Shock absorbing material

• US 4,783,366 A
• Filed: 06/27/1986
• Issued: 11/08/1988
• Est. Priority Date: 10/30/1984
• Status: Expired due to Fees

• Current Assignee: Aisin Kako KABushiki Kaisha, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Aisin Kako KABushiki Kaisha, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Sano, Osamu, Kito, Osamu, Fujikawa, Atsunobu, Shibata, Haruzi, Susuki, Haruhisa, Shimogo, Kenzo, Torii, Hiroshi
• Primary Examiner(s): Ives, P. C.
• Application Number:
  US06/882,940
• Time in Patent Office: 865 Days
• Field of Search: 428/327, 428/484, 428/463, 428/497, 428/465, 428/492, 428/467, 428/315.9, 428/315.5, 524/271
• US Class Current: 428/315.5
• CPC Class Codes: C08L 21/00 Compositions of unspecified rubbers
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: F16F 1/3605 characterised by their material F16F1/362, F16F1/364, F16F1/366, F16F1/37 take precedence; composition of macromolecular compounds in general C08L
• CPC Class Codes: F16F 9/306 of the constrained layer type, i.e. comprising one or more constrained viscoelastic layers
• CPC Class Codes: Y10T 428/249978 Voids specified as micro
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/31699 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31707 Next to natural rubber
• CPC Class Codes: Y10T 428/31714 Next to natural gum, natural oil, rosin, lac or wax
• CPC Class Codes: Y10T 428/31801 Of wax or waxy material
• CPC Class Codes: Y10T 428/31826 Of natural rubber
• CPC Class Codes: Y10T 428/31844 Of natural gum, rosin, natural oil or lac

Abstract

This invention concerns a shock absorbing material placed between two objects for buffering the shocks, and a method of applying the same.

Heretofore, a previously formed shock absorbing material is bonded by way of an adhesive or the like to an object to be buffered. However, there has been a disadvantage that no desired bonding strength can be obtained or the adhesive is degraded. It is intended in this invention to render the shock absorbing material fusible under heating, by which the shock absorbing material is fused due to the melting of the shock absorbing material itself with an object to be buffered using no adhesive thereby increasing the bonding area and improving the bonding strength as compared with the conventional case. This object can be attained by constituting the shock absorbing material with from 10 to 60 parts by weight of a polymeric viscous material, from 10 to 50 parts by weight of a softening agent, from 10 to 60 parts by weight of a tackifier and from 0 to 65 parts by weight of elastomeric particles. Further, by the use of the shock absorbing material of the composition, since the shock absorbing material is liquefied under heating and can be handled as a fluid, the material can directly be coated and, simultaneously, applied to an object to be buffered by using a nozzle or the like.

Claims

1. A thermoplastic shock absorbing material placed between two objects for buffering impact shocks, wherein the shock absorbing material is joined to at least one surface of the two objects by fusion thereto, and which consists essentially of:

(a) from about 10-60 parts by weight of one or more uncured viscous polymeric materials selected from the group consisting of styrene-butadiene rubber, butyl rubber, nitrile rubber, chloroprene rubber, natural rubber, and a diene block polymer;

(b) from about 10-50 parts by weight of one or more softening agents selected from the group consisting of vegetable oil, fatty oil, petroleum oil, coal tar and synthetic resins; and

(c) from about 10-60 parts by weight of one or more tackifiers selected from the group consisting of xylene resin, phenol resin, cumarone resin, hydrogenated rosin ester, terpene resin, polyisobutylene and polymeric was.

2. A shock absorbing material as claimed in claim 1, wherein said shock absorbing material is placed between the surface of a vehicle body and the surface of a fuel tank.

3. The shock absorbing material as claimed in claim 1, which further comprises up to about 65 parts by weight of cured elastomeric particles, thereby increasing the elasticity modulus of the shock absorbing material.

4. The shock absorbing material as claimed in claim 3, wherein said elastomeric particles are particles of a vulcanized powdered rubber selected from the group consisting of natural rubber, nitrile rubber, butyl rubber and styrene-butadiene rubber.

5. The shock absorbing material as claimed in claim 3, wherein said elastomeric particles are powdered vulcanized rubber of from 0.1 to 3 mm particle size.

6. The shock absorbing material as claimed in claim 1, wherein said elastomeric particles have a hollow or porous structure having inner space.

7. The shock absorbing material as claimed in claim 3, wherein said tackifier has a softening point from 80°

to 130°

C.