Method for preparing graft copolymer powder
US-2021292538-A1 · Sep 23, 2021 · US
Graft copolymer and method for preparing same
US12398263B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12398263-B2 |
| Application number | US-202017618790-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 23, 2020 |
| Priority date | Nov 25, 2019 |
| Publication date | Aug 26, 2025 |
| Grant date | Aug 26, 2025 |
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- Title
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- Abstract
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Abstract
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The present invention relates to a graft copolymer and a method for preparing the same, wherein the graft copolymer has merits of a superior storage convenience compared to existing dry powder and a high whiteness index, and thus may be widely applied to various fields.
First claim
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The invention claimed is: 1. A method for preparing a graft copolymer pellet formed of a graft copolymer, the method comprising: (S1) polymerizing a conjugate diene-based polymer or an acrylate-based polymer with one or more among a vinylcyan-based monomer and an aromatic vinyl-based monomer to obtain a reaction product including a graft copolymer; and (S2) forming the reaction product in the form of a pellet through an extruder, wherein the reaction product comprises a dispersion medium including water, and wherein the extruder includes a barrel, a screw mounted inside the barrel, a ventilation part for discharging steam, and a heater part for heating the barrel, a hopper is coupled to one side of the barrel, and a discharge port for discharging the reaction product is on another side of the barrel, the screw has a plurality of forward zones alternating with a plurality of kneading zones, and the forward zones have forward direction threads, and the kneading zones have neutral-type threads or reverse direction threads. 2. The method of claim 1 , wherein the pellet has a bulk density of 450 kg/m 3 to 700 kg/m 3 . 3. The method of claim 1 , comprising (S-1) adjusting a percentage of water content to be less than 30% before step S2, wherein the extruder comprises a side ventilation part. 4. The method of claim 1 , comprising (S1-2) adjusting a percentage of water content to be 30% to 60% before step S2, wherein the extruder comprises two or more side slots.
Assignees
Inventors
Classifications
used for thermoforming · CPC title
Powdering or granulating · CPC title
- C08F279/04Primary
Vinyl aromatic monomers and nitriles as the only monomers · CPC title
on to polymers of esters · CPC title
characterised by the choice of material · CPC title
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Frequently asked questions
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- What does patent US12398263B2 cover?
- The present invention relates to a graft copolymer and a method for preparing the same, wherein the graft copolymer has merits of a superior storage convenience compared to existing dry powder and a high whiteness index, and thus may be widely applied to various fields.
- Who is the assignee on this patent?
- Lg Chemical Ltd
- What technology area does this patent fall under?
- Primary CPC classification C08F279/04. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Aug 26 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).