# US 9,434,833 B2 · Bulk PVC composition, bulk PVC polymerization method and apparatus

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

- Number: US 9,434,833 B2
- Document ID: US9434833B2
- Status: Granted
- Kind: B2
- Application number: 14/774,052
- Filed: 2014-09-30
- Published: 2016-01-21
- Granted: 2016-09-06
- Earliest claimed: 2013-09-30
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Dong Kwon Lee; Kwang Hyon Kim; Bo Hee Park; Se Woong Lee; Jin Hyuck Ju
- Web page: https://patentgrep.com/patent/US9434833B2

## CPC

- C08K 5/053: Polyhydroxylic alcohols
- B01J 19/24: Stationary reactors without moving elements inside (B01J19/08, B01J19/26 take precedence; with stationary particles B01J8/02)
- C08F 2/01: characterised by special features of the polymerisation apparatus used
- C08F 2/02: Polymerisation in bulk
- C08F 2/44: Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
- C08F 14/06: Vinyl chloride
- C08F 114/06: Vinyl chloride
- B01J 2219/24: Stationary reactors without moving elements inside
- C08K 5/05: Alcohols; Metal alcoholates
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Disclosed are a bulk PVC composition and a bulk PVC polymerization method using the same. According to the present invention, a bulk PVC composition that may effectively prevent generation of fine particles and scale (adhering to a reactor wall) during bulk polymerization and may be prepared without a post-treatment process of an antistatic agent added to easily isolate fine particles after bulk PVC polymerization, and a method and apparatus for polymerizing the same may be provided.

## Claims

### Claim 1

A bulk PVC composition comprising a vinyl chloride monomer, an initiator and a bulk PVC particle coating agent,
wherein the PVC particle coating agent is a hydrocarbon alcohol having two to four hydroxyl groups, and
wherein the hydrocarbon alcohol having two to four hydroxyl groups is one or more selected from ethylene glycol, diethylene glycol, propylene glycol, hexamethylene glycol, propanetriol, trimethylolpropane and pentaerythritol.

### Claim 2 (depends on 1)

The bulk PVC composition according to claim 1, wherein the PVC particle coating agent is propanetriol.

### Claim 3 (depends on 1)

The bulk PVC composition according to claim 1, wherein the bulk PVC particle coating agent is a coating material input to an inner wall of a post-polymerization reactor and an agitator before transferring a seed polymer generated through pre-polymerization.

### Claim 4 (depends on 1)

The bulk PVC composition according to claim 1, wherein an amount of the bulk PVC particle coating agent is 50 to 300 ppm with respect to 100 parts by weight of a vinyl chloride monomer.

### Claim 5 (depends on 1)

The bulk PVC composition according to claim 1, wherein the vinyl chloride monomer is only a vinyl chloride monomer or a mixture of a monomer copolymerizable with the vinyl chloride monomer, wherein the monomer copolymerizable with the vinyl chloride monomer is one or more selected from vinyl esters, aromatic vinyl compounds, acylic acids, monoolefins and vinylidene halides.

### Claim 6 (depends on 1)

The bulk PVC composition according to claim 1, wherein the initiator is one or more selected from 3-hydroxy-1,1-dimethylbutylperoxyneodecanoate, cumyl peroxyneodecanoate, 1,1,3,3-tetramethylbutyl peroxyneodecanoate, cumyl peroxyneoheptanoate, t-amylperoxy neodecanoate, t-butylperoxy neodecanoate and t-butylperoxy neoheptanoate.

### Claim 7 (depends on 1)

The bulk PVC composition according to claim 1, wherein the initiator is comprised in an amount of 0.01 to 0.1 parts by weight with respect to 100 parts by weight of the vinyl chloride monomer.

### Claim 8

A bulk PVC polymerization method, wherein the bulk PVC polymerization is performed such that a distribution ratio of fine particles having sizes of 70 μm or less is less than 2.5%.

### Claim 9 (depends on 8)

The method according to claim 8, wherein the distribution ratio of fine particles having sizes of 70 μm or less is less than 2.0%, and a distribution ratio of fine particles having sizes of 20 μm or less is less than 1.0%.

### Claim 10 (depends on 8)

The method according to claim 8, wherein, in the bulk polymerization, bulk-polymerizing a vinyl chloride monomer in a presence of a initiator through pre-polymerization; inputting a particle coating agent to a post-polymerization reactor before transferring a seed polymer generated through pre-polymerization; and polymerizing PVC in a post-polymerization reactor into which the particle coating agent is input are sequentially performed.