# US 12,214,091 B2 · Super absorbent resin and preparation method thereof

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- Number: US 12,214,091 B2
- Document ID: US12214091B2
- Status: Granted
- Kind: B2
- Application number: 17/254,560
- Filed: 2018-06-22
- Published: 2021-09-02
- Granted: 2025-02-04
- Earliest claimed: 2018-06-22
- Assignees: Shandong Haoyue New Materials Co., Ltd
- Applicants: Shandong Haoyue New Materials Co., Ltd
- Inventors: Zhiliang Yang; Hao Yang; Yanyu Ma; Yang Yang; Xiang Zhang; Meiqin Yao; Jinshui Yao
- Web page: https://patentgrep.com/patent/US12214091B2

## CPC

- A61L 15/24: Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof {(A61L15/225 takes precedence)}
- A61L 15/42: Use of materials characterised by their function or physical properties (liquid bandages A61L26/00)
- A61L 15/60: Liquid-swellable gel-forming materials, e.g. super-absorbents
- B01J 20/267: {Cross-linked polymers}
- C08J 3/075: Macromolecular gels
- C08J 3/245: {Differential crosslinking of one polymer with one crosslinking type, e.g. surface crosslinking}
- A61L 2400/04: Materials for stopping bleeding
- B01J 2220/4812: the starting material being of organic character
- B01J 2220/68: Superabsorbents
- C08J 2333/02: Homopolymers or copolymers of acids; Metal or ammonium salts thereof
- C08L 33/02: Homopolymers or copolymers of acids; Metal or ammonium salts thereof
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The present invention relates to a sodium polyacrylate super absorbent resin for blood absorption with a gradual hierarchical structure. When a blood simulant solution is used as the detection medium, according to ISO 19699-1:2017(E), the absorption capacity of the blood simulant solution is ≥18.0 g/g, Preferably ≥18.5 g/g; the absorption rate of the blood simulant solution is ≤45 s, preferably ≤40 s, more preferably ≤38 s; when human blood is used as the detection medium, according to ISO 19699-1:2017(E), the absorption capacity of the human blood is ≥8.0 g/g, preferably ≥8.3 g/g, more preferably ≥8.6 g/g; the absorption rate of the human blood is ≤45 s, preferably ≤40 s, more preferably ≤35 s, most preferably ≤25 s. The present invention combines organic cross-linking and inorganic cross-linking for surface modification, so that the resin has a gradual hierarchical structure, thereby ensuring that it has excellent blood absorption properties, while also having excellent water absorption properties and gel strength, and other performance.

## Claims

### Claim 1

A super absorbent resin having an absorption capacity of a blood simulant solution when the blood stimulant solution is used as a detection medium of greater than or equal to 18.0 g/g, according to ISO 19699-1:2017 (E), with an absorption rate of the blood simulant solution of less than or equal to 45 seconds.

### Claim 2

A super absorbent resin having an absorption capacity of human blood when the human blood is used as a detection medium of greater than or equal to 8.0 g/g, according to ISO 19699-1:2017 (E), with an absorption rate of the human blood of less than or equal to 45 seconds.

### Claim 3 (depends on 2)

The super absorbent resin according to claim 2 having an absorption capacity of a blood simulant solution when the blood stimulant solution is used as a detection medium of greater than or equal to 18.0 g/g, according to ISO 19699-1:2017 (E), with an absorption rate of the blood simulant solution of less than or equal to 45 seconds.

### Claim 4 (depends on 1)

The super absorbent resin according to claim 1, wherein the super absorbent resins has a residual monomer content of ≤1000 mg/kg, calculated as acrylic acid; a volatile content of ≤10.0%; a pH value of 5.0-8.0; a particle size distribution wherein a proportion of particles with a size of <150 μm is ≤5 wt %, and a proportion of particles with a size of <106 μm is ≤1 wt %; a bulk density of 0.65 g/cm3-0.80 g/cm3; a whiteness of ≥70%, or any combination thereof.

### Claim 5 (depends on 1)

The super absorbent resin according to claim 1, wherein the super absorbent resin comprises surface modified sodium polyacrylate resin.

### Claim 6 (depends on 5)

The super absorbent resin according to claim 5, wherein the super absorbent resin is surface modified by surface crosslinking using a solution A comprising a polyvalent metal salt, and using a solution B that is prepared from compounds containing epoxy groups and solvents.