Reinforcing adhesive sheet

• US 4,569,880 A
• Filed: 04/19/1985
• Issued: 02/11/1986
• Est. Priority Date: 04/19/1984
• Status: Expired due to Fees

• Current Assignee: Nissan Motor Co., Ltd., Nitto Electric Industrial Co., Ltd. (Nitto Denko Corporation)
• Original Assignee: Nissan Motor Co., Ltd., Nitto Electric Industrial Co., Ltd. (Nitto Denko Corporation)
• Inventors: Yamamoto, Kazuhiko, Nishiyama, Yukio, Okada, Yukio, Sanada, Munehiko, Miura, Toshikatsu
• Primary Examiner(s): VAN BALEN, WILLIAM
• Application Number:
  US06/725,200
• Time in Patent Office: 298 Days
• Field of Search: 428/308.4, 428/188, 428/189, 428/158, 428/212, 296/188, 296/189
• US Class Current: 428/212
• CPC Class Codes: B29C 35/0272 using lost heating elements, i.e. heating means incorporated and remaining in the formed article for preforms with internal stresses B29C61/0625; joining using lost heating elements B29C65/34; making electrically conductive articles B29C70/882
• CPC Class Codes: B29C 61/065 Preforms held in a stressed condition by means of a removable support; Supports therefor
• CPC Class Codes: B29D 99/0017 with filled hollow ridges
• CPC Class Codes: B32B 2305/08 Reinforcements
• CPC Class Codes: B32B 2307/202 Conductive
• CPC Class Codes: B32B 2307/54 Yield strength; Tensile strength
• CPC Class Codes: B32B 2405/00 Adhesive articles, e.g. adhesive tapes labels B32B2519/00
• CPC Class Codes: B32B 27/065 of foam
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 3/04 characterised by at least one layer folded at the edge, e.g. over another layer ; characterised by at least one layer enveloping or enclosing a material
• CPC Class Codes: B32B 5/18 characterised by features of a layer of foamed material
• CPC Class Codes: B60J 5/0452 including foams or expanded materials
• CPC Class Codes: B60J 5/0454 being expanded onto door panel and forming a laminar structure with door panel, e.g. a rib
• CPC Class Codes: C09J 2301/204 the adhesive coating being discontinuous
• CPC Class Codes: C09J 2301/208 the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
• CPC Class Codes: C09J 2463/00 Presence of epoxy resin
• CPC Class Codes: C09J 7/10 without carriers
• CPC Class Codes: Y10T 428/24496 Foamed or cellular component
• CPC Class Codes: Y10T 428/24744 Longitudinal or transverse tubular cavity or cell
• CPC Class Codes: Y10T 428/24752 Laterally noncoextensive components
• CPC Class Codes: Y10T 428/24942 : including components having same physical characteristic in differing degree

Abstract

A reinforcing adhesive sheet comprising: a thermosetting reinforcing resin sheet containing a reinforcing material in an unhardened or semi-hardened state; and a bead-forming material provided on the thermosetting reinforcing resin sheet, the bead-forming material being narrower than the thermosetting reinforcing resin sheet and forming a bead-like projection prior to hardening the thermosetting reinforcing resin sheet, wherein the bead-forming material is a flattened material produced by flattening an elastic foamed body containing a holding agent in voids thereof, the flattened form being maintained by the holding agent, and the bead-forming material is capable of recovering its original foamed form upon heating.

Claims

1. A reinforcing adhesive sheet comprising:

a thermosetting reinforcing resin sheet containing a reinforcing material in an unhardened or semi-hardened state; and

a bead-forming material provided on the thermosetting reinforcing resin sheet, said bead-forming material being narrower than the thermosetting reinforcing resin sheet and forming a bead-like projection prior to hardening the thermosetting reinforcing resin sheet, wherein said bead-forming material is a flattened material produced by flattening an elastic foamed body containing a holding agent in voids thereof, the flattened form being maintained by the holding agent, and said bead-forming material is capable of recovering its original foamed form upon heating wherein the thermosetting reinforcing resin sheet comprises a first thermosetting reinforcing resin sheet and a second thermosetting reinforcing resin sheet, and the bead-forming material is interposed between the first and second thermosetting reinforcing resin sheets.

2. A sheet as in claim 1, wherein the tensile modulus of the first thermosetting reinforcing resin sheet after hardening by heating is greater than that of the second thermosetting reinforcing resin sheet, and the glass transition temperature of the first thermosetting reinforcing resin sheet after hardening by heating is higher than that of the second thermosetting reinforcing resin sheet.

3. A sheet as in claim 1, wherein at least the second thermosetting resin sheet is an electrically conductive sheet.

4. A reinforcing adhesive sheet as in claim 1, wherein the holding agent has a melting point or softening point in the range of from 40°

to 140°

C.

5. A reinforcing adhesive sheet as in claim 4, wherein the holding agent is a thermosetting resin selected from the group consisting of an epoxy resin, a phenol resin, and a polyester resin, or a thermoplastic resin selected from the group consisting of polyethylene, polypropylene, polyamide, and polybutyral.

6. A reinforcing adhesive sheet as in claim 1, wherein the holding agent is present in the foamed material in an amount of from about 25 to 75 wt% based on the total amount of the elastic foamed body and the holding agent.

7. A reinforcing adhesive sheet as in claim 4, wherein the holding agent is present in the foamed material in an amount of from about 25 to 75 wt% based on the total amount of the elastic foamed body and the holding agent.

8. A reinforcing adhesive sheet as in claim 5, wherein the holding agent is present in the foamed material in an amount of from about 25 to 75 wt% based on the total amount of the elastic foamed body and the holding agent.