Tire with reduced cavity noise

Abstract

Disclosed is a tire with reduced cavity noise including an adhesive agent layer applied to an inside of an inner liner and a sound absorber layer attached to the adhesive agent layer, wherein the adhesive agent layer includes poly(ether-urethane) containing alkoxysilane at both ends thereof. The tire with reduced cavity noise is stable without causing separation of a sound absorber even upon heating and deformation during driving.

Claims

1. A tire with reduced cavity noise comprising: an adhesive agent layer applied to an inside of an inner liner; and a sound absorber layer attached to the adhesive agent layer, wherein the adhesive agent layer comprises a poly(ether-urethane) containing alkoxysilane at both ends thereof, wherein a sound absorber of the sound absorber layer comprises a polyurethane foam with open cells, and wherein the poly(ether-urethane) containing alkoxysilane at both ends thereof is represented by the following Formula 1a: ##STR00009## wherein R.sub.1 to R.sub.3 each independently represent a C1 to C3 alkyl or alkoxy group and n is an integer of 1 to 10,000.

2. The tire according to claim 1, wherein the alkoxysilane is any one selected from the group consisting of mono-alkoxysilane, di-alkoxysilane and tri-alkoxysilane.

3. The tire according to claim 1, wherein the alkoxysilane is any one selected from the group consisting of methoxysilane, ethoxysilane and propoxysilane.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The above and other objects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

(2) FIG. 1 is a side sectional view of a pneumatic tire according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

(3) Hereinafter, the present disclosure will be described in more detail.

(4) The tire with reduced cavity noise according to an embodiment of the present disclosure includes an adhesive agent layer applied to an inside of an inner liner and a sound absorber layer attached to the adhesive agent layer, wherein the adhesive agent layer includes poly(ether-urethane) containing alkoxysilane at both ends thereof.

(5) The side sectional view of the pneumatic tire according to an embodiment of the present disclosure is shown in FIG. 1. Referring to FIG. 1, the pneumatic tire 1 according to the present disclosure includes an adhesive agent layer 2 applied to an inside surface of an inner liner and a sound absorber layer 3 attached to the adhesive agent layer 2.

(6) The poly(ether-urethane) containing alkoxysilane at both ends thereof included in the adhesive agent layer 2 may be represented by the following Formula 1.

(7) ##STR00004##

(8) Wherein R.sub.1 to R.sub.3 each independently represent a C1 to C3 alkyl or alkoxy group, and n is an integer of 1 to 1,000.

(9) The ether repeat unit may be oxypropylene represented by the following Formula 2 and the urethane repeat unit may be represented by the following Formula 3.

(10) ##STR00005##

(11) The polymer of Formula 1 is composed of poly(ether-urethane), not polyether, as a main chain, so that it has enough strength to endure external force while maintaining constant elasticity.

(12) The polymer of Formula 1 contains an alkoxysilane group as a functional group at both ends thereof, so that crosslinkage can be created between the polymers to improve adhesive strength.

(13) The alkoxysilane may be mono-alkoxysilane, di-alkoxysilane, or tri-alkoxysilane.

(14) The alkoxysilane may contain a C1 to C3 alkoxy group and be preferably any one selected from the group consisting of methoxysilane, ethoxysilane and propoxysilane.

(15) For example, the alkoxysilane is any one selected from the group consisting of methyldimethoxysilane, methyldiethoxysilane, methyldipropoxysilane, methyldibutoxysilane, ethyldimethoxysilane, ethyldiethoxysilane, ethyldipropoxysilane, ethyldibutoxysilane, propyldimethoxysilane, propyldiethoxysilane, propyldipropoxysilane, propyldibutoxysilane, butyldimethoxysilane, butyldiethoxysilane, butyldipropoxysilane, butyldibutoxysilane, dimethylmethoxysilane, dimethylethoxysilane, dimethylpropoxysilane, dimethylbutoxysilane, diethylmethoxysilane, diethylethoxysilane, diethylpropoxysilane, diethylbutoxysilane, dipropylmethoxysilane, dipropylethoxysilane, dipropylpropoxysilane, dipropylbutoxysilane, dibutylmethoxysilane, dibutylethoxysilane, dibutylpropoxysilane, dibutylbutoxysilane, methylethylmethoxysilane, methylpropylmethoxysilane, methylbutylmethoxysilane, methylethylethoxysilane, methylpropylethoxysilane, methylbutylethoxysilane, methylethylpropoxysilane, methylpropylpropoxysilane, methylbutylpropoxysilane, methylethylbutoxysilane, methylpropylbutoxysilane, methylbutylbutoxysilane, trimethoxysilane, triethoxysilane, and tripropoxysilane, but the present disclosure is not limited thereto.

