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Crosslinked polyolefin-based resin foam sheet and process for producing the same as well as adhesive tape

a polyolefin-based resin and foam sheet technology, applied in the direction of foamed adhesives, adhesive processes, film/foil adhesives, etc., can solve the problems of high expansion ratio, insufficient flexibility of the sheet, distortion of the porous sheet, etc., to reduce the thickness of the sheet, excellent flexibility and heat resistance, the effect of reducing the thickness

Inactive Publication Date: 2008-03-06
TATEO EIJI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a crosslinked polyolefin-based resin foam sheet that has excellent flexibility and heat resistance while being thin and easy to use. The foam sheet is produced by using a polyolefin-based resin containing (40-60% by weight) of a polyethylene-based resin obtained using a metallocene compound as a polymerization catalyst. The foam sheet has a high expansion ratio and is crosslinked to prevent distortion during use. The invention also provides an adhesive tape using the crosslinked foam sheet."

Problems solved by technology

However, since it is difficult to realize a high expansion ratio of the porous sheet, the sheet has insufficient flexibility.
Further, since the porous sheet has not been subjected to crosslinking treatment, stretching treatment can not be performed at a melting point or more of a polyolefin-based resin constituting a porous sheet; therefore, there is a problem that distortion is occurred in the porous sheet during stretching treatment, and the porous sheet is shrunk during use.
However, the crosslinked ethylene-based resin foam has insufficient flexibility and heat resistance.
It is considered that the flexibility is improved by increasing an expansion ratio, but there is a problem that when the expansion ratio is increased, the resulting foam is thick.

Method used

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  • Crosslinked polyolefin-based resin foam sheet and process for producing the same as well as adhesive tape
  • Crosslinked polyolefin-based resin foam sheet and process for producing the same as well as adhesive tape

Examples

Experimental program
Comparison scheme
Effect test

examples 1 to 4

Comparative Example 4

[0090] An expandable polyolefin-based resin composition consisting of 100 parts by weight of linear low density polyethylene (made by Exxon Chemical Company, trade name: “EXACT3027”, density: 0.900 g / cm3, weight-average molecular weight: 2.0, melting point: 98° C., softening point: 85° C.) obtained using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst, 5 parts by weight of azodicarbonamide, 0.3 part by weight of 2,6-di-t-butyl-p-cresol and 1 part by weight of zinc oxide was fed to an extruder, melted and kneaded at 130° C., and extruded into a continuous expandable polyolefin-based resin sheet having a width of 200 mm and a thickness of 0.8 mm.

[0091] Then, both sides of the continuous expandable polyolefin-based resin foam sheet were irradiated with an electron beam of an acceleration voltage of 800 kV at 5 Mrad to crosslink the expandable polyolefin-based resin sheet, and this expandable polyolefin-based resin she...

example 5

[0094] According to the same procedure as that of Example 1 except that an amount of azodicarbonamide to be added was 3 parts by weight in place of 5 parts by weight, extrusion was performed so that a thickness of the expandable polyolefin-based resin sheet was 0.32 mm, and a ratio of a feeding speed and a winding speed (feeding rate / winding rate) of the foam sheet, as well as a width of CD in the crosslinked polyolefin-based resin foam sheet was 1050 mm, a crosslinked polyolefin-based resin foam sheet was obtained.

example 6

[0095] An expandable polyolefin-based resin composition consisting of 100 parts by weight of linear low density polyethylene (made by Exxon Chemical Company, trade name: “EXACT3027”, density: 0.900 g / cm3, weight-average molecular weight: 2.0, melting point: 98° C., softening point: 85° C.) obtained using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst, 5 parts by weight of azodicarbonamide, 0.3 part by weight of 2,6-di-t-butyl-p-cresol and 1 part by weight of zinc oxide was fed to an extruder, and melted and kneaded it at 130° C., which was extruded into a continuous expandable polyolefin-based resin sheet having a width of 200 mm and a thickness of 0.8 mm.

[0096] Then, both sides of the continuous expandable polyolefin-based resin sheet were irradiated with an electron beam of an acceleration voltage of 800 kV at 5 Mrad to crosslink the expandable polyolefin-based resin sheet, this expandable polyolefin-based resin sheet was continuousl...

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Abstract

The present invention provides a crosslinked polyolefin-based resin-extruded foam sheet capable of reducing its thickness while retaining excellent flexibility and heat resistance. The crosslinked polyolefin-based resin foam sheet of the present invention is obtained by feeding a polyolefin-based resin and a thermally degradable blowing agent to an extruder, melting and kneading them, extruding the kneaded material through the extruder into a sheet to form an expandable polyolefin-based resin sheet, and expanding the sheet. Herein, a degree of crosslinking of the crosslinked polyolefin-based resin foam sheet is 5 to 60% by weight, an aspect ratio of a cell (MD average cell diameter / CD average cell diameter) is 0.25 to 1, and the polyolefin-based resin contains 40% by weight or more of a polyethylene-based resin obtained using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst.

Description

TECHNICAL FIELD [0001] The present invention relates to a crosslinked polyolefin-based resin foam sheet having excellent flexibility and heat resistance and a process for producing the same, as well as an adhesive tape using the crosslinked polyolefin-based resin foam sheet. BACKGROUND ART [0002] Conventionally, polyolefin-based resin foam sheets have been used in a wide range of utility, and examples of this utility may include sealing materials for electronic appliances in addition to a base material of an adhesive tape and a base material of a patch. In these utilities, a polyolefin-based resin foam sheet is required to have a reduced thickness, and flexibility. [0003] As such a polyolefin-based resin foam sheet, Patent Document 1 has proposed a porous sheet with flexibility and mechanical strength improved by adding an inorganic filler to a polyolefin-based resin to form a sheet, and stretching this sheet to render it porous. [0004] However, since it is difficult to realize a hi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B5/00B29C65/00B29C48/305C08J9/06C08L23/00C09J5/08C09J7/20C09J7/26
CPCC08J9/06C08J2201/024C08J2201/03C08J2323/26Y10T428/268C09J7/0289C09J2423/00C09J7/02C08L23/00C09J7/20C09J7/26C08J9/103C08J2201/026C08J2323/06Y10T428/249953C09J2203/00C09J2301/40
Inventor TATEO, EIJISHIRAISHI, KOJI
Owner TATEO EIJI
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