JPS5893736A - Resin composition - Google Patents

Abstract

PURPOSE:To provide a resin compsn. which can improve impact resistance without deteriorating its rigidity when added to a thermoplastic resin, by mixing an inorg. filler with a thermoplastic elastomer. CONSTITUTION:25-90wt% thermoplastic elastomer such as ethylene/propylene rubber and 75-10wt% inorg. filler having an average particle size of 0.1-0.8mu such as colloidal calcium carbonate are kneaded together in a Banbury mixer to obtain the desired resin compsn. A pref. amount of said resin compsn. to be added to a thermoplastic resin such as polyethylene or polymethyl methacrylate is 20-70wt%.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin composition, and more particularly to a resin composition used to improve the impact resistance of a thermoplastic resin without reducing its rigidity.

Thermoplastic resins, such as polyethylene, polypropylene, polymethyl methacrylate, polycarbonate, MuB8 resin, and polystyrene, each have excellent material properties, but compared to metal materials, they have poor impact resistance, especially notch resistance at low temperatures. Impact strength is low. Therefore, the scope of use of thermoplastic resins is limited.

In order to improve these drawbacks, attempts have been made to add elastomers to thermoplastic resins or to use elastomers and calcium carbonate in combination.

However, even if these substances are added, sufficient effects may not be obtained or there may be disadvantages such as a decrease in rigidity, and it has not been possible to simultaneously improve the rigidity and impact resistance of the matrix resin.

The present invention provides an additive resin composition for obtaining a thermoplastic resin composition free from such drawbacks.

The present invention is a resin composition comprising a thermoplastic elastomer having a weight of 25 to 90 and an inorganic filler having an average particle size of L11 to L18H and a weight of 75 to 10.

In the present invention, examples of thermoplastic elastomers include ethylene propylene rubber (KPB) and ethylene propylene diene rubber (zppM)! ' can be used arbitrarily.

Furthermore, the inorganic filler is not particularly limited, but colloidal calcium carbonate is particularly preferred.

As described above, the blending ratio of the thermoplastic elastomer and the inorganic filler is 25-90% by weight for the former and 75-10% by weight for the latter. In blending the elastomer and the inorganic filler, if the amount of elastomer is below 25 weight plates, uniform crosstalk is difficult and deterioration due to heat generation is serious. Further, even if such a composition is added, sufficient improvement in impact resistance cannot be obtained. On the other hand, if the elastomer is added to a composition with a weight of 90% or more, the rigidity cannot be sufficiently improved, and the objective of the present invention (Ma) is that both the rigidity and impact resistance of IJ lux resin Improvements cannot be made.

Both components are kneaded using a Banbury mixer or other kneading means to obtain the resin composition of the present invention.

This resin composition can be molded into pellets or other shapes if necessary.

The resin composition of the present invention improves the impact resistance of thermoplastic resins obtained from polyethylene, polypropylene, polymethyl methacrylate, polycarbonate, and styrene without reducing the rigidity of the resin. used for. The amount of the resin composition of the present invention added to the thermoplastic resin depends on the type of the resin.

It may be determined as appropriate considering the purpose of use, etc., but usually 2
It is appropriate that the amount of elastomer in the blending ratio is 10 to 30% by weight, and the ratio of the inorganic filler to the elastomer is α5 to Z5. By adding the resin composition of the present invention, the impact strength of the thermoplastic resin can be improved without reducing the rigidity of the thermoplastic resin. Therefore, especially when producing various molded products using L-lyolefin as a material, products with excellent impact resistance can be obtained, and the field of use of thermoplastic resins can be significantly expanded.

Next, examples of the present invention will be shown.

Examples and comparative examples Non-grade ethylene-propylene copolymer (1 μml).

Propylene content 27 weight Ls, melt index a
a V1o min) *ft ethylene, propylene, diene copolymer (PDM, propylene content: 28% by weight).

A resin composition of 1541 m was prepared by kneading colloidal calcium carbonate with a Mooney viscosity of 70) and an average particle size of 115 μm in a Banbury mixer. Table 1 shows the blending ratio of each composition.

For comparison, resin compositions of type S were prepared by kneading the above sample No. 11 with calcium carbonate having an average particle diameter of t7μ, talc having a diameter of 4μ, or glass beads having a diameter of 40μ. Table 2 shows the blending ratio of this composition.

A thermoplastic resin composition was prepared by adding a predetermined amount of the above composition to homoglyph propylene, block polypropylene, high density polyethylene and polyethylene, and the physical properties thereof were measured. The results are shown in Table-3.

・1 M8゛ Pilgrimage D256 Compliant with the M law ■: Yu Misaki 112
Compliant with MST MD7?0■ Two-shoulder 5 Ethylene Propylene Rubber 114 Calcium carbonate with particle size Lap 5 Colloidal calcium carbonate with average particle size α15μ Representative of Idemitsu Petrochemical Co., Ltd. Person Patent Attorney Kubo 1) Fuji Department Procedural Amendment (Voluntary) July 11, 1960 Commissioner of the Patent Office Shima 1) Haruki / Indication of Case Patent Application Showa S Otsu-7930 O / Co Title of Invention Resin Composition 3 Relationship with the case of the person making the amendment Patent applicant Idemitsu Petrochemical Co., Ltd. Agent Address: No. 70 S, Kyobashi, Chuo-ku, Tokyo 104 Column for detailed explanation of the invention in the specification subject to amendment Contents (1) Table 3 on page 6 of the specification is as follows: D”17C
) i do.

(2) The footnote of Table 3 on page 7/line S is corrected as follows.

i * l Based on ASTM D 256 A method (unit: Ky-cm 7cm 2) 2 ASTM
Compliant with D 790 (unit: K11 / crn2) car 3
Ethylene-propylene rubber book 4 Calcium carbonate with a particle size of 17μ*5 Colloidal calcium carbonate with an average particle size of 0.15μ*6
Based on JIS K-7211 (Unit: Ky・c
m) j(3) Add the following sentence next to the footnote of Table 3 on page 7.

“As can be seen by comparing Example/ and Comparative Example λ, although the EPR ratio of the final composition is equal to 7 wt%, Example/ using composition A of the present invention has a higher It has significantly superior impact properties at low temperatures and in terms of rigidity.

In addition, when the composition of the present invention is added to block polypropylene, it has excellent low-temperature impact properties as shown in Example C.
Moreover, it is possible to provide a material suitable for use as a material for a gentle automobile hamper having a bending rigidity of /0.000 Ky 7 cm2 or more.

Furthermore, when this composition is added to polystyrene, which is one of the seven styrene-based resins, as shown in Example B, it not only has excellent low-temperature isostatic impact and flexural modulus, but is also considered to be close to practical impact. It is possible to provide a material that is excellent in the impact of falling balls.

In addition, comparative example/2. /3. /11. /,! ;.

/ As shown in Figure B, simply combining an elastomer and an inorganic filler has no effect on the impact surface, and only the blended composition of an inorganic filler and an elastomer presented in the present invention is specific and effective in the present invention. I can tell the gender. "(that's all)

Claims (1)

[Claims] (thermoplastic elastomer) v-25 to 90% by weight and 75 to 10% by weight of an inorganic filler having an average particle size of α1 to α8μ.