JPS606741A - Vinyl chloride resin composition - Google Patents

Abstract

PURPOSE:To enhance the volume resistivity of a vinyl chloride resin by scavenging metal ions, metallic compounds, etc., contained in the resin by adding a small amount of a copolymer of dicyclopentadiene with maleic anhydride to the resin. CONSTITUTION:The purpose vinyl chloride resin composition is obtained by mixing 99.995-95wt% vinyl chloride resin such as a vinyl chloride homopolymer or a copolymer of vinyl chloride with a monomer copolymerizable therewith (e.g., ethylene or acrylic acid) with 0.005-5wt% copolymer of dicyclopentadiene with maleic anhydride. The MW of the latter component is preferably about 1,000-20,000 because of practicality, the copolymerization ratio of maleic anhydride to dicyclopentadiene is preferably about 1-2/1 by mole, and its acid value is preferably 100 or below.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a composition with improved volume resistivity (hereinafter abbreviated as VR).

PVC has been a plastic with a high volume resistivity and has been used as an electrical insulating material since the beginning of the 7th century, but trace amounts of metal ions and metal compounds with a relatively high tendency to ionize are mixed in during the manufacturing and processing processes of PVC. , which causes a decrease in 5vR. In reality, it is extremely difficult to completely prevent the contamination of these metal ions.

The present inventors have intensively investigated a method for improving the VR of PVC by capturing the metal ions and eliminating their influence. It was discovered that the VR of the obtained PvC composition was improved by adding a specific amount of -M copolymer), and the present invention was achieved.

The present invention uses a D-M copolymer with pva α005~5
This is a PVC composition with a large VR, characterized by adding % by weight.

In the present invention, pva refers to not only vinyl chloride homopolymers but also monomers copolymerizable with vinyl chloride, such as ethylene, propylene, vinyl acetate, vinyl propionate, acrylic acid, and acrylic esters.

Contains vinyl ethers, copolymers of vinyl chloride with various other known copolymerizable monomers, and graft copolymers mainly composed of vinyl chloride, which can be used for suspension polymerization, emulsion polymerization,
Those obtained by any known polymerization method such as bulk polymerization or gas phase polymerization may be used.

Although the molecular weight of the D-M copolymer used in the present invention is not particularly limited, it is practically 1000 to 200.
A value of about 00 is preferable. The copolymerization ratio of dicyclopentadiene maleic anhydride in the DM copolymer is 1 to 2 mol of maleic anhydride per 1 mol of dicyclopentadiene, and the acid value is preferably 100 or more.

The DM copolymer can be obtained by placing dicyclopentadiene, maleic anhydride, a solvent, and a catalyst in a reactor, heating it while stirring, and separating the solvent and unreacted materials after the reaction is completed.

The larger the amount of the D-M copolymer added, the greater the VR improvement effect, but if it exceeds a weight ratio of 5 to 'pvc, it is not practical because the influence on other physical properties becomes large. Also, a005
If the weight is less than -, almost no VR improvement effect is observed.

D-M copolymer may be added to PVO at the end of 9 polymerizations before PVC polymerization or at the time of molding, but adding it during polymerization is more effective in improving VR at the same amount than during molding. There is a tendency for there to be a large

P V OiCT)-M copolymer is added and plasticizers, lubricants, and stabilizers 2 are added in accordance with conventional methods during molding.
Add colorants, etc., mix uniformly, and extrude.

Molded using calender rolls, injection molding machines, etc.

Next, the composition of the present invention will be explained in more detail with reference to examples.

Example 1 a 6-30001t of pure water in the reactor9. 2000 kg of vinyl chloride monomer, butyl peroxyneodecanate n, 6 and 9. Water-soluble polyvinyl alcohol 1.6
IC9 was added and heated to 57° C. with stirring. Polymerization was carried out until the pressure decreased by tOkg/cl, approximately 80
The conversion rate of H was obtained.

100 parts of the obtained product, 50 parts of DOP, and 5 parts of tribasic lead sulfate were mixed and kneaded for 10 minutes using rolls heated to 7.150°C, and then pressed for 5 minutes at 170°C to give a mixture of about 1. Q
A sheet having a thickness of v+m was created.

The VR of this sheet was measured in accordance with JIS-6723 and used as data for comparison.

b Molecular weight 5 oco, acid value 250 (7) DM copolymer was added with Q, 005 per vinyl chloride monomer before the start of polymerization.
The same procedure as a was carried out except that the weight percent was added.

The same procedure as a was carried out except that 0.05 wt % of the D-M copolymer described in cb was added per vinyl chloride monomer before the start of polymerization.

The same procedure as a was carried out except that 0.05% by weight of the DM copolymer described in db was added at the end of the polymerization based on the vinyl chloride monomer.

The DM copolymer was obtained by placing dicyclopentadiene, maleic anhydride, a solvent, and a catalyst in a reactor and heating while stirring, and after the reaction was completed, the solvent and unreacted materials were separated.

The VR measurement results of Example 1 are shown in Table-1.

Table-1 Example 2 a Bomo PVC with a degree of polymerization of 1000 obtained by suspension polymerization method
After mixing 100 parts of DOP, 5 parts of DOP, and 5 parts of tribasic lead sulfate and kneading for 10 minutes with a roll heated to 150°C,
A sheet having a thickness of about 1.0 fin was prepared by pressing at 170° C. for 5 minutes. VR of this sheet to JIS-, 6723
The data was measured using a method similar to that of the above and used as data for comparison.

b The same procedure as a was carried out except that a DM copolymer having a molecular weight of 20,000 and an acid value of 250 was added in the proportions shown in Table 2.

The DM copolymer was obtained by the following procedure.

The VR measurement results of Example 2 are shown in Table-2.

Table-?

Claims (1)

[Claims] (1) Copolymer of vinyl chloride resin 99.995-95%], dicyclopencdiene, and maleic anhydride 00
A vinyl chloride resin composition comprising 0.05 to 5% by weight.