JPS59164345A - Resin composition containing ultrafine silicic acid powder - Google Patents

Abstract

PURPOSE:To provide the titled compsn. having excellent light-diffusing ability and moldability, by incorporating a specified ultrafine silicic acid powder. CONSTITUTION:0.3-3.0phr of ultrafine silicic acid powder having an average particle size of 1-20mu, oil absorption of 30-70ml/100g and a sedimentation volume of 8-13ml/5g is blended with a thermoplastic resin such as PVC.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composition in which ultrafine powdered silicic acid having special powder characteristics is used in combination with thermoplastics, and the main purpose is to improve moldability and to improve transparent plastics. Even more so in the case of .

This is to impart light diffusivity. Conventionally, for this purpose, calcium carbonate (Japanese Patent Application Laid-Open No. 155245/1983) or a combination of calcium carbonate and aluminum hydroxide (Japanese Patent Application Laid-Open No. 1983-155245) have been used.
No. 162743) etc. are known facts.

However, these materials merely have light diffusing properties.

The ultrafine powdered silicic acid used in the present invention not only has poor light diffusivity, but also has the effect of improving moldability, and is also economically advantageous. Therefore, the present invention was completed.

In the present invention, ultrafine powdered silicic acid Cj and colloidal silica (Snowtex (trade name); Nissan Chemical Industries, Ltd.) are completely dried and produced by (1).

Furthermore, there are also those whose surface has been treated with other plastics, etc.

Of course, it is applicable. This N
d! 7'100! More than 7? 60 to 7 o
It is characterized by a small sedimentation volume of 8 to 1 mL, 57, compared to the former's 20 to 80 mL, 57. These numerical values indicate the surface condition and shape of the fine powdered silicic acid, but in conclusion, they all mean that the powder is relatively spherical with few voids. Furthermore, it is characterized by a very sharp particle size distribution with an average particle diameter of 1 to 20 μm, and it is presumed that this combination of grinding produces a divine effect. In addition, the physical properties of the above-mentioned average particle size of 1 to 20μ, oil absorption power of 50-70"/I00S', sedimentation I.l volume IN'1 of 8 to 2000m, /5Si' When powdered silicic acid is used, for reasons that are not clear, defects appear in optical Vt'J!6. such as light diffusivity, scattered light permittivity, and parallel light transmittance.

The amount of this ultrafinely agitated silicic acid added to the thermoplastic plastic is preferably 0.3 to 5.0 phr. The year is 0
．． If the amount is less than 5 phr, the effect of improving molding processability and the effect of imparting light diffusivity will be produced and will be poor.

on the other hand,? If the amount exceeds +phr, disadvantages such as adverse effects on the quality of one machine and complete loss of transparency will become stronger.

9 In the case of imparting light diffusivity in the present invention.

The types of thermoplastic plastics are limited to those that have transparency, but the single class of plastics used for these purposes include polyvinyl vinyl, borisdylene,
Examples include homopolymers such as poly(meth)acrylic acid ester, --1 polycarbonate, polyester, and EBOKI 71, or copolymer resins with other components.

In this case, the shape of the molded product can be applied not only to films and sorting by extrusion or calendar molding, but also to various shapes by injection molding, blow molding, injection, molding, etc. be.

Hereinafter, the present invention will be explained in detail in the implementation ρ().
The following evaluation method was used to measure the physical property values.

(1) Optical and scientific properties: Meat made by roll and press methods
9.2 mm sample 'lr-AEITM-D-1003
Measurements were made according to.

(2) Light diffusivity: expressed as the distance #t at which the shape of a 20W fluorescent lamp becomes invisible.

(Melt viscosity; high (using a flow desk).

Load: j50KF/, orifice: i mtnφx t [] mm, / A total of 1 orifice was used for measurement.

■Average particle size; Coal-coup counter method ■Oil absorption amount;

Example-1 and Comparative Example-1 Salt f-hibinyl resin 11 NVC (average degree of absorption f 700)
Te, tin-based stabilizer (N-200(17)2) per 100 parts
1 part, 3 parts of stearyl alcohol (Calcol 16) and various fillers according to Table 1.

The mixture was thoroughly stirred and mixed for 6 minutes on a roll with a surface temperature of 160°C to produce a roll 7-1 with a wall thickness of about 5 mm.

Next, this roll 7-t was cut into a fixed size.

The sheets were stacked in a spacer and pressed for 6 minutes in a press set at 180°C to form a press plate with a box thickness of 2 mm. The light diffusivity and optical properties of the press plate molded here are determined by JLLJ, and the &0 results are shown in Table 1.
However, the ν chewy composition of the present invention not only has light diffusing properties but also has a large value of total light transmittance (Tt), and is good for the eyes.
'14 is proving effective.

On the other hand, the filler with )1] in the comparative example exhibits light diffusing properties (1(
If the total light transmittance (Tt) is 7° or more,
Below and a small [direct (~ or could not be shown.

374 Real Noi N<++-2 and Comparative Example-2 Borisdylene P S (melt flow rate; 751i
// 10 minutes) For 100 parts, add various ingredients to 1 degree.
2) and kneaded with a roll at 100° C. in the same manner as in Example 1 to produce a sheet metal. Using this Roll Geetler, press at 180℃ to 7JO pressure molding l ~ wall thickness 2
A press plate of mm in diameter was prepared, and its light diffusivity and optical properties were measured in the same manner as in Example-1. The results are shown in Table 2.9 The composition of the present invention not only had a large value of total light penetration rate (Tt).

Has light diffusing properties. However, the composition of the comparative example could not satisfy these performance requirements.

Example-3 and Comparative Example-3 To 100 parts of PVO (Pm2O3), tin-based stabilizer (
Add 2 parts of N-2000K), 0.3 FL of stearyl alcohol (Calcol S 6) and various fillers according to Table 6, mix with a roll at 160°C for 3 minutes, then crush and measure the melt viscosity. The melt viscosity was as shown in Table 6, and both of the two compositions of the present invention had a lower melt viscosity of 1.411! than the system without a filler, and were easier to process.

On the other hand, in all of the comparative examples, the improvement effect was that of the composition of the present invention.
It didn't reach the bell.

Letter of amendment 1981 11” Isg mouth Mr. Kazuo Wakasugi, Commissioner of the Patent Office 1 Display of incident 1981 Patent Application No.: 38627 2 Name of the invention Resin composition containing ultrafine powdered silicic acid 3? ili person who corrects 4 Target of correction Detailed description of the invention in the specification 5 Contents of amendment “　Corrected to (190°C, 'c, p,)J.

Claims (1)

[Claims] Average particle size is 1~20μ, oil absorbing needle is 30~70"100"
S', sedimentation volume of 8-15 debris 52 super () 1 sentence powder silicic acid 03-3. Containing Ophr is a Q♀ symptom. Thermoplastic composition.