Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Reexamination Certificate
2000-10-23
2002-11-26
Seidleck, James J. (Department: 1711)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
C428S332000, C428S353000, C428S354000
Reexamination Certificate
active
06485825
ABSTRACT:
FIELD OF THE INVENTION
The present invention is related to a pressure-sensitive adhesive tape or sheet which has superior conformability onto a substrate, easy-tear properties, and coloring properties.
BACKGROUND OF THE INVENTION
So called “vinyl” tape, which is prepared by laminating a pressure-sensitive adhesive layer on one side of a soft vinyl chloride resin base material, is superior in terms of flexibility, conformability onto a substrate, easy-tear properties, electric insulation, etc., and can easily be colored and weather-proofed as necessary, and therefore is widely used in applications such as electric insulation tapes, anticorrosion tapes, sealing tapes, marking sheets, etc.
Of these, marking sheets are widely used in sign boards, advertisement boards, shutters, and advertising stickers used on windows and such; ornamental stripe stickers used on automobiles, motor bikes, motor boats, snowmobiles, etc.; and display stickers used on traffic signs, directory boards, etc. Since conformability onto unevenness and curved surfaces of a substrate and lack of shrinking over time are required, the base material is prepared by adding a plasticizer, pigment and such to vinyl chloride resin, followed by molding with typically the calender method, and with the cast method for marking sheets and such which require superior quality in terms of weather resistance and strength (Japanese examined patent publication Tokko Hei 5-88862, for example).
However, since vinyl chloride resin contains chlorine, dioxine is produced when it is incinerated after use, resulting in environmental health problems. Therefore, a pressure-sensitive adhesive tape or sheet which uses resin containing no chlorine as the base material and yet possesses the same qualities as “vinyl” tapes is desired.
For example, Japanese unexamined patent publication Tokkai Hei 3-45672 discloses a marking film which uses polyurethane film as the base material. However, since the isocyanate component used in the aforementioned polyurethane film is diisocyanate with a short distance between isocyanate groups, such as tolylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, and hexamethylene diisocyanate, the flexibility was insufficient and the conformability onto unevenness and curved surfaces of a substrate was also insufficient.
Tokkai Hei 8-20750 discloses a marking film whose base material is a polypropylene-based resin with a weight average molecular weight of 80,000-500,000 for which, based on the cross fractionation method, the eluted amount for 0° C. or higher and 10° C. or lower is 45-80 wt % of the total resin amount, the eluted amount for temperatures higher than 10° C. and 70° C. or lower is 5-35 wt % of the total resin amount, the eluted amount for temperatures higher than 70° C. and 95° C. or lower is 1-30 wt % of the total resin amount, and the eluted amount for temperatures higher than 95° C. and 125° C. or lower is 3-35 wt % of the total resin amount. This polypropylene-based resin is too soft, does not provide glossy film, and the obtained film has the shortcoming of being difficult to cut. Also, its weather resistance is low; it can be used for only two years even when a stabilizer is added.
DISCLOSURE OF THE INVENTION
In view of the aforementioned shortcomings, the objective of the present invention is to provide a pressure-sensitive adhesive tape or sheet which is flexible, superior in terms of the conformability onto a substrate, and superior in easy-tear properties, as well as a method for manufacturing such tape or sheet.
Another objective is to provide a pressure-sensitive adhesive tape or sheet which is superior in terms of coloring properties, weather resistance and such, and can be used preferably as marking tapes or sheets, as well as a method for manufacturing such tape or sheet.
The first of the present invention is a pressure-sensitive adhesive tape or sheet prepared by laminating a pressure-sensitive adhesive layer onto one side of an urethane resin layer consisting of 100 weight parts of a polyol. component and A weight parts of a polyisocyanate component with a distance between cross-links (weight average molecular weight
umber of isocyanate groups) of 220-570, wherein the aforementioned A is represented by the following equation
A=100a
X/Y
(in this equation, a is a constant 0.067-0.135, X is the hydroxide value of the aforementioned polyol component, and Y is the weight percent concentration of isocyanate groups in the polyisocyanate component), and, at 5° C. and 35° C., the strength at a 2% elongation is 0.40-2.20 Kg/15 mm-width and the breaking elongation is 50-300%.
The second of the present invention is a pressure-sensitive adhesive tape or sheet prepared by laminating one after another a urethane resin layer consisting of 100 weight parts of a polyol component and A weight parts of a polyisocyanate component with a distance between cross-links (weight average molecular weight
umber of isocyanate groups) of 220-570, an olefin-based resin layer, and a pressure-sensitive adhesive layer, wherein the aforementioned A is represented by the following equation
A=100a
X/Y
(in this equation, a is a constant. 0.067-0.135, X is the hydroxide value of the aforementioned polyol component, and Y is the weight percent concentration of isocyanate groups in the polyisocyanate component), and, at 5° C. and 35° C., the strength at a 2% elongation is 0.40-2.20 Kg/15 mm-width and the breaking elongation is 50-300%.
The third of the present invention is a method of manufacturing the pressure-sensitive adhesive tape or sheet of the first of the present invention which comprises a process in which the first lamination is obtained by laminating a pressure-sensitive adhesive layer onto one side of the first release film, a process in which the second lamination is obtained by applying a reactive resin composition consisting of 100 weight parts of a polyol component and A weight parts of a polyisocyanate component with a distance between cross-links (weight average molecular weight
umber of isocyanate groups) of 220-570 and solvent onto the second release film, followed by drying, thus forming a urethane resin layer with a cross-link ratio of 20-93% on one side of the second release film, and a process in which the first lamination and the second lamination are laminated together in such a way that the pressure-sensitive adhesive layer of the first lamination and the urethane resin layer of the second lamination contact each other and the reaction of the urethane resin is completed, wherein the aforementioned A is represented by the following equation
A=100a
X/Y
(in this equation, a is a constant 0.067-0.135, X is the hydroxide value of the aforementioned polyol component, and Y is the weight percent concentration of isocyanate groups in the polyisocyanate component.)
The fourth of the present invention is a method of manufacturing the pressure-sensitive adhesive tape or sheet of the second of the present invention which comprises a process in which the first a lamination is obtained by laminating a pressure-sensitive adhesive layer and then the first release film onto an olefin-based resin layer, a process in which the second lamination is obtained by applying a reactive resin composition consisting of 100 weight parts of a polyol component and A weight parts of a polyisocyanate component with a distance between cross-links (weight average molecular weight
umber of isocyanate groups) of 220-570 and solvent onto the second release film, followed by drying, thus forming a urethane resin layer with a cross-link ratio of 20-93% on one side of the second release film, and a process in which the first lamination and the second lamination are laminated together in such a way that the olefin-based resin layer of the first lamination and the urethane resin layer of the second lamination contact each other and the reaction of the urethane resin is completed, wherein the aforementioned A is represented by the following equation
A=100a
X/Y
(in this equation, a is a
Heguri Masahiko
Miyake Yoshiyuki
Murayama Hiroshi
Ribar Travis B
Seidleck James J.
Sekisui Chemical Co. Ltd.
Townsend & Banta
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