Crosslinking control in high impact polystyrene manufacturing process

Patent metadata

Field	Value
Publication number	US-9593186-B2
Application number	US-201514881476-A
Country	US
Kind code	B2
Filing date	Oct 13, 2015
Priority date	Mar 14, 2014
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

The method includes providing a high impact polystyrene (HIPS) reaction system, wherein the HIPS reaction system has a devolitalizer downstream of a reactor and injecting a retarding agent into the HIPS reaction system prior to the devolitalizer.

First claim

What is claimed is:

1. A method comprising:
providing a high impact polystyrene (HIPS) reaction system, wherein the HIPS reaction system has a devolitalizer downstream of a reactor;
adding a retarding agent to a polymer melt in the HIPS reaction system prior to the devolitalizer, wherein the retarding agent is a crosslinking coagent.

2. The method of claim 1 , wherein the crosslinking coagent is a polyfunctional (meth)acrylic monomer.

3. The method of claim 1 , wherein the swell index of the HIPS 15 to 25 over that when no retarding agent is used.

4. The method of claim 1 , wherein the concentration of the retarding agent in the polymer melt prior to the devolitalizer is between 1 ppm and 1% (by weight).

5. The method of claim 4 , wherein the concentration of the retarding agent in the polymer melt prior to the devolitalizer is between 50 and 1000 ppm (by weight).

6. The method of claim 4 , wherein the concentration of the retarding agent in the polymer melt prior to the devolitalizer is between 50 and 150 ppm (by weight).

7. The method of claim 1 , wherein the retarding agent is added to the HIPS reaction system when the polymer melt has reached a conversion of 70 to 75%.

8. The method of claim 1 , wherein the crosslinking coagent is an allylic compound.

9. The method of claim 1 , wherein the crosslinking coagent is a metal salt of an unsaturated monocarboxylic acid.

Assignees

• Fina Technology

Inventors

• Wang Wei
• Knoeppel David
• Bluhm Madison

Classifications

• C08F112/08 Primary

  Styrene · CPC title

• C08F2/38 Primary

  Polymerisation using regulators, e.g. chain terminating agents {, e.g. telomerisation} · CPC title

• C08F2/40

  using retarding agents · CPC title

• C08F279/02

  on to polymers of conjugated dienes · CPC title

• C08J3/24

  Crosslinking, e.g. vulcanising, of macromolecules (mechanical aspects B29C35/00; crosslinking agents C08K) · CPC title