Processing aid for vinyl chloride resin and vinyl chloride resin composition

• US 7,432,320 B2
• Filed: 12/10/2003
• Issued: 10/07/2008
• Est. Priority Date: 08/28/1998
• Status: Expired due to Fees

• Current Assignee: Kaneka Corporation
• Original Assignee: Kaneka Corporation
• Inventors: Takaki, Akira, Miki, Yasuhiro, Sakashita, Noriko
• Primary Examiner(s): EGWIM, KELECHI CHIDI
• Application Number:
  US10/730,887
• Publication Number:
  US 20040116580A1
• Time in Patent Office: 1,763 Days
• Field of Search: 524/458, 524/523, 524/527, 525/85, 525/80, 525/227, 525/239
• US Class Current: 524/458
• CPC Class Codes: C08F 265/06 Polymerisation of acrylate or methacrylate esters on to polymers thereof
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 2666/24 Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
• CPC Class Codes: C08L 27/06 Homopolymers or copolymers of vinyl chloride
• CPC Class Codes: C08L 51/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C08L51/04, C08L51/06 take precedence

Abstract

There is provided a vinyl chloride resin composition, which is excellent in processability and can produce a processed article having excellent physical property or a formed molding having excellent property. A processing aid having specific viscosity of at least 0.5 is combined with a vinyl chloride resin, wherein the aid is obtained by polymerizing 1 to 50 parts by weight of a monomer mixture (B) comprising 0 to 49% by weight of methyl methacrylate, 51 to 100% by weight of at least one monomer selected from the group consisting of a methacrylate ester except methyl methacrylate and an acrylate ester, and 0 to 20% by weight of a vinyl monomer copolymerizable therewith, in the presence of a latex of a (co)polymer having specific viscosity of at least η_sp 0.7, which is obtained by polymerizing in emulsion 99 to 50 parts by weight of a monomer mixture (A) comprising 51 to 100% by weight of methyl methacrylate, 0 to 49% by weight of at least one monomer selected from the group consisting of a methacrylate ester except methyl methacrylate and an acrylate ester, and 0 to 20% by weight of a vinyl monomer copolymerizable therewith, wherein the total amount of (A) and (B) is 100 parts by weight.

Claims

1. A processing aid for a vinyl chloride resin;

the processing aid having a specific viscosity η

_sp of 0.6-1.6, an average particle diameter of 1500-3000 Å and

being obtained by polymerizing

1 to 50 parts by weight of a monomer mixture (B) comprising 0 to 49% by weight of methyl methacrylate,

51 to 100% by weight of at least one monomer selected from the group consisting of a methacrylate ester except methyl methacrylate and an acrylate ester, and

0 to 20 % by weight of a vinyl monomer copolymerizable therewith,

in the presence of a latex of a (co)polymer having specific viscosity of at least η

_sp 0.7, which is obtained by polymerizing in emulsion 99 to 50 parts by weight of a monomer mixture (A) comprising

51 to 100% by weight of methyl methacrylate,

0 to 49 % by weight of at least one monomer selected from the group consisting of a methacrylate ester except methyl methacrylate and an acrylate ester, and

0 to 20 % by weight of a vinyl monomer copolymerizable therewith, the total amount of (A) and (B) being 100 parts by weight, and the specific viscosities being measured at 30°

C. using Ubbelohde'"'"'s Viscometer on 0.1 g of polymer dissolved in 100 mL chloroform.

2. The processing aid of claim 1, wherein the processing aid for a vinyl chloride resin is a processing aid for a vinyl chloride resin containing a foaming agent.

3. A vinyl chloride resin composition comprising 100 parts by weight of a vinyl chloride resin and 0.1 to 30 parts by weight of the processing aid of claim 1.

4. A vinyl chloride resin composition containing a foaming agent comprising 100 parts by weight of a vinyl chloride resin, 0.1 to 30 parts by weight of the processing aid of claim 1 and a foaming agent.