The method according to claim 7, wherein, in the third mixed inorganic particles, based on a total weight of the coating liquid being 100 wt %, a content of the calcium carbonate is between 0.5 wt % and 7 wt %, a content of the silicon dioxide is between 0.5 wt % and 6 wt %, and a content of the titanium dioxide is between 0.5 wt % and 2 wt %.

### Claim 10 (depends on 7)

The method according to claim 7, wherein the coating liquid further includes an additive, and the additive is at least one of an auxiliary agent, a catalyst, or a co-solvent; wherein, based on the total weight of the coating liquid being 100 wt %, a content of the additive is between 0.5 wt % and 1 wt %.

### Claim 11 (depends on 7)

The method according to claim 7, wherein based on a total weight of the major layer being 100 wt %, a content of the first resin is between 85 wt % and 95 wt %, and a content of the first mixed inorganic particles is between 5 wt % and 15 wt %; wherein based on a total weight of each of the minor layers being 100 wt %, a content of the second resin is between 85 wt % and 95 wt %, and a content of the second mixed inorganic particles is between 5 wt % and 15 wt %; wherein, a content of the calcium carbonate or a content of the silicon dioxide is greater than a content of the titanium dioxide in the major layer, and the content of titanium dioxide is greater than the content of silicon dioxide in each of the minor layers.

### Claim 12 (depends on 7)

The method according to claim 7, wherein the coated pearl paper has a light transmittance of between 20.5% and 20.8%, and a haze of between 98.1% and 98.8%.