# US 9,433,972 B2 · Coated paper having a coating structure with controlled distribution of latex and method for preparing the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,433,972 B2
- Document ID: US9433972B2
- Status: Granted
- Kind: B2
- Application number: 14/581,557
- Filed: 2014-12-23
- Published: 2015-04-23
- Granted: 2016-09-06
- Earliest claimed: 2011-01-07
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Seung-Uk Yeu; Chang-Sun Han; Young-Min Lee; Byoung-Yun Kim
- Web page: https://patentgrep.com/patent/US9433972B2

## CPC

- B05D 3/0254: {After-treatment}
- B05D 1/26: performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
- B05D 1/28: performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
- B05D 1/36: Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D 1/38: with intermediate treatment (intermediate treatment per se B05D3/00)
- B05D 5/00: Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D 7/52: {Two layers}
- B05D 7/54: {No clear coat specified}
- B05D 7/544: {the first layer is let to dry at least partially before applying the second layer}
- B05D 7/546: {each layer being cured, at least partially, separately}
- D21H 19/20: comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H 19/82: superposed {(D21H19/84 takes precedence)}
- D21H 21/50: characterised by form (D21H19/66, D21H21/42, D21H27/02 take precedence)
- D21H 23/56: Rolls (D21H23/38 takes precedence)
- H04N 21/222: Secondary servers, e.g. proxy server, cable television Head-end {(provisioning of proxy services in data packet switching networks H04L67/56)}
- H04N 21/2407: {Monitoring of transmitted content, e.g. distribution time, number of downloads (arrangements for monitoring programmes for broadcast or for distribution combined with broadcast H04H20/14)}
- H04N 21/2665: Gathering content from different sources, e.g. Internet and satellite
- H04N 21/4316: {for displaying supplemental content in a region of the screen, e.g. an advertisement in a separate window}
- H04N 21/4622: {Retrieving content or additional data from different sources, e.g. from a broadcast channel and the Internet (web site content organization and management for information retrieval from the Internet G06F16/958; transmission by internet of broadcast information H04H60/82; stock exchange data over packet-switching network H04L12/1804; push services including data channel over packet-switching network H04L12/1859)}
- H04N 21/4722: for requesting additional data associated with the content
- H04N 21/8173: {End-user applications, e.g. Web browser, game}
- B05D 2203/00: Other substrates
- Y10T 428/24942: including components having same physical characteristic in differing degree
- Y10T 428/2495: Thickness [relative or absolute]
- Y10T 428/25: Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T 428/254: Polymeric or resinous material
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- 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
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed is coated paper having a coating structure in which styrene-butadiene latex distribution of a paper coating layer is controlled in order to reduce fold cracking of the coated paper and a method for manufacturing the same. The coated paper in which different types of latexes are separately applied to two coating layers exhibits considerably improved stiffness and reduced fold crack, as compared to the existing coated paper.

## Claims

### Claim 1

A method for preparing coated paper comprising:
preparing a first coating solution comprising a latex having a particle size of 70 to 120 nm and a glass transition temperature of 10 to 30° C. and a second coating solution comprising a latex having a particle size of 120 to 200 nm and a glass transition temperature of −30 to 0° C.;
coating a base paper with the first coating solution, followed by drying, to form a first coating layer as a pre-coating layer; and
coating the first coating layer with the second coating solution, followed by drying, to form a second coating layer as a top coating layer,
wherein a total thickness of the coating layers of the first coating layer and the second coating layer is within the range of 20 to 60 μm.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the first coating solution or the second coating solution is prepared by mixing 5 to 20 parts by weight of a styrene-butadiene latex and 0.1 to 9 parts by weight of a thickener, with respect to 100 parts by weight of the pigment and the auxiliary pigment, to have a solid content of 60 to 75% and pH of 8 to 11.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the base paper is a base paper for art paper, a base paper for art board paper, or a base paper for cardboard, each having a basis weight of 70 to 350 g/M2.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the coating layer is formed using a super calendar or a soft-nip calendar.