(16) The compound of Formula 1 is more specifically represented by the following Formula 1a.

(17) ##STR00006##

(18) Wherein R.sub.1 to R.sub.3 each independently represent a C1 to C3 alkyl or alkoxy group, and n is an integer of 1 to 1,000.

(19) The adhesive agent composition containing a poly(ether-urethane) polymer containing alkoxysilane at both ends thereof can maintain the performance of reducing cavity sound until the end of the abrasion lifespan of tires without detachment, separation or removal of sound absorbers even upon deformation by vehicle load or exterior shock or under high temperature as well as low temperature.

(20) The sound absorber layer 3 preferably includes a polyurethane foam as a sound absorber.

(21) The polyurethane foam is basically produced by urethane reaction of a polyisocyanate compound and a polyol (polyhydroxy) compound.

(22) The polyurethane foam refers to a sound absorber which is based on polyurethane having open cells and may have a density of 25 to 35 kg/m.sup.3.

(23) The polyurethane foam having open cells is disadvantageously difficult to adhere to an inner liner because an adhesive agent having low viscosity is excessively absorbed in the polyurethane foam. However, since a silicone adhesive agent is absorbed only on the surface of open cells due to high viscosity and elasticity, it secures durability against high deformation without causing deterioration in adhesive strength, thus being suitable for adhesion of a polyurethane foam.

(24) Hereinafter, embodiments of the present disclosure will be described in more detail such that a person having ordinary knowledge in the field to which the present disclosure pertains can easily implement the embodiments. However, the embodiments of the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein.

(25) [Production Example: Preparation of Adhesive Agent Composition]

(26) An adhesive agent composition was prepared using the composition shown in the following Table 1.

(27) TABLE-US-00001 TABLE 1 Comparative Example 1 Example 1 Main Polyether polymer Poly(ether-urethane) polymer chain Functional Methyldimethoxysilane Methyldimethoxysilane group Formula n = 1 n = 1

Test Example 1

Evaluation of Adhesive Strength

(28) The adhesive agent compositions prepared in Examples and Comparative Examples mentioned above were applied to an inner liner and a sound absorber for tires, followed by adhesion. Physical properties of the resulting structures were measured and are shown in Table 2.

(29) TABLE-US-00002 TABLE 2 Comparative Items Properties Example 1 Example 1 Tensile Hardness 25 40 properties 100% modulus 9.2 18.4 Elongation 490 400 Evaluation of Peel Test 25.4 42 adhesive strength

(30) As can be seen from Table 2, Example 1, wherein a poly(ether-urethane) polymer is included as a main chain and an end is modified, exhibits improved hardness and modulus, as well as more improved adhesive strength.

(31) Example 1 exhibits lower elongation (strain) than Comparative Example 1, which means that Example 1 has a potential to prevent detachment of the sound absorber.

(32) The adhesive agent composition according to the present disclosure can endure deformation and heat generation of tires through improved elasticity and adhesive strength.

(33) The tire manufactured using the adhesive agent composition according to the present disclosure can reduce cavity sound, which is tire noise generated by air vibration in the tire, by attaching a sound absorber layer using the adhesive agent composition with strong tenacity.

(34) The tire according to the present disclosure can maintain the performance of reducing cavity sound until the end of the abrasion lifespan of the tire without detachment or removal of a sound absorber even upon variation in temperature of the tire and deformation by vehicle load or exterior shock during driving, by attaching the sound absorber using the adhesive agent layer with strong tenacity.

(35) Although the preferred embodiments of the present disclosure have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.