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| Rivestar® is
the brand name for RIKEN TECHNOS film, whose main raw materials
are polyester
resins. |
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What are polyester resins? |
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They are macromolecules that have ester bonds:
esters polymerized from acid and alcohol. Based on their
uses, they can be divided into the following two types. |
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Saturated Polyesters
These resins soften when heated. Based on this property,
they can be used to make pliable products: ink, adhesives,
PET bottles, fiber, film, sheets. |
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Unsaturated Polyesters
These resins harden when heated. Based on this property,
they can be used to make highly heat-resistant products:
polyester plywood, artificial marble, baking paint. |
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Depending on their type and
method of processing, saturated polyester resins can
be given various characteristics, as indicated in the
table below. Rivestar® combines these saturated polyester
resins in various types of highly functional composite
film that effectively meet customer needs. |
|
 Table
1: Comparison of Characteristics of Saturated Polyester
Resins and Various Types of Film |
|
| Type |
Processing method |
Crystal state |
Physical properties |
Processability |
Safety, environmental characteristics |
| Surface hardness |
Impact resistance |
Heat resistance |
Transparency |
Formable in a vacuum |
Calories burned (kcal/kg) |
| A-PET |
Non-drawing |
Uncrystallized |
 |
|
 |
|
|
5,500 |
| O-PET |
Drawing |
Oriented crystals |
 |
|
|
|
 |
5,500 |
| C-PET |
Non-drawing |
Round crystals |
|
|
|
|
|
5,500 |
| PET G |
Non-drawing |
Completely noncrystal |
|
|
|
|
|
5,500 |
|
| Vinyl chloride |
Non-drawing |
Completely noncrystal |
|
|
|
|
|
4,500 |
| Olefin |
Non-drawing |
Round crystals |
|
|
|
|
|
10,500 |
| Paper, wood |
- |
- |
|
|
|
|
|
4,500 |
|
|
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In addition to these excellent
features: |
| |
 |
When saturated polyesters burn, they decompose into water
vapor and carbon dioxide; they do not produce dioxin, etc. |
| |
|
Their number of calories burned is low (about the same
as for paper and wood), so there is no cause for concern about damaging
incinerators. |
| |
|
They do not contain any “environmental hormones”: substances
suspected of disturbing internal secretions (substances specified by
the Environmental Agency in its “Environmental Hormone Strategy Plan
Speed ‘98 "). |
|
| Rivestar®is
“environmentally friendly film” that is gentle to the
earth’s environment and safe for people. |
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Suitability for Processing |
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Lamination - Wrapping - V Cut |
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Rivestar film can be laminated, wrapped or V-cut, and
doesn’t whiten. |
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3D Vacuum Formation |
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Like polyvinyl chloride film, Rivestar film can be formed
in a vacuum or with a membrane press. |
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Excellent Machinability |
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Being hard, polyester resin has excellent machinability.
No “machining chips” occur, so work can be done smoothly. |
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Laminating Without Priming |
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The surface of polyester resin film is highly wet, so
it need not be processed with primer. |
|
Sample
|
Polyvinyl chloride
|
Rivestar® Deep
|
| Subject |
BA-10 (2 liquids)
|
BA-10 (2 liquids)
|
Instantaneous
adhesion |
23ºC |
|
|
0ºC |
|
|
Anti-peeling strength
(N/25 mm) |
23ºC |
43
|
38
|
*Instantaneous adhesion:
Wood
failure rate: at least 90% Wood failure rate:
at least 50% Interface peeling |
|
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Repairable |
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Damage can be repaired without any special skill being
required. |
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Highly Suitable for Printing |
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Ink adheres superbly without corona processing. |
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Gentle to People and the Environment |
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Water + Carbon Dioxide |
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When Rivestar film burns, it decomposes into water vapor
and carbon dioxide; it does not produce dioxin, etc. |
|
Calories Burned |
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The number of calories burned is low, so there is no cause
for concern about damaging incinerators. |
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 |
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Food Sanitation Law |
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The saturated polyester resins in Rivestar film conforms
with the Ministry of Health and Welfare’s Notification No.
20: it is an extremely clean film. |
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Environmental Hormones |
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Rivestar film does not contain any “environmental hormones |
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*Substances suspected
of disturbing internal secretions (substances specified
by the Environmental Agency in its “Environmental Hormone
Strategy Plan Speed ‘98"). |
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Designability and Functionality |
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Freely Processable |
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With regard to such things as surface designability (color,
luster, etc.), surface hardness, and resistance to dirt,
Rivestar film offers the same suitability for printing and
the same surface performance as polyvinyl chloride (PVC)
film. Moreover, it can be heat-laminated. |
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The Possibilities Are Increasing |
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At present, in response to customer needs, we are providing
a wide variety of products. |
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|
 The above
values are representative values. They are not guaranteed values. |
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