Chemistry: natural resins or derivatives; peptides or proteins; – Natural resins or derivatives – Rosin or derivative used as starting material in process – or...
Patent
1995-01-18
1997-02-25
Nutter, Nathan M.
Chemistry: natural resins or derivatives; peptides or proteins;
Natural resins or derivatives
Rosin or derivative used as starting material in process, or...
530215, 530216, C08F 100, C08F 104, C08F 102
Patent
active
056060165
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a process for preparing colorless rosins which are colorless, odorless and excellent in heat stability and weatherability.
BACKGROUND ARTS
Conventionally, rosins and their derivatives, i.e., rosin esters are used as tackifiers for adhesives or pressure sensitive adhesives, modifiers for rubbers or plastics, resins for traffic paints, sizes for paper making, emulsifiers for synthetic rubbers, resin materials for inks and resins for paints, and the like. The above-mentioned rosin compounds are insufficient in views of their yellow or yellowish brown color, odor, and heat stability and weatherability (hereinafter both properties may be sometimes referred to as "stabilities").
In order to solve the defects of the rosin compounds, there have been commercially available, for example, disproportionated rosins which are improved in heat stability by disproportionation of raw rosins, hydrogenated rosins which are improved in the stabilities to a certain extent by hydrogenating raw rosins, or esterified rosins prepared by using the disproportionated rosins or the hydrogenated rosins. Those are, however, insufficient in views of color and stabilities.
There is described in JP-B-33771/1970 and JP-B-20599/1974 a process for disproportionation of rosins or rosin compounds with the particular organic sulfur compounds. The disproportionated rosins obtained according to that process are, however, insufficient in views of color, odor and stabilities.
As mentioned above, every conventional rosin, disproportionated rosin and hydrogenated rosin cannot simultaneously satisfy all the properties, i.e., color, odor and stabilities. Accordingly, it has been desired to produce colorless and odorless rosins having good stabilities.
An object of the present invention is, considering the above circumstances, to provide a novel process for producing colorless rosins which are improved in the properties of color, odor and stabilities of the conventional rosins.
DISCLOSURE OF THE INVENTION
As a result of studying to improve the above-mentioned properties in views of various conditions such as kind of rosins, purification operation and dehydrogenation reaction, a novel process for preparing colorless rosins which are in compliance with the object of the present invention, i.e., colorless, odorless and excellent in stabilities was found in which purified hydrogenated rosins are used as starting materials and are subjected to the specific reaction step, and then the present invention has been completed.
Namely, the present invention relates to a process for preparing colorless rosins characterized in that purified hydrogenated rosins are subjected to the specific reaction step, i.e., to dehydrogenation reaction in the presence of a dehydrogenating catalyst. According to the novel process, there can be provided the colorless rosins which are almost colorless in appearance, and have less odor at heating and are excellent in stabilities. The colorless rosins obtained by the process possess properties which are unexpected from the general concept derived from the conventional rosins. Namely, according to the present invention, the almost colorless rosins can be obtained, nevertheless there is the general concept that the appearance of rosins is yellow or yellowish brown. Further, the above-mentioned rosins can maintain good compatibility with various polymers which is the characteristic property of the conventional rosins.
PREFERRED EMBODIMENTS OF THE INVENTION
The starting materials of the present invention are the purified hydrogenated rosins. By using such rosins, the finally obtained rosins are made colorless, odorless and excellent in stabilities.
The purified hydrogenated rosins means ones obtained by partially or substantially completely hydrogenating gum rosins, wood rosins or tall oil rosins which contain mainly a resin acid such as abietic acids, palustric acids, neoabietic acids, pimaric acids, isopimaric acids and dehydroabietic acid and then purifying them (hereinafter refer
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Koba Yutaka
Maeda Masao
Yamada Yukiharu
Arakawa Kagaku Kogyo Kabushiki Kaisha
Nutter Nathan M.
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