Vinyl chloride resin composition

• US 6,221,966 B1
• Filed: 12/02/1998
• Issued: 04/24/2001
• Est. Priority Date: 12/04/1997
• Status: Expired due to Term

• Current Assignee: Kaneka Belgium N. V., Kaneka Corporation
• Original Assignee: Kaneka Belgium N.V. (Kaneka Corporation), Kaneka Corporation
• Inventors: Kadokura, Mamoru, Nakanishi, Yasushi, Janssen, Karin, Miki, Yasuhiro, Takaki, Akira
• Primary Examiner(s): HENDERSON JR, CHRISTOPHER A
• Application Number:
  US09/203,334
• Time in Patent Office: 874 Days
• Field of Search: 525/227, 525/228, 525/309, 526/329.4
• US Class Current: 525/228
• 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

A vinyl chloride resin composition having a greatly improved processability without lowering the transparency wherein the gelation property of a vinyl chloride resin is improved with greatly decreased generation of ungelled substance; which comprises a vinyl chloride resin and 0.1 to 30 parts by weight of a processing aid per 100 parts by weight of said vinyl chloride resin, wherein said processing aid is a polymer prepared by polymerizing (B) 70 to 97 parts by weight of a monomer mixture comprising 60 to 100% by weight of methyl methacrylate, 0 to 40% by weight of at least one monomer selected from the group consisting of an alkyl acrylate and an alkyl methacrylate different from methyl methacrylate and 0 to 10% by weight of other vinyl monomer copolymerizable therewith, in the presence of a latex prepared by emulsion-polymerizing (A) 3 to 30 parts by weight of a monomer mixture comprising 0 to 50% by weight of methyl methacrylate, 50 to 100% by weight of an alkyl acrylate and 0 to 20% by weight of other vinyl monomer copolymerizable therewith, the total amount of said mixtures (A) and (B) being 100 parts by weight, and said polymer has a specific viscosity of at least 1 measured at 30° C. with respect to a solution of 0.4 g of said polymer in 100 ml of benzene.

Claims

1. A vinyl chloride resin composition comprising a vinyl chloride resin and 0.1 to 30 parts by weight of a processing aid per 100 parts by weight of said vinyl chloride resin,

wherein said processing aid is a polymer prepared by polymerizing (B) 70 to 97 parts by weight of a monomer mixture comprising 60 to 100% by weight of methyl methacrylate, 0 to 40% by weight of at least one monomer selected from the group consisting of an alkyl acrylate and an alkyl methacrylate different from methyl methacrylate and 0 to 10% by weight of other vinyl monomer copolymerizable therewith, in the presence of a latex prepared by emulsion-polymerizing (A) 3 to 30 parts by weight of a monomer mixture comprising 0 to 45% by weight of methyl methacrylate, 55 to 100% by weight of an alkyl acrylate and 0 to 20% by weight of other vinyl monomer copolymerizable therewith, the total amount of said mixtures (A) and (B) being 100 parts by weight, and said polymer has a specific viscosity of at least 1 measured at 30°

C. with respect to a solution of 0.4 g of said polymer in 100 ml of benzene.

2. The composition of claim 1, wherein said polymer used as the processing aid has an average particle size of at most 1,000 Å

in the form of an aqueous latex.

3. The composition of claim 1, wherein said vinyl chloride resin is a polymer consisting of 80 to 100% by weight of units of vinyl chloride and 20 to 0% by weight of units of other monomers copolymerizable with vinyl chloride.

4. The composition of claim 1, wherein said monomer mixture (A) consists of 20 to 45% by weight of methyl methacrylate, 80 to 55% by weight of an alkyl acrylate and 0 to 20% by weight of other vinyl monomer copolymerizable therewith.

5. The composition of claim 1, wherein said alkyl acrylate in the monomer mixture (A) is an alkyl acrylate having a C₁ to C₈ alkyl group.

6. The composition of claim 1, wherein said alkyl acrylate in the monomer mixture (A) is ethyl acrylate, butyl acrylate or a mixture thereof.

7. The composition of claim 1, wherein said monomer mixture (B) consists of 60 to 90% by weight of methyl methacrylate, 40 to 10% by weight of at least one monomer selected from the group consisting of an alkyl acrylate and an alkyl methacrylate different from methyl methacrylate, and 0 to 10% by weight of other vinyl monomer copolymerizable therewith.

8. The composition of claim 1, wherein said polymer as the processing aid has a specified viscosity of at least 1.2 measured at 30°

C. with respect to a solution of 0.4 g of said polymer in 100 ml of benzene.