JPH0220406A - Radial tire of cap-base construction - Google Patents

Abstract

PURPOSE:To obtain a radial tire having excellent low temperature characteristic by using a cap-tread made from a rubber composite containing filler of which mean primary particle diameter is over 40mmu as a main filler component. CONSTITUTION:Rubber of 100 parts, filler of various parts, naphthene oil of various parts, flowers of zinc of 3 parts, stearic acid of 2 parts, antioxidant (Santoflex 13) of 1 part, paraffin wax of 1 part, vulcanization accelerator (CBS) of 1.4 parts, and sulfur of 2 part are sufficiently kneaded for 4 minutes with a Banbury mixer for obtaining a rubber composite for a cap-tread. A cap-base construction radial tire with a size of 165/70SR13 can be obtained in the usual method, using this rubber composite for a cap-tread. The radial tire of cap-base construction is excellent in both properties, steering stability on the icebound road and braking property on the frozen road, and also has a long life by abrasion resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention is applicable not only to general paved roads but also to special 1. ″: Suitable for icy roads and snowy roads, and -) relates to long-life radial tires.

(Prior Art) Conventionally, when driving on icy roads, it has generally been possible to use so-called bike tires in which spike bins are driven into the tire tread. However, in recent years, road surface damage caused by spiked tires and the resulting dust generation, floating,
Furthermore, noise has become a major social problem. For this reason, there has been a strong demand for radial tires, including so-called studless tires, which do not require spike bins even on icy roads.

However, in general, studless tires do not exhibit long-lasting performance if some grooves remain on the tread surface. For this reason, tires are often used as general tires when the treads are worn and the grooves become shallow during the initial running period, but at that point the wear resistance is usually poor.

(Problems to be Solved by the Invention) An object of the present invention is to provide a radial tire that has improved low-temperature characteristics and has excellent wear resistance even at the point 7 when the tread wears out and the grooves become shallow in the later stages of dotting. It is in.

(Means for Solving the Problems) The present invention has a 2M structure in which the tread rubber has a tread rubber on the surface of the tread, and a base rubber on the part in contact with the belt.
In a new tire, the filler component is mainly composed of a filler having an average particle size of 40 mμ or more. The present invention relates to a tire having a cap-filled structure characterized by the following.

It is common sense to use rubber with good abrasion resistance for the gap part of the conventional cap base Shakushinzo for the shell, and to use rubber with low heat generation for the pace part. The present invention (411, cap part 5k l-1) Even though it sacrifices some abrasion resistance, we deliberately use rubber with excellent water resistance, and the base part is made of rubber with excellent abrasion resistance. It uses sticky rubber and is based on a completely new idea not found in 1j!1 US.

I as a rubber component of the tread of the tire of the present invention
L human rubber (NR) 1, butanoenim (13iz),
When using styrene rubber (SBR)% inbrene rubber (IR) and blends thereof, the amount of snalene in the rubber IAE content is 1. f
:I want it to be less than 20% serious.

The present invention provides a rubber composition for capts 1 to 1 with a 1L
The main filler component is a filler having a particle size of 40 μm or more (40 μm/meter, Group C). 72 and 1.1 are used as the main filling M components, and are used as bulking agents. 22 Shiga 11
．． Therefore, in the present invention, as a result of extensive research conducted in consideration of the relationship with the polymers used in rubber I & M, the above-mentioned filler of 40 + μ or more is used as the main filler component. We succeeded in obtaining an L-fusial tire with excellent low-temperature characteristics.

Examples of the above-mentioned filler used in the present invention include carbon black, silicic acid, magnesium silicate, aluminum silicate, calcium carbonate, calcium sulfate, barium sulfate, phosphorus oxide, etc. C, the average of these fillers - large particles fP1. t4 has μ or more 1r, preferably 40-5000 mμ, particularly preferably lJ: 60
= 2000 mμ range. Invention C is a combination of a part of the filler with a particle size of 40 mμ or more, preferably a filler with a particle size of 40 mμ or less in a range of about 50% by weight or less.
-7 is also fine. The filler is preferably used in an amount of about 40 to 120 parts by weight per 100 parts by weight of the rubber component.

The tire of the present invention is produced by kneading the above-mentioned ingredients in a processing device with 31 seats, for example, 0-1, Banbury', 2-Gourly, 1), etc. The resulting rubber composition can be used in the l'' part of a luxury rubber shoe to produce it by a conventional method.I'--The above ingredients can be combined with a known vulcanizing agent, vulcanization 1 pair, and vulcanization 41J!-: Addition of auxiliary agents, vulcanization retarders, peroxides, reinforcing agents, plasticizers, 4-chemical anti-IL shavings, adhesive shavings, χτ color shavings, etc.
Of course.

The silk product is used as capt 1/tudrum 2
Other than ・The production of tires is carried out according to known methods.1
′, is a 7-based rubber forceps manufactured by ζ, and (′j,
Special 1.144 Excellent abrasion resistancei Also, for example, natural rubber (N
R), butanoenim (BRL)-buto-butadiene rubber (S: I3 R), isobutone: rA (I n)
etc.1. :Contains a relatively large amount of carbon grain with a high M strength of HAF or higher and a relatively small amount of oil.1. L-bum group 1
It is &7'ma17 to use things etc. Thickness IJ of N rubber: 70% or less of thickness in all grooves, preferably 50% or less of thickness (Efficacy of the invention! J1.) Radial tire of the present invention 1. Excellent/:'l low-temperature properties, - General 81i equipment 1. l: Of course, it is suitable for running on roads, and has excellent wear resistance during running contact, so it has the special feature that it is dangerous for people's lives. ( Examples) Examples and comparative examples will be fully explained and explained below. In addition, η "1 part" indicates parts by weight.

Examples and Comparative Examples NR (60 parts), B R (30 alS ), 23%, X
Chin 5BR (10 parts), N339 car, 712
7260 parts, 15 parts of Na-7 Tenyl, 3 parts of zinc white, 2 parts of stearic acid, anti-aging agent Xantho-7 Rex 13)
1 part, Balafi: ・1 part wax, vulcanization accelerator (CB
S) 1,4i11S and M'2, part b,
A base rubber composition (a) was obtained by kneading for 191 minutes in a Banbury mixer. B) 3 parts of Hana, 2 parts of steric acid, anti-aging WHf
fn) 71/Tux 13) 1 part, paraffin wax 1
1.4 parts of vulcanization accelerator (CBS) and 2 parts of sulfur flt
If!
A rubber composition for a cap tread was obtained using each of the rubber compositions for the base rubber and for the cap tread.
A full tire with a 70S R13tn cap base structure was obtained by a conventional method. was evaluated. It is expressed as an index, with the tire number as 100.

The higher the value, the better.

Table 2 (Book 1) Shows tires with a general structure without a cap.

As shown in Table 2, the noal tire with the cap base structure of the present invention is excellent in both handling stability on ice and snow roads and water braking performance, and I am worried that the tire will wear out and die. it is obvious.

(Hereinafter referred to as "Yu") To the application Toyo Rubber L Gyo Co., Ltd. Representative Mr. Ibuji 1) Mura Iwajo type, rubber compound No. 5 filler was surface activated with vinyl silane J-Tara no C -Yes.

Test Examples Listed in Table 2] The handling stability on ice and snow and the braking performance on ice of the radial tires having the cap base structure were measured by the following method. The results are shown in Table 2.

In addition, for tire symbol H, N339 carbon black is 70
The 1-triobtained rubber composition (b) was used as a base rubber composition in the same manner as the rubber #1 product (a), except that the rubber composition (b) was used as a base rubber composition.

Icy and snow road handling stability: Freezing temperatures from -5°C to -20°C 1. We drove on icy and snowy roads in the mountains or in the open mountains, and evaluated the steering stability by feeling, and evaluated it on a scale of 10 to 5 points for tires A and A. The higher the score, the better the stability.

Ice 1 - Braking performance: On ice, brake suddenly at a speed of 40 */ at 15 - and evaluate the braking performance by the distance traveled until it comes to a complete stop. The reciprocal of the braking distance is expressed as an index (the higher the number, the better).

Claims (1)

[Claims] (1) A radial tire in which the tread rubber has a two-layer structure of cap rubber on the tread surface and base rubber on the part in contact with the belt, and a rubber composition containing a filler with an average primary particle size of 40 mμ or more as the main filler component. A radial tire with a cap base structure that uses a cap tread obtained from commercially available materials.