Method of preparing vinyl chloride resin having high impact strength and low die swell

• US 6,344,532 B1
• Filed: 07/18/2000
• Issued: 02/05/2002
• Est. Priority Date: 11/20/1998
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Lee, Kyung-Woo, Kim, Kyung-Hyun, Kim, Hyun-Deuk
• Primary Examiner(s): HENDERSON JR, CHRISTOPHER A
• Application Number:
  US09/600,529
• Time in Patent Office: 567 Days
• Field of Search: 526/89, 526/201, 526/194, 526/344, 525/579
• US Class Current: 526/344
• CPC Class Codes: C08F 14/06 Vinyl chloride
• CPC Class Codes: C08F 2/44 Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
• CPC Class Codes: C08F 259/04 on to polymers of vinyl chloride
• CPC Class Codes: C08F 283/12 on to polysiloxanes

Abstract

A method of preparing vinyl chloride resin is provided. In the method, a first vinyl chloride monomer is mixed with a first initiator to prepare a seed polymer particle and a second vinyl chloride monomer and a second initiator are added to the polymerized seed polymer particle. An organic siloxane polymer is added to the first monomer and/or second monomer of Formula (1), wherein R₁ is hydrocarbon having 1 to 12 carbon atoms and substituted with a group selected from the group consisting of hydrogen, alkyl, haloalkyl, aryl, haloaryl, aralkyl, polyether, imino, epoxy and vinyl; R₂ is saturated hydrocarbon having 1 to 12 carbon atoms; and n is an integer of 10 to 12,000.

Claims

1. A method of preparing vinyl chloride resin having good impact strength comprising the steps of:

mixing a first vinyl chloride monomer with a first initiator to prepare a seed polymer particle;

adding a second vinyl chloride monomer, a second initiator and an organic siloxane polymer to the polymerized seed polymer particle

wherein R₁ is hydrocarbon having 1 to 12 carbon atoms and substituted with a group selected from the group consisting of hydrogen, alkyl, haloalkyl, aryl, haloaryl, aralkyl, polyether, imino, epoxy and vinyl;

R₂ is saturated hydrocarbon having 1 to 12 carbon atoms; and

n is an integer of 10 to 12,000.

2. The method of claim 1 wherein the organic siloxane polymer has 20 to 100,000 Cst of viscosity.

3. The method of claim 1 wherein the amount of organic siloxane polymer is 0.01 to 20 weight percent.

4. The method of claim 1 wherein the first polymer further includes organic siloxane polymer.

5. A method of preparing vinyl chloride resin having good impact strength comprising the steps of:

mixing a first vinyl chloride, a first initiator and an organic siloxane polymer of formula 1 to prepare a first polymer;

adding a second vinyl chloride and a second intiator to the first polymer

wherein R1 is hydrocarbon having 1 to 12 carbon atoms and substituted with a group selected from the group consisting of hydrogen, alkyl, haloalkyl, aryl, haloaryl, aralkyl, polyether, imino, epoxy and vinyl;

R₂ is saturated hydrocarbon having 1 to 12 carbon atoms; and

n is an integer of 10 to 12,000.

6. The method of claim 5 wherein the organic siloxane polymer has 20 to 100,000 Cst of viscosity.

7. The method of claim 5 wherein the amount of organic siloxane polymer is 0.01 to 20 weight percent.

8. The method of claim 5 wherein the second polymerization step further includes organic siloxane polymer.