JPS5844701B2 - Polypentenamer materials - Google Patents

Description

Detailed Description of the Invention The present invention provides a high molecular weight polypen bunamer having a Mooney viscosity (MLl+4 (100°C)) of 100 or more, 95 to 50% by weight, and a liquid low molecular weight polypen bunamer of 5 to 50% by weight.
% by weight.

A mixture of 95 to 0 weight % of a high molecular weight polypen bunamer having a Mooney viscosity of 140 or more and 5 to 30 weight % of a liquid low molecular weight polypen bunamer is preferred.

It is well known in the art that polypenbunamer is produced by ring-opening polymerization of cyclopentene using an organometallic flux containing tungsten or molybdenum.

Also, from an industrial perspective, it is particularly preferred to use trans-polypenbunamers, in which at least 50% of the double bonds are in the trans form and have rubber-like properties.

Regarding the appropriate molecular weight of trans-polypenbunamer, in other words, the appropriate Mooney viscosity, considering the high filling properties of carbon black, oil, etc., green strength, exothermic properties, etc., Mooney viscosity (ML, +4 (100 ° C.)) has a Mooney viscosity of 100 or more, preferably 140 or more.

However, when the Mooney viscosity reaches 140 or higher,
Although the green strength of polypenbunamer formulations is much higher than that of natural rubber, it has low tack and rolls poorly.

At the same time, fillers such as carbon black and oil and various additives are also difficult to mix.

Furthermore, the tackiness of the formulation containing fillers etc. is low, and
Shrinkage after calendering and extrusion is large, resulting in poor moldability.

In order to improve adhesion, generally, as an adhesive,
Although a resin is added, this adhesive has no effect in the case of high molecular weight polypen-tenamers and is not suitable at all since it reduces the vulcanizate properties.

We have developed a high molecular weight polypenbunamer, 95-50
It has been found that a mixture of 5% to 50% by weight of a low molecular weight polypen bunamer has excellent rollability, excellent tack, green strength, and low shrinkage after molding.

At the same time, they have found that by incorporating a low molecular weight polypenbunamer, the deterioration of the physical properties of the vulcanizate is not ignored, but surprisingly, the tear strength is also improved.

As described above, high molecular weight polypenbunamer has very high green strength, but has poor roll processability and adhesiveness, and also has large shrinkage after molding.

However, these drawbacks can be decisively improved by incorporating even a low molecular weight polypenbunamer in an amount of 5 to 15% by weight.

The high molecular weight polypene anamer used in the present invention has a Mooney viscosity of 100 or more, and the low molecular weight polypene anamer is selected from those having a molecular weight of several hundred to several thousand.

Moreover, the trans isomer content Q is 50% or more for both the high molecular weight polypentenamer and the low molecular weight polypentenamer.

Furthermore, from the present invention, as will be easily understood by those skilled in the art, the mixing ratio of the high molecular weight polypene anamer and the low molecular weight polypene anamer remains the same, and this two-component system Rubber (natural rubber, polyisoprene,
By mixing polybutadiene, styrene-butadiene rubber (selected from ethylene/propylene rubber) in any proportion, various properties such as green strength and heat aging resistance can be improved.

To improve the processability of high molecular weight polypene anamers (this,
- Even if an attempt is made to add extender oil (oil), which is thought to have the same effect as low molecular weight polypene anamers, during the processing process, the oil is kicked out and does not mix at all.

Therefore, the effect of adding this low molecular weight polypene anamer is surprising, since the processability is not improved at all.

The mixture of the present invention can be prepared by mixing in conventional rubber processing equipment or by mixing two rubber solutions in an organic solvent obtained from a polymerization process and then removing the solvent to separate the rubbers. It can also be manufactured by

Mixing these is very easy and the mixture is homogeneous.

The blended unvulcanized product containing fillers and the like has excellent tackiness and green strength, so it can be used as rubber for automobile tires and other industrial products.

Examples of the present invention are given below.

Example 1 As a high molecular weight polypene anamer, Mooney viscosity (ML
(1000C)) is 150 or more and 1+4 (ML, 133 at +4 (130°C)), a liquid polypene anamer with a molecular weight of 4,500 is used as a low molecular weight polypene anamer, first a high molecular weight polypene anamer is added by a roll mill, and then a high molecular weight polypene anamer is added. A liquid polypene anamer was prepared as a blended mixture shown in Table 1.

Table 1 High molecular weight polypentenamer - 100 to 50 parts Low molecular weight polypentenamer 0 to 50 parts Carbon black (I
SAF) 50 parts naphthenic oil
10 parts zinc oxide 3 parts stearic acid 3 parts phenylisopropylphenylene diamine 1 part phenyl-
α-Naphthylamine 1 part Tsukusela CZ
O, 6 parts sulfur
1.8 parts green strength is JISK63
01-71, the tensile strength of the raw material mixture (ky/cf
fl).

The blended mixture was vulcanized by pressing at 1500 C for the proper vulcanization time (approximately 30 minutes) obtained by an oscillating rheometer.

Vulcanized physical properties were measured according to JIS K6301-7H.

The heat generation characteristics were measured using a Gutdrich flexometer.
Measured according to ASTM-P623-67.

The results are shown in Table 2.

Claims (1)

[Claims] 1 Mooney viscosity (ML) + 4 (1000C) high molecular weight trans-polyhentenamer of 100 or more, 95-85
Weight% and liquid low molecular weight transpolypene bunamer
A rubber composition containing 5 to 15% by weight.