Vinyl chloride resin composition

• US 5,093,420 A
• Filed: 04/09/1990
• Issued: 03/03/1992
• Est. Priority Date: 04/12/1989
• Status: Expired due to Term

• Current Assignee: Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
• Original Assignee: Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
• Inventors: Matsuba, Kuniyoshi, Hosoi, Hideki, Hasegawa, Toshihiko
• Primary Examiner(s): Marquis, Melvyn I.
• Assistant Examiner(s): BUTTNER, DAVID J
• Application Number:
  US07/506,130
• Time in Patent Office: 694 Days
• Field of Search: 525/85, 525/80
• US Class Current: 525/85
• 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

A vinyl chloride resin composition including: (1) 100 parts by weight of a vinyl chloride resin and (2) 0.1 to 30 parts by weight of a two-stage polymer, said polymer (2) being prepared by emulsion-polymerizing 60 to 95 parts by weight of a monomer mixture (A) of 50 to 95% by weight of methyl methacrylate, 5 to 50% by weight of an alkyl methacrylate with a C₂ to C₈ alkyl group and 0 to 20% by weight of a vinyl monomer to give a polymer latex and then polymerizing 40 to 5 parts by weight of a monomer mixture (B) of 20 to 80% by weight of an alkyl acrylate and/or an alkyl methacrylate other than methyl methacrylate, 80 to 20% by weight of methyl methacrylate and 0 to 20% by weight of a vinyl monomer in the presence of said polymer latex, said polymer (2) having a particle size of not more than 1000 Å in the latex, and a specific viscosity at 30° C. of the solution wherein 0.4 g of said polymer (2) is dissolved in 100 ml of benzene of 1 or more. The composition is excellent in transparency and secondary processability as well as in processability. Thus, a composition having excellent properties can be prepared by admixing a small amount, such as 0.1 to 30 parts by weight of the two-stage polymer as the agent for improving the processability with 100 parts by weight of the vinyl chloride resin.

Claims

1. A vinyl chloride resin composition comprising:

(1) 100 parts by weight of a vinyl chloride resin and

(2) 0.1 to 30 parts by weight of a two-stage polymer, said polymer (2) being prepared by emulsion-polymerizing 60 to 95 parts by weight of a monomer mixture (A) of 50 to 95% by weight of methyl methacrylate, 5 to 50% by weight of an alkyl methacrylate with a C₂ to C₈ alkyl group and 0 to 20% by weight of a vinyl monomer copolymerizable therewith to give a polymer latex and then polymerizing 40 to 5 parts by weight of a monomer mixture (B) of 20 to 80% by weight of at least one monomer selected from the group consisting of an alkyl acrylate and an alkyl methacrylate other than methyl methacrylate, 80 to 20% by weight of methyl methacrylate and 0 to 20% by weight of a vinyl monomer copolymerizable therewith in the presence of said polymer latex, the total amount of said monomer mixture (A) and said monomer mixture (B) being 100 parts by weight;

said polymer (2) having a particle size of not more than 1000 Å

in the latex, and a specific viscosity at 30°

C. of the solution wherein 0.4 g of said polymer (2) is dissolved in 100 ml of benzene of 2 or more.

2. The composition of claim 1, wherein said particle size of said polymer (2) in the latex is not more than 800 Å

.

3. The composition of claim 1, wherein said alkyl methacrylate with C₂ to C₈ alkyl group in said monomer mixture (A) is butyl methacrylate.