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Process of manufacturing a heat-resistant composite sheet
| Details |
Inventors: Ishige, Yoshiki; Kinugasa, Toshiyuki; Ando, Yoshio; Sato, Shoji;
Assignee: Honda Giken Kogyo Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Van Balen; William J.
Assistant Examiner:
Attorney, Agent or Firm: Haseltine, Lake & Waters
A process for manufacturing a heat-resistant composite sheet comprising applying a bonding agent with an added cross-linking agent on one of the facing surfaces to be adhered of a thermoplastic resin sheet and a polyolefin foam sheet. The two sheets are then placed one upon another through the bonding agent coated layer and are bonded together while heating the same and applying pressure thereto. |
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DETAILED DESCRIPTION A polypropylene foam sheet 1 of about 4 mm thickness, and a polyvinyl chloride type leather sheet 3 of about 0.
5 mm thickness are taken as the materials to be laminated one upon another, and the surface to be adhered of the foam sheet 1 is coated with a bonding agent consisting of a hot-melting type adhesive agent of the polyester type or polyurethane type or the like containing a cross-linking agent, such as an isocyanate type, whereby a thin coating layer 2 thereof is formed on the surface.
After the coating layer 2 is dried, the foam sheet 1 is heated to temperature in the range of from 190 to 220.
degree.
C.
The polyvinyl chloride sheet 3 previously heated to above 160.
degree.
C.
is put on this heated foam sheet surface, and these are passed through a pair of upper and lower pressing rolls 4, 4 as illustrated and thereby the two are pressed against each other and are bonded.
During this time, the bonding agent completes its cross-linking action, and thus there can be obtained a composite sheet wherein the two sheets are bonded together by the cross-linkage connection.
When this composite sheet was subjected to a bonding strength test, the polypropylene foam sheet resisted to the tensile force and the foam sheet itself was broken.
Further, when this composite sheet, after repeated heating several times at about 105.
degree.
C.
for eight hours, was subjected to the test in almost the same manner as above, the rupturing of the polypropylene foam sheet itself again occured.
Thus, it was demonstrated that the heat-resistance and bonding force of the bonding layer 2 between the boundary surfaces of the two sheets were extremely high and excellent.
Thus, according to this invention, at least one of the polyolefin foam sheet and the thermoplastic resin sheet is coated with a coating layer of a hot-melting type bonding agent containing a cross-linking agent, and the two are then placed together and are heated and pressed against each other, so that there can be obtained a composite sheet having excellent heat resistant bonding characteristics
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Semiconductor manufacture 